fix: separate Ticket keys from assignment identity

chore: merge develop into hare/develop
fix: merge workdir registry cleanup
2026-08-29 22:52:03 +09:00 · 2026-08-29 13:25:32 +09:00 · 2026-08-29 13:21:40 +09:00 · 2026-08-29 13:21:35 +09:00 · 2026-08-28 02:05:12 +09:00 · 2026-08-28 00:05:00 +09:00
148 changed files with 20325 additions and 2823 deletions
@@ -26,6 +26,16 @@ dependencies = [
 "pom",
 ]

+[[package]]
+name = "aead"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
+dependencies = [
+ "crypto-common 0.1.7",
+ "generic-array",
+]
+
 [[package]]
 name = "aes"
 version = "0.8.4"
@@ -37,6 +47,20 @@ dependencies = [
 "cpufeatures 0.2.17",
 ]

+[[package]]
+name = "aes-gcm"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "831010a0f742e1209b3bcea8fab6a8e149051ba6099432c8cb2cc117dec3ead1"
+dependencies = [
+ "aead",
+ "aes",
+ "cipher",
+ "ctr",
+ "ghash",
+ "subtle",
+]
+
 [[package]]
 name = "agen"
 version = "0.2.1"
@@ -326,6 +350,12 @@ dependencies = [
 "tracing",
 ]

+[[package]]
+name = "base16ct"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c7f02d4ea65f2c1853089ffd8d2787bdbc63de2f0d29dedbcf8ccdfa0ccd4cf"
+
 [[package]]
 name = "base64"
 version = "0.21.7"
@@ -338,6 +368,12 @@ version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"

+[[package]]
+name = "base64ct"
+version = "1.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06"
+
 [[package]]
 name = "base64urlsafedata"
 version = "0.5.5"
@@ -349,6 +385,17 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "bcrypt-pbkdf"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6aeac2e1fe888769f34f05ac343bbef98b14d1ffb292ab69d4608b3abc86f2a2"
+dependencies = [
+ "blowfish",
+ "pbkdf2",
+ "sha2 0.10.9",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.5.3"
@@ -403,6 +450,16 @@ dependencies = [
 "generic-array",
 ]

+[[package]]
+name = "blowfish"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e412e2cd0f2b2d93e02543ceae7917b3c70331573df19ee046bcbc35e45e87d7"
+dependencies = [
+ "byteorder",
+ "cipher",
+]
+
 [[package]]
 name = "bstr"
 version = "1.12.1"
@@ -435,6 +492,12 @@ version = "1.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8efb64bd706a16a1bdde310ae86b351e4d21550d98d056f22f8a7f7a2183fec"

+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "bytes"
 version = "1.11.1"
@@ -495,6 +558,17 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"

+[[package]]
+name = "chacha20"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3613f74bd2eac03dad61bd53dbe620703d4371614fe0bc3b9f04dd36fe4e818"
+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures 0.2.17",
+]
+
 [[package]]
 name = "chrono"
 version = "0.4.44"
@@ -654,6 +728,12 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "const-oid"
+version = "0.9.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
+
 [[package]]
 name = "const-oid"
 version = "0.10.2"
@@ -937,6 +1017,18 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "460fbee9c2c2f33933d720630a6a0bac33ba7053db5344fac858d4b8952d77d5"

+[[package]]
+name = "crypto-bigint"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0dc92fb57ca44df6db8059111ab3af99a63d5d0f8375d9972e319a379c6bab76"
+dependencies = [
+ "generic-array",
+ "rand_core 0.6.4",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.7"
@@ -966,6 +1058,41 @@ dependencies = [
 "phf 0.11.3",
 ]

+[[package]]
+name = "ctr"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0369ee1ad671834580515889b80f2ea915f23b8be8d0daa4bbaf2ac5c7590835"
+dependencies = [
+ "cipher",
+]
+
+[[package]]
+name = "curve25519-dalek"
+version = "4.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97fb8b7c4503de7d6ae7b42ab72a5a59857b4c937ec27a3d4539dba95b5ab2be"
+dependencies = [
+ "cfg-if",
+ "cpufeatures 0.2.17",
+ "curve25519-dalek-derive",
+ "digest 0.10.7",
+ "fiat-crypto",
+ "rustc_version",
+ "subtle",
+]
+
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "darling"
 version = "0.23.0"
@@ -1056,6 +1183,16 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5729f5117e208430e437df2f4843f5e5952997175992d1414f94c57d61e270b4"

+[[package]]
+name = "der"
+version = "0.7.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7c1832837b905bbfb5101e07cc24c8deddf52f93225eee6ead5f4d63d53ddcb"
+dependencies = [
+ "const-oid 0.9.6",
+ "zeroize",
+]
+
 [[package]]
 name = "der-parser"
 version = "9.0.0"
@@ -1114,7 +1251,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
 "block-buffer 0.10.4",
+ "const-oid 0.9.6",
 "crypto-common 0.1.7",
+ "subtle",
 ]

 [[package]]
@@ -1124,7 +1263,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4850db49bf08e663084f7fb5c87d202ef91a3907271aff24a94eb97ff039153c"
 dependencies = [
 "block-buffer 0.12.0",
- "const-oid",
+ "const-oid 0.10.2",
 "crypto-common 0.2.1",
 ]

@@ -1175,12 +1314,66 @@ dependencies = [
 "cipher",
 ]

+[[package]]
+name = "ecdsa"
+version = "0.16.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee27f32b5c5292967d2d4a9d7f1e0b0aed2c15daded5a60300e4abb9d8020bca"
+dependencies = [
+ "der",
+ "digest 0.10.7",
+ "elliptic-curve",
+ "rfc6979",
+ "signature",
+ "spki",
+]
+
+[[package]]
+name = "ed25519"
+version = "2.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "115531babc129696a58c64a4fef0a8bf9e9698629fb97e9e40767d235cfbcd53"
+dependencies = [
+ "signature",
+]
+
+[[package]]
+name = "ed25519-dalek"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70e796c081cee67dc755e1a36a0a172b897fab85fc3f6bc48307991f64e4eca9"
+dependencies = [
+ "curve25519-dalek",
+ "ed25519",
+ "sha2 0.10.9",
+ "subtle",
+]
+
 [[package]]
 name = "either"
 version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"

+[[package]]
+name = "elliptic-curve"
+version = "0.13.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5e6043086bf7973472e0c7dff2142ea0b680d30e18d9cc40f267efbf222bd47"
+dependencies = [
+ "base16ct",
+ "crypto-bigint",
+ "digest 0.10.7",
+ "ff",
+ "generic-array",
+ "group",
+ "pkcs8",
+ "rand_core 0.6.4",
+ "sec1",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "embedded-io"
 version = "0.4.0"
@@ -1284,6 +1477,22 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"

+[[package]]
+name = "ff"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0b50bfb653653f9ca9095b427bed08ab8d75a137839d9ad64eb11810d5b6393"
+dependencies = [
+ "rand_core 0.6.4",
+ "subtle",
+]
+
+[[package]]
+name = "fiat-crypto"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28dea519a9695b9977216879a3ebfddf92f1c08c05d984f8996aecd6ecdc811d"
+
 [[package]]
 name = "filedescriptor"
 version = "0.8.3"
@@ -1526,6 +1735,7 @@ checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
 dependencies = [
 "typenum",
 "version_check",
+ "zeroize",
 ]

 [[package]]
@@ -1568,6 +1778,16 @@ dependencies = [
 "wasip3",
 ]

+[[package]]
+name = "ghash"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0d8a4362ccb29cb0b265253fb0a2728f592895ee6854fd9bc13f2ffda266ff1"
+dependencies = [
+ "opaque-debug",
+ "polyval",
+]
+
 [[package]]
 name = "gimli"
 version = "0.33.0"
@@ -1636,6 +1856,17 @@ dependencies = [
 "memmap2",
 ]

+[[package]]
+name = "group"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0f9ef7462f7c099f518d754361858f86d8a07af53ba9af0fe635bbccb151a63"
+dependencies = [
+ "ff",
+ "rand_core 0.6.4",
+ "subtle",
+]
+
 [[package]]
 name = "h2"
 version = "0.4.13"
@@ -1724,6 +1955,15 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"

+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest 0.10.7",
+]
+
 [[package]]
 name = "html5ever"
 version = "0.26.0"
@@ -2212,6 +2452,9 @@ name = "lazy_static"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+dependencies = [
+ "spin",
+]

 [[package]]
 name = "leb128fmt"
@@ -2672,6 +2915,22 @@ dependencies = [
 "num-traits",
 ]

+[[package]]
+name = "num-bigint-dig"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e661dda6640fad38e827a6d4a310ff4763082116fe217f279885c97f511bb0b7"
+dependencies = [
+ "lazy_static",
+ "libm",
+ "num-integer",
+ "num-iter",
+ "num-traits",
+ "rand 0.8.5",
+ "smallvec",
+ "zeroize",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.2.1"
@@ -2698,6 +2957,16 @@ dependencies = [
 "num-traits",
 ]

+[[package]]
+name = "num-iter"
+version = "0.1.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c92800bd69a1eac91786bcfe9da64a897eb72911b8dc3095decbd07429e8048b"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -2705,6 +2974,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
 dependencies = [
 "autocfg",
+ "libm",
 ]

 [[package]]
@@ -2765,6 +3035,12 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"

+[[package]]
+name = "opaque-debug"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08d65885ee38876c4f86fa503fb49d7b507c2b62552df7c70b2fce627e06381"
+
 [[package]]
 name = "openssl"
 version = "0.10.76"
@@ -2818,6 +3094,44 @@ dependencies = [
 "num-traits",
 ]

+[[package]]
+name = "p256"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2 0.10.9",
+]
+
+[[package]]
+name = "p384"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe42f1670a52a47d448f14b6a5c61dd78fce51856e68edaa38f7ae3a46b8d6b6"
+dependencies = [
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "sha2 0.10.9",
+]
+
+[[package]]
+name = "p521"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fc9e2161f1f215afdfce23677034ae137bbd45016a880c2eb3ba8eb95f085b2"
+dependencies = [
+ "base16ct",
+ "ecdsa",
+ "elliptic-curve",
+ "primeorder",
+ "rand_core 0.6.4",
+ "sha2 0.10.9",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.12.5"
@@ -2847,6 +3161,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "35fb2e5f958ec131621fdd531e9fc186ed768cbe395337403ae56c17a74c68ec"

+[[package]]
+name = "pbkdf2"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8ed6a7761f76e3b9f92dfb0a60a6a6477c61024b775147ff0973a02653abaf2"
+dependencies = [
+ "digest 0.10.7",
+]
+
 [[package]]
 name = "pdf-extract"
 version = "0.10.0"
@@ -2864,6 +3187,15 @@ dependencies = [
 "unicode-normalization",
 ]

+[[package]]
+name = "pem-rfc7468"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88b39c9bfcfc231068454382784bb460aae594343fb030d46e9f50a645418412"
+dependencies = [
+ "base64ct",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -3009,6 +3341,27 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a89322df9ebe1c1578d689c92318e070967d1042b512afbe49518723f4e6d5cd"

+[[package]]
+name = "pkcs1"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8ffb9f10fa047879315e6625af03c164b16962a5368d724ed16323b68ace47f"
+dependencies = [
+ "der",
+ "pkcs8",
+ "spki",
+]
+
+[[package]]
+name = "pkcs8"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f950b2377845cebe5cf8b5165cb3cc1a5e0fa5cfa3e1f7f55707d8fd82e0a7b7"
+dependencies = [
+ "der",
+ "spki",
+]
+
 [[package]]
 name = "pkg-config"
 version = "0.3.32"
@@ -3021,6 +3374,29 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"

+[[package]]
+name = "poly1305"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8159bd90725d2df49889a078b54f4f79e87f1f8a8444194cdca81d38f5393abf"
+dependencies = [
+ "cpufeatures 0.2.17",
+ "opaque-debug",
+ "universal-hash",
+]
+
+[[package]]
+name = "polyval"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d1fe60d06143b2430aa532c94cfe9e29783047f06c0d7fd359a9a51b729fa25"
+dependencies = [
+ "cfg-if",
+ "cpufeatures 0.2.17",
+ "opaque-debug",
+ "universal-hash",
+]
+
 [[package]]
 name = "pom"
 version = "1.1.0"
@@ -3101,6 +3477,15 @@ dependencies = [
 "syn 2.0.117",
 ]

+[[package]]
+name = "primeorder"
+version = "0.13.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "353e1ca18966c16d9deb1c69278edbc5f194139612772bd9537af60ac231e1e6"
+dependencies = [
+ "elliptic-curve",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -3525,6 +3910,16 @@ dependencies = [
 "web-sys",
 ]

+[[package]]
+name = "rfc6979"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8dd2a808d456c4a54e300a23e9f5a67e122c3024119acbfd73e3bf664491cb2"
+dependencies = [
+ "hmac",
+ "subtle",
+]
+
 [[package]]
 name = "ring"
 version = "0.17.14"
@@ -3539,6 +3934,27 @@ dependencies = [
 "windows-sys 0.52.0",
 ]

+[[package]]
+name = "rsa"
+version = "0.9.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8573f03f5883dcaebdfcf4725caa1ecb9c15b2ef50c43a07b816e06799bb12d"
+dependencies = [
+ "const-oid 0.9.6",
+ "digest 0.10.7",
+ "num-bigint-dig",
+ "num-integer",
+ "num-traits",
+ "pkcs1",
+ "pkcs8",
+ "rand_core 0.6.4",
+ "sha2 0.10.9",
+ "signature",
+ "spki",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "rusqlite"
 version = "0.37.0"
@@ -3745,6 +4161,20 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"

+[[package]]
+name = "sec1"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
+dependencies = [
+ "base16ct",
+ "der",
+ "generic-array",
+ "pkcs8",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "secrets"
 version = "0.1.0"
@@ -4060,6 +4490,16 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "signature"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
+dependencies = [
+ "digest 0.10.7",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "simd-adler32"
 version = "0.3.9"
@@ -4103,6 +4543,72 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "spin"
+version = "0.9.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3763264f6b73151db08c50ff20d7d8a0b8796e021cdea7ceedad07b80155fa0e"
+
+[[package]]
+name = "spki"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d91ed6c858b01f942cd56b37a94b3e0a1798290327d1236e4d9cf4eaca44d29d"
+dependencies = [
+ "base64ct",
+ "der",
+]
+
+[[package]]
+name = "ssh-cipher"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "caac132742f0d33c3af65bfcde7f6aa8f62f0e991d80db99149eb9d44708784f"
+dependencies = [
+ "aes",
+ "aes-gcm",
+ "cbc",
+ "chacha20",
+ "cipher",
+ "ctr",
+ "poly1305",
+ "ssh-encoding",
+ "subtle",
+]
+
+[[package]]
+name = "ssh-encoding"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb9242b9ef4108a78e8cd1a2c98e193ef372437f8c22be363075233321dd4a15"
+dependencies = [
+ "base64ct",
+ "pem-rfc7468",
+ "sha2 0.10.9",
+]
+
+[[package]]
+name = "ssh-key"
+version = "0.6.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b86f5297f0f04d08cabaa0f6bff7cb6aec4d9c3b49d87990d63da9d9156a8c3"
+dependencies = [
+ "bcrypt-pbkdf",
+ "ed25519-dalek",
+ "p256",
+ "p384",
+ "p521",
+ "rand_core 0.6.4",
+ "rsa",
+ "sec1",
+ "sha2 0.10.9",
+ "signature",
+ "ssh-cipher",
+ "ssh-encoding",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "stable_deref_trait"
 version = "1.2.1"
@@ -4934,6 +5440,16 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"

+[[package]]
+name = "universal-hash"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
+dependencies = [
+ "crypto-common 0.1.7",
+ "subtle",
+]
+
 [[package]]
 name = "unsafe-libyaml"
 version = "0.2.11"
@@ -6136,6 +6652,7 @@ dependencies = [
 "workdir",
 "worker",
 "workspace-api",
+ "zeroize",
 ]

 [[package]]
@@ -6259,11 +6776,13 @@ dependencies = [
 "project-record",
 "protocol",
 "reqwest",
+ "ring",
 "rusqlite",
 "serde",
 "serde_json",
 "serde_yaml",
 "sha2 0.11.0",
+ "ssh-key",
 "tempfile",
 "thiserror 2.0.18",
 "ticket",
@@ -6280,6 +6799,7 @@ dependencies = [
 "worker",
 "worker-runtime",
 "workspace-api",
+ "zeroize",
 ]

 [[package]]
@@ -115,6 +115,7 @@ tar = "0.4"
 rusqlite = { version = "0.37", features = ["backup", "bundled"] }
 ring = "0.17.14"
 sha2 = "0.11"
+ssh-key = { version = "0.6.7", features = ["ed25519", "encryption"] }
 tempfile = "3.27"
 thiserror = "2.0"
 tokio = "1.52"
@@ -124,4 +125,5 @@ toml = "1.1"
 tracing = "0.1"
 url = "2.5"
 uuid = "1.23"
+zeroize = "1"
 webauthn-rs = { version = "0.5.2", features = ["danger-allow-state-serialisation", "danger-credential-internals"] }
@@ -21,20 +21,21 @@ agen = { version = "0.2.1", features = ["codex"] }

 ## Quick start

-Supply an implementation of [`LlmClient`](https://docs.rs/agen/latest/agen/llm_client/trait.LlmClient.html), then run a turn. The first call consumes the mutable engine and returns a cache-locked engine for later turns.
+Supply an implementation of [`LlmClient`](https://docs.rs/agen/latest/agen/llm_client/trait.LlmClient.html), keep conversation history in your application, then run a turn. The first call consumes the mutable engine and returns a cache-locked engine for later turns.

 ```no_run
-use agen::{Engine, EngineError};
+use agen::{Engine, EngineError, History};
 use agen::llm_client::LlmClient;

 async fn conversation<C: LlmClient>(client: C) -> Result<(), EngineError> {
+    let mut history = History::new();
    let output = Engine::new(client)
        .system_prompt("You are a concise assistant.")
-        .run("Explain typed state in one sentence.")
-        .await?;
+        .run(&mut history, "Explain typed state in one sentence.")
+        .await;

    let mut engine = output.engine;
-    let _result = engine.run("Give a Rust example.").await?;
+    let _result = engine.run(&mut history, "Give a Rust example.").await;
    Ok(())
 }
 ```
@@ -4,7 +4,7 @@

 use agen::llm_client::scheme::{Scheme, anthropic::AnthropicScheme};
 use agen::llm_client::transport::{HttpTransport, ResolvedAuth};
-use agen::{Engine, EngineResult};
+use agen::{Engine, EngineRunExit, StopReason};
 use std::time::Duration;

 #[tokio::main]
@@ -29,6 +29,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let base_url = scheme.default_base_url().to_string();
    let client = HttpTransport::new(scheme, model, base_url, ResolvedAuth::ApiKey(api_key), cap);
    let engine = Engine::new(client);
+    let mut history = agen::History::new();

    println!("🚀 Starting Engine...");
    println!("💡 Will cancel after 2 seconds\n");
@@ -45,16 +46,15 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {

    println!("📡 Sending request to LLM...");

-    match engine.run("Tell me a very long story about a brave knight. Make it as detailed as possible with many paragraphs.").await {
-        Ok(out) => match out.result {
-            EngineResult::Finished => println!("✅ Task completed normally"),
-            EngineResult::Paused => println!("⏸️  Task paused"),
-            EngineResult::LimitReached => println!("🔒 Turn limit reached"),
-            EngineResult::Yielded => println!("↩️  Task yielded"),
-        },
-        Err(e) => {
-            println!("❌ Task error: {}", e);
+    let output = engine.run(&mut history, "Tell me a very long story about a brave knight. Make it as detailed as possible with many paragraphs.").await;
+    match output.result {
+        EngineRunExit::Finished => println!("✅ Task completed normally"),
+        EngineRunExit::Paused => println!("⏸️  Task paused"),
+        EngineRunExit::Yielded => println!("↩️  Task yielded"),
+        EngineRunExit::Interrupted(StopReason::LimitReached) => {
+            println!("🔒 Turn limit reached")
        }
+        EngineRunExit::Interrupted(reason) => println!("❌ Task interrupted: {reason:?}"),
    }

    println!("\n✨ Demo complete!");
@@ -39,7 +39,7 @@ use tracing::info;
 use tracing_subscriber::EnvFilter;

 use agen::{
-    Engine,
+    Engine, EngineRunExit, StopReason,
    interceptor::{Interceptor, PostToolAction, ToolResultInfo},
    llm_client::{
        LlmClient,
@@ -451,6 +451,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {

    // Create Engine
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    let tool_call_names = Arc::new(Mutex::new(HashMap::new()));

@@ -476,12 +477,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {

    // One-shot mode
    if let Some(prompt) = args.prompt {
-        match engine.run(&prompt).await {
-            Ok(_) => {}
-            Err(e) => {
-                eprintln!("\n❌ Error: {}", e);
-                std::process::exit(1);
-            }
+        let output = engine.run(&mut history, &prompt).await;
+        if let EngineRunExit::Interrupted(StopReason::Unexpected(error)) = output.result {
+            eprintln!("\n❌ Error: {error}");
        }

        return Ok(());
@@ -500,13 +498,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
        return Ok(());
    }

-    let mut locked = match engine.run(first_input).await {
-        Ok(out) => out.engine,
-        Err(e) => {
-            eprintln!("\n❌ Error: {}", e);
-            return Ok(());
-        }
-    };
+    let output = engine.run(&mut history, first_input).await;
+    let mut locked = output.engine;

    loop {
        print!("\n👤 You: ");
@@ -525,11 +518,10 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
            break;
        }

-        match locked.run(input).await {
-            Ok(_) => {}
-            Err(e) => {
-                eprintln!("\n❌ Error: {}", e);
-            }
+        if let EngineRunExit::Interrupted(StopReason::Unexpected(error)) =
+            locked.run(&mut history, input).await
+        {
+            eprintln!("\n❌ Error: {error}");
        }
    }

@@ -0,0 +1,199 @@
+//! Typed conversation history containers.
+//!
+//! Agen keeps provider-visible [`Item`](crate::Item) values separate from any
+//! host-domain provenance. The host chooses the annotation type `A`, while Agen
+//! preserves each item and annotation as one entry for clone/truncate/restore
+//! style history operations.
+
+use serde::{Deserialize, Serialize};
+
+use crate::Item;
+
+/// One conversation-history entry with host-owned annotation.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct HistoryEntry<A = ()> {
+    /// Provider/model-visible conversation item.
+    pub item: Item,
+    /// Host-domain metadata kept with the item and never projected to providers.
+    pub annotation: A,
+}
+
+impl<A> HistoryEntry<A> {
+    /// Build an entry from an item and its annotation.
+    pub fn new(item: Item, annotation: A) -> Self {
+        Self { item, annotation }
+    }
+
+    /// Split the entry into its item and annotation.
+    pub fn into_parts(self) -> (Item, A) {
+        (self.item, self.annotation)
+    }
+}
+
+impl HistoryEntry<()> {
+    /// Build a unit-annotated entry.
+    pub fn from_item(item: Item) -> Self {
+        Self {
+            item,
+            annotation: (),
+        }
+    }
+}
+
+/// Conversation history with one annotation per item.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Default)]
+pub struct History<A = ()> {
+    entries: Vec<HistoryEntry<A>>,
+}
+
+impl<A> History<A> {
+    /// Create an empty history.
+    pub fn new() -> Self {
+        Self {
+            entries: Vec::new(),
+        }
+    }
+
+    /// Build history from already annotated entries, preserving order.
+    pub fn from_entries(entries: Vec<HistoryEntry<A>>) -> Self {
+        Self { entries }
+    }
+
+    /// Replace all entries as one restore/rebuild operation and return the old entries.
+    pub fn replace_entries(&mut self, entries: Vec<HistoryEntry<A>>) -> Vec<HistoryEntry<A>> {
+        std::mem::replace(&mut self.entries, entries)
+    }
+
+    /// Borrow annotated entries.
+    pub fn entries(&self) -> &[HistoryEntry<A>] {
+        &self.entries
+    }
+
+    /// Mutably borrow annotated entries for host-owned rebuild operations.
+    pub fn entries_mut(&mut self) -> &mut [HistoryEntry<A>] {
+        &mut self.entries
+    }
+
+    /// Consume the history into annotated entries.
+    pub fn into_entries(self) -> Vec<HistoryEntry<A>> {
+        self.entries
+    }
+
+    /// Number of entries.
+    pub fn len(&self) -> usize {
+        self.entries.len()
+    }
+
+    /// Whether the history is empty.
+    pub fn is_empty(&self) -> bool {
+        self.entries.is_empty()
+    }
+
+    /// Iterate over annotated entries.
+    pub fn iter(&self) -> impl ExactSizeIterator<Item = &HistoryEntry<A>> {
+        self.entries.iter()
+    }
+
+    /// Iterate over provider-visible items only.
+    pub fn items(&self) -> impl ExactSizeIterator<Item = &Item> {
+        self.entries.iter().map(|entry| &entry.item)
+    }
+
+    /// Clone provider-visible items into a request-local projection.
+    pub fn items_cloned(&self) -> Vec<Item> {
+        self.items().cloned().collect()
+    }
+
+    /// Append an already annotated entry.
+    pub fn push_entry(&mut self, entry: HistoryEntry<A>) {
+        self.entries.push(entry);
+    }
+
+    /// Append many already annotated entries.
+    pub fn extend_entries(&mut self, entries: impl IntoIterator<Item = HistoryEntry<A>>) {
+        self.entries.extend(entries);
+    }
+
+    /// Commit one item through a trusted annotation callback before it becomes live.
+    ///
+    /// The callback may durably persist the item and returns the annotation that
+    /// must be stored with it. If the callback fails, the history is left unchanged.
+    pub fn append_with(
+        &mut self,
+        item: Item,
+        annotate: &mut impl FnMut(&Item) -> Result<A, String>,
+    ) -> Result<(), String> {
+        let annotation = annotate(&item)?;
+        self.entries.push(HistoryEntry { item, annotation });
+        Ok(())
+    }
+
+    /// Commit items through a trusted annotation callback before they become live.
+    ///
+    /// Items before a failure remain appended; the failing item and later items do
+    /// not enter history. This mirrors append-only durable logs where each accepted
+    /// item is already committed before the next item is attempted.
+    pub fn extend_with(
+        &mut self,
+        items: impl IntoIterator<Item = Item>,
+        annotate: &mut impl FnMut(&Item) -> Result<A, String>,
+    ) -> Result<(), String> {
+        for item in items {
+            self.append_with(item, annotate)?;
+        }
+        Ok(())
+    }
+
+    /// Truncate entries, preserving item+annotation pairing for retained entries.
+    pub fn truncate(&mut self, len: usize) {
+        self.entries.truncate(len);
+    }
+
+    /// Clear all entries.
+    pub fn clear(&mut self) {
+        self.entries.clear();
+    }
+}
+
+impl History<()> {
+    /// Build unit-annotated history from provider-visible items.
+    pub fn from_items(items: Vec<Item>) -> Self {
+        Self {
+            entries: items.into_iter().map(HistoryEntry::from_item).collect(),
+        }
+    }
+
+    /// Replace history from provider-visible items using unit annotations.
+    pub fn replace_items(&mut self, items: Vec<Item>) -> Vec<HistoryEntry<()>> {
+        self.replace_entries(items.into_iter().map(HistoryEntry::from_item).collect())
+    }
+
+    /// Append one item with unit annotation.
+    pub fn push(&mut self, item: Item) {
+        self.entries.push(HistoryEntry::from_item(item));
+    }
+
+    /// Append items with unit annotations.
+    pub fn extend_items(&mut self, items: impl IntoIterator<Item = Item>) {
+        self.entries
+            .extend(items.into_iter().map(HistoryEntry::from_item));
+    }
+}
+
+impl<A> IntoIterator for History<A> {
+    type Item = HistoryEntry<A>;
+    type IntoIter = std::vec::IntoIter<HistoryEntry<A>>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.entries.into_iter()
+    }
+}
+
+impl<'a, A> IntoIterator for &'a History<A> {
+    type Item = &'a HistoryEntry<A>;
+    type IntoIter = std::slice::Iter<'a, HistoryEntry<A>>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.entries.iter()
+    }
+}
@@ -2,6 +2,7 @@

 mod engine;
 mod handler;
+mod history;
 mod message;

 pub(crate) mod callback;
@@ -20,13 +21,18 @@ pub mod usage_record;
 pub use agen_macros::{description, tool, tool_registry};
 pub use callback::{TextBlockScope, ThinkingBlockScope, ToolUseBlockScope};
 pub use engine::{
-    Engine, EngineConfig, EngineError, EngineResult, EngineRunOutput, LlmRetryNotice,
-    ToolRegistryError,
+    Engine, EngineConfig, EngineError, EngineResult, EngineRunExit, EngineRunOutput,
+    LlmRetryNotice, StopReason, ToolRegistryError,
 };
 pub use handler::ToolUseBlockStart;
+pub use history::{History, HistoryEntry};
 pub use interceptor::Interceptor;
 pub use message::{ContentPart, Item, Message, Role};
-pub use tool::{ToolCall, ToolExecutionContext, ToolOutputLimits, ToolResult};
+pub use tool::{
+    ToolCall, ToolExecutionContext, ToolExecutionHandle, ToolExecutionPolicy,
+    ToolExecutionTerminal, ToolExecutionTerminalFuture, ToolOutputLimits, ToolResult,
+    ToolResultDisposition,
+};
 pub use usage_record::UsageRecord;

 /// Implementation dependencies used by code generated from `agen` macros.
@@ -18,6 +18,9 @@ pub enum ClientError {
        message: String,
        retry_after: Option<Duration>,
    },
+    /// The provider rejected the request because it exceeded the model context window.
+    /// Classified only from a structured provider error code, never message text.
+    ContextWindowExceeded,
    /// A request lifecycle phase exceeded its hard timeout.
    Timeout {
        phase: &'static str,
@@ -48,6 +51,7 @@ impl fmt::Display for ClientError {
                }
                write!(f, ": {}", message)
            }
+            ClientError::ContextWindowExceeded => write!(f, "Model context window reached"),
            ClientError::Timeout { phase, timeout } => {
                write!(f, "{phase} timed out after {}s", timeout.as_secs())
            }
@@ -112,7 +116,10 @@ pub fn is_retryable(error: &ClientError) -> bool {
        ClientError::Api { status: None, .. } => false,
        ClientError::Timeout { .. } => true,
        ClientError::Http(e) => e.is_connect() || e.is_timeout(),
-        ClientError::Json(_) | ClientError::Sse(_) | ClientError::Config(_) => false,
+        ClientError::ContextWindowExceeded
+        | ClientError::Json(_)
+        | ClientError::Sse(_)
+        | ClientError::Config(_) => false,
    }
 }

@@ -431,13 +431,7 @@ fn api_error_code(error: &ClientError) -> Option<&str> {
 }

 fn is_context_length_exceeded(error: &ClientError) -> bool {
-    match error {
-        ClientError::Api { code, message, .. } => {
-            code.as_deref() == Some("context_length_exceeded")
-                || message.contains("context_length_exceeded")
-        }
-        _ => false,
-    }
+    matches!(error, ClientError::ContextWindowExceeded)
 }

 async fn response_with_timeout(
@@ -487,6 +481,9 @@ async fn classify_error_response(resp: reqwest::Response) -> ClientError {
            .and_then(|v| v.as_str())
            .unwrap_or(&text)
            .to_string();
+        if code.as_deref() == Some("context_length_exceeded") {
+            return ClientError::ContextWindowExceeded;
+        }
        ClientError::Api {
            status: Some(status),
            code,
@@ -9,7 +9,7 @@

 use std::{fmt, sync::Arc};

-use crate::tool::Attachment;
+use crate::tool::{Attachment, ToolResultDisposition};
 use base64::Engine as _;
 use serde::{Deserialize, Serialize};

@@ -121,6 +121,9 @@ pub enum Item {
        /// Detailed output (removed by pruning when old enough)
        #[serde(default, skip_serializing_if = "Option::is_none")]
        content: Option<String>,
+        /// Typed terminal state used for replay and recovery.
+        #[serde(default, skip_serializing_if = "ToolResultDisposition::is_success")]
+        disposition: ToolResultDisposition,
        /// Whether the tool result represents an execution error.
        #[serde(default, skip_serializing_if = "is_false")]
        is_error: bool,
@@ -261,7 +264,17 @@ impl Item {
        content: Option<String>,
        is_error: bool,
    ) -> Self {
-        Self::tool_result_item_with_attachments(call_id, summary, content, is_error, Vec::new())
+        Self::tool_result_item_with_disposition_and_attachments(
+            call_id,
+            summary,
+            content,
+            if is_error {
+                ToolResultDisposition::Error
+            } else {
+                ToolResultDisposition::Success
+            },
+            Vec::new(),
+        )
    }

    /// Create a tool result item with durable, prunable structured attachments.
@@ -272,11 +285,33 @@ impl Item {
        is_error: bool,
        attachments: Vec<Attachment>,
    ) -> Self {
+        Self::tool_result_item_with_disposition_and_attachments(
+            call_id,
+            summary,
+            content,
+            if is_error {
+                ToolResultDisposition::Error
+            } else {
+                ToolResultDisposition::Success
+            },
+            attachments,
+        )
+    }
+
+    pub fn tool_result_item_with_disposition_and_attachments(
+        call_id: impl Into<String>,
+        summary: impl Into<String>,
+        content: Option<String>,
+        disposition: ToolResultDisposition,
+        attachments: Vec<Attachment>,
+    ) -> Self {
+        let is_error = !disposition.is_success();
        Self::ToolResult {
            id: None,
            call_id: call_id.into(),
            summary: summary.into(),
            content,
+            disposition,
            is_error,
            attachments,
        }
@@ -19,7 +19,7 @@ mod private {
 /// - Editing message history (add, delete, clear)
 /// - Registering tools and hooks
 ///
-/// Can transition to [`Locked`] state via `Engine::lock()`.
+/// Can transition to [`Locked`] state via `Engine::lock(&history)`.
 ///
 /// # Examples
 ///
@@ -3,7 +3,14 @@
 //! Traits for defining tools callable by LLM.
 //! Usually auto-implemented using the `#[tool]` macro.

-use std::{collections::HashMap, fmt, sync::Arc};
+use std::{
+    collections::HashMap,
+    fmt,
+    future::Future,
+    pin::Pin,
+    sync::Arc,
+    task::{Context, Poll},
+};

 use async_trait::async_trait;
 use base64::{Engine as _, engine::general_purpose::STANDARD};
@@ -23,6 +30,12 @@ pub enum ToolError {
    /// Internal error
    #[error("Internal error: {0}")]
    Internal(String),
+    /// Cooperative cancellation completed with bounded terminal output.
+    #[error("Tool execution cancelled")]
+    Cancelled(ToolOutput),
+    /// Execution was interrupted with a confirmed bounded terminal output.
+    #[error("Tool execution interrupted")]
+    Interrupted(ToolOutput),
 }

 // =============================================================================
@@ -158,6 +171,28 @@ pub enum Attachment {
    Image(ImageAttachment),
 }

+/// Terminal disposition of one started tool call.
+///
+/// `Cancelled` means the tool confirmed cancellation. `OutcomeUnknown` means
+/// execution stopped without confirmation, so neither completion nor side
+/// effects may be inferred.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum ToolResultDisposition {
+    #[default]
+    Success,
+    Error,
+    Interrupted,
+    Cancelled,
+    OutcomeUnknown,
+}
+
+impl ToolResultDisposition {
+    pub const fn is_success(&self) -> bool {
+        matches!(self, Self::Success)
+    }
+}
+
 /// Tool execution result.
 ///
 /// Every output has a mandatory `summary` (1-2 lines) that persists in
@@ -322,6 +357,12 @@ impl ToolExecutionContext {
        }
    }

+    /// Identifies one live execution attempt without making the batch id a durable
+    /// replay or idempotency authority.
+    pub fn execution_id(&self) -> String {
+        format!("{}:{}", self.batch_id, self.call_id)
+    }
+
    /// Context for direct, non-engine calls in unit tests and low-level callers.
    pub fn direct() -> Self {
        Self::new("direct", "direct", 0)
@@ -334,6 +375,142 @@ impl Default for ToolExecutionContext {
    }
 }

+/// The provider-confirmed terminal result of one started tool execution.
+///
+/// `OutcomeUnknown` is reserved for an execution task that had to be force-closed
+/// or failed before the provider could confirm its terminal result.
+#[derive(Debug)]
+pub enum ToolExecutionTerminal {
+    Confirmed(Result<ToolOutput, ToolError>),
+    OutcomeUnknown,
+}
+
+/// The completion future paired with a [`ToolExecutionHandle`]. Dropping this
+/// future does not drop the provider execution: the spawned execution remains
+/// owned by its handle until it completes or is explicitly force-closed.
+pub struct ToolExecutionTerminalFuture {
+    task: tokio::task::JoinHandle<Result<ToolOutput, ToolError>>,
+}
+
+impl Future for ToolExecutionTerminalFuture {
+    type Output = ToolExecutionTerminal;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        match Pin::new(&mut self.task).poll(cx) {
+            Poll::Ready(Ok(result)) => Poll::Ready(ToolExecutionTerminal::Confirmed(result)),
+            Poll::Ready(Err(_)) => Poll::Ready(ToolExecutionTerminal::OutcomeUnknown),
+            Poll::Pending => Poll::Pending,
+        }
+    }
+}
+
+/// Live ownership and control for one started tool execution.
+///
+/// Execution, cancellation, and terminal confirmation remain provider-owned:
+/// this handle starts `Tool::execute`, delegates cooperative cancellation to
+/// `Tool::cancel_execution`, and treats execution-future completion as the
+/// provider's terminal confirmation. Agen may force-close only after its caller's
+/// deadline expires, at which point the outcome is necessarily unknown.
+#[derive(Clone)]
+pub struct ToolExecutionHandle {
+    inner: Arc<ToolExecutionHandleInner>,
+}
+
+struct ToolExecutionHandleInner {
+    tool: Arc<dyn Tool>,
+    context: ToolExecutionContext,
+    abort: tokio::task::AbortHandle,
+}
+
+impl Drop for ToolExecutionHandleInner {
+    fn drop(&mut self) {
+        // Losing the final live owner is an explicit forced close, never a
+        // best-effort detached provider future.
+        self.abort.abort();
+    }
+}
+
+impl fmt::Debug for ToolExecutionHandle {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("ToolExecutionHandle")
+            .field("call_id", &self.inner.context.call_id)
+            .field("batch_id", &self.inner.context.batch_id)
+            .finish_non_exhaustive()
+    }
+}
+
+impl ToolExecutionHandle {
+    pub fn start(
+        tool: Arc<dyn Tool>,
+        input_json: String,
+        context: ToolExecutionContext,
+    ) -> (Self, ToolExecutionTerminalFuture) {
+        let execution_tool = Arc::clone(&tool);
+        let execution_context = context.clone();
+        let task =
+            tokio::spawn(
+                async move { execution_tool.execute(&input_json, execution_context).await },
+            );
+        let abort = task.abort_handle();
+        (
+            Self {
+                inner: Arc::new(ToolExecutionHandleInner {
+                    tool,
+                    context,
+                    abort,
+                }),
+            },
+            ToolExecutionTerminalFuture { task },
+        )
+    }
+
+    pub fn context(&self) -> &ToolExecutionContext {
+        &self.inner.context
+    }
+
+    pub async fn cancel_before(&self, deadline: tokio::time::Instant) -> Result<(), ToolError> {
+        match tokio::time::timeout_at(
+            deadline,
+            self.inner.tool.cancel_execution(&self.inner.context),
+        )
+        .await
+        {
+            Ok(result) => result,
+            Err(_) => Err(ToolError::Internal(format!(
+                "tool cancellation request exceeded its deadline for call {}",
+                self.inner.context.call_id
+            ))),
+        }
+    }
+
+    pub fn force_close(&self) {
+        self.inner.abort.abort();
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct ToolExecutionPolicy {
+    /// Time a pause waits for already-started providers to reach a natural safe
+    /// boundary before escalating to explicit cooperative cancellation.
+    pub pause_safe_boundary_timeout: std::time::Duration,
+    /// Maximum time allowed for a provider to accept one cooperative
+    /// cancellation request.
+    pub cancellation_request_timeout: std::time::Duration,
+    /// Maximum time allowed for all providers to confirm terminal results after
+    /// cancellation has been requested.
+    pub terminal_confirmation_timeout: std::time::Duration,
+}
+
+impl Default for ToolExecutionPolicy {
+    fn default() -> Self {
+        Self {
+            pause_safe_boundary_timeout: std::time::Duration::from_millis(100),
+            cancellation_request_timeout: std::time::Duration::from_millis(100),
+            terminal_confirmation_timeout: std::time::Duration::from_millis(500),
+        }
+    }
+}
+
 // =============================================================================
 // Tool trait
 // =============================================================================
@@ -402,6 +579,26 @@ pub trait Tool: Send + Sync {
        input_json: &str,
        ctx: ToolExecutionContext,
    ) -> Result<ToolOutput, ToolError>;
+
+    /// Request cooperative cancellation for one started call.
+    ///
+    /// Implementations that own cancellable provider operations should signal
+    /// every live execution identified by `call_id`, then let `execute` return
+    /// the confirmed bounded terminal output. Direct callers may use this
+    /// compatibility surface; Agen uses [`Tool::cancel_execution`] so providers
+    /// can bind cancellation to one exact live attempt.
+    async fn cancel(&self, _call_id: &str) -> Result<(), ToolError> {
+        Ok(())
+    }
+
+    /// Request cooperative cancellation for one exact started execution.
+    ///
+    /// The default preserves existing tools by delegating to `cancel(call_id)`.
+    /// Providers with their own execution registry should override this method
+    /// and key cancellation by [`ToolExecutionContext::execution_id`].
+    async fn cancel_execution(&self, ctx: &ToolExecutionContext) -> Result<(), ToolError> {
+        self.cancel(&ctx.call_id).await
+    }
 }

 // =============================================================================
@@ -429,6 +626,9 @@ pub struct ToolCall {
 pub struct ToolResult {
    /// Corresponding tool call ID
    pub tool_use_id: String,
+    /// Typed terminal state.
+    #[serde(default, skip_serializing_if = "ToolResultDisposition::is_success")]
+    pub disposition: ToolResultDisposition,
    /// Short summary (always kept in history)
    pub summary: String,
    /// Detailed output (prunable)
@@ -445,11 +645,20 @@ pub struct ToolResult {
 impl ToolResult {
    /// Create a success result from a [`ToolOutput`].
    pub fn from_output(tool_use_id: impl Into<String>, output: ToolOutput) -> Self {
+        Self::from_output_with_disposition(tool_use_id, output, ToolResultDisposition::Success)
+    }
+
+    pub fn from_output_with_disposition(
+        tool_use_id: impl Into<String>,
+        output: ToolOutput,
+        disposition: ToolResultDisposition,
+    ) -> Self {
        Self {
            tool_use_id: tool_use_id.into(),
+            disposition,
            summary: output.summary,
            content: output.content,
-            is_error: false,
+            is_error: !disposition.is_success(),
            attachments: output.attachments,
        }
    }
@@ -458,12 +667,28 @@ impl ToolResult {
    pub fn error(tool_use_id: impl Into<String>, message: impl Into<String>) -> Self {
        Self {
            tool_use_id: tool_use_id.into(),
+            disposition: ToolResultDisposition::Error,
            summary: message.into(),
            content: None,
            is_error: true,
            attachments: Vec::new(),
        }
    }
+
+    /// Close an execution whose completion and side effects cannot be confirmed.
+    pub fn outcome_unknown(tool_use_id: impl Into<String>) -> Self {
+        Self {
+            tool_use_id: tool_use_id.into(),
+            disposition: ToolResultDisposition::OutcomeUnknown,
+            summary: "Tool execution outcome unknown".to_string(),
+            content: Some(
+                "Execution was interrupted before completion could be confirmed. Completion and side effects are unknown."
+                    .to_string(),
+            ),
+            is_error: true,
+            attachments: Vec::new(),
+        }
+    }
 }

 #[cfg(test)]
@@ -0,0 +1,84 @@
+mod common;
+
+use agen::llm_client::event::{Event, ResponseStatus, StatusEvent};
+use agen::{Engine, EngineError, History, HistoryEntry, Item, Role};
+use common::MockLlmClient;
+
+fn completed_text_events(text: &str) -> Vec<Event> {
+    vec![
+        Event::text_block_start(0),
+        Event::text_delta(0, text),
+        Event::text_block_stop(0, None),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]
+}
+
+#[tokio::test]
+async fn run_preserves_item_annotations_without_projecting_them() {
+    let client = MockLlmClient::new(completed_text_events("assistant reply"));
+    let engine = Engine::<_, agen::state::Mutable, String>::new_annotated(client);
+    let mut history = History::<String>::new();
+    let mut next = 0usize;
+    let mut annotate = |item: &Item| {
+        next += 1;
+        let kind = match item {
+            Item::Message { role, .. } => match role {
+                Role::User => "user",
+                Role::Assistant => "assistant",
+                Role::System => "system",
+            },
+            Item::ToolCall { .. } => "tool_call",
+            Item::ToolResult { .. } => "tool_result",
+            Item::Reasoning { .. } => "reasoning",
+        };
+        Ok(format!("{next}:{kind}"))
+    };
+
+    let output = engine
+        .run_with_annotation(&mut history, "hello", &mut annotate)
+        .await;
+
+    assert!(matches!(output.result, agen::EngineRunExit::Finished));
+    assert_eq!(history.len(), 2);
+    assert_eq!(history.entries()[0].annotation, "1:user");
+    assert_eq!(history.entries()[1].annotation, "2:assistant");
+    assert_eq!(history.items_cloned().len(), 2);
+}
+
+#[test]
+fn append_failure_does_not_make_item_live() {
+    let client = MockLlmClient::new(vec![]);
+    let mut engine = Engine::<_, agen::state::Mutable, usize>::new_annotated(client);
+    let mut history = History::<usize>::new();
+    let mut fail = |_item: &Item| Err("commit failed".to_string());
+
+    let err = engine
+        .append_history_with(&mut history, [Item::user_message("uncommitted")], &mut fail)
+        .unwrap_err();
+
+    assert!(matches!(err, EngineError::HistoryAppend(message) if message == "commit failed"));
+    assert!(history.is_empty());
+}
+
+#[test]
+fn replacement_keeps_items_and_annotations_together() {
+    let mut history = History::from_entries(vec![
+        HistoryEntry::new(Item::user_message("old"), "old-ann".to_string()),
+        HistoryEntry::new(Item::user_message("second"), "second-ann".to_string()),
+    ]);
+
+    history.truncate(1);
+    assert_eq!(history.entries()[0].item.as_text(), Some("old"));
+    assert_eq!(history.entries()[0].annotation, "old-ann");
+
+    let previous = history.replace_entries(vec![HistoryEntry::new(
+        Item::user_message("restored"),
+        "restored-ann".to_string(),
+    )]);
+
+    assert_eq!(previous.len(), 1);
+    assert_eq!(history.entries()[0].item.as_text(), Some("restored"));
+    assert_eq!(history.entries()[0].annotation, "restored-ann");
+}
@@ -58,6 +58,7 @@ async fn test_callback_llm_retry_event() {
        max_attempts: 2,
        total_timeout: Duration::from_secs(1),
    });
+    let mut history = agen::History::new();

    let notices = Arc::new(Mutex::new(Vec::new()));
    let sink = notices.clone();
@@ -65,8 +66,11 @@ async fn test_callback_llm_retry_event() {
        sink.lock().unwrap().push((llm_call, notice.clone()));
    });

-    let result = engine.run("retry once").await;
-    assert!(result.is_ok(), "engine should succeed after one retry");
+    let result = engine.run(&mut history, "retry once").await;
+    assert!(
+        matches!(result.result, agen::EngineRunExit::Finished),
+        "engine should succeed after one retry"
+    );

    let notices = notices.lock().unwrap();
    assert_eq!(notices.len(), 1);
@@ -91,6 +95,7 @@ async fn test_callback_text_block_events() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    let text_deltas = Arc::new(Mutex::new(Vec::new()));
    let text_completes = Arc::new(Mutex::new(Vec::new()));
@@ -108,9 +113,12 @@ async fn test_callback_text_block_events() {
        });
    });

-    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let result = engine.run("Greet me").await;
-    assert!(result.is_ok(), "Engine should complete");
+    // Mutable::run consumes self, returns (Locked, EngineRunExit)
+    let result = engine.run(&mut history, "Greet me").await;
+    assert!(
+        matches!(result.result, agen::EngineRunExit::Finished),
+        "Engine should complete"
+    );

    let deltas = text_deltas.lock().unwrap();
    assert_eq!(deltas.len(), 2);
@@ -137,6 +145,7 @@ async fn test_callback_tool_call_complete() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    let tool_starts = Arc::new(Mutex::new(Vec::<(String, String)>::new()));
    let tool_completes = Arc::new(Mutex::new(Vec::new()));
@@ -154,8 +163,8 @@ async fn test_callback_tool_call_complete() {
        });
    });

-    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let _ = engine.run("Weather please").await;
+    // Mutable::run consumes self, returns (Locked, EngineRunExit)
+    let _ = engine.run(&mut history, "Weather please").await;

    let starts = tool_starts.lock().unwrap();
    assert_eq!(starts.len(), 1);
@@ -183,6 +192,7 @@ async fn test_callback_turn_events() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    let turn_starts = Arc::new(Mutex::new(Vec::new()));
    let turn_ends = Arc::new(Mutex::new(Vec::new()));
@@ -197,9 +207,9 @@ async fn test_callback_turn_events() {
        ends.lock().unwrap().push(turn);
    });

-    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let result = engine.run("Do something").await;
-    assert!(result.is_ok());
+    // Mutable::run consumes self, returns (Locked, EngineRunExit)
+    let result = engine.run(&mut history, "Do something").await;
+    assert!(matches!(result.result, agen::EngineRunExit::Finished));

    let starts = turn_starts.lock().unwrap();
    let ends = turn_ends.lock().unwrap();
@@ -254,6 +264,7 @@ async fn test_callback_tool_result_events() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    engine.register_tool(fixed_tool(
        "fixed",
@@ -276,7 +287,7 @@ async fn test_callback_tool_result_events() {
        ));
    });

-    let _ = engine.run("call it").await;
+    let _ = engine.run(&mut history, "call it").await;

    let observed = captured.lock().unwrap();
    assert_eq!(observed.len(), 1);
@@ -330,6 +341,7 @@ async fn test_callback_tool_result_error_path() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    engine.register_tool(erroring_tool("erroring", "boom"));

@@ -345,7 +357,7 @@ async fn test_callback_tool_result_error_path() {
        ));
    });

-    let _ = engine.run("fail it").await;
+    let _ = engine.run(&mut history, "fail it").await;

    let observed = captured.lock().unwrap();
    assert_eq!(observed.len(), 1);
@@ -374,6 +386,7 @@ async fn test_callback_usage_events() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    let usage_events = Arc::new(Mutex::new(Vec::new()));

@@ -382,8 +395,8 @@ async fn test_callback_usage_events() {
        usages.lock().unwrap().push(event.clone());
    });

-    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let _ = engine.run("Hello").await;
+    // Mutable::run consumes self, returns (Locked, EngineRunExit)
+    let _ = engine.run(&mut history, "Hello").await;

    let usages = usage_events.lock().unwrap();
    assert_eq!(usages.len(), 1);
@@ -19,6 +19,7 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 pub struct MockLlmClient {
    responses: Arc<Vec<Vec<Event>>>,
    call_count: Arc<AtomicUsize>,
+    requests: Arc<Mutex<Vec<Request>>>,
 }

 impl MockLlmClient {
@@ -30,6 +31,7 @@ impl MockLlmClient {
        Self {
            responses: Arc::new(responses),
            call_count: Arc::new(AtomicUsize::new(0)),
+            requests: Arc::new(Mutex::new(Vec::new())),
        }
    }

@@ -41,6 +43,10 @@ impl MockLlmClient {
    pub fn event_count(&self) -> usize {
        self.responses.iter().map(|v| v.len()).sum()
    }
+
+    pub fn requests(&self) -> Vec<Request> {
+        self.requests.lock().unwrap().clone()
+    }
 }

 #[async_trait]
@@ -51,8 +57,9 @@ impl LlmClient for MockLlmClient {

    async fn stream(
        &self,
-        _request: Request,
+        request: Request,
    ) -> Result<Pin<Box<dyn Stream<Item = Result<Event, ClientError>> + Send>>, ClientError> {
+        self.requests.lock().unwrap().push(request);
        let count = self.call_count.fetch_add(1, Ordering::SeqCst);
        if count >= self.responses.len() {
            return Err(ClientError::Api {
@@ -134,11 +134,15 @@ async fn test_engine_simple_text_response() {

    let client = MockLlmClient::from_fixture(&fixture_path).unwrap();
    let engine = Engine::new(client);
+    let mut history = agen::History::new();

    // Send a simple message (Mutable::run consumes self, returns tuple)
-    let result = engine.run("Hello").await;
+    let result = engine.run(&mut history, "Hello").await;

-    assert!(result.is_ok(), "Engine should complete successfully");
+    assert!(
+        matches!(result.result, agen::EngineRunExit::Finished),
+        "Engine should complete successfully"
+    );
 }

 /// Verify that Engine can correctly process responses containing tool calls
@@ -156,6 +160,7 @@ async fn test_engine_tool_call() {

    let client = MockLlmClient::from_fixture(&fixture_path).unwrap();
    let mut engine = Engine::new(client);
+    let mut history = agen::History::new();

    // Register tool
    let weather_tool = MockWeatherTool::new();
@@ -163,7 +168,9 @@ async fn test_engine_tool_call() {
    engine.register_tool(weather_tool.definition());

    // Send message (Mutable::run consumes self, returns tuple)
-    let _result = engine.run("What's the weather in Tokyo?").await;
+    let _result = engine
+        .run(&mut history, "What's the weather in Tokyo?")
+        .await;

    // Verify tool was called
    // Note: max_turns=1 so no request is sent after tool result
@@ -195,11 +202,15 @@ async fn test_engine_with_programmatic_events() {

    let client = MockLlmClient::new(events);
    let engine = Engine::new(client);
+    let mut history = agen::History::new();

    // Mutable::run consumes self, returns tuple
-    let result = engine.run("Greet me").await;
+    let result = engine.run(&mut history, "Greet me").await;

-    assert!(result.is_ok(), "Engine should complete successfully");
+    assert!(
+        matches!(result.result, agen::EngineRunExit::Finished),
+        "Engine should complete successfully"
+    );
 }

 /// Verify that ToolCallCollector correctly collects ToolCall from ToolUse block events
@@ -9,9 +9,12 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex};

 use agen::Item;
+use agen::interceptor::{
+    Interceptor, PreRequestAction, PreToolAction, ToolCallInfo, TurnEndAction,
+};
 use agen::llm_client::event::{Event, ResponseStatus, StatusEvent};
 use agen::tool::{Tool, ToolDefinition, ToolError, ToolMeta, ToolOutput};
-use agen::{Engine, EngineError};
+use agen::{Engine, EngineError, EngineRunExit, History, StopReason};
 use async_trait::async_trait;
 use common::MockLlmClient;

@@ -39,36 +42,37 @@ fn test_mutable_set_system_prompt() {
 fn test_mutable_history_manipulation() {
    let client = MockLlmClient::new(vec![]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();

    // Initial state is empty
-    assert!(engine.history().is_empty());
+    assert!(history.is_empty());

    // Add to history
    engine
-        .append_history(vec![Item::user_message("Hello")])
+        .append_history(&mut history, vec![Item::user_message("Hello")])
        .unwrap();
    engine
-        .append_history(vec![Item::assistant_message("Hi there!")])
+        .append_history(&mut history, vec![Item::assistant_message("Hi there!")])
        .unwrap();
-    assert_eq!(engine.history().len(), 2);
+    assert_eq!(history.len(), 2);

    // Append to history via the callback-aware API.
    engine
-        .append_history(vec![Item::user_message("How are you?")])
+        .append_history(&mut history, vec![Item::user_message("How are you?")])
        .unwrap();
-    assert_eq!(engine.history().len(), 3);
+    assert_eq!(history.len(), 3);

    // Clear history
-    engine.clear_history();
-    assert!(engine.history().is_empty());
+    engine.clear_history(&mut history);
+    assert!(history.is_empty());

    // Set history
    let items = vec![
        Item::user_message("Test"),
        Item::assistant_message("Response"),
    ];
-    engine.set_history(items);
-    assert_eq!(engine.history().len(), 2);
+    engine.set_history(&mut history, items);
+    assert_eq!(history.len(), 2);
 }

 /// Verify that Engine can be constructed using builder pattern
@@ -76,9 +80,10 @@ fn test_mutable_history_manipulation() {
 fn test_mutable_builder_pattern() {
    let client = MockLlmClient::new(vec![]);
    let engine = Engine::new(client).system_prompt("System prompt");
+    let history: History = History::new();

    assert_eq!(engine.get_system_prompt(), Some("System prompt"));
-    assert!(engine.history().is_empty());
+    assert!(history.is_empty());
 }

 /// Verify that multiple items can be added with append_history and callbacks fire.
@@ -88,6 +93,7 @@ fn test_mutable_append_history() {
    let observed = Arc::new(Mutex::new(Vec::new()));
    let observed_for_callback = Arc::clone(&observed);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    engine.on_history_append(move |item| {
        if let Some(text) = item.as_text() {
            observed_for_callback.lock().unwrap().push(text.to_string());
@@ -96,18 +102,21 @@ fn test_mutable_append_history() {
    });

    engine
-        .append_history(vec![Item::user_message("First")])
+        .append_history(&mut history, vec![Item::user_message("First")])
        .unwrap();

    engine
-        .append_history(vec![
-            Item::assistant_message("Response 1"),
-            Item::user_message("Second"),
-            Item::assistant_message("Response 2"),
-        ])
+        .append_history(
+            &mut history,
+            vec![
+                Item::assistant_message("Response 1"),
+                Item::user_message("Second"),
+                Item::assistant_message("Response 2"),
+            ],
+        )
        .unwrap();

-    assert_eq!(engine.history().len(), 4);
+    assert_eq!(history.len(), 4);
    assert_eq!(
        observed.lock().unwrap().as_slice(),
        ["First", "Response 1", "Second", "Response 2"]
@@ -182,6 +191,7 @@ async fn history_append_failure_stops_before_tool_execution() {
    ]);
    let tool = CountingTool::new("count_tool");
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    engine.register_tool(tool.definition());
    engine.on_history_append(|item| {
        if item.is_tool_call() {
@@ -191,15 +201,15 @@ async fn history_append_failure_stops_before_tool_execution() {
        }
    });

-    let mut engine = engine.lock();
-    let error = engine.run("use the tool").await.unwrap_err();
+    let mut engine = engine.lock(&history);
+    let exit = engine.run(&mut history, "use the tool").await;

    assert!(
-        matches!(error, EngineError::HistoryAppend(ref message) if message == "simulated ENOSPC")
+        matches!(exit, EngineRunExit::Interrupted(StopReason::Unexpected(EngineError::HistoryAppend(ref message))) if message == "simulated ENOSPC")
    );
    assert_eq!(tool.call_count(), 0);
-    assert_eq!(engine.history().len(), 1);
-    assert_eq!(engine.history()[0].as_text(), Some("use the tool"));
+    assert_eq!(history.len(), 1);
+    assert_eq!(history.entries()[0].item.as_text(), Some("use the tool"));
 }

 // =============================================================================
@@ -211,21 +221,22 @@ async fn history_append_failure_stops_before_tool_execution() {
 fn test_lock_transition() {
    let client = MockLlmClient::new(vec![]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();

    engine.set_system_prompt("System");
    engine
-        .append_history(vec![Item::user_message("Hello")])
+        .append_history(&mut history, vec![Item::user_message("Hello")])
        .unwrap();
    engine
-        .append_history(vec![Item::assistant_message("Hi")])
+        .append_history(&mut history, vec![Item::assistant_message("Hi")])
        .unwrap();

    // Lock
-    let locked_engine = engine.lock();
+    let locked_engine = engine.lock(&history);

    // History and system prompt are still accessible in Locked state
    assert_eq!(locked_engine.get_system_prompt(), Some("System"));
-    assert_eq!(locked_engine.history().len(), 2);
+    assert_eq!(history.len(), 2);
    assert_eq!(locked_engine.locked_prefix_len(), 2);
 }

@@ -234,21 +245,22 @@ fn test_lock_transition() {
 fn test_unlock_transition() {
    let client = MockLlmClient::new(vec![]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();

    engine
-        .append_history(vec![Item::user_message("Hello")])
+        .append_history(&mut history, vec![Item::user_message("Hello")])
        .unwrap();
-    let locked_engine = engine.lock();
+    let locked_engine = engine.lock(&history);

    // Unlock
    let mut engine = locked_engine.unlock();

    // History operations are available again in Mutable state
    engine
-        .append_history(vec![Item::assistant_message("Hi")])
+        .append_history(&mut history, vec![Item::assistant_message("Hi")])
        .unwrap();
-    engine.clear_history();
-    assert!(engine.history().is_empty());
+    engine.clear_history(&mut history);
+    assert!(history.is_empty());
 }

 // =============================================================================
@@ -269,20 +281,20 @@ async fn test_mutable_run_updates_history() -> Result<(), EngineError> {

    let client = MockLlmClient::new(events);
    let engine = Engine::new(client);
+    let mut history: History = History::new();

    // Execute (Mutable::run consumes self, returns EngineRunOutput)
-    let out = engine.run("Hi there").await?;
-    let engine = out.engine;
+    let _out = engine.run(&mut history, "Hi there").await;

    // History is updated
-    let history = engine.history();
+    let entries = history.entries();
    assert_eq!(history.len(), 2); // user + assistant

    // User message
-    assert_eq!(history[0].as_text(), Some("Hi there"));
+    assert_eq!(entries[0].item.as_text(), Some("Hi there"));

    // Assistant message
-    assert_eq!(history[1].as_text(), Some("Hello, I'm an assistant!"));
+    assert_eq!(entries[1].item.as_text(), Some("Hello, I'm an assistant!"));

    Ok(())
 }
@@ -313,35 +325,36 @@ async fn test_locked_multi_turn_history_accumulation() {
    ]);

    let engine = Engine::new(client).system_prompt("You are helpful.");
+    let mut history: History = History::new();

    // Lock (after setting system prompt)
-    let mut locked_engine = engine.lock();
+    let mut locked_engine = engine.lock(&history);
    assert_eq!(locked_engine.locked_prefix_len(), 0); // No items yet

    // Turn 1
-    let result1 = locked_engine.run("Hello!").await;
-    assert!(result1.is_ok());
-    assert_eq!(locked_engine.history().len(), 2); // user + assistant
+    let result1 = locked_engine.run(&mut history, "Hello!").await;
+    assert!(matches!(result1, EngineRunExit::Finished));
+    assert_eq!(history.len(), 2); // user + assistant

    // Turn 2
-    let result2 = locked_engine.run("Can you help me?").await;
-    assert!(result2.is_ok());
-    assert_eq!(locked_engine.history().len(), 4); // 2 * (user + assistant)
+    let result2 = locked_engine.run(&mut history, "Can you help me?").await;
+    assert!(matches!(result2, EngineRunExit::Finished));
+    assert_eq!(history.len(), 4); // 2 * (user + assistant)

    // Verify history contents
-    let history = locked_engine.history();
+    let entries = history.entries();

    // Turn 1 user message
-    assert_eq!(history[0].as_text(), Some("Hello!"));
+    assert_eq!(entries[0].item.as_text(), Some("Hello!"));

    // Turn 1 assistant message
-    assert_eq!(history[1].as_text(), Some("Nice to meet you!"));
+    assert_eq!(entries[1].item.as_text(), Some("Nice to meet you!"));

    // Turn 2 user message
-    assert_eq!(history[2].as_text(), Some("Can you help me?"));
+    assert_eq!(entries[2].item.as_text(), Some("Can you help me?"));

    // Turn 2 assistant message
-    assert_eq!(history[3].as_text(), Some("I can help with that."));
+    assert_eq!(entries[3].item.as_text(), Some("I can help with that."));
 }

 /// Verify that locked_prefix_len correctly records history length at lock time
@@ -367,26 +380,33 @@ async fn test_locked_prefix_len_tracking() {
    ]);

    let mut engine = Engine::new(client);
+    let mut history: History = History::new();

    // Add items beforehand
    engine
-        .append_history(vec![Item::user_message("Pre-existing message 1")])
+        .append_history(
+            &mut history,
+            vec![Item::user_message("Pre-existing message 1")],
+        )
        .unwrap();
    engine
-        .append_history(vec![Item::assistant_message("Pre-existing response 1")])
+        .append_history(
+            &mut history,
+            vec![Item::assistant_message("Pre-existing response 1")],
+        )
        .unwrap();

-    assert_eq!(engine.history().len(), 2);
+    assert_eq!(history.len(), 2);

    // Lock
-    let mut locked_engine = engine.lock();
+    let mut locked_engine = engine.lock(&history);
    assert_eq!(locked_engine.locked_prefix_len(), 2); // 2 items at lock time

    // Execute turn
-    locked_engine.run("New message").await.unwrap();
+    locked_engine.run(&mut history, "New message").await;

    // History grows but locked_prefix_len remains unchanged
-    assert_eq!(locked_engine.history().len(), 4); // 2 + 2
+    assert_eq!(history.len(), 4); // 2 + 2
    assert_eq!(locked_engine.locked_prefix_len(), 2); // Unchanged
 }

@@ -413,18 +433,22 @@ async fn test_turn_count_increment() -> Result<(), EngineError> {
    ]);

    let engine = Engine::new(client);
+    let mut history: History = History::new();

    assert_eq!(engine.turn_count(), 0);
    assert_eq!(engine.llm_call_count(), 0);

    // First run consumes Mutable, returns EngineRunOutput
-    let mut engine = engine.run("First").await?.engine;
+    let mut engine = engine.run(&mut history, "First").await.engine;
    assert_eq!(engine.turn_count(), 1);
    // Retry not yet implemented → AgentTurn:LlmCall is 1:1.
    assert_eq!(engine.llm_call_count(), 1);

    // Subsequent runs on Locked take &mut self
-    engine.run("Second").await?;
+    assert!(matches!(
+        engine.run(&mut history, "Second").await,
+        EngineRunExit::Finished
+    ));
    assert_eq!(engine.turn_count(), 2);
    assert_eq!(engine.llm_call_count(), 2);

@@ -444,28 +468,29 @@ async fn test_unlock_edit_relock() {
    ]]);

    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    engine
-        .append_history(vec![
-            Item::user_message("Hello"),
-            Item::assistant_message("Hi"),
-        ])
+        .append_history(
+            &mut history,
+            vec![Item::user_message("Hello"), Item::assistant_message("Hi")],
+        )
        .unwrap();

    // Lock -> Unlock
-    let locked = engine.lock();
+    let locked = engine.lock(&history);
    assert_eq!(locked.locked_prefix_len(), 2);

    let mut unlocked = locked.unlock();

    // Edit history
-    unlocked.clear_history();
+    unlocked.clear_history(&mut history);
    unlocked
-        .append_history(vec![Item::user_message("Fresh start")])
+        .append_history(&mut history, vec![Item::user_message("Fresh start")])
        .unwrap();

    // Re-lock
-    let relocked = unlocked.lock();
-    assert_eq!(relocked.history().len(), 1);
+    let relocked = unlocked.lock(&history);
+    assert_eq!(history.len(), 1);
    assert_eq!(relocked.locked_prefix_len(), 1);
 }

@@ -508,19 +533,26 @@ async fn test_lock_unlock_relock_tools_remain_effective() {
    ]);

    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    let tool_a = CountingTool::new("tool_a");
    engine.register_tool(tool_a.definition());

-    let mut locked = engine.lock();
-    locked.run("first").await.expect("first run");
+    let mut locked = engine.lock(&history);
+    assert!(matches!(
+        locked.run(&mut history, "first").await,
+        EngineRunExit::Finished
+    ));
    assert_eq!(tool_a.call_count(), 1, "tool_a should be called once");

    let mut unlocked = locked.unlock();
    let tool_b = CountingTool::new("tool_b");
    unlocked.register_tool(tool_b.definition());

-    let mut relocked = unlocked.lock();
-    relocked.run("second").await.expect("second run");
+    let mut relocked = unlocked.lock(&history);
+    assert!(matches!(
+        relocked.run(&mut history, "second").await,
+        EngineRunExit::Finished
+    ));

    assert_eq!(tool_a.call_count(), 1, "tool_a should not be called again");
    assert_eq!(tool_b.call_count(), 1, "tool_b should be called once");
@@ -535,8 +567,9 @@ async fn test_lock_unlock_relock_tools_remain_effective() {
 fn test_system_prompt_preserved_in_locked_state() {
    let client = MockLlmClient::new(vec![]);
    let engine = Engine::new(client).system_prompt("Important system prompt");
+    let history: History = History::new();

-    let locked = engine.lock();
+    let locked = engine.lock(&history);
    assert_eq!(locked.get_system_prompt(), Some("Important system prompt"));

    let unlocked = locked.unlock();
@@ -551,13 +584,228 @@ fn test_system_prompt_preserved_in_locked_state() {
 fn test_system_prompt_change_after_unlock() {
    let client = MockLlmClient::new(vec![]);
    let engine = Engine::new(client).system_prompt("Original prompt");
+    let history: History = History::new();

-    let locked = engine.lock();
+    let locked = engine.lock(&history);
    let mut unlocked = locked.unlock();

    unlocked.set_system_prompt("New prompt");
    assert_eq!(unlocked.get_system_prompt(), Some("New prompt"));

-    let relocked = unlocked.lock();
+    let relocked = unlocked.lock(&history);
    assert_eq!(relocked.get_system_prompt(), Some("New prompt"));
 }
+
+fn completed_text_events() -> Vec<Event> {
+    vec![
+        Event::text_block_start(0),
+        Event::text_delta(0, "done"),
+        Event::text_block_stop(0, None),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]
+}
+
+struct YieldOnce {
+    calls: AtomicUsize,
+}
+
+#[async_trait]
+impl Interceptor for YieldOnce {
+    async fn pre_llm_request(&self, _context: &mut Vec<Item>) -> PreRequestAction {
+        if self.calls.fetch_add(1, Ordering::SeqCst) == 0 {
+            PreRequestAction::Yield
+        } else {
+            PreRequestAction::Continue
+        }
+    }
+}
+
+struct PauseToolOnce {
+    calls: AtomicUsize,
+}
+
+#[async_trait]
+impl Interceptor for PauseToolOnce {
+    async fn pre_tool_call(&self, _info: &mut ToolCallInfo) -> PreToolAction {
+        if self.calls.fetch_add(1, Ordering::SeqCst) == 0 {
+            PreToolAction::Pause
+        } else {
+            PreToolAction::Continue
+        }
+    }
+}
+
+struct ContinueTurnOnce {
+    calls: AtomicUsize,
+}
+
+#[async_trait]
+impl Interceptor for ContinueTurnOnce {
+    async fn on_turn_end(&self, _history: &[Item]) -> TurnEndAction {
+        if self.calls.fetch_add(1, Ordering::SeqCst) == 0 {
+            TurnEndAction::ContinueWithMessages(vec![Item::system_message("continue")])
+        } else {
+            TurnEndAction::Finish
+        }
+    }
+}
+
+#[tokio::test]
+async fn max_turns_is_scoped_to_each_fresh_run() {
+    let mut history: History = History::new();
+    let responses = vec![completed_text_events(), completed_text_events()];
+    let mut engine = Engine::new(MockLlmClient::with_responses(responses));
+    engine.set_max_turns(Some(1));
+    let mut engine = engine.lock(&history);
+
+    assert!(matches!(
+        engine.run(&mut history, "first").await,
+        EngineRunExit::Finished
+    ));
+    assert_eq!(engine.turn_count(), 1);
+    assert_eq!(engine.active_run_turn_count(), None);
+
+    assert!(matches!(
+        engine.run(&mut history, "second").await,
+        EngineRunExit::Finished
+    ));
+    assert_eq!(engine.turn_count(), 2);
+    assert_eq!(engine.active_run_turn_count(), None);
+}
+
+#[tokio::test]
+async fn yielded_resume_keeps_the_same_unspent_turn_budget() {
+    let mut history: History = History::new();
+    let mut engine = Engine::new(MockLlmClient::new(completed_text_events()));
+    engine.set_max_turns(Some(1));
+    engine.set_interceptor(YieldOnce {
+        calls: AtomicUsize::new(0),
+    });
+    let mut engine = engine.lock(&history);
+
+    assert!(matches!(
+        engine.run(&mut history, "start").await,
+        EngineRunExit::Yielded
+    ));
+    assert_eq!(engine.turn_count(), 0);
+    assert_eq!(engine.active_run_turn_count(), Some(0));
+
+    assert!(matches!(
+        engine.resume(&mut history).await,
+        EngineRunExit::Finished
+    ));
+    assert_eq!(engine.turn_count(), 1);
+    assert_eq!(engine.active_run_turn_count(), None);
+}
+
+#[tokio::test]
+async fn paused_tool_resume_does_not_reset_the_consumed_turn_budget() {
+    let mut history: History = History::new();
+    let events = vec![
+        Event::tool_use_start(0, "call_1", "count_tool"),
+        Event::tool_input_delta(0, "{}"),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ];
+    let tool = CountingTool::new("count_tool");
+    let mut engine = Engine::new(MockLlmClient::new(events));
+    engine.set_max_turns(Some(1));
+    engine.register_tool(tool.definition());
+    engine.set_interceptor(PauseToolOnce {
+        calls: AtomicUsize::new(0),
+    });
+    let mut engine = engine.lock(&history);
+
+    assert!(matches!(
+        engine.run(&mut history, "call it").await,
+        EngineRunExit::Paused
+    ));
+    assert_eq!(engine.turn_count(), 1);
+    assert_eq!(engine.active_run_turn_count(), Some(1));
+    assert_eq!(tool.call_count(), 0);
+
+    assert!(matches!(
+        engine.resume(&mut history).await,
+        EngineRunExit::Interrupted(StopReason::LimitReached)
+    ));
+    assert_eq!(engine.turn_count(), 1);
+    assert_eq!(engine.active_run_turn_count(), None);
+    assert_eq!(tool.call_count(), 1, "the consumed turn's tool still runs");
+}
+
+#[tokio::test]
+async fn fresh_input_abandons_a_paused_run_and_starts_a_new_budget() {
+    let mut history: History = History::new();
+    let tool_events = vec![
+        Event::tool_use_start(0, "call_1", "count_tool"),
+        Event::tool_input_delta(0, "{}"),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ];
+    let client = MockLlmClient::with_responses(vec![tool_events, completed_text_events()]);
+    let tool = CountingTool::new("count_tool");
+    let mut engine = Engine::new(client);
+    engine.set_max_turns(Some(1));
+    engine.register_tool(tool.definition());
+    engine.set_interceptor(PauseToolOnce {
+        calls: AtomicUsize::new(0),
+    });
+    let mut engine = engine.lock(&history);
+
+    assert!(matches!(
+        engine.run(&mut history, "pause").await,
+        EngineRunExit::Paused
+    ));
+    assert_eq!(engine.active_run_turn_count(), Some(1));
+
+    assert!(matches!(
+        engine.run(&mut history, "replace").await,
+        EngineRunExit::Finished
+    ));
+    assert_eq!(engine.turn_count(), 2);
+    assert_eq!(engine.active_run_turn_count(), None);
+    assert_eq!(tool.call_count(), 1, "pending-tool semantics are unchanged");
+}
+
+#[tokio::test]
+async fn interceptor_continuation_consumes_the_logical_run_budget() {
+    let mut history: History = History::new();
+    let mut engine = Engine::new(MockLlmClient::new(completed_text_events()));
+    engine.set_max_turns(Some(1));
+    engine.set_interceptor(ContinueTurnOnce {
+        calls: AtomicUsize::new(0),
+    });
+    let mut engine = engine.lock(&history);
+
+    assert!(matches!(
+        engine.run(&mut history, "start").await,
+        EngineRunExit::Interrupted(StopReason::LimitReached)
+    ));
+    assert_eq!(engine.turn_count(), 1);
+    assert_eq!(engine.llm_call_count(), 1);
+    assert_eq!(engine.active_run_turn_count(), None);
+}
+
+#[tokio::test]
+async fn restored_active_run_budget_is_enforced_before_another_llm_call() {
+    let mut history: History = History::new();
+    let mut engine = Engine::new(MockLlmClient::new(completed_text_events()));
+    engine.set_max_turns(Some(1));
+    engine.set_turn_count(7);
+    engine.set_active_run_turn_count(Some(1));
+    let mut engine = engine.lock(&history);
+
+    assert!(matches!(
+        engine.resume(&mut history).await,
+        EngineRunExit::Interrupted(StopReason::LimitReached)
+    ));
+    assert_eq!(engine.turn_count(), 7);
+    assert_eq!(engine.llm_call_count(), 0);
+    assert_eq!(engine.active_run_turn_count(), None);
+}
@@ -6,12 +6,13 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex};
 use std::time::{Duration, Instant};

-use agen::Engine;
 use agen::interceptor::{Interceptor, PostToolAction, PreToolAction, ToolCallInfo, ToolResultInfo};
 use agen::llm_client::event::{Event, ResponseStatus, StatusEvent};
 use agen::tool::{
    Tool, ToolDefinition, ToolError, ToolExecutionContext, ToolMeta, ToolOutput, ToolResult,
+    ToolResultDisposition,
 };
+use agen::{Engine, History, Item, ToolExecutionPolicy};
 use async_trait::async_trait;

 mod common;
@@ -70,6 +71,144 @@ impl Tool for SlowTool {
    }
 }

+#[derive(Clone)]
+struct FirstAttemptHangsTool {
+    calls: Arc<AtomicUsize>,
+}
+
+impl FirstAttemptHangsTool {
+    fn new() -> Self {
+        Self {
+            calls: Arc::new(AtomicUsize::new(0)),
+        }
+    }
+
+    fn definition(&self) -> ToolDefinition {
+        let tool = self.clone();
+        Arc::new(move || {
+            let meta = ToolMeta::new("hang_once")
+                .description("Hangs on the first execution attempt")
+                .input_schema(serde_json::json!({"type": "object"}));
+            (meta, Arc::new(tool.clone()) as Arc<dyn Tool>)
+        })
+    }
+
+    fn call_count(&self) -> usize {
+        self.calls.load(Ordering::SeqCst)
+    }
+}
+
+#[async_trait]
+impl Tool for FirstAttemptHangsTool {
+    async fn execute(
+        &self,
+        _input_json: &str,
+        _ctx: ToolExecutionContext,
+    ) -> Result<ToolOutput, ToolError> {
+        let attempt = self.calls.fetch_add(1, Ordering::SeqCst);
+        if attempt == 0 {
+            std::future::pending::<()>().await;
+        }
+        Ok("completed on retry".to_string().into())
+    }
+}
+
+#[derive(Clone)]
+struct CooperativeCancelTool {
+    calls: Arc<AtomicUsize>,
+    cancelled: Arc<tokio::sync::Notify>,
+}
+
+impl CooperativeCancelTool {
+    fn new() -> Self {
+        Self {
+            calls: Arc::new(AtomicUsize::new(0)),
+            cancelled: Arc::new(tokio::sync::Notify::new()),
+        }
+    }
+
+    fn definition(&self) -> ToolDefinition {
+        let tool = self.clone();
+        Arc::new(move || {
+            let meta = ToolMeta::new("cooperative")
+                .description("Returns bounded progress after cancellation")
+                .input_schema(serde_json::json!({"type": "object"}));
+            (meta, Arc::new(tool.clone()) as Arc<dyn Tool>)
+        })
+    }
+}
+
+#[async_trait]
+impl Tool for CooperativeCancelTool {
+    async fn execute(
+        &self,
+        _input_json: &str,
+        _ctx: ToolExecutionContext,
+    ) -> Result<ToolOutput, ToolError> {
+        self.calls.fetch_add(1, Ordering::SeqCst);
+        self.cancelled.notified().await;
+        Err(ToolError::Cancelled(ToolOutput {
+            summary: "cooperative command cancelled".to_string(),
+            content: Some("stdout before cancellation\nstderr before cancellation".to_string()),
+            attachments: Vec::new(),
+        }))
+    }
+
+    async fn cancel(&self, _call_id: &str) -> Result<(), ToolError> {
+        self.cancelled.notify_one();
+        Ok(())
+    }
+}
+
+#[derive(Clone)]
+struct SafePauseTool {
+    calls: Arc<AtomicUsize>,
+    cancellations: Arc<AtomicUsize>,
+    release: Arc<tokio::sync::Notify>,
+}
+
+impl SafePauseTool {
+    fn new() -> Self {
+        Self {
+            calls: Arc::new(AtomicUsize::new(0)),
+            cancellations: Arc::new(AtomicUsize::new(0)),
+            release: Arc::new(tokio::sync::Notify::new()),
+        }
+    }
+
+    fn definition(&self) -> ToolDefinition {
+        let tool = self.clone();
+        Arc::new(move || {
+            let meta = ToolMeta::new("safe_pause")
+                .description("Waits for a safe-boundary release")
+                .input_schema(serde_json::json!({"type": "object"}));
+            (meta, Arc::new(tool.clone()) as Arc<dyn Tool>)
+        })
+    }
+}
+
+#[async_trait]
+impl Tool for SafePauseTool {
+    async fn execute(
+        &self,
+        _input_json: &str,
+        _ctx: ToolExecutionContext,
+    ) -> Result<ToolOutput, ToolError> {
+        self.calls.fetch_add(1, Ordering::SeqCst);
+        self.release.notified().await;
+        Ok(ToolOutput {
+            summary: "safe-boundary complete".to_string(),
+            content: Some("safe-boundary complete".to_string()),
+            attachments: Vec::new(),
+        })
+    }
+
+    async fn cancel(&self, _call_id: &str) -> Result<(), ToolError> {
+        self.cancellations.fetch_add(1, Ordering::SeqCst);
+        Ok(())
+    }
+}
+
 #[derive(Clone)]
 struct ContextRecordingTool {
    name: String,
@@ -145,6 +284,7 @@ async fn test_parallel_tool_execution() {
        ],
    ]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    let tool1 = SlowTool::new("slow_tool_1", 100);
    let tool2 = SlowTool::new("slow_tool_2", 100);
    let tool3 = SlowTool::new("slow_tool_3", 100);
@@ -159,7 +299,7 @@ async fn test_parallel_tool_execution() {

    let start = Instant::now();
    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let _result = engine.run("Run all tools").await;
+    let _result = engine.run(&mut history, "Run all tools").await;
    let elapsed = start.elapsed();

    // Verify all tools were called
@@ -178,6 +318,450 @@ async fn test_parallel_tool_execution() {
    println!("Parallel execution completed in {:?}", elapsed);
 }

+#[tokio::test]
+async fn completed_results_commit_before_publish_without_waiting_for_siblings() {
+    let client = MockLlmClient::with_responses(vec![
+        vec![
+            Event::tool_use_start(0, "call_slow", "slow_first"),
+            Event::tool_input_delta(0, r#"{}"#),
+            Event::tool_use_stop(0),
+            Event::tool_use_start(1, "call_fast", "fast_second"),
+            Event::tool_input_delta(1, r#"{}"#),
+            Event::tool_use_stop(1),
+            Event::Status(StatusEvent {
+                status: ResponseStatus::Completed,
+            }),
+        ],
+        vec![
+            Event::text_block_start(0),
+            Event::text_delta(0, "Done"),
+            Event::text_block_stop(0, None),
+            Event::Status(StatusEvent {
+                status: ResponseStatus::Completed,
+            }),
+        ],
+    ]);
+    let client_probe = client.clone();
+    let mut engine = Engine::new(client);
+    engine.register_tool(SlowTool::new("slow_first", 100).definition());
+    engine.register_tool(SlowTool::new("fast_second", 5).definition());
+
+    let observed = Arc::new(Mutex::new(Vec::<String>::new()));
+    let published = observed.clone();
+    engine.on_tool_result(move |result| {
+        published
+            .lock()
+            .unwrap()
+            .push(format!("publish:{}", result.tool_use_id));
+    });
+
+    let committed = observed.clone();
+    let mut annotate = move |item: &Item| {
+        if let Item::ToolResult { call_id, .. } = item {
+            committed.lock().unwrap().push(format!("commit:{call_id}"));
+        }
+        Ok(())
+    };
+    let mut history = History::new();
+    let _ = engine
+        .run_with_annotation(&mut history, "run both", &mut annotate)
+        .await;
+    observed.lock().unwrap().push("run-returned".to_string());
+
+    assert_eq!(
+        observed.lock().unwrap().as_slice(),
+        [
+            "commit:call_fast",
+            "publish:call_fast",
+            "commit:call_slow",
+            "publish:call_slow",
+            "run-returned",
+        ]
+    );
+
+    let committed_order: Vec<_> = history
+        .iter()
+        .filter_map(|entry| match &entry.item {
+            Item::ToolResult { call_id, .. } => Some(call_id.as_str()),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(committed_order, ["call_fast", "call_slow"]);
+
+    let requests = client_probe.requests();
+    let projected_order: Vec<_> = requests[1]
+        .items
+        .iter()
+        .filter_map(|item| match item {
+            Item::ToolResult { call_id, .. } => Some(call_id.as_str()),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(projected_order, ["call_slow", "call_fast"]);
+}
+
+#[tokio::test]
+async fn cancellation_preserves_completed_results_and_resume_skips_them() {
+    let client = MockLlmClient::with_responses(vec![
+        vec![
+            Event::tool_use_start(0, "call_hang", "hang_once"),
+            Event::tool_input_delta(0, r#"{}"#),
+            Event::tool_use_stop(0),
+            Event::tool_use_start(1, "call_fast_a", "fast_a"),
+            Event::tool_input_delta(1, r#"{}"#),
+            Event::tool_use_stop(1),
+            Event::tool_use_start(2, "call_fast_b", "fast_b"),
+            Event::tool_input_delta(2, r#"{}"#),
+            Event::tool_use_stop(2),
+            Event::Status(StatusEvent {
+                status: ResponseStatus::Completed,
+            }),
+        ],
+        vec![
+            Event::text_block_start(0),
+            Event::text_delta(0, "Recovered"),
+            Event::text_block_stop(0, None),
+            Event::Status(StatusEvent {
+                status: ResponseStatus::Completed,
+            }),
+        ],
+    ]);
+    let mut engine = Engine::new(client);
+    let hanging = FirstAttemptHangsTool::new();
+    let fast_a = SlowTool::new("fast_a", 1);
+    let fast_b = SlowTool::new("fast_b", 2);
+    engine.register_tool(hanging.definition());
+    engine.register_tool(fast_a.definition());
+    engine.register_tool(fast_b.definition());
+
+    let cancel = engine.cancel_sender();
+    let cancel_task = tokio::spawn(async move {
+        tokio::time::sleep(Duration::from_millis(30)).await;
+        cancel.send(()).await.unwrap();
+    });
+    let mut history = History::new();
+    let output = engine.run(&mut history, "start").await;
+    let mut engine = output.engine;
+    cancel_task.await.unwrap();
+
+    let completed_before_resume = history
+        .iter()
+        .filter(|entry| {
+            matches!(
+                &entry.item,
+                Item::ToolResult { call_id, .. }
+                    if call_id == "call_fast_a" || call_id == "call_fast_b"
+            )
+        })
+        .count();
+    let unknown_before_resume = history
+        .iter()
+        .filter(|entry| {
+            matches!(
+                &entry.item,
+                Item::ToolResult {
+                    call_id,
+                    disposition: ToolResultDisposition::OutcomeUnknown,
+                    ..
+                } if call_id == "call_hang"
+            )
+        })
+        .count();
+    assert_eq!(completed_before_resume, 2);
+    assert_eq!(unknown_before_resume, 1);
+    assert_eq!(fast_a.call_count(), 1);
+    assert_eq!(fast_b.call_count(), 1);
+    assert_eq!(hanging.call_count(), 1);
+
+    let _ = engine.resume(&mut history).await;
+
+    assert_eq!(
+        fast_a.call_count(),
+        1,
+        "completed call must not be re-executed"
+    );
+    assert_eq!(
+        fast_b.call_count(),
+        1,
+        "completed call must not be re-executed"
+    );
+    assert_eq!(
+        hanging.call_count(),
+        1,
+        "OutcomeUnknown is terminal and must not be re-executed"
+    );
+    let completed_after_resume = history
+        .iter()
+        .filter(|entry| {
+            matches!(
+                &entry.item,
+                Item::ToolResult { call_id, .. }
+                    if call_id == "call_fast_a" || call_id == "call_fast_b"
+            )
+        })
+        .count();
+    assert_eq!(completed_after_resume, 2);
+    assert_eq!(
+        history
+            .iter()
+            .filter(|entry| {
+                matches!(
+                    &entry.item,
+                    Item::ToolResult {
+                        call_id,
+                        disposition: ToolResultDisposition::OutcomeUnknown,
+                        ..
+                    } if call_id == "call_hang"
+                )
+            })
+            .count(),
+        1
+    );
+}
+
+#[tokio::test]
+async fn cooperative_cancellation_commits_bounded_terminal_output() {
+    let client = MockLlmClient::with_responses(vec![vec![
+        Event::tool_use_start(0, "call_cooperative", "cooperative"),
+        Event::tool_input_delta(0, r#"{}"#),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]]);
+    let mut engine = Engine::new(client);
+    let tool = CooperativeCancelTool::new();
+    engine.register_tool(tool.definition());
+    let observed = Arc::new(Mutex::new(Vec::<&'static str>::new()));
+    let published = observed.clone();
+    engine.on_tool_result(move |_| published.lock().unwrap().push("published"));
+    let committed = observed.clone();
+    let mut annotate = move |item: &Item| {
+        if matches!(item, Item::ToolResult { .. }) {
+            committed.lock().unwrap().push("committed");
+        }
+        Ok(())
+    };
+
+    let cancel = engine.cancel_sender();
+    let cancel_task = tokio::spawn(async move {
+        tokio::time::sleep(Duration::from_millis(30)).await;
+        cancel.send(()).await.unwrap();
+    });
+    let mut history = History::new();
+    let output = engine
+        .run_with_annotation(&mut history, "start", &mut annotate)
+        .await;
+    observed.lock().unwrap().push("run-returned");
+    cancel_task.await.unwrap();
+
+    assert_eq!(
+        observed.lock().unwrap().as_slice(),
+        ["committed", "published", "run-returned"]
+    );
+    assert_eq!(tool.calls.load(Ordering::SeqCst), 1);
+    let terminal: Vec<_> = history
+        .iter()
+        .filter_map(|entry| match &entry.item {
+            Item::ToolResult {
+                call_id,
+                disposition,
+                content,
+                ..
+            } if call_id == "call_cooperative" => Some((*disposition, content.as_deref())),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(terminal.len(), 1);
+    assert_eq!(terminal[0].0, ToolResultDisposition::Cancelled);
+    assert_eq!(
+        terminal[0].1,
+        Some("stdout before cancellation\nstderr before cancellation")
+    );
+    assert!(matches!(
+        output.result,
+        agen::EngineRunExit::Interrupted(agen::StopReason::Cancelled)
+    ));
+}
+
+#[tokio::test]
+async fn pause_waits_for_started_tool_terminal_without_cancelling_provider() {
+    let client = MockLlmClient::with_responses(vec![vec![
+        Event::tool_use_start(0, "call_safe_pause", "safe_pause"),
+        Event::tool_input_delta(0, r#"{}"#),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]]);
+    let mut engine = Engine::new(client);
+    let tool = SafePauseTool::new();
+    engine.register_tool(tool.definition());
+
+    let pause = engine.pause_sender();
+    let calls = Arc::clone(&tool.calls);
+    let release = Arc::clone(&tool.release);
+    let control = tokio::spawn(async move {
+        tokio::time::timeout(Duration::from_secs(1), async {
+            while calls.load(Ordering::SeqCst) == 0 {
+                tokio::task::yield_now().await;
+            }
+        })
+        .await
+        .expect("tool execution starts");
+        pause.send(()).await.unwrap();
+        tokio::time::sleep(Duration::from_millis(50)).await;
+        release.notify_one();
+    });
+
+    let started_at = std::time::Instant::now();
+    let mut history = History::new();
+    let output = engine.run(&mut history, "pause safely").await;
+    control.await.unwrap();
+
+    assert!(started_at.elapsed() >= Duration::from_millis(50));
+    assert_eq!(tool.calls.load(Ordering::SeqCst), 1);
+    assert_eq!(tool.cancellations.load(Ordering::SeqCst), 0);
+    assert!(matches!(output.result, agen::EngineRunExit::Paused));
+    assert!(history.iter().any(|entry| matches!(
+        &entry.item,
+        Item::ToolResult {
+            call_id,
+            disposition: ToolResultDisposition::Success,
+            ..
+        } if call_id == "call_safe_pause"
+    )));
+}
+
+#[tokio::test]
+async fn pause_escalates_to_explicit_cancel_and_confirm_after_safe_boundary_deadline() {
+    let client = MockLlmClient::with_responses(vec![vec![
+        Event::tool_use_start(0, "call_pause_cancel", "cooperative"),
+        Event::tool_input_delta(0, r#"{}"#),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]]);
+    let mut engine = Engine::new(client);
+    engine.set_tool_execution_policy(ToolExecutionPolicy {
+        pause_safe_boundary_timeout: Duration::from_millis(20),
+        cancellation_request_timeout: Duration::from_millis(50),
+        terminal_confirmation_timeout: Duration::from_millis(100),
+    });
+    let tool = CooperativeCancelTool::new();
+    engine.register_tool(tool.definition());
+
+    let pause = engine.pause_sender();
+    let calls = Arc::clone(&tool.calls);
+    let control = tokio::spawn(async move {
+        tokio::time::timeout(Duration::from_secs(1), async {
+            while calls.load(Ordering::SeqCst) == 0 {
+                tokio::task::yield_now().await;
+            }
+        })
+        .await
+        .expect("tool execution starts");
+        pause.send(()).await.unwrap();
+    });
+
+    let mut history = History::new();
+    let output = engine.run(&mut history, "pause with escalation").await;
+    control.await.unwrap();
+
+    assert!(matches!(output.result, agen::EngineRunExit::Paused));
+    assert!(history.iter().any(|entry| matches!(
+        &entry.item,
+        Item::ToolResult {
+            call_id,
+            disposition: ToolResultDisposition::Cancelled,
+            ..
+        } if call_id == "call_pause_cancel"
+    )));
+}
+
+#[tokio::test]
+async fn cancellation_completion_race_commits_one_terminal_output() {
+    for iteration in 0..24u64 {
+        let client = MockLlmClient::with_responses(vec![
+            vec![
+                Event::tool_use_start(0, "call_racy", "racy"),
+                Event::tool_input_delta(0, r#"{}"#),
+                Event::tool_use_stop(0),
+                Event::Status(StatusEvent {
+                    status: ResponseStatus::Completed,
+                }),
+            ],
+            vec![Event::Status(StatusEvent {
+                status: ResponseStatus::Completed,
+            })],
+        ]);
+        let mut engine = Engine::new(client);
+        let delay = 2 + iteration % 3;
+        let tool = SlowTool::new("racy", delay);
+        engine.register_tool(tool.definition());
+        let cancel = engine.cancel_sender();
+        let cancel_task = tokio::spawn(async move {
+            tokio::time::sleep(Duration::from_millis(delay)).await;
+            let _ = cancel.send(()).await;
+        });
+
+        let mut history = History::new();
+        let _ = engine.run(&mut history, "race").await;
+        cancel_task.await.unwrap();
+        let terminal_count = history
+            .iter()
+            .filter(|entry| {
+                matches!(
+                    &entry.item,
+                    Item::ToolResult { call_id, .. } if call_id == "call_racy"
+                )
+            })
+            .count();
+        assert_eq!(terminal_count, 1, "iteration {iteration}");
+        assert_eq!(tool.call_count(), 1, "iteration {iteration}");
+    }
+}
+
+#[tokio::test]
+async fn tool_result_commit_failure_prevents_publication() {
+    let client = MockLlmClient::with_responses(vec![vec![
+        Event::tool_use_start(0, "call_fast", "fast"),
+        Event::tool_input_delta(0, r#"{}"#),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]]);
+    let mut engine = Engine::new(client);
+    engine.register_tool(SlowTool::new("fast", 1).definition());
+
+    let published = Arc::new(AtomicUsize::new(0));
+    let published_probe = published.clone();
+    engine.on_tool_result(move |_| {
+        published_probe.fetch_add(1, Ordering::SeqCst);
+    });
+
+    let mut history = History::new();
+    let mut reject_tool_result = |item: &Item| {
+        if matches!(item, Item::ToolResult { .. }) {
+            Err("session log unavailable".to_string())
+        } else {
+            Ok(())
+        }
+    };
+    let _ = engine
+        .run_with_annotation(&mut history, "start", &mut reject_tool_result)
+        .await;
+
+    assert_eq!(published.load(Ordering::SeqCst), 0);
+    assert!(
+        history
+            .iter()
+            .all(|entry| !matches!(entry.item, Item::ToolResult { .. }))
+    );
+}
+
 #[tokio::test]
 async fn test_tool_execution_context_order_and_batch_id() {
    let client = MockLlmClient::with_responses(vec![
@@ -205,13 +789,14 @@ async fn test_tool_execution_context_order_and_batch_id() {
        ],
    ]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    let contexts = Arc::new(Mutex::new(Vec::new()));

    engine.register_tool(ContextRecordingTool::new("record_a", contexts.clone()).definition());
    engine.register_tool(ContextRecordingTool::new("record_b", contexts.clone()).definition());
    engine.register_tool(ContextRecordingTool::new("record_c", contexts.clone()).definition());

-    let _ = engine.run("record contexts").await;
+    let _ = engine.run(&mut history, "record contexts").await;

    let mut contexts = contexts.lock().unwrap().clone();
    contexts.sort_by_key(|ctx| ctx.call_index);
@@ -256,11 +841,12 @@ async fn test_tool_execution_context_batch_id_changes_between_batches() {
        ],
    ]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    let contexts = Arc::new(Mutex::new(Vec::new()));

    engine.register_tool(ContextRecordingTool::new("record", contexts.clone()).definition());

-    let _ = engine.run("record batches").await;
+    let _ = engine.run(&mut history, "record batches").await;

    let contexts = contexts.lock().unwrap().clone();
    assert_eq!(contexts.len(), 2);
@@ -298,6 +884,7 @@ async fn test_tool_execution_context_for_skipped_and_synthetic_paths() {
        ],
    ]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    let executed_contexts = Arc::new(Mutex::new(Vec::new()));
    let pre_contexts = Arc::new(Mutex::new(Vec::new()));
    let post_contexts = Arc::new(Mutex::new(Vec::new()));
@@ -344,7 +931,9 @@ async fn test_tool_execution_context_for_skipped_and_synthetic_paths() {
        post_contexts: post_contexts.clone(),
    });

-    let _ = engine.run("record skipped and synthetic contexts").await;
+    let _ = engine
+        .run(&mut history, "record skipped and synthetic contexts")
+        .await;

    let mut pre_contexts = pre_contexts.lock().unwrap().clone();
    pre_contexts.sort_by_key(|ctx| ctx.call_index);
@@ -389,6 +978,7 @@ async fn test_before_tool_call_skip() {

    let client = MockLlmClient::new(events);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();

    let allowed_tool = SlowTool::new("allowed_tool", 10);
    let blocked_tool = SlowTool::new("blocked_tool", 10);
@@ -416,7 +1006,7 @@ async fn test_before_tool_call_skip() {
    engine.set_interceptor(BlockingPolicy);

    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let _result = engine.run("Test hook").await;
+    let _result = engine.run(&mut history, "Test hook").await;

    // allowed_tool is called, but blocked_tool is not
    assert_eq!(
@@ -457,6 +1047,7 @@ async fn test_post_tool_call_modification() {
    ]);

    let mut engine = Engine::new(client);
+    let mut history: History = History::new();

    #[derive(Clone)]
    struct SimpleTool;
@@ -503,9 +1094,12 @@ async fn test_post_tool_call_modification() {
    });

    // Mutable::run consumes self, returns (Locked, EngineResult)
-    let result = engine.run("Test modification").await;
+    let result = engine.run(&mut history, "Test modification").await;

-    assert!(result.is_ok(), "Engine should complete");
+    assert!(
+        matches!(result.result, agen::EngineRunExit::Finished),
+        "Engine should complete"
+    );

    // Verify hook was called and content was modified
    let content = modified_content.lock().unwrap().clone();
@@ -540,6 +1134,7 @@ async fn test_before_tool_call_synthetic_result_committed() {
        ],
    ]);
    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    let blocked_tool = SlowTool::new("blocked_tool", 10);
    let blocked_clone = blocked_tool.clone();
    engine.register_tool(blocked_tool.definition());
@@ -558,10 +1153,10 @@ async fn test_before_tool_call_synthetic_result_committed() {

    engine.set_interceptor(SyntheticPolicy);

-    let result = engine.run("Test synthetic result").await.unwrap();
+    let _result = engine.run(&mut history, "Test synthetic result").await;

    assert_eq!(blocked_clone.call_count(), 0, "Blocked tool should not run");
-    assert!(result.engine.history().iter().any(|item| matches!(
+    assert!(history.items().any(|item| matches!(
        item,
        agen::Item::ToolResult {
            call_id,
@@ -571,3 +1166,76 @@ async fn test_before_tool_call_synthetic_result_committed() {
        } if call_id == "call_1" && summary == "permission denied"
    )));
 }
+
+#[tokio::test]
+async fn post_tool_abort_commits_confirmed_result_before_stopping_run() {
+    let client = MockLlmClient::new(vec![
+        Event::tool_use_start(0, "call_confirmed", "confirmed"),
+        Event::tool_input_delta(0, r#"{}"#),
+        Event::tool_use_stop(0),
+        Event::Status(StatusEvent {
+            status: ResponseStatus::Completed,
+        }),
+    ]);
+    let mut engine = Engine::new(client);
+    let tool = SlowTool::new("confirmed", 1);
+    engine.register_tool(tool.definition());
+
+    struct AbortAfterResult;
+    #[async_trait]
+    impl Interceptor for AbortAfterResult {
+        async fn post_tool_call(&self, _info: &mut ToolResultInfo) -> PostToolAction {
+            PostToolAction::Abort("policy stopped the run".to_string())
+        }
+    }
+    engine.set_interceptor(AbortAfterResult);
+
+    let observed = Arc::new(Mutex::new(Vec::<&'static str>::new()));
+    let published = observed.clone();
+    engine.on_tool_result(move |_| published.lock().unwrap().push("published"));
+    let committed = observed.clone();
+    let mut annotate = move |item: &Item| {
+        if matches!(item, Item::ToolResult { .. }) {
+            committed.lock().unwrap().push("committed");
+        }
+        Ok(())
+    };
+
+    let mut history = History::new();
+    let output = engine
+        .run_with_annotation(&mut history, "run confirmed tool", &mut annotate)
+        .await;
+    observed.lock().unwrap().push("run-returned");
+
+    assert_eq!(tool.call_count(), 1);
+    assert_eq!(
+        observed.lock().unwrap().as_slice(),
+        ["committed", "published", "run-returned"]
+    );
+    assert!(matches!(
+        output.result,
+        agen::EngineRunExit::Interrupted(agen::StopReason::Unexpected(
+            agen::EngineError::Aborted(ref reason)
+        )) if reason == "policy stopped the run"
+    ));
+    let terminal: Vec<_> = history
+        .iter()
+        .filter_map(|entry| match &entry.item {
+            Item::ToolResult {
+                call_id,
+                disposition,
+                ..
+            } if call_id == "call_confirmed" => Some(*disposition),
+            _ => None,
+        })
+        .collect();
+    assert_eq!(terminal, [ToolResultDisposition::Success]);
+    assert!(!history.iter().any(|entry| matches!(
+        &entry.item,
+        Item::ToolResult {
+            call_id,
+            disposition: ToolResultDisposition::OutcomeUnknown,
+            ..
+        } if call_id == "call_confirmed"
+    )));
+}
@@ -13,12 +13,12 @@

 mod common;

-use agen::Engine;
 use agen::Item;
 use agen::llm_client::event::{
    BlockMetadata, BlockStart, BlockStop, BlockType, Event, ReasoningBlockData, ResponseStatus,
    StatusEvent,
 };
+use agen::{Engine, History};
 use common::MockLlmClient;

 fn reasoning_block(text: impl Into<String>, data: ReasoningBlockData) -> Vec<Event> {
@@ -65,15 +65,15 @@ async fn anthropic_thinking_round_trips_signature_into_history() {
    ]);
    let client = MockLlmClient::new(events);
    let engine = Engine::new(client);
-    let out = engine.run("question?").await.expect("run ok");
-    let engine = out.engine;
+    let mut history: History = History::new();
+    let _out = engine.run(&mut history, "question?").await;

-    let history = engine.history();
+    let entries = history.entries();
    // user / reasoning / assistant_message
    assert_eq!(history.len(), 3, "history: {history:?}");

-    assert!(matches!(history[0], Item::Message { .. }));
-    match &history[1] {
+    assert!(matches!(entries[0].item, Item::Message { .. }));
+    match &entries[1].item {
        Item::Reasoning {
            text, signature, ..
        } => {
@@ -82,7 +82,7 @@ async fn anthropic_thinking_round_trips_signature_into_history() {
        }
        other => panic!("expected Reasoning, got {other:?}"),
    }
-    assert_eq!(history[2].as_text(), Some("Here's the answer"));
+    assert_eq!(entries[2].item.as_text(), Some("Here's the answer"));
 }

 /// OpenAI Responses 風: encrypted_content + summary を持った reasoning が
@@ -109,11 +109,11 @@ async fn openai_reasoning_round_trips_encrypted_and_summary() {
    ]);
    let client = MockLlmClient::new(events);
    let engine = Engine::new(client);
-    let out = engine.run("q").await.expect("run ok");
-    let engine = out.engine;
+    let mut history: History = History::new();
+    let _out = engine.run(&mut history, "q").await;

-    let history = engine.history();
-    match &history[1] {
+    let entries = history.entries();
+    match &entries[1].item {
        Item::Reasoning {
            text,
            summary,
@@ -155,13 +155,13 @@ async fn reasoning_precedes_text_in_assistant_burst() {
    }));
    let client = MockLlmClient::new(events);
    let engine = Engine::new(client);
-    let out = engine.run("q").await.expect("run ok");
-    let engine = out.engine;
+    let mut history: History = History::new();
+    let _out = engine.run(&mut history, "q").await;

-    let history = engine.history();
+    let entries = history.entries();
    // user / reasoning(先頭) / assistant_message
-    assert!(matches!(history[1], Item::Reasoning { .. }));
-    assert_eq!(history[2].as_text(), Some("intermediate"));
+    assert!(matches!(entries[1].item, Item::Reasoning { .. }));
+    assert_eq!(entries[2].item.as_text(), Some("intermediate"));
 }

 /// resume シナリオ: history.json 由来の Item::Reasoning(signature) を Engine に
@@ -207,14 +207,18 @@ async fn injected_reasoning_survives_into_outgoing_request() {
    };

    let mut engine = Engine::new(client);
+    let mut history: History = History::new();
    // resume: 既存 history を流し込む
-    engine.set_history(vec![
-        Item::user_message("prior question"),
-        Item::reasoning("prior thinking").with_signature("SIG-PRIOR"),
-        Item::assistant_message("prior answer"),
-    ]);
+    engine.set_history(
+        &mut history,
+        vec![
+            Item::user_message("prior question"),
+            Item::reasoning("prior thinking").with_signature("SIG-PRIOR"),
+            Item::assistant_message("prior answer"),
+        ],
+    );

-    let _ = engine.run("follow up").await.expect("run ok");
+    let _ = engine.run(&mut history, "follow up").await;

    let req = captured
        .lock()
@@ -1,4 +1,4 @@
-use agen::Engine;
+use agen::{Engine, History};
 use agen::llm_client::capability::{
    CacheStrategy, ModelCapability, StructuredOutput, ToolCallingSupport,
 };
@@ -22,7 +22,8 @@ fn main() {
        cap,
    );
    let engine = Engine::new(client);
-    let mut locked = engine.lock();
+    let history = History::new();
+    let mut locked = engine.lock(&history);
    let def: agen::tool::ToolDefinition = Arc::new(|| panic!("unused"));
    let _ = locked.register_tool(def);
 }
@@ -1,8 +1,8 @@
 error[E0599]: no method named `register_tool` found for struct `Engine<HttpTransport<AnthropicScheme>, Locked>` in the current scope
-  --> tests/ui/locked_register_tool.rs:27:20
+  --> tests/ui/locked_register_tool.rs:28:20
   |
-27 |     let _ = locked.register_tool(def);
+28 |     let _ = locked.register_tool(def);
   |                    ^^^^^^^^^^^^^ method not found in `Engine<HttpTransport<AnthropicScheme>, Locked>`
   |
   = note: the method was found for
-           - `Engine<C>`
+           - `Engine<C, Mutable, A>`
@@ -24,7 +24,7 @@ pub fn builtin_flow_source(slug: &str) -> Option<BuiltinFlowSource> {
    match slug {
        CODER_REVIEW_FLOW_SLUG => Some(BuiltinFlowSource {
            slug: CODER_REVIEW_FLOW_SLUG,
-            revision: 3,
+            revision: 4,
            path: "builtin/flows/coder-review.dcdl",
            content: CODER_REVIEW_FLOW_SOURCE,
        }),
@@ -35,7 +35,7 @@ pub fn builtin_flow_source(slug: &str) -> Option<BuiltinFlowSource> {
 pub fn builtin_flow_sources() -> &'static [BuiltinFlowSource] {
    const SOURCES: &[BuiltinFlowSource] = &[BuiltinFlowSource {
        slug: CODER_REVIEW_FLOW_SLUG,
-        revision: 3,
+        revision: 4,
        path: "builtin/flows/coder-review.dcdl",
        content: CODER_REVIEW_FLOW_SOURCE,
    }];
@@ -46,6 +46,30 @@ pub fn builtin_flow_sources() -> &'static [BuiltinFlowSource] {
 mod tests {
    use super::*;

+    #[test]
+    fn coder_review_flow_uses_current_selector_ref_review_contract() {
+        let source = builtin_flow_source(CODER_REVIEW_FLOW_SLUG).expect("coder review Flow");
+        for required in [
+            "OpenMergeRequest",
+            "ShowMergeRequest",
+            "ReviewMergeRequest",
+            "CompleteMergeRequest",
+            "existing Merge Request `selector_from`",
+            "Target-only movement does not invalidate",
+        ] {
+            assert!(source.content.contains(required), "missing {required}");
+        }
+        for stale in [
+            "MergeRequestOpen",
+            "MergeRequestShow",
+            "MergeRequestReview",
+            "MergeRequestComplete",
+            "new immutable revision",
+        ] {
+            assert!(!source.content.contains(stale), "stale contract {stale}");
+        }
+    }
+
    #[test]
    fn every_builtin_flow_compiles_and_matches_catalog_identity() {
        assert!(!builtin_flow_sources().is_empty());
@@ -279,4 +279,58 @@ mod tests {
        assert_eq!(grep.matched_files, 2);
        assert!(!grep.output.contains("c.txt"));
    }
+
+    #[test]
+    fn grep_content_groups_lines_by_file_and_marks_matches() {
+        let temp = tempfile::tempdir().unwrap();
+        std::fs::write(
+            temp.path().join("first.txt"),
+            "before\nneedle one\nafter\nomitted one\nomitted two\nbefore distant\nneedle distant\nafter distant\n",
+        )
+        .unwrap();
+        std::fs::write(temp.path().join("second.txt"), "needle two\n").unwrap();
+        let root = temp.path().canonicalize().unwrap();
+        let readable = RootAccess(root.clone());
+
+        let grep = run_grep(
+            &root,
+            root.clone(),
+            GrepRequest {
+                pattern: "needle".to_string(),
+                path: FsPath::root(),
+                glob: Some("*.txt".to_string()),
+                output_mode: GrepOutputMode::Content,
+                case_insensitive: false,
+                before_context: 1,
+                after_context: 1,
+                multiline: false,
+                file_type: None,
+                limit: 20,
+                offset: 0,
+            },
+            &readable,
+        )
+        .unwrap();
+
+        assert_eq!(grep.match_count, 3);
+        assert_eq!(grep.matched_files, 2);
+        assert_eq!(
+            grep.output,
+            concat!(
+                "first.txt\n",
+                "   1 │ before\n",
+                " > 2 │ needle one\n",
+                "   3 │ after\n",
+                "   …\n",
+                "   6 │ before distant\n",
+                " > 7 │ needle distant\n",
+                "   8 │ after distant\n",
+                "\n",
+                "second.txt\n",
+                " > 1 │ needle two\n",
+            )
+        );
+        assert_eq!(grep.output.matches("first.txt").count(), 1);
+        assert_eq!(grep.output.matches("second.txt").count(), 1);
+    }
 }
@@ -1,3 +1,5 @@
+use std::collections::BTreeMap;
+use std::fmt::Write as _;
 use std::path::{Path, PathBuf};

 use crate::FsAccessPolicy;
@@ -57,20 +59,11 @@ impl GrepReport {
                }
            }
            GrepOutputMode::Content => {
-                for line in &self.lines {
-                    let separator = if line.is_match { ':' } else { '-' };
-                    let path = logical_display(root, &line.path);
-                    if self.show_line_numbers
-                        && let Some(number) = line.line_number
-                    {
-                        output.push_str(&format!(
-                            "{path}{separator}{number}{separator}{}\n",
-                            line.text
-                        ));
-                    } else {
-                        output.push_str(&format!("{path}{separator}{}\n", line.text));
-                    }
-                }
+                output.push_str(&render_content_lines(
+                    root,
+                    &self.lines,
+                    self.show_line_numbers,
+                ));
            }
        }
        GrepResult {
@@ -82,6 +75,48 @@ impl GrepReport {
    }
 }

+fn render_content_lines(root: &Path, lines: &[ContentLine], show_line_numbers: bool) -> String {
+    let mut grouped = BTreeMap::<&Path, Vec<&ContentLine>>::new();
+    for line in lines {
+        grouped.entry(&line.path).or_default().push(line);
+    }
+
+    let mut output = String::new();
+    for (file_index, (path, file_lines)) in grouped.into_iter().enumerate() {
+        if file_index > 0 {
+            output.push('\n');
+        }
+        let _ = writeln!(output, "{}", logical_display(root, path));
+
+        let number_width = file_lines
+            .iter()
+            .filter_map(|line| line.line_number)
+            .map(|number| number.to_string().len())
+            .max()
+            .unwrap_or(1);
+        let mut previous_line_end = None;
+        for line in file_lines {
+            if let (Some(previous_end), Some(number)) = (previous_line_end, line.line_number)
+                && number > previous_end
+            {
+                let _ = writeln!(output, "   …");
+            }
+
+            let marker = if line.is_match { '>' } else { ' ' };
+            if show_line_numbers && let Some(number) = line.line_number {
+                let _ = writeln!(output, " {marker} {number:>number_width$} │ {}", line.text);
+            } else {
+                let _ = writeln!(output, " {marker} │ {}", line.text);
+            }
+            previous_line_end = line
+                .line_number
+                .map(|number| number + line.text.split('\n').count() as u64);
+        }
+    }
+
+    output
+}
+
 fn logical_display(root: &Path, path: &Path) -> String {
    path.strip_prefix(root)
        .unwrap_or(path)
@@ -946,7 +946,7 @@ fn apply_role_profile(
    value["feature"]["sub_worker"] = serde_json::json!({ "enabled": sub_worker });
    value["feature"]["flow"] = serde_json::json!({ "enabled": slug == "coder" });
    value["feature"]["worker"] = serde_json::json!({
-        "enabled": matches!(slug, "companion" | "orchestrator"),
+        "enabled": slug == "orchestrator",
        "direct_spawn": slug != "orchestrator"
    });
    value["feature"]["manage_workdir"] = serde_json::json!({
@@ -1408,7 +1408,22 @@ mod tests {
    }

    #[test]
-    fn builtin_companion_can_manage_workdirs() {
+    fn builtin_coder_uses_sub_worker_control_without_worker_control() {
+        let tmp = TempDir::new().unwrap();
+        let resolved = ProfileResolver::new()
+            .with_workspace_base(tmp.path())
+            .resolve(
+                &ProfileSelector::source_named(ProfileRegistrySource::Builtin, "coder"),
+                ProfileResolveOptions::with_worker_name("coder-worker"),
+            )
+            .unwrap();
+
+        assert!(resolved.manifest.feature.sub_worker.enabled);
+        assert!(!resolved.manifest.feature.worker.enabled);
+    }
+
+    #[test]
+    fn builtin_companion_uses_sub_worker_control_without_worker_control() {
        let tmp = TempDir::new().unwrap();
        let resolved = ProfileResolver::new()
            .with_workspace_base(tmp.path())
@@ -1419,6 +1434,8 @@ mod tests {
            .unwrap();

        assert!(resolved.manifest.feature.manage_workdir.enabled);
+        assert!(resolved.manifest.feature.sub_worker.enabled);
+        assert!(!resolved.manifest.feature.worker.enabled);
    }

    #[test]
@@ -9,7 +9,7 @@
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};

-use crate::schema::{EvidenceKind, SourceEvidenceRef, SourceRef};
+use crate::schema::{EvidenceKind, EvidenceOrigin, SourceEvidenceRef, SourceRef};

 /// Current flat staging schema version.
 pub const STAGING_SCHEMA_VERSION: u32 = 2;
@@ -80,6 +80,8 @@ pub struct StagingEvidence {
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub entry_range: Option<[u64; 2]>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub origin: Option<EvidenceOrigin>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub excerpt: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub summary: Option<String>,
@@ -159,6 +161,7 @@ mod tests {
            id: "E001".into(),
            kind: EvidenceKind::new(EvidenceKind::MESSAGE),
            entry_range: Some([10, 12]),
+            origin: None,
            excerpt: Some("extract candidate taxonomy".into()),
            summary: Some("User and assistant discussed staging kinds".into()),
        };
@@ -67,6 +67,40 @@ impl EvidenceKind {
    }
 }

+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum EvidenceOriginKind {
+    HumanInput,
+    WorkerInput,
+    FlowInstruction,
+    BackendInstruction,
+    ModelOutput,
+    ToolOutput,
+    DerivedSummary,
+    LegacyUnknown,
+}
+
+/// Bounded origin snapshot attached to extraction evidence. This is audit
+/// metadata only and cannot authorize Workspace operations.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
+pub struct EvidenceOrigin {
+    pub kind: EvidenceOriginKind,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub account_id: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub workspace_id: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub runtime_id: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub worker_id: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub flow_selector: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub flow_definition_id: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub flow_definition_revision: Option<u64>,
+}
+
 /// Host-resolved source/evidence metadata for an individual staging claim.
 ///
 /// This deliberately stores only bounded anchor metadata: stable ids, entry
@@ -86,6 +120,9 @@ pub struct SourceEvidenceRef {
    /// Host-assigned evidence id within the referenced evidence set.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub evidence_id: Option<String>,
+    /// Trusted typed origin snapshot for this logical evidence entry.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub origin: Option<EvidenceOrigin>,
    /// Extensible evidence kind tag.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub evidence_kind: Option<EvidenceKind>,
@@ -10,7 +10,10 @@ mod decision;
 mod request;
 mod summary;

-pub use common::{EvidenceKind, Frontmatter, SourceEvidenceRef, SourceRef, split_frontmatter};
+pub use common::{
+    EvidenceKind, EvidenceOrigin, EvidenceOriginKind, Frontmatter, SourceEvidenceRef, SourceRef,
+    split_frontmatter,
+};
 pub use decision::{DecisionFrontmatter, DecisionStatus};
 pub use request::RequestFrontmatter;
 pub use summary::SummaryFrontmatter;
@@ -416,7 +416,7 @@ impl MergeRequestStore {
        let conflict:bool=t.query_row("SELECT EXISTS(SELECT 1 FROM merge_request_ticket_relations rel JOIN merge_requests mr ON mr.workspace_id=rel.workspace_id AND mr.merge_request_id=rel.merge_request_id WHERE rel.workspace_id=?1 AND rel.ticket_id=?2 AND mr.state='open')",params![i.auth.workspace_id,i.ticket_id],|r|r.get(0))?;
        if conflict {
            return Err(MergeRequestError::Conflict(
-                "Ticket already has an open Merge Request".into(),
+                "Ticket already has an open Merge Request; use ShowMergeRequest and advance the existing selector_from with a normal non-force push instead of opening a replacement Merge Request or adding a revision".into(),
            ));
        }
        let now = i.now.to_rfc3339();
@@ -575,12 +575,16 @@ impl MergeRequestStore {
            ));
        };
        if subject != i.current_subject_ref {
+            let reason = format!(
+                "selector_from moved from requested subject {subject} to current subject {}; fresh review of the exact current source ref is required",
+                i.current_subject_ref
+            );
            let e = ReviewCancelledEvent {
                event_id: Uuid::now_v7().to_string(),
                sequence: next_seq(&t, &ws, &mr)?,
                request_event_id: req,
                subject_ref: subject,
-                reason: "selector_from moved before submission".into(),
+                reason,
                created_at: i.now,
            };
            insert_event(&t, &ws, &mr, "review_cancelled", &e, i.now, None)?;
@@ -667,9 +671,27 @@ impl MergeRequestStore {
        }
        match (&i.current_subject_ref, &review) {
            (None, _) => b.push("selector_from could not be resolved".into()),
-            (Some(_), None) => b.push("current source ref has no valid review".into()),
-            (_, Some(r)) if r.decision == ReviewDecision::RequestChanges => {
-                b.push("current source ref requests changes".into())
+            (Some(subject_ref), None) => {
+                let previous_review_subject = mr.thread.iter().rev().find_map(|event| match event {
+                    MergeRequestThreadEvent::ReviewRequested(value) => {
+                        Some(value.subject_ref.as_str())
+                    }
+                    MergeRequestThreadEvent::Review(value) => Some(value.subject_ref.as_str()),
+                    _ => None,
+                });
+                match previous_review_subject.filter(|previous| *previous != subject_ref) {
+                    Some(previous) => b.push(format!(
+                        "selector_from moved from reviewed/requested subject {previous} to current subject {subject_ref}; request a fresh review for this exact source ref (selector_to movement alone does not invalidate source approval)"
+                    )),
+                    None => b.push(format!(
+                        "current source ref {subject_ref} has no valid review; request a fresh review for this exact source ref"
+                    )),
+                }
+            }
+            (Some(subject_ref), Some(r)) if r.decision == ReviewDecision::RequestChanges => {
+                b.push(format!(
+                    "current source ref {subject_ref} requests changes; advance the existing selector_from with a normal non-force push, then request a fresh review for the exact new source ref"
+                ))
            }
            _ => {}
        }
@@ -181,16 +181,85 @@ fn source_move_cancels_submission_and_old_approval_is_reusable_when_source_retur
        .is_err()
    );
    let mr = s.get("W", "T").unwrap();
+    let cancellation = mr.thread.iter().find_map(|event| match event {
+        MergeRequestThreadEvent::ReviewCancelled(value) => Some(value),
+        _ => None,
+    });
    assert!(
-        mr.thread
-            .iter()
-            .any(|e| matches!(e, MergeRequestThreadEvent::ReviewCancelled(_)))
+        cancellation
+            .as_ref()
+            .is_some_and(|value| value.reason.contains("selector_from moved")
+                && value.reason.contains("fresh review"))
    );
    assert_eq!(
        mr.effective_review("source-a").map(|r| &r.event_id),
        Some(&approved.event_id)
    );
 }
+#[test]
+fn same_selector_source_advancement_requires_fresh_review_and_preserves_target_only_approval() {
+    let (_d, s) = fixture();
+    open(&s);
+    let first = approve(&s, "source-1", "one");
+
+    let stale = s
+        .readiness(ReadinessCheck {
+            ticket_id: "T".into(),
+            current_subject_ref: Some("source-2".into()),
+            auth: auth(),
+        })
+        .unwrap();
+    assert!(!stale.ready);
+    assert!(stale.review.is_none());
+    assert!(stale.blockers.iter().any(|blocker| {
+        blocker.contains("selector_from moved from reviewed/requested subject source-1")
+            && blocker.contains("current subject source-2")
+            && blocker.contains("fresh review")
+    }));
+    assert_eq!(
+        s.get("W", "T")
+            .unwrap()
+            .effective_review("source-1")
+            .map(|review| &review.event_id),
+        Some(&first.event_id)
+    );
+
+    let second = approve(&s, "source-2", "two");
+    let ready = s
+        .readiness(ReadinessCheck {
+            ticket_id: "T".into(),
+            current_subject_ref: Some("source-2".into()),
+            auth: auth(),
+        })
+        .unwrap();
+    assert!(ready.ready);
+    assert_eq!(
+        ready.review.as_ref().map(|review| &review.event_id),
+        Some(&second.event_id)
+    );
+
+    // The target can move from target-1 to target-2 without changing selector_from
+    // or invalidating the exact-source approval. Completion consumes refreshed
+    // integration evidence for the current target pair.
+    let merged = s
+        .complete(CompleteMergeRequest {
+            operation_id: "target-moved".into(),
+            ticket_id: "T".into(),
+            current_subject_ref: "source-2".into(),
+            target_ref_before: "target-2".into(),
+            target_ref_after: "integrated-target-2".into(),
+            approval_event_id: second.event_id,
+            strategy: MergeStrategy::FastForward,
+            resolution: ConflictResolution::None,
+            auth: auth(),
+            now: at(5),
+        })
+        .unwrap();
+    assert_eq!(merged.approved_source_ref, "source-2");
+    assert_eq!(merged.target_ref_before, "target-2");
+    assert_eq!(merged.target_ref_after, "integrated-target-2");
+}
+
 #[test]
 fn review_revocation_invalidates_readiness() {
    let (_d, s) = fixture();
@@ -281,11 +281,44 @@ impl Method {
 /// Presentation category for an Internal Worker exposed through its parent's
 /// protocol stream. Internal Workers never become independently addressable
 /// protocol subjects.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
 #[serde(rename_all = "snake_case")]
 pub enum InternalWorkerKind {
    SubWorker,
+    Service { kind: String },
+}
+
+/// Stable parent-owned lifecycle for one compaction run.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
+pub struct CompactionLifecycle {
+    pub schema_version: u32,
+    pub compaction_id: String,
+    pub revision: u64,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub internal_worker: Option<InternalWorkerRef>,
+    pub state: CompactionLifecycleState,
+    /// Milliseconds since the Unix epoch.
+    pub started_at_ms: u64,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub ended_at_ms: Option<u64>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub summary: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub error: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub new_segment_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
+#[serde(rename_all = "snake_case")]
+pub enum CompactionLifecycleState {
+    Running,
+    Done,
+    Failed,
+    Interrupted,
 }

 /// Stable presentation identity for one parent-owned Internal Worker session.
@@ -319,6 +352,18 @@ pub struct InternalWorkerSnapshot {
    pub internal_workers: Vec<InternalWorkerSnapshot>,
 }

+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
+#[serde(rename_all = "snake_case")]
+pub enum ToolResultDisposition {
+    #[default]
+    Success,
+    Error,
+    Interrupted,
+    Cancelled,
+    OutcomeUnknown,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[cfg_attr(feature = "typescript", derive(ts_rs::TS))]
 #[serde(tag = "event", content = "data", rename_all = "snake_case")]
@@ -468,6 +513,8 @@ pub enum Event {
        /// summary-only, or when the result was pruned.
        #[serde(default, skip_serializing_if = "Option::is_none")]
        output: Option<String>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        disposition: Option<ToolResultDisposition>,
        #[serde(default)]
        is_error: bool,
    },
@@ -607,23 +654,18 @@ pub enum Event {
    /// This is not part of LLM history or prompt context; clients may display it
    /// briefly as operational status.
    MemoryWorker(MemoryWorkerEvent),
-    /// Worker has started compacting the current session.
-    ///
-    /// Fired immediately before a compaction run. Success is signalled by
-    /// `CompactDone` (with the new `SegmentId`); failure by `CompactFailed`.
-    /// Broadcast to all clients; not replayed to late subscribers.
-    CompactStart,
-    /// Compaction completed and the session was rotated.
-    ///
-    /// `new_segment_id` is the UUID of the freshly created session that
-    /// replaced the old history.
-    CompactDone {
-        #[cfg_attr(feature = "typescript", ts(type = "string"))]
-        new_segment_id: uuid::Uuid,
+    /// Worker has started compacting the current session, or bound the run to its
+    /// observable Internal Worker. Revisions upsert one stable lifecycle item.
+    CompactStart {
+        lifecycle: CompactionLifecycle,
    },
-    /// Compaction failed. The session is unchanged.
+    /// Compaction completed and the session was rotated.
+    CompactDone {
+        lifecycle: CompactionLifecycle,
+    },
+    /// Compaction failed or was cancelled. The session is unchanged.
    CompactFailed {
-        error: String,
+        lifecycle: CompactionLifecycle,
    },
    Shutdown,
 }
@@ -895,6 +937,7 @@ pub enum WorkerStatus {
    Idle,
    Running,
    Paused,
+    Stopped,
 }

 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
@@ -1732,45 +1775,74 @@ mod tests {
        assert_eq!(parsed["data"]["timestamp_ms"], 1_700_000_000_000i64);
    }

+    fn test_compaction_lifecycle(state: CompactionLifecycleState) -> CompactionLifecycle {
+        CompactionLifecycle {
+            schema_version: 2,
+            compaction_id: "0192f0e8-4d84-7d6e-a000-000000000000".into(),
+            revision: 1,
+            internal_worker: None,
+            state,
+            started_at_ms: 1_700_000_000_000,
+            ended_at_ms: None,
+            summary: None,
+            error: None,
+            new_segment_id: None,
+        }
+    }
+
    #[test]
    fn event_compact_start_roundtrip() {
-        let event = Event::CompactStart;
+        let event = Event::CompactStart {
+            lifecycle: test_compaction_lifecycle(CompactionLifecycleState::Running),
+        };
        let json = serde_json::to_string(&event).unwrap();
-        assert_eq!(json, r#"{"event":"compact_start"}"#);
+        let parsed: serde_json::Value = serde_json::from_str(&json).unwrap();
+        assert_eq!(parsed["event"], "compact_start");
+        assert_eq!(parsed["data"]["lifecycle"]["state"], "running");
        let decoded: Event = serde_json::from_str(&json).unwrap();
-        assert!(matches!(decoded, Event::CompactStart));
+        assert!(matches!(decoded, Event::CompactStart { lifecycle } if lifecycle.revision == 1));
    }

    #[test]
    fn event_compact_done_roundtrip() {
        let id = uuid::Uuid::parse_str("0192f0e8-4d84-7d6e-a000-000000000001").unwrap();
-        let event = Event::CompactDone { new_segment_id: id };
+        let mut lifecycle = test_compaction_lifecycle(CompactionLifecycleState::Done);
+        lifecycle.new_segment_id = Some(id.to_string());
+        lifecycle.summary = Some("accepted summary".into());
+        let event = Event::CompactDone { lifecycle };
        let json = serde_json::to_string(&event).unwrap();
        let parsed: serde_json::Value = serde_json::from_str(&json).unwrap();
        assert_eq!(parsed["event"], "compact_done");
        assert_eq!(
-            parsed["data"]["new_segment_id"],
+            parsed["data"]["lifecycle"]["new_segment_id"],
            "0192f0e8-4d84-7d6e-a000-000000000001"
        );
        let decoded: Event = serde_json::from_str(&json).unwrap();
        match decoded {
-            Event::CompactDone { new_segment_id } => assert_eq!(new_segment_id, id),
+            Event::CompactDone { lifecycle } => {
+                assert_eq!(
+                    lifecycle.new_segment_id.as_deref(),
+                    Some(id.to_string().as_str())
+                )
+            }
            other => panic!("expected CompactDone, got {other:?}"),
        }
    }

    #[test]
    fn event_compact_failed_roundtrip() {
-        let event = Event::CompactFailed {
-            error: "provider 429".into(),
-        };
+        let mut lifecycle = test_compaction_lifecycle(CompactionLifecycleState::Failed);
+        lifecycle.error = Some("provider 429".into());
+        let event = Event::CompactFailed { lifecycle };
        let json = serde_json::to_string(&event).unwrap();
        let parsed: serde_json::Value = serde_json::from_str(&json).unwrap();
        assert_eq!(parsed["event"], "compact_failed");
-        assert_eq!(parsed["data"]["error"], "provider 429");
+        assert_eq!(parsed["data"]["lifecycle"]["error"], "provider 429");
        let decoded: Event = serde_json::from_str(&json).unwrap();
        match decoded {
-            Event::CompactFailed { error } => assert_eq!(error, "provider 429"),
+            Event::CompactFailed { lifecycle } => {
+                assert_eq!(lifecycle.error.as_deref(), Some("provider 429"))
+            }
            other => panic!("expected CompactFailed, got {other:?}"),
        }
    }
@@ -1781,6 +1853,7 @@ mod tests {
            id: "call_1".into(),
            summary: "Read 128 bytes".into(),
            output: Some("hello world".into()),
+            disposition: Some(ToolResultDisposition::Success),
            is_error: false,
        };
        let json = serde_json::to_string(&event).unwrap();
@@ -1797,11 +1870,13 @@ mod tests {
                id,
                summary,
                output,
+                disposition,
                is_error,
            } => {
                assert_eq!(id, "call_1");
                assert_eq!(summary, "Read 128 bytes");
                assert_eq!(output.as_deref(), Some("hello world"));
+                assert_eq!(disposition, Some(ToolResultDisposition::Success));
                assert!(!is_error);
            }
            other => panic!("expected ToolResult, got {other:?}"),
@@ -1814,6 +1889,7 @@ mod tests {
            id: "call_2".into(),
            summary: "ok".into(),
            output: None,
+            disposition: Some(ToolResultDisposition::Success),
            is_error: false,
        };
        let json = serde_json::to_string(&event).unwrap();
@@ -1829,6 +1905,7 @@ mod tests {
            id: "call_3".into(),
            summary: "invalid argument".into(),
            output: None,
+            disposition: Some(ToolResultDisposition::Error),
            is_error: true,
        };
        let json = serde_json::to_string(&event).unwrap();
@@ -4,11 +4,11 @@ use ts_rs::{Config, TS};

 use crate::{
    Alert, AlertLevel, AlertSource, CommandEvent, CommandSnapshot, CommandStatus, CommandStream,
-    CommandStreamSlice, CompletionEntry, CompletionKind, ErrorCode, Event, Greeting, InFlightBlock,
-    InFlightSnapshot, InFlightToolCallState, InternalWorkerKind, InternalWorkerRef,
-    InternalWorkerSnapshot, InvokeKind, MemoryWorkerEvent, Method, Permission, RewindSummary,
-    RewindTarget, RewindTargetId, RunResult, ScopeRule, Segment, TurnResult, WorkerEvent,
-    WorkerStatus,
+    CommandStreamSlice, CompactionLifecycle, CompactionLifecycleState, CompletionEntry,
+    CompletionKind, ErrorCode, Event, Greeting, InFlightBlock, InFlightSnapshot,
+    InFlightToolCallState, InternalWorkerKind, InternalWorkerRef, InternalWorkerSnapshot,
+    InvokeKind, MemoryWorkerEvent, Method, Permission, RewindSummary, RewindTarget, RewindTargetId,
+    RunResult, ScopeRule, Segment, ToolResultDisposition, TurnResult, WorkerEvent, WorkerStatus,
    subscription::{
        EventSubscriptionSelector, SubscriptionEvent, SubscriptionEventPayload, SubscriptionFrame,
        SubscriptionFramePayload, SubscriptionId, SubscriptionRejectionCode, SubscriptionRequest,
@@ -45,6 +45,7 @@ pub fn generated_protocol_types() -> String {
    push_decl::<TurnResult>(&cfg, &mut output);
    push_decl::<InvokeKind>(&cfg, &mut output);
    push_decl::<RunResult>(&cfg, &mut output);
+    push_decl::<ToolResultDisposition>(&cfg, &mut output);
    push_decl::<ErrorCode>(&cfg, &mut output);
    push_decl::<Permission>(&cfg, &mut output);
    push_decl::<InFlightToolCallState>(&cfg, &mut output);
@@ -53,6 +54,8 @@ pub fn generated_protocol_types() -> String {
    push_decl::<CommandStreamSlice>(&cfg, &mut output);
    push_decl::<CommandSnapshot>(&cfg, &mut output);
    push_decl::<CommandEvent>(&cfg, &mut output);
+    push_decl::<CompactionLifecycleState>(&cfg, &mut output);
+    push_decl::<CompactionLifecycle>(&cfg, &mut output);
    push_decl::<ScopeRule>(&cfg, &mut output);
    push_decl::<CompletionEntry>(&cfg, &mut output);
    push_decl::<RewindTargetId>(&cfg, &mut output);
@@ -0,0 +1,180 @@
+//! Serializable history entries with restore-authoritative logical identity and origin.
+
+use serde::{Deserialize, Serialize};
+
+use crate::{LoggedItem, SessionId};
+
+/// Stable logical identity of one model-visible history entry.
+///
+/// This value is generated at the trusted Worker session boundary and copied
+/// unchanged across fork, rewind, compaction retention, restore, and reboot.
+#[derive(Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct LoggedSessionHistoryEntryId(pub String);
+
+impl LoggedSessionHistoryEntryId {
+    pub fn new() -> Self {
+        Self(uuid::Uuid::now_v7().to_string())
+    }
+}
+
+impl Default for LoggedSessionHistoryEntryId {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Bounded subject snapshot. It is evidence, not a live authorization handle.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LoggedWorkerSubject {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub workspace_id: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub runtime_id: Option<String>,
+    pub worker_id: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum LoggedSessionHistoryOrigin {
+    HumanInput {
+        account_id: String,
+    },
+    WorkerInput {
+        actor: LoggedWorkerSubject,
+    },
+    FlowInstruction {
+        selector: String,
+        definition_id: String,
+        definition_revision: u64,
+        instance_id: String,
+        state_id: String,
+    },
+    BackendInstruction {
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        operation_id: Option<String>,
+    },
+    ModelOutput {
+        worker: LoggedWorkerSubject,
+    },
+    ToolOutput {
+        worker: LoggedWorkerSubject,
+    },
+    DerivedSummary,
+    LegacyUnknown,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LoggedHistoryDerivation {
+    pub sources: Vec<LoggedSessionHistoryEntryId>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LoggedSessionHistoryMetadata {
+    pub entry_id: LoggedSessionHistoryEntryId,
+    pub origin: LoggedSessionHistoryOrigin,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub derivation: Option<LoggedHistoryDerivation>,
+}
+
+impl LoggedSessionHistoryMetadata {
+    pub fn legacy_unknown() -> Self {
+        Self {
+            entry_id: LoggedSessionHistoryEntryId::new(),
+            origin: LoggedSessionHistoryOrigin::LegacyUnknown,
+            derivation: None,
+        }
+    }
+}
+
+/// Persisted item and metadata are one value so transforms cannot reorder or
+/// truncate one without the other.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct LoggedHistoryEntry {
+    pub item: LoggedItem,
+    pub metadata: LoggedSessionHistoryMetadata,
+}
+
+/// Typed system-item history record. The typed system event remains available
+/// to client replay while its model-visible projection carries the same stable
+/// metadata used by live history.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct LoggedSystemHistoryEntry {
+    pub item: crate::SystemItem,
+    pub metadata: LoggedSessionHistoryMetadata,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::LoggedRole;
+    use agen::llm_client::RequestConfig;
+
+    #[test]
+    fn logged_history_entry_round_trip_preserves_id_origin_and_derivation() {
+        let source_id = LoggedSessionHistoryEntryId::new();
+        let entry = LoggedHistoryEntry {
+            item: LoggedItem::Message {
+                role: LoggedRole::User,
+                content: vec![crate::LoggedContentPart::Text {
+                    text: "preference".into(),
+                }],
+            },
+            metadata: LoggedSessionHistoryMetadata {
+                entry_id: LoggedSessionHistoryEntryId::new(),
+                origin: LoggedSessionHistoryOrigin::HumanInput {
+                    account_id: "account-1".into(),
+                },
+                derivation: Some(LoggedHistoryDerivation {
+                    sources: vec![source_id.clone()],
+                }),
+            },
+        };
+        let encoded = serde_json::to_vec(&entry).unwrap();
+        let decoded: LoggedHistoryEntry = serde_json::from_slice(&encoded).unwrap();
+        assert_eq!(decoded, entry);
+        assert_eq!(
+            decoded.metadata.derivation.unwrap().sources,
+            vec![source_id]
+        );
+    }
+
+    #[test]
+    fn annotated_segment_start_is_restore_visible_without_projecting_metadata() {
+        let session_id = uuid::Uuid::now_v7();
+        let history_entry = legacy_logged_history(LoggedItem::Message {
+            role: LoggedRole::Assistant,
+            content: vec![crate::LoggedContentPart::Text {
+                text: "answer".into(),
+            }],
+        });
+        let state = crate::collect_state(&[crate::LogEntry::AnnotatedSegmentStart {
+            ts: 1,
+            session_id,
+            system_prompt: None,
+            config: RequestConfig::default(),
+            history: vec![history_entry],
+            forked_from: None,
+            compacted_from: None,
+        }]);
+        assert_eq!(state.history[0].as_text(), Some("answer"));
+    }
+}
+
+/// Legacy Session Logs did not persist annotations. Decode helpers explicitly
+/// create `LegacyUnknown`; they never infer Human/System authority from role or
+/// plaintext.
+pub fn legacy_logged_history(item: LoggedItem) -> LoggedHistoryEntry {
+    LoggedHistoryEntry {
+        item,
+        metadata: LoggedSessionHistoryMetadata::legacy_unknown(),
+    }
+}
+
+pub fn legacy_segment_history(
+    session_id: SessionId,
+    items: impl IntoIterator<Item = LoggedItem>,
+) -> Vec<LoggedHistoryEntry> {
+    let _ = session_id;
+    items.into_iter().map(legacy_logged_history).collect()
+}
@@ -32,6 +32,7 @@

 pub mod event_trace;
 pub mod fs_store;
+pub mod history;
 pub mod logged_item;
 pub mod segment;
 pub mod segment_log;
@@ -44,6 +45,11 @@ pub use agen::UsageRecord;
 pub use agen::llm_client::types::{ContentPart, Item, Role};
 pub use event_trace::{TraceEntry, TracePayload};
 pub use fs_store::FsStore;
+pub use history::{
+    LoggedHistoryDerivation, LoggedHistoryEntry, LoggedSessionHistoryEntryId,
+    LoggedSessionHistoryMetadata, LoggedSessionHistoryOrigin, LoggedSystemHistoryEntry,
+    LoggedWorkerSubject, legacy_logged_history, legacy_segment_history,
+};
 pub use logged_item::{LoggedContentPart, LoggedItem, LoggedRole, from_logged, to_logged};
 pub use segment::{
    SegmentStartState, append_entry, append_system_item, classify_history_item,
@@ -14,7 +14,7 @@

 use agen::{
    llm_client::types::{ContentPart, Item, Role},
-    tool::{Attachment, ImageAttachment},
+    tool::{Attachment, ImageAttachment, ToolResultDisposition},
 };
 use base64::{Engine as _, engine::general_purpose::STANDARD};
 use serde::{Deserialize, Deserializer, Serialize, Serializer, de::Error as _};
@@ -61,6 +61,8 @@ pub enum LoggedItem {
        content: Option<String>,
        #[serde(default, skip_serializing_if = "Vec::is_empty")]
        attachments: Vec<LoggedAttachment>,
+        #[serde(default, skip_serializing_if = "ToolResultDisposition::is_success")]
+        disposition: ToolResultDisposition,
        #[serde(default, skip_serializing_if = "is_false")]
        is_error: bool,
    },
@@ -128,6 +130,7 @@ impl From<&Item> for LoggedItem {
                summary,
                content,
                attachments,
+                disposition,
                is_error,
                ..
            } => Self::ToolResult {
@@ -135,6 +138,7 @@ impl From<&Item> for LoggedItem {
                summary: summary.clone(),
                content: content.clone(),
                attachments: attachments.iter().map(LoggedAttachment::from).collect(),
+                disposition: *disposition,
                is_error: *is_error,
            },
            Item::Reasoning {
@@ -184,15 +188,24 @@ impl From<LoggedItem> for Item {
                summary,
                content,
                attachments,
+                disposition,
                is_error,
-            } => Item::ToolResult {
-                id: None,
-                call_id,
-                summary,
-                content,
-                is_error,
-                attachments: attachments.into_iter().map(Attachment::from).collect(),
-            },
+            } => {
+                let disposition = if is_error && disposition.is_success() {
+                    ToolResultDisposition::Error
+                } else {
+                    disposition
+                };
+                Item::ToolResult {
+                    id: None,
+                    call_id,
+                    summary,
+                    content,
+                    disposition,
+                    is_error,
+                    attachments: attachments.into_iter().map(Attachment::from).collect(),
+                }
+            }
            LoggedItem::Reasoning {
                text,
                summary,
@@ -430,6 +443,42 @@ mod tests {
        }
    }

+    #[test]
+    fn outcome_unknown_tool_result_round_trips_as_terminal() {
+        let original = Item::tool_result_item_with_disposition_and_attachments(
+            "call_unknown",
+            "outcome unknown",
+            Some("bounded progress".to_string()),
+            ToolResultDisposition::OutcomeUnknown,
+            Vec::new(),
+        );
+        let logged: LoggedItem = (&original).into();
+        let json = serde_json::to_string(&logged).unwrap();
+        assert!(json.contains(r#""disposition":"outcome_unknown""#));
+        match Item::from(serde_json::from_str::<LoggedItem>(&json).unwrap()) {
+            Item::ToolResult {
+                disposition,
+                is_error,
+                ..
+            } => {
+                assert_eq!(disposition, ToolResultDisposition::OutcomeUnknown);
+                assert!(is_error);
+            }
+            other => panic!("unexpected variant: {other:?}"),
+        }
+    }
+
+    #[test]
+    fn legacy_error_tool_result_infers_error_disposition() {
+        let legacy = r#"{"kind":"tool_result","call_id":"call_old","summary":"failed","content":null,"is_error":true}"#;
+        match Item::from(serde_json::from_str::<LoggedItem>(legacy).unwrap()) {
+            Item::ToolResult { disposition, .. } => {
+                assert_eq!(disposition, ToolResultDisposition::Error)
+            }
+            other => panic!("unexpected variant: {other:?}"),
+        }
+    }
+
    #[test]
    fn tool_result_persistence_round_trips_binary_attachments() {
        let original = Item::tool_result_item_with_attachments(
@@ -307,6 +307,7 @@ pub fn save_run_completed(
    segment_id: SegmentId,
    result: EngineResult,
    interrupted: bool,
+    active_run_turn_count: Option<usize>,
 ) -> Result<(), StoreError> {
    append_entry(
        store,
@@ -316,6 +317,7 @@ pub fn save_run_completed(
            ts: segment_log::now_millis(),
            interrupted,
            result,
+            active_run_turn_count,
        },
    )
 }
@@ -14,6 +14,7 @@ use agen::{EngineResult, UsageRecord};
 use protocol::{InvokeKind, Segment};
 use serde::{Deserialize, Serialize};

+use crate::history::{LoggedHistoryEntry, LoggedSystemHistoryEntry};
 use crate::logged_item::LoggedItem;
 use crate::system_item::SystemItem;

@@ -70,6 +71,20 @@ pub enum LogEntry {
        compacted_from: Option<SegmentOrigin>,
    },

+    /// Schema-v2 segment seed. Retained entries keep their stable logical
+    /// identity and origin across fork/compaction/restore.
+    AnnotatedSegmentStart {
+        ts: u64,
+        session_id: crate::SessionId,
+        system_prompt: Option<String>,
+        config: RequestConfig,
+        history: Vec<LoggedHistoryEntry>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        forked_from: Option<SegmentOrigin>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        compacted_from: Option<SegmentOrigin>,
+    },
+
    /// IDLE → active marker. Records the start of a new self-driving
    /// cycle (Invoke range). The range extends implicitly until the
    /// next `Invoke` entry; this entry carries the trigger only — the
@@ -105,14 +120,37 @@ pub enum LogEntry {
        extensions: Vec<SessionExtension>,
    },

+    /// Schema-v2 user submission with its exact model-visible entries. Typed
+    /// Flow instructions and caller-attributed input remain separate entries.
+    AnnotatedUserInput {
+        ts: u64,
+        segments: Vec<Segment>,
+        #[serde(default, skip_serializing_if = "Vec::is_empty")]
+        extensions: Vec<SessionExtension>,
+        history: Vec<LoggedHistoryEntry>,
+    },
+
+    /// Schema-v2 model output and metadata committed as one journal record.
+    AnnotatedAssistantItem { ts: u64, entry: LoggedHistoryEntry },
+
    /// One assistant-side item appended to history — assistant message,
    /// reasoning, or tool call. Singular: one entry per history item so
    /// the wire-side `Event::*` lane and on-disk LogEntry stay 1:1.
    AssistantItem { ts: u64, item: LoggedItem },

+    /// Schema-v2 tool output and metadata committed as one journal record.
+    AnnotatedToolResult { ts: u64, entry: LoggedHistoryEntry },
+
    /// One tool-execution result appended to history.
    ToolResult { ts: u64, item: LoggedItem },

+    /// Schema-v2 typed system event and model-visible metadata committed
+    /// together.
+    AnnotatedSystemItem {
+        ts: u64,
+        entry: LoggedSystemHistoryEntry,
+    },
+
    /// One typed agent-injected system item: notification, child-Worker
    /// lifecycle event, `@<path>` / `/<slug>` resolution payload. Each
    /// `SystemItem` carries kind metadata that the LLM
@@ -125,11 +163,16 @@ pub enum LogEntry {
    TurnEnd { ts: u64, turn_count: usize },

    /// `run()` / `resume()` が `EngineResult` で正常終了した。
-    /// Audit-only metadata: replay は `interrupted` のみ反映する。
+    /// Replay restores both interruption state and any resumable logical-run
+    /// turn budget.
    RunCompleted {
        ts: u64,
        interrupted: bool,
        result: EngineResult,
+        /// AgentTurns consumed by a paused/yielded logical run. Terminal
+        /// outcomes persist `None`.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        active_run_turn_count: Option<usize>,
    },

    /// `run()` / `resume()` が `EngineError` で終了した。
@@ -141,6 +184,15 @@ pub enum LogEntry {
        message: String,
    },

+    /// Restores an active logical-run budget at a segment boundary, notably
+    /// after compaction replaced the segment that held the original Invoke and
+    /// RunCompleted entries.
+    ActiveRunCheckpoint {
+        ts: u64,
+        active_turn_count: usize,
+        total_turn_count: usize,
+    },
+
    /// A paused interrupted turn was explicitly abandoned without calling
    /// `run()` or `resume()` again. Replay clears the interrupted marker so
    /// the restored Worker is idle and future user input starts a normal new turn.
@@ -209,6 +261,8 @@ pub struct RestoredState {
    pub config: RequestConfig,
    pub history: Vec<Item>,
    pub turn_count: usize,
+    /// AgentTurns consumed by the active paused/yielded logical run.
+    pub active_run_turn_count: Option<usize>,
    pub last_run_interrupted: bool,
    /// Number of entries replayed. `0` means the segment log was empty.
    /// Writers track their own append count via the same counter so
@@ -238,6 +292,7 @@ pub fn collect_state(entries: &[LogEntry]) -> RestoredState {
        config: RequestConfig::default(),
        history: Vec::new(),
        turn_count: 0,
+        active_run_turn_count: None,
        last_run_interrupted: false,
        entries_count: 0,
        usage_history: Vec::new(),
@@ -261,10 +316,27 @@ pub fn collect_state(entries: &[LogEntry]) -> RestoredState {
                state.config = config.clone();
                state.history = history.iter().cloned().map(Item::from).collect();
            }
+            LogEntry::AnnotatedSegmentStart {
+                session_id,
+                system_prompt,
+                config,
+                history,
+                ..
+            } => {
+                state.session_id = Some(*session_id);
+                state.system_prompt = system_prompt.clone();
+                state.config = config.clone();
+                state.history = history
+                    .iter()
+                    .cloned()
+                    .map(|entry| Item::from(entry.item))
+                    .collect();
+            }
            LogEntry::Invoke { .. } => {
                // A terminal run record below clears or refines this. If the
                // log ends first, restore must treat the turn as interrupted.
                state.last_run_interrupted = true;
+                state.active_run_turn_count = Some(0);
            }
            LogEntry::UserInput {
                segments,
@@ -280,6 +352,29 @@ pub fn collect_state(entries: &[LogEntry]) -> RestoredState {
                        .map(|extension| (extension.domain.clone(), extension.payload.clone())),
                );
            }
+            LogEntry::AnnotatedUserInput {
+                segments,
+                extensions,
+                history,
+                ..
+            } => {
+                state
+                    .history
+                    .extend(history.iter().cloned().map(|entry| Item::from(entry.item)));
+                state.user_segments.push(segments.clone());
+                state.extensions.extend(
+                    extensions
+                        .iter()
+                        .map(|extension| (extension.domain.clone(), extension.payload.clone())),
+                );
+            }
+            LogEntry::AnnotatedAssistantItem { entry, .. }
+            | LogEntry::AnnotatedToolResult { entry, .. } => {
+                state.history.push(Item::from(entry.item.clone()));
+            }
+            LogEntry::AnnotatedSystemItem { entry, .. } => {
+                state.history.push(entry.item.to_history_item());
+            }
            LogEntry::AssistantItem { item, .. } => {
                state.history.push(Item::from(item.clone()));
            }
@@ -290,16 +385,44 @@ pub fn collect_state(entries: &[LogEntry]) -> RestoredState {
                state.history.push(item.to_history_item());
            }
            LogEntry::TurnEnd { turn_count, .. } => {
+                if let Some(active_turn_count) = &mut state.active_run_turn_count {
+                    *active_turn_count += turn_count.saturating_sub(state.turn_count);
+                }
                state.turn_count = *turn_count;
            }
-            LogEntry::RunCompleted { interrupted, .. } => {
+            LogEntry::RunCompleted {
+                interrupted,
+                result,
+                active_run_turn_count,
+                ..
+            } => {
                state.last_run_interrupted = *interrupted;
+                if *interrupted && matches!(result, EngineResult::Paused | EngineResult::Yielded) {
+                    // Legacy entries omit the explicit field; retain the
+                    // Invoke/TurnEnd-derived count in that case.
+                    if let Some(turn_count) = active_run_turn_count {
+                        state.active_run_turn_count = Some(*turn_count);
+                    }
+                } else {
+                    state.active_run_turn_count = None;
+                }
            }
            LogEntry::RunErrored { interrupted, .. } => {
                state.last_run_interrupted = *interrupted;
+                state.active_run_turn_count = None;
+            }
+            LogEntry::ActiveRunCheckpoint {
+                active_turn_count,
+                total_turn_count,
+                ..
+            } => {
+                state.active_run_turn_count = Some(*active_turn_count);
+                state.turn_count = *total_turn_count;
+                state.last_run_interrupted = true;
            }
            LogEntry::PausedTurnAbandoned { .. } => {
                state.last_run_interrupted = false;
+                state.active_run_turn_count = None;
            }
            LogEntry::ConfigChanged { config, .. } => {
                state.config = config.clone();
@@ -397,6 +520,7 @@ mod tests {
                ts: 3200,
                interrupted: false,
                result: EngineResult::Finished,
+                active_run_turn_count: None,
            },
        ]);
        assert_eq!(state.history.len(), 2);
@@ -695,10 +819,93 @@ mod tests {
                ts: 100,
                interrupted: true,
                result: EngineResult::Paused,
+                active_run_turn_count: Some(1),
            },
            LogEntry::PausedTurnAbandoned { ts: 200 },
        ]);
        assert!(!state.last_run_interrupted);
+        assert_eq!(state.active_run_turn_count, None);
+    }
+
+    #[test]
+    fn replay_restores_active_run_budget_across_compaction_checkpoint() {
+        let state = collect_state(&[
+            LogEntry::SegmentStart {
+                ts: 0,
+                session_id: uuid::Uuid::nil(),
+                system_prompt: None,
+                config: RequestConfig::default(),
+                history: vec![],
+                forked_from: None,
+                compacted_from: None,
+            },
+            LogEntry::ActiveRunCheckpoint {
+                ts: 100,
+                active_turn_count: 3,
+                total_turn_count: 9,
+            },
+        ]);
+
+        assert_eq!(state.turn_count, 9);
+        assert_eq!(state.active_run_turn_count, Some(3));
+        assert!(state.last_run_interrupted);
+    }
+
+    #[test]
+    fn legacy_interrupted_run_derives_budget_from_invoke_and_turn_end() {
+        let entry: LogEntry = serde_json::from_value(serde_json::json!({
+            "kind": "run_completed",
+            "ts": 300,
+            "interrupted": true,
+            "result": "paused"
+        }))
+        .expect("legacy run-completed entry");
+        let state = collect_state(&[
+            LogEntry::SegmentStart {
+                ts: 0,
+                session_id: uuid::Uuid::nil(),
+                system_prompt: None,
+                config: RequestConfig::default(),
+                history: vec![],
+                forked_from: None,
+                compacted_from: None,
+            },
+            LogEntry::Invoke {
+                ts: 100,
+                trigger: InvokeKind::UserSend,
+            },
+            LogEntry::TurnEnd {
+                ts: 200,
+                turn_count: 2,
+            },
+            entry,
+        ]);
+
+        assert_eq!(state.active_run_turn_count, Some(2));
+        assert!(state.last_run_interrupted);
+    }
+
+    #[test]
+    fn non_resumable_interruption_clears_the_active_run_budget() {
+        let state = collect_state(&[
+            LogEntry::Invoke {
+                ts: 100,
+                trigger: InvokeKind::UserSend,
+            },
+            LogEntry::TurnEnd {
+                ts: 200,
+                turn_count: 2,
+            },
+            LogEntry::RunCompleted {
+                ts: 300,
+                interrupted: true,
+                result: EngineResult::LimitReached,
+                active_run_turn_count: None,
+            },
+        ]);
+
+        assert!(state.last_run_interrupted);
+        assert_eq!(state.active_run_turn_count, None);
    }

    #[test]
@@ -20,7 +20,8 @@ use std::path::{Path, PathBuf};
 use std::sync::{Arc, Mutex};
 use std::time::SystemTime;

-const SESSION_SCHEMA_VERSION: u32 = 1;
+const SESSION_SCHEMA_VERSION: u32 = 2;
+const LEGACY_SESSION_SCHEMA_VERSION: u32 = 1;
 const SESSION_FILE: &str = "session.json";
 const SEGMENTS_DIR: &str = "segments";

@@ -44,15 +45,22 @@ impl WorkerSessionStore {
        fs::create_dir_all(root.join(SEGMENTS_DIR))?;
        let session_id = match fs::read(root.join(SESSION_FILE)) {
            Ok(bytes) => {
-                let manifest: SessionManifest = serde_json::from_slice(&bytes)?;
-                if manifest.schema_version != SESSION_SCHEMA_VERSION {
-                    return Err(StoreError::Corrupt {
-                        line: 0,
-                        message: format!(
-                            "unsupported Worker Session schema version {}, expected {}",
-                            manifest.schema_version, SESSION_SCHEMA_VERSION
-                        ),
-                    });
+                let mut manifest: SessionManifest = serde_json::from_slice(&bytes)?;
+                match manifest.schema_version {
+                    SESSION_SCHEMA_VERSION => {}
+                    LEGACY_SESSION_SCHEMA_VERSION => {
+                        validate_legacy_segment_logs(&root)?;
+                        manifest.schema_version = SESSION_SCHEMA_VERSION;
+                        atomic_write_json(&root.join(SESSION_FILE), &manifest)?;
+                    }
+                    version => {
+                        return Err(StoreError::Corrupt {
+                            line: 0,
+                            message: format!(
+                                "unsupported Worker Session schema version {version}, expected {SESSION_SCHEMA_VERSION}"
+                            ),
+                        });
+                    }
                }
                Some(manifest.session_id)
            }
@@ -278,6 +286,37 @@ impl Store for WorkerSessionStore {
    }
 }

+fn validate_legacy_segment_logs(root: &Path) -> Result<(), StoreError> {
+    let segments = root.join(SEGMENTS_DIR);
+    if !segments.exists() {
+        return Ok(());
+    }
+    for entry in fs::read_dir(&segments)? {
+        let entry = entry?;
+        let path = entry.path();
+        let Some(name) = path.file_name().and_then(|name| name.to_str()) else {
+            continue;
+        };
+        if !name.ends_with(".jsonl") || name.ends_with(".trace.jsonl") {
+            continue;
+        }
+        let contents = fs::read_to_string(&path)?;
+        for (line_index, line) in contents.lines().enumerate() {
+            if line.trim().is_empty() {
+                continue;
+            }
+            serde_json::from_str::<LogEntry>(line).map_err(|error| StoreError::Corrupt {
+                line: line_index + 1,
+                message: format!(
+                    "cannot migrate legacy Worker Session log {}: {error}",
+                    path.display()
+                ),
+            })?;
+        }
+    }
+    Ok(())
+}
+
 fn atomic_write_json<T: Serialize>(path: &Path, value: &T) -> Result<(), StoreError> {
    let mut bytes = serde_json::to_vec_pretty(value)?;
    bytes.push(b'\n');
@@ -405,6 +444,54 @@ mod tests {
        assert_eq!(store.list_sessions().unwrap(), vec![session_id]);
    }

+    #[test]
+    fn schema_v1_logs_are_validated_and_promoted_to_v2() {
+        let root = tempfile::tempdir().unwrap();
+        let session_id = new_session_id();
+        let segment_id = new_segment_id();
+        WorkerSessionStore::new(root.path())
+            .unwrap()
+            .create_segment(session_id, segment_id, &[])
+            .unwrap();
+        let manifest_path = root.path().join(SESSION_FILE);
+        let mut manifest: SessionManifest =
+            serde_json::from_slice(&fs::read(&manifest_path).unwrap()).unwrap();
+        manifest.schema_version = LEGACY_SESSION_SCHEMA_VERSION;
+        atomic_write_json(&manifest_path, &manifest).unwrap();
+
+        let reopened = WorkerSessionStore::new(root.path()).unwrap();
+        assert_eq!(reopened.session_id().unwrap(), Some(session_id));
+        let migrated: SessionManifest =
+            serde_json::from_slice(&fs::read(&manifest_path).unwrap()).unwrap();
+        assert_eq!(migrated.schema_version, SESSION_SCHEMA_VERSION);
+    }
+
+    #[test]
+    fn schema_v1_migration_rejects_corrupt_log_before_manifest_update() {
+        let root = tempfile::tempdir().unwrap();
+        let session_id = new_session_id();
+        let manifest = SessionManifest {
+            schema_version: LEGACY_SESSION_SCHEMA_VERSION,
+            session_id,
+        };
+        atomic_write_json(&root.path().join(SESSION_FILE), &manifest).unwrap();
+        fs::create_dir_all(root.path().join(SEGMENTS_DIR)).unwrap();
+        fs::write(
+            root.path().join(SEGMENTS_DIR).join("broken.jsonl"),
+            "{not-json}\n",
+        )
+        .unwrap();
+
+        let error = match WorkerSessionStore::new(root.path()) {
+            Ok(_) => panic!("corrupt legacy Session log must reject migration"),
+            Err(error) => error,
+        };
+        assert!(matches!(error, StoreError::Corrupt { .. }));
+        let persisted: SessionManifest =
+            serde_json::from_slice(&fs::read(root.path().join(SESSION_FILE)).unwrap()).unwrap();
+        assert_eq!(persisted.schema_version, LEGACY_SESSION_SCHEMA_VERSION);
+    }
+
    #[test]
    fn reopen_preserves_session_and_segment_ids() {
        let root = tempfile::tempdir().unwrap();
@@ -51,6 +51,7 @@ fn round_trip_write_and_read() {
            ts: 3200,
            interrupted: false,
            result: EngineResult::Finished,
+            active_run_turn_count: None,
        },
    ];

@@ -1,12 +1,13 @@
 mod common;

+use std::ops::{Deref, DerefMut};
 use std::sync::Arc;

-use agen::Engine;
 use agen::interceptor::{Interceptor, TurnEndAction};
 use agen::llm_client::event::{Event, ResponseStatus, StatusEvent};
 use agen::llm_client::types::{Item, RequestConfig};
 use agen::tool::{Tool, ToolDefinition, ToolError, ToolMeta, ToolOutput};
+use agen::{Engine, History};
 use async_trait::async_trait;
 use common::MockLlmClient;
 use session_store::{FsStore, LogEntry, SegmentStartState, Store, collect_state};
@@ -94,15 +95,47 @@ fn make_store() -> (tempfile::TempDir, FsStore) {
    (dir, store)
 }

+struct TestWorker {
+    engine: Engine<MockLlmClient>,
+    history: History,
+}
+
+impl TestWorker {
+    fn new(engine: Engine<MockLlmClient>) -> Self {
+        Self {
+            engine,
+            history: History::new(),
+        }
+    }
+
+    fn history(&self) -> Vec<Item> {
+        self.history.items_cloned()
+    }
+}
+
+impl Deref for TestWorker {
+    type Target = Engine<MockLlmClient>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.engine
+    }
+}
+
+impl DerefMut for TestWorker {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.engine
+    }
+}
+
 /// Run a worker turn and persist via session-store functions.
 /// Takes ownership of the worker (needed for lock/unlock) and returns it.
 async fn run_and_persist(
-    worker: Engine<MockLlmClient>,
+    mut worker: TestWorker,
    store: &FsStore,
    session_id: session_store::SessionId,
    segment_id: session_store::SegmentId,
    input: &str,
-) -> (Engine<MockLlmClient>, agen::EngineResult) {
+) -> (TestWorker, agen::EngineRunExit) {
    // Mirror Worker's run-entry contract: log the user input as segments
    // before the worker pushes its flattened user_message; save_delta
    // skips the resulting user_message item to avoid double-write.
@@ -114,41 +147,61 @@ async fn run_and_persist(
    )
    .unwrap();

-    let history_before = worker.history().len();
+    let history_before = worker.history.len();

-    let mut locked = worker.lock();
-    let result = locked.run(input).await;
-    let worker = locked.unlock();
+    let mut locked = worker.engine.lock(&worker.history);
+    let result = locked.run(&mut worker.history, input).await;
+    worker.engine = locked.unlock();

-    let new_items = &worker.history()[history_before..];
+    let projected = worker.history();
+    let new_items = &projected[history_before..];
    session_store::save_delta(store, session_id, segment_id, new_items).unwrap();
    session_store::save_turn_end(store, session_id, segment_id, worker.turn_count()).unwrap();

    match &result {
-        Ok(r) => {
+        agen::EngineRunExit::Finished
+        | agen::EngineRunExit::Paused
+        | agen::EngineRunExit::Yielded => {
+            let (legacy_result, interrupted) = match &result {
+                agen::EngineRunExit::Finished => (agen::EngineResult::Finished, false),
+                agen::EngineRunExit::Paused => (agen::EngineResult::Paused, true),
+                agen::EngineRunExit::Yielded => (agen::EngineResult::Yielded, true),
+                agen::EngineRunExit::Interrupted(_) => unreachable!(),
+            };
            session_store::save_run_completed(
                store,
                session_id,
                segment_id,
-                r.clone(),
-                worker.last_run_interrupted(),
+                legacy_result,
+                interrupted,
+                worker.active_run_turn_count(),
            )
            .unwrap();
        }
-        Err(e) => {
+        agen::EngineRunExit::Interrupted(agen::StopReason::LimitReached) => {
+            session_store::save_run_completed(
+                store,
+                session_id,
+                segment_id,
+                agen::EngineResult::LimitReached,
+                false,
+                worker.active_run_turn_count(),
+            )
+            .unwrap();
+        }
+        agen::EngineRunExit::Interrupted(reason) => {
            session_store::save_run_errored(
                store,
                session_id,
                segment_id,
-                e.to_string(),
-                worker.last_run_interrupted(),
+                format!("{reason:?}"),
+                true,
            )
            .unwrap();
        }
    }

-    let r = result.unwrap();
-    (worker, r)
+    (worker, result)
 }

 // =============================================================================
@@ -159,14 +212,14 @@ async fn run_and_persist(
 async fn session_run_logs_entries() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::new(simple_text_events());
-    let worker = Engine::new(client);
+    let worker = TestWorker::new(Engine::new(client));

    let (sid, segid) = session_store::create_segment(
        &store,
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -203,7 +256,7 @@ async fn session_run_logs_entries() {
 async fn session_restore_round_trip() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::new(simple_text_events());
-    let mut worker = Engine::new(client);
+    let mut worker = TestWorker::new(Engine::new(client));
    worker.set_system_prompt("You are helpful.");

    let (sid, segid) = session_store::create_segment(
@@ -211,7 +264,7 @@ async fn session_restore_round_trip() {
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -242,7 +295,7 @@ async fn session_restore_round_trip() {
 async fn session_run_with_tool_call() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::with_responses(tool_call_events());
-    let mut worker = Engine::new(client);
+    let mut worker = TestWorker::new(Engine::new(client));
    worker.register_tool(weather_tool_definition());

    let (sid, segid) = session_store::create_segment(
@@ -250,7 +303,7 @@ async fn session_run_with_tool_call() {
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -276,7 +329,7 @@ async fn session_resume_after_pause() {

    // First run: tool call with pause policy → Paused
    let client = MockLlmClient::with_responses(tool_call_events());
-    let mut worker = Engine::new(client);
+    let mut worker = TestWorker::new(Engine::new(client));
    worker.register_tool(weather_tool_definition());
    worker.set_interceptor(PausePolicy);

@@ -285,13 +338,13 @@ async fn session_resume_after_pause() {
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();

    let (_worker, result) = run_and_persist(worker, &store, sid, segid, "Weather?").await;
-    assert!(matches!(result, agen::EngineResult::Paused));
+    assert!(matches!(result, agen::EngineRunExit::Paused));

    // Check RunCompleted is Paused
    let entries = store.read_all(sid, segid).unwrap();
@@ -309,13 +362,14 @@ async fn session_resume_after_pause() {
    // Restore state and verify
    let state = session_store::restore(&store, sid, segid).unwrap();
    assert!(state.last_run_interrupted);
+    assert_eq!(state.active_run_turn_count, Some(2));
 }

 #[tokio::test]
 async fn session_fork_creates_new_session() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::new(simple_text_events());
-    let mut worker = Engine::new(client);
+    let mut worker = TestWorker::new(Engine::new(client));
    worker.set_system_prompt("System prompt");

    let (sid, segid) = session_store::create_segment(
@@ -323,7 +377,7 @@ async fn session_fork_creates_new_session() {
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -336,7 +390,7 @@ async fn session_fork_creates_new_session() {
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -357,14 +411,14 @@ async fn session_fork_creates_new_session() {
 async fn session_fork_at_truncates_within_session() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::new(simple_text_events());
-    let worker = Engine::new(client);
+    let worker = TestWorker::new(Engine::new(client));

    let (sid, segid) = session_store::create_segment(
        &store,
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -402,14 +456,14 @@ async fn session_fork_at_truncates_within_session() {
 async fn session_config_changed_logged() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::new(vec![]);
-    let mut worker = Engine::new(client);
+    let mut worker = TestWorker::new(Engine::new(client));

    let (sid, segid) = session_store::create_segment(
        &store,
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -435,14 +489,14 @@ async fn session_auto_forks_on_conflict() {

    // Create a segment
    let client_a = MockLlmClient::new(simple_text_events());
-    let worker_a = Engine::new(client_a);
+    let worker_a = TestWorker::new(Engine::new(client_a));

    let (sid, original_segid) = session_store::create_segment(
        &store,
        SegmentStartState {
            system_prompt: worker_a.get_system_prompt(),
            config: worker_a.request_config(),
-            history: worker_a.history(),
+            history: &worker_a.history(),
        },
    )
    .unwrap();
@@ -468,7 +522,7 @@ async fn session_auto_forks_on_conflict() {
        SegmentStartState {
            system_prompt: worker_a.get_system_prompt(),
            config: worker_a.request_config(),
-            history: worker_a.history(),
+            history: &worker_a.history(),
        },
    )
    .unwrap();
@@ -520,14 +574,14 @@ async fn session_auto_forks_on_conflict() {
 async fn nested_past_fork_leaves_ancestors_immutable() {
    let (_dir, store) = make_store();
    let client = MockLlmClient::new(simple_text_events());
-    let worker = Engine::new(client);
+    let worker = TestWorker::new(Engine::new(client));

    let (sid, root_segid) = session_store::create_segment(
        &store,
        SegmentStartState {
            system_prompt: worker.get_system_prompt(),
            config: worker.request_config(),
-            history: worker.history(),
+            history: &worker.history(),
        },
    )
    .unwrap();
@@ -410,7 +410,7 @@ struct TicketCreateParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketEditItemParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
    /// Optional replacement title.
    #[serde(default)]
@@ -539,7 +539,7 @@ impl QueryTicketParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct ShowTicketParams {
-    /// Ticket id. Exactly one of `id` or `query` must be provided.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility. Exactly one of `id` or `query` must be provided.
    #[serde(default)]
    id: Option<String>,
    /// Exact ticket id query. Exactly one of `id` or `query` must be provided.
@@ -558,7 +558,7 @@ struct ShowTicketParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketThreadEventParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
    /// Markdown event body.
    body: String,
@@ -566,7 +566,7 @@ struct TicketThreadEventParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketMarkReadyParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
    /// Optional reason attached to the state_changed event.
    #[serde(default)]
@@ -575,7 +575,7 @@ struct TicketMarkReadyParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketIntakeReadyParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
    /// Concise bounded intake summary appended before the ready transition.
    intake_summary: String,
@@ -586,13 +586,13 @@ struct TicketIntakeReadyParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketQueueParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
 }

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketWorkflowStateParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
    /// Expected current state. The backend rejects stale transitions.
    from: TicketWorkflowStateParam,
@@ -606,7 +606,7 @@ struct TicketWorkflowStateParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketCloseParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
    /// Markdown resolution written to resolution.md and thread.md.
    resolution: String,
@@ -614,7 +614,7 @@ struct TicketCloseParams {

 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 struct TicketDependencyCheckParams {
-    /// Ticket id.
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    ticket: String,
 }

@@ -646,7 +646,7 @@ struct TicketRelationRecordParams {
    ticket: String,
    /// Forward relation kind: depends_on, blocks, related, supersedes, or duplicate_of.
    kind: TicketRelationKindParam,
-    /// Target canonical Ticket id. Title/slug words are not accepted as relation authority.
+    /// Target Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    target: String,
    /// Optional bounded rationale/note.
    #[serde(default)]
@@ -659,7 +659,7 @@ struct TicketRelationRemoveParams {
    ticket: String,
    /// Forward relation kind to remove.
    kind: TicketRelationKindParam,
-    /// Target canonical Ticket id.
+    /// Target Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    target: String,
 }

@@ -1223,10 +1223,17 @@ impl Tool for TicketQueueTool {
    ) -> Result<ToolOutput, ToolError> {
        let params: TicketQueueParams = parse_input("TicketQueue", input_json)?;
        let queued_by = default_author();
-        let outcome = self
+        let mut outcome = self
            .backend
            .queue_ready(TicketIdOrSlug::Query(params.ticket.clone()), &queued_by)
            .map_err(|error| backend_error("TicketQueue", error))?;
+        outcome.requested_ticket =
+            model_ticket_reference(&self.backend, &outcome.requested_ticket, "TicketQueue")?;
+        outcome.queued_tickets = outcome
+            .queued_tickets
+            .into_iter()
+            .map(|ticket| model_ticket_reference(&self.backend, &ticket, "TicketQueue"))
+            .collect::<Result<Vec<_>, _>>()?;
        Ok(json_output(
            format!(
                "Queued {} ticket(s) for Orchestrator",
@@ -1264,15 +1271,17 @@ impl Tool for TicketWorkflowStateTool {
        self.backend
            .set_workflow_state(TicketIdOrSlug::Query(params.ticket.clone()), change)
            .map_err(|error| backend_error("TicketWorkflowState", error))?;
+        let ticket_ref =
+            model_ticket_reference(&self.backend, &params.ticket, "TicketWorkflowState")?;
        Ok(json_output(
            format!(
                "Transitioned ticket {} state {} -> {}",
-                params.ticket,
+                ticket_ref,
                from.as_str(),
                to.as_str()
            ),
            json!({
-                "ticket": params.ticket,
+                "ticket": ticket_ref,
                "from": from.as_str(),
                "to": to.as_str(),
                "state": to.as_str(),
@@ -1296,9 +1305,10 @@ impl Tool for TicketCloseTool {
                MarkdownText::new(params.resolution),
            )
            .map_err(|error| backend_error("TicketClose", error))?;
+        let ticket_ref = model_ticket_reference(&self.backend, &params.ticket, "TicketClose")?;
        Ok(json_output(
-            format!("Closed ticket {}", params.ticket),
-            json!({ "ticket": params.ticket, "state": "closed", "ok": true }),
+            format!("Closed ticket {ticket_ref}"),
+            json!({ "ticket": ticket_ref, "state": "closed", "ok": true }),
        ))
    }
 }
@@ -1525,6 +1535,29 @@ impl Tool for TicketDependencyCheckTool {
    }
 }

+fn model_ticket_reference(
+    backend: &TicketToolBackend,
+    reference: &str,
+    tool_name: &str,
+) -> Result<String, ToolError> {
+    let ticket = backend
+        .show(TicketIdOrSlug::Id(reference.to_string()))
+        .map_err(|error| backend_error(tool_name, error))?;
+    match ticket.meta.resource_key {
+        Some(resource_key) if is_canonical_ticket_resource_key(&resource_key) => Ok(resource_key),
+        Some(_) => Err(ToolError::ExecutionFailed(format!(
+            "{tool_name} failed: required Ticket key is unavailable"
+        ))),
+        None => Ok(ticket.meta.id),
+    }
+}
+
+fn is_canonical_ticket_resource_key(resource_key: &str) -> bool {
+    resource_key.strip_prefix("T-").is_some_and(|sequence| {
+        !sequence.is_empty() && sequence.bytes().all(|byte| byte.is_ascii_digit())
+    })
+}
+
 fn parse_input<T: for<'de> Deserialize<'de>>(tool: &str, input_json: &str) -> Result<T, ToolError> {
    serde_json::from_str(input_json)
        .map_err(|error| ToolError::InvalidArgument(format!("invalid {tool} input: {error}")))
@@ -1922,6 +1955,12 @@ mod tests {
            .with_target_authority(Arc::new(TestTargetAuthority))
    }

+    fn sqlite_backend(temp: &TempDir) -> crate::SqliteTicketBackend {
+        crate::SqliteTicketBackend::open(temp.path().join("tickets.db"), "workspace")
+            .unwrap()
+            .with_target_authority(Arc::new(TestTargetAuthority))
+    }
+
    fn tool(definition: ToolDefinition) -> Arc<dyn Tool> {
        let (_, tool) = definition();
        tool
@@ -2549,6 +2588,101 @@ mod tests {
        );
    }

+    #[tokio::test]
+    async fn queue_workflow_and_close_project_internal_inputs_to_ticket_keys() {
+        let temp = TempDir::new().unwrap();
+        let inner = sqlite_backend(&temp);
+        let mut dependency_input = NewTicket::new("Dependency");
+        dependency_input.repository_id = Some("main".to_string());
+        let dependency = inner.create(dependency_input).unwrap();
+        let mut target_input = NewTicket::new("Target");
+        target_input.repository_id = Some("main".to_string());
+        let target = inner.create(target_input).unwrap();
+        inner
+            .add_ticket_relation(
+                TicketIdOrSlug::Id(target.id.clone()),
+                NewTicketRelation {
+                    kind: TicketRelationKind::DependsOn,
+                    target: dependency.id.clone(),
+                    note: None,
+                    author: None,
+                },
+            )
+            .unwrap();
+        for id in [&dependency.id, &target.id] {
+            inner
+                .mark_ready(
+                    TicketIdOrSlug::Id(id.clone()),
+                    TicketMarkReady {
+                        operation_key: format!("ready-{id}"),
+                        reason: None,
+                        author: None,
+                        intake_summary: None,
+                    },
+                )
+                .unwrap();
+        }
+        let target_key = target.resource_key.clone().unwrap();
+        let dependency_key = dependency.resource_key.clone().unwrap();
+        let backend = inner;
+        let queue = tool_by_name(TicketToolBackend::new(backend.clone()), "TicketQueue");
+        let workflow = tool_by_name(
+            TicketToolBackend::new(backend.clone()),
+            "TicketWorkflowState",
+        );
+        let close = tool_by_name(TicketToolBackend::new(backend), "TicketClose");
+
+        let queued = queue
+            .execute(
+                &json!({"ticket": target.id.clone()}).to_string(),
+                Default::default(),
+            )
+            .await
+            .unwrap();
+        assert!(queued.summary.contains("2 ticket(s)"));
+        let queued_content = queued.content.unwrap();
+        assert!(queued_content.contains(&target_key));
+        assert!(queued_content.contains(&dependency_key));
+        assert!(!queued_content.contains(&target.id));
+        assert!(!queued_content.contains(&dependency.id));
+
+        for (from, to) in [("queued", "inprogress"), ("inprogress", "done")] {
+            let transitioned = workflow
+                .execute(
+                    &json!({
+                        "ticket": target.id.clone(),
+                        "from": from,
+                        "to": to,
+                        "reason": "test_transition",
+                        "body": "transitioned",
+                        "author": "tester"
+                    })
+                    .to_string(),
+                    Default::default(),
+                )
+                .await
+                .unwrap();
+            assert!(transitioned.summary.contains(&target_key));
+            assert!(!transitioned.summary.contains(&target.id));
+            let content = transitioned.content.unwrap();
+            assert!(content.contains(&target_key));
+            assert!(!content.contains(&target.id));
+        }
+
+        let closed = close
+            .execute(
+                &json!({"ticket": target.id.clone(), "resolution": "Done"}).to_string(),
+                Default::default(),
+            )
+            .await
+            .unwrap();
+        assert!(closed.summary.contains(&target_key));
+        assert!(!closed.summary.contains(&target.id));
+        let content = closed.content.unwrap();
+        assert!(content.contains(&target_key));
+        assert!(!content.contains(&target.id));
+    }
+
    #[tokio::test]
    async fn ticket_workflow_tools_mark_ready_and_transition_state() {
        let temp = TempDir::new().unwrap();
@@ -1,5 +1,6 @@
+use std::collections::{HashMap, HashSet};
 use std::path::PathBuf;
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};

 use agen::tool::{Tool, ToolDefinition, ToolError, ToolMeta, ToolOutput};
 use async_trait::async_trait;
@@ -20,21 +21,65 @@ struct BashParams {

 pub(crate) struct BashTool {
    session: WorkdirSessionHandle,
+    state: Arc<Mutex<BashExecutionState>>,
+}
+
+#[derive(Clone)]
+struct ActiveCommand {
+    call_id: String,
+    execution_nonce: u64,
+    handle: CommandHandle,
+}
+
+#[derive(Default)]
+struct BashExecutionState {
+    active: HashMap<String, ActiveCommand>,
+    cancellation_requested: HashSet<String>,
+    legacy_cancellation_requested: HashSet<String>,
+    next_execution_nonce: u64,
 }

 struct CommandGuard {
    session: WorkdirSessionHandle,
+    state: Arc<Mutex<BashExecutionState>>,
+    execution_id: String,
+    execution_nonce: u64,
    handle: Option<CommandHandle>,
 }

 impl Drop for CommandGuard {
    fn drop(&mut self) {
-        if let Some(handle) = self.handle.take() {
-            let workdir = self.session.clone();
-            tokio::spawn(async move {
-                let _ = workdir.cancel_command(handle).await;
-            });
-        }
+        let Some(handle) = self.handle.take() else {
+            return;
+        };
+        let workdir = self.session.clone();
+        let state = Arc::clone(&self.state);
+        let execution_id = self.execution_id.clone();
+        let execution_nonce = self.execution_nonce;
+        // A dropped provider future is not terminal confirmation. Keep the live
+        // execution registered until cleanup has both requested cancellation and
+        // observed terminal command output, so cancellation/session teardown
+        // cannot race with an apparently empty registry.
+        tokio::spawn(async move {
+            let _ = workdir.cancel_command(handle.clone()).await;
+            let _ = workdir
+                .command_output(CommandOutputRequest {
+                    handle,
+                    cursor: 0,
+                    limit: INLINE_BYTE_BUDGET,
+                    wait: true,
+                })
+                .await;
+            let mut state = state.lock().unwrap();
+            if state
+                .active
+                .get(&execution_id)
+                .is_some_and(|active| active.execution_nonce == execution_nonce)
+            {
+                state.active.remove(&execution_id);
+                state.cancellation_requested.remove(&execution_id);
+            }
+        });
    }
 }

@@ -52,20 +97,50 @@ impl Tool for BashTool {
            .unwrap_or(DEFAULT_TIMEOUT_SECS)
            .clamp(1, MAX_TIMEOUT_SECS);
        let cmd_summary = truncate_for_summary(&params.command);
+        let execution_id = ctx.execution_id();
+        let call_id = ctx.call_id;
+        let execution_nonce = {
+            let mut state = self.state.lock().unwrap();
+            state.next_execution_nonce = state.next_execution_nonce.wrapping_add(1);
+            state.next_execution_nonce
+        };
+        let mut guard = CommandGuard {
+            session: self.session.clone(),
+            state: self.state.clone(),
+            execution_id: execution_id.clone(),
+            execution_nonce,
+            handle: None,
+        };
        let handle = self
            .session
            .start_command(CommandRequest {
                command: params.command,
                timeout_secs,
                output_limit: INLINE_BYTE_BUDGET,
-                tool_call_id: Some(ctx.call_id),
+                tool_call_id: Some(call_id.clone()),
            })
            .await
            .map_err(crate::ToolsError::from)?;
-        let mut guard = CommandGuard {
-            session: self.session.clone(),
-            handle: Some(handle.clone()),
+        let cancel_after_start = {
+            let mut state = self.state.lock().unwrap();
+            state.active.insert(
+                execution_id.clone(),
+                ActiveCommand {
+                    call_id: call_id.clone(),
+                    execution_nonce,
+                    handle: handle.clone(),
+                },
+            );
+            state.cancellation_requested.contains(&execution_id)
+                || state.legacy_cancellation_requested.contains(&call_id)
        };
+        guard.handle = Some(handle.clone());
+        if cancel_after_start {
+            self.session
+                .cancel_command(handle.clone())
+                .await
+                .map_err(crate::ToolsError::from)?;
+        }
        let output = self
            .session
            .command_output(CommandOutputRequest {
@@ -76,9 +151,27 @@ impl Tool for BashTool {
            })
            .await
            .map_err(crate::ToolsError::from)?;
+        let cancellation_requested = {
+            let mut state = self.state.lock().unwrap();
+            let owns_registration = state
+                .active
+                .get(&execution_id)
+                .is_some_and(|active| active.execution_nonce == execution_nonce);
+            let exact = if owns_registration {
+                state.active.remove(&execution_id);
+                state.cancellation_requested.remove(&execution_id)
+            } else {
+                false
+            };
+            let legacy = state.legacy_cancellation_requested.remove(&call_id);
+            exact || legacy
+        };
        guard.handle = None;

-        let summary = if output.timed_out {
+        let timed_out = output.timed_out;
+        let summary = if cancellation_requested {
+            format!("$ {cmd_summary} (cancelled)")
+        } else if output.timed_out {
            format!("$ {cmd_summary} (timed out after {timeout_secs}s)")
        } else {
            match output.exit_code {
@@ -97,11 +190,62 @@ impl Tool for BashTool {
        } else {
            Some(output.content)
        };
-        Ok(ToolOutput {
+        let output = ToolOutput {
            summary,
            content,
            attachments: Vec::new(),
-        })
+        };
+        if cancellation_requested {
+            Err(ToolError::Cancelled(output))
+        } else if timed_out {
+            Err(ToolError::Interrupted(output))
+        } else {
+            Ok(output)
+        }
+    }
+
+    async fn cancel(&self, call_id: &str) -> Result<(), ToolError> {
+        let handles = {
+            let mut state = self.state.lock().unwrap();
+            state
+                .legacy_cancellation_requested
+                .insert(call_id.to_string());
+            state
+                .active
+                .values()
+                .filter(|active| active.call_id == call_id)
+                .map(|active| active.handle.clone())
+                .collect::<Vec<_>>()
+        };
+        for handle in handles {
+            self.session
+                .cancel_command(handle)
+                .await
+                .map_err(crate::ToolsError::from)?;
+        }
+        Ok(())
+    }
+
+    async fn cancel_execution(
+        &self,
+        ctx: &agen::tool::ToolExecutionContext,
+    ) -> Result<(), ToolError> {
+        let execution_id = ctx.execution_id();
+        let handle = {
+            let mut state = self.state.lock().unwrap();
+            state.cancellation_requested.insert(execution_id.clone());
+            state
+                .active
+                .get(&execution_id)
+                .map(|active| active.handle.clone())
+        };
+        if let Some(handle) = handle {
+            self.session
+                .cancel_command(handle)
+                .await
+                .map_err(crate::ToolsError::from)?;
+        }
+        Ok(())
    }
 }

@@ -123,6 +267,7 @@ pub fn bash_tool(session: WorkdirSessionHandle, _output_dir: PathBuf) -> ToolDef
            .input_schema(serde_json::to_value(schema).expect("Bash schema serialization"));
        let tool: Arc<dyn Tool> = Arc::new(BashTool {
            session: session.clone(),
+            state: Arc::new(Mutex::new(BashExecutionState::default())),
        });
        (meta, tool)
    })
@@ -129,7 +129,7 @@ pub fn grep_tool(session: WorkdirSessionHandle) -> ToolDefinition {
    Arc::new(move || {
        let schema = schemars::schema_for!(GrepParams);
        let meta = ToolMeta::new("Grep")
-            .description("Search Workdir file contents with a regex. Glob/Grep traversal executes inside the WorkdirSession provider. Results are bounded and Workdir-relative.")
+            .description("Search Workdir file contents with a regex. Content results group lines by file; `>` marks matching lines and unmarked lines are context. Glob/Grep traversal executes inside the WorkdirSession provider. Results are bounded and Workdir-relative.")
            .input_schema(serde_json::to_value(schema).expect("Grep schema serialization"));
        let tool: Arc<dyn Tool> = Arc::new(GrepTool {
            session: session.clone(),
@@ -7,7 +7,10 @@
 use std::path::Path;
 use std::sync::Arc;

-use agen::tool::{Tool, ToolDefinition, ToolMeta};
+use agen::tool::{
+    Tool, ToolDefinition, ToolError, ToolExecutionContext, ToolExecutionHandle,
+    ToolExecutionTerminal, ToolMeta,
+};
 use manifest::{Permission, Scope, ScopeConfig, ScopeRule};
 use serde_json::json;
 use tempfile::TempDir;
@@ -401,5 +404,84 @@ async fn bash_provider_output_does_not_expose_internal_paths() {
    assert_eq!(std::fs::read_dir(spill.path()).unwrap().count(), 0);
 }

+#[tokio::test]
+async fn bash_cancellation_returns_bounded_progress_as_terminal_output() {
+    let (dir, _spill, reg) = setup();
+    let marker = dir.path().join("must-not-run-after-cancel");
+    let command = format!(
+        "printf 'before\\n'; printf 'err-before\\n' >&2; sleep 1; touch {}; printf 'after\\n'",
+        marker.display()
+    );
+    let input = serde_json::to_string(&json!({ "command": command })).unwrap();
+    let context = ToolExecutionContext::new("call-heavy", "attempt-heavy", 0);
+    let bash = reg.get("Bash");
+    let executing = bash.clone();
+    let execution_context = context.clone();
+    let execution = tokio::spawn(async move { executing.execute(&input, execution_context).await });
+
+    tokio::time::sleep(std::time::Duration::from_millis(100)).await;
+    bash.cancel_execution(&context)
+        .await
+        .expect("signal exact execution cancellation");
+    let error = tokio::time::timeout(std::time::Duration::from_secs(2), execution)
+        .await
+        .expect("cancelled Bash should terminate inside the Engine grace budget")
+        .expect("Bash task join");
+
+    let ToolError::Cancelled(output) = error.expect_err("cancelled command is non-success") else {
+        panic!("expected typed cancellation result");
+    };
+    let content = output.content.expect("bounded progress output");
+    assert!(
+        content.contains("before"),
+        "missing pre-cancel stdout: {content}"
+    );
+    assert!(
+        content.contains("err-before"),
+        "missing pre-cancel stderr: {content}"
+    );
+    assert!(
+        !content.contains("after"),
+        "post-cancel output leaked: {content}"
+    );
+    assert!(content.len() <= 16 * 1024, "output must remain bounded");
+
+    tokio::time::sleep(std::time::Duration::from_millis(1_100)).await;
+    assert!(
+        !marker.exists(),
+        "the cancelled command continued executing after terminal confirmation"
+    );
+}
+
+#[tokio::test]
+async fn bash_force_close_cleanup_stops_command_and_keeps_session_reusable() {
+    let (dir, _spill, reg) = setup();
+    let marker = dir.path().join("must-not-survive-force-close");
+    let command = format!("sleep 1; touch {}", marker.display());
+    let input = serde_json::to_string(&json!({ "command": command })).unwrap();
+    let bash = reg.get("Bash");
+    let context = ToolExecutionContext::new("call-force", "attempt-force", 0);
+    let (handle, terminal) = ToolExecutionHandle::start(bash.clone(), input, context);
+
+    tokio::time::sleep(std::time::Duration::from_millis(100)).await;
+    handle.force_close();
+    assert!(matches!(
+        terminal.await,
+        ToolExecutionTerminal::OutcomeUnknown
+    ));
+
+    tokio::time::sleep(std::time::Duration::from_millis(1_100)).await;
+    assert!(
+        !marker.exists(),
+        "CommandGuard cleanup allowed a force-closed command to continue"
+    );
+
+    let output = bash
+        .execute(r#"{"command":"printf 'reused'"}"#, Default::default())
+        .await
+        .expect("workdir session remains reusable after cleanup");
+    assert_eq!(output.content.as_deref(), Some("reused"));
+}
+
 // Sanity: unused Path import guard
 const _: fn() -> &'static Path = || Path::new("/");
@@ -1244,6 +1244,7 @@ impl App {
                id,
                summary,
                output,
+                disposition: _,
                is_error,
            } => {
                self.latest_llm_wait_event = None;
@@ -1342,13 +1343,20 @@ impl App {
                    }
                }
            }
-            Event::CompactStart => {
-                self.blocks.push(Block::Compact(CompactEvent::Streaming {
-                    started_at: Instant::now(),
-                }));
+            Event::CompactStart { .. } => {
+                if self.last_streaming_compact_mut().is_none() {
+                    self.blocks.push(Block::Compact(CompactEvent::Streaming {
+                        started_at: Instant::now(),
+                    }));
+                }
            }
-            Event::CompactDone { new_segment_id } => {
+            Event::CompactDone { lifecycle } => {
                self.session_context_tokens = 0;
+                let new_segment_id = lifecycle
+                    .new_segment_id
+                    .as_deref()
+                    .and_then(|value| uuid::Uuid::parse_str(value).ok())
+                    .unwrap_or_default();
                if let Some(evt) = self.last_streaming_compact_mut() {
                    let elapsed_secs = match evt {
                        CompactEvent::Streaming { started_at } => {
@@ -1367,7 +1375,10 @@ impl App {
                    }));
                }
            }
-            Event::CompactFailed { error } => {
+            Event::CompactFailed { lifecycle } => {
+                let error = lifecycle
+                    .error
+                    .unwrap_or_else(|| "compaction failed".to_string());
                if let Some(evt) = self.last_streaming_compact_mut() {
                    let elapsed_secs = match evt {
                        CompactEvent::Streaming { started_at } => {
@@ -2486,7 +2497,7 @@ fn event_is_stale_after_rewind(event: &Event) -> bool {
        event,
        Event::Alert(_)
            | Event::MemoryWorker(_)
-            | Event::CompactStart
+            | Event::CompactStart { .. }
            | Event::CompactDone { .. }
            | Event::CompactFailed { .. }
            | Event::SegmentRotated { .. }
@@ -4076,13 +4087,34 @@ mod completion_flow_tests {
        }
    }

+    fn test_compaction_lifecycle(
+        state: protocol::CompactionLifecycleState,
+    ) -> protocol::CompactionLifecycle {
+        protocol::CompactionLifecycle {
+            schema_version: 2,
+            compaction_id: "compaction-test".into(),
+            revision: 1,
+            internal_worker: None,
+            state,
+            started_at_ms: 1,
+            ended_at_ms: None,
+            summary: None,
+            error: None,
+            new_segment_id: None,
+        }
+    }
+
    #[test]
    fn compact_done_replaces_live_block() {
        let mut app = App::new("test".into());
        let id = uuid::Uuid::parse_str("12345678-1234-5678-1234-567812345678").unwrap();

-        app.handle_worker_event(Event::CompactStart);
-        app.handle_worker_event(Event::CompactDone { new_segment_id: id });
+        app.handle_worker_event(Event::CompactStart {
+            lifecycle: test_compaction_lifecycle(protocol::CompactionLifecycleState::Running),
+        });
+        let mut lifecycle = test_compaction_lifecycle(protocol::CompactionLifecycleState::Done);
+        lifecycle.new_segment_id = Some(id.to_string());
+        app.handle_worker_event(Event::CompactDone { lifecycle });

        assert_eq!(compact_block_count(&app), 1);
        assert!(matches!(
@@ -4098,10 +4130,12 @@ mod completion_flow_tests {
    fn compact_failed_replaces_live_block() {
        let mut app = App::new("test".into());

-        app.handle_worker_event(Event::CompactStart);
-        app.handle_worker_event(Event::CompactFailed {
-            error: "provider 429".into(),
+        app.handle_worker_event(Event::CompactStart {
+            lifecycle: test_compaction_lifecycle(protocol::CompactionLifecycleState::Running),
        });
+        let mut lifecycle = test_compaction_lifecycle(protocol::CompactionLifecycleState::Failed);
+        lifecycle.error = Some("provider 429".into());
+        app.handle_worker_event(Event::CompactFailed { lifecycle });

        assert_eq!(compact_block_count(&app), 1);
        assert!(matches!(
@@ -4117,7 +4151,9 @@ mod completion_flow_tests {
    fn shutdown_marks_live_compact_incomplete() {
        let mut app = App::new("test".into());

-        app.handle_worker_event(Event::CompactStart);
+        app.handle_worker_event(Event::CompactStart {
+            lifecycle: test_compaction_lifecycle(protocol::CompactionLifecycleState::Running),
+        });
        app.handle_worker_event(Event::Shutdown);

        assert!(app.quit);
@@ -4208,9 +4244,9 @@ mod completion_flow_tests {
        let mut app = App::new("test".into());
        app.session_context_tokens = 42_000;

-        app.handle_worker_event(Event::CompactDone {
-            new_segment_id: uuid::Uuid::nil(),
-        });
+        let mut lifecycle = test_compaction_lifecycle(protocol::CompactionLifecycleState::Done);
+        lifecycle.new_segment_id = Some(uuid::Uuid::nil().to_string());
+        app.handle_worker_event(Event::CompactDone { lifecycle });

        assert_eq!(app.session_context_tokens, 0);
    }
@@ -1016,7 +1016,7 @@ fn handle_key(app: &mut App, key: KeyEvent) -> Option<Method> {
                app.clear_queued_inputs();
                Some(Method::Cancel)
            }
-            WorkerStatus::Idle => Some(Method::Shutdown),
+            WorkerStatus::Idle | WorkerStatus::Stopped => Some(Method::Shutdown),
        }),
        KeyCode::Char('d') if ctrl => {
            app.quit = true;
@@ -29,7 +29,6 @@ use ratatui::layout::{Constraint, Layout, Position, Rect};
 use ratatui::style::{Color, Modifier, Style};
 use ratatui::text::{Line, Span};
 use ratatui::widgets::{Block, Borders, Clear, Paragraph, Widget, Wrap};
-use serde::Serialize;
 use session_store::FsStore;
 use session_store::FsWorkerStore;
 use ticket::config::{GitBranchName, TicketConfig, TicketOrchestrationConfig};
@@ -70,10 +69,6 @@ use render::{PanelListRow, row_hit_boxes};

 const MAX_ENTRIES: usize = 50;
 const CLOSED_VISIBLE_ROWS: usize = 3;
-const ORCHESTRATOR_IDLE_QUEUE_NOTICE_PROMPT: &str = "panel.orchestrator_idle_queue_notice";
-const ORCHESTRATOR_QUEUE_ATTENTION_MAX_TICKETS: usize = 6;
-const ORCHESTRATOR_QUEUE_ATTENTION_MAX_TEXT_CHARS: usize = 120;
-const ORCHESTRATOR_QUEUE_ATTENTION_MAX_MESSAGE_CHARS: usize = 2_400;
 const SOCKET_OP_TIMEOUT: Duration = Duration::from_secs(3);
 const DASHBOARD_POLL_INTERVAL: Duration = Duration::from_millis(1_500);
 const TERMINAL_EVENT_POLL_INTERVAL: Duration = Duration::from_millis(100);
@@ -581,6 +576,7 @@ pub(crate) enum IntakeRegistryUpdate {
 pub(crate) struct ReadyTicketPlanningReturnRequest {
    workspace_root: PathBuf,
    ticket_id: String,
+    ticket_key: String,
    user_instruction: String,
    followup: ReadyTicketPlanningReturnFollowup,
 }
@@ -910,6 +906,7 @@ struct OrchestratorActiveWorkItem {
 #[derive(Debug, Clone, PartialEq, Eq)]
 struct OrchestratorQueuedWorkItem {
    id: String,
+    resource_key: Option<String>,
    title: String,
    classification: OrchestratorQueuedClassification,
    waiting_reason: Option<String>,
@@ -974,22 +971,6 @@ impl OrchestratorQueueAttentionNoticeResult {
    }
 }

-#[derive(Debug, Serialize)]
-struct OrchestratorQueueTemplateContext {
-    workspace: String,
-    actionable_tickets: Vec<OrchestratorQueueTemplateTicket>,
-    waiting_tickets: Vec<OrchestratorQueueTemplateTicket>,
-    omitted_ticket_count: usize,
-}
-
-#[derive(Debug, Serialize)]
-struct OrchestratorQueueTemplateTicket {
-    id: String,
-    title: String,
-    classification: &'static str,
-    waiting_reason: Option<String>,
-}
-
 #[derive(Debug, Clone, PartialEq, Eq)]
 struct PanelRowHitBox {
    rect: Rect,
@@ -1325,7 +1306,16 @@ impl DashboardApp {
        if self.orchestrator_work_set.is_empty() {
            self.refresh_orchestrator_work_set();
        }
-        let notice = orchestrator_queue_attention_notice(&self.panel, &self.orchestrator_work_set)?;
+        let notice = match orchestrator_queue_attention_notice(&self.orchestrator_work_set) {
+            Ok(Some(notice)) => notice,
+            Ok(None) => return None,
+            Err(error) => {
+                self.notice = Some(format!(
+                    "Orchestrator queued-work attention not delivered: {error}"
+                ));
+                return None;
+            }
+        };
        if self
            .orchestrator_queue_attention
            .as_ref()
@@ -2042,11 +2032,18 @@ impl DashboardApp {
            return None;
        };
        let ticket_id = ticket.id.clone();
+        let ticket_key = match required_ticket_handoff_key(ticket.resource_key.as_deref()) {
+            Ok(ticket_key) => ticket_key.to_string(),
+            Err(error) => {
+                self.notice = Some(error);
+                return None;
+            }
+        };
        let mut context =
            TicketRoleLaunchContext::new(current_workspace_root(), TicketRole::Intake);
        context.ticket = Some(TicketRef::id(ticket_id.clone()));
        context.user_instruction = Some(format!(
-            "Continue Intake for existing Ticket {ticket_id}. Do not create a duplicate Ticket unless the user explicitly requests one. Read ShowTicket body/thread/artifacts before making routing or requirements decisions."
+            "Continue Intake for existing Ticket {ticket_key}. Do not create a duplicate Ticket unless the user explicitly requests one. Read ShowTicket body/thread/artifacts before making routing or requirements decisions."
        ));
        let store = match PanelRegistryStore::default_for_workspace(&context.workspace_root) {
            Ok(store) => store,
@@ -2059,7 +2056,7 @@ impl DashboardApp {
            Ok(Some(claim)) => {
                let status = local_claim_status_for_pod(&claim.worker_name, &self.list);
                self.notice = Some(existing_ticket_claim_notice(
-                    &ticket_id,
+                    &ticket_key,
                    &claim.worker_name,
                    status,
                ));
@@ -2087,7 +2084,7 @@ impl DashboardApp {
        self.sending = true;
        self.notice = Some(format!(
            "Launching Ticket Intake for {} as {}…",
-            ticket_id, planned.worker_name
+            ticket_key, planned.worker_name
        ));
        Some(IntakeLaunchRequest {
            context,
@@ -2158,10 +2155,17 @@ impl DashboardApp {
            return None;
        };
        let ticket_id = ticket.id.clone();
+        let ticket_key = match required_ticket_handoff_key(ticket.resource_key.as_deref()) {
+            Ok(ticket_key) => ticket_key.to_string(),
+            Err(error) => {
+                self.notice = Some(error);
+                return None;
+            }
+        };
        if ticket.workflow_state != TicketWorkflowState::Ready {
            self.notice = Some(format!(
                "Ticket {} is {}; expected ready before returning to planning.",
-                ticket_id,
+                ticket_key,
                ticket.workflow_state.as_str()
            ));
            return None;
@@ -2213,7 +2217,7 @@ impl DashboardApp {
                    TicketRoleLaunchContext::new(workspace_root.clone(), TicketRole::Intake);
                context.ticket = Some(TicketRef::id(ticket_id.clone()));
                context.user_instruction = Some(build_ready_ticket_refinement_launch_instruction(
-                    &ticket_id,
+                    &ticket_key,
                    &user_instruction,
                ));
                let peer_registration = self.prepare_intake_peer_registration(&mut context);
@@ -2237,11 +2241,12 @@ impl DashboardApp {
        self.sending = true;
        self.notice = Some(format!(
            "Returning ready Ticket {} to planning for refinement…",
-            ticket_id
+            ticket_key
        ));
        Some(ReadyTicketPlanningReturnRequest {
            workspace_root,
            ticket_id,
+            ticket_key,
            user_instruction,
            followup,
        })
@@ -3645,6 +3650,7 @@ fn derive_orchestrator_work_set(
                };
            Some(OrchestratorQueuedWorkItem {
                id: ticket.id.clone(),
+                resource_key: ticket.resource_key.clone(),
                title: ticket.title.clone(),
                classification,
                waiting_reason,
@@ -3728,72 +3734,46 @@ fn orchestrator_work_set_fingerprint(
 }

 fn orchestrator_queue_attention_notice(
-    panel: &WorkspacePanelViewModel,
    work_set: &OrchestratorWorkSet,
-) -> Option<OrchestratorQueueAttentionNotice> {
+) -> Result<Option<OrchestratorQueueAttentionNotice>, &'static str> {
    if work_set.has_active_inprogress() {
-        return None;
+        return Ok(None);
    }
    let actionable = work_set.actionable_queued();
    if actionable.is_empty() {
-        return None;
+        return Ok(None);
    }
    let waiting = work_set
        .queued
        .iter()
-        .filter(|item| item.waiting_reason.is_some())
-        .collect::<Vec<_>>();
-    let ticket_count = actionable.len() + waiting.len();
-    let actionable_tickets = actionable
-        .iter()
-        .take(ORCHESTRATOR_QUEUE_ATTENTION_MAX_TICKETS)
-        .map(|item| orchestrator_queue_template_ticket(item))
-        .collect::<Vec<_>>();
-    let remaining_capacity =
-        ORCHESTRATOR_QUEUE_ATTENTION_MAX_TICKETS.saturating_sub(actionable_tickets.len());
-    let waiting_tickets = waiting
-        .iter()
-        .take(remaining_capacity)
-        .map(|item| orchestrator_queue_template_ticket(item))
-        .collect::<Vec<_>>();
-    let rendered =
-        render_orchestrator_queue_attention_template(&OrchestratorQueueTemplateContext {
-            workspace: bounded_progress_text(
-                &panel.header.workspace_label,
-                ORCHESTRATOR_QUEUE_ATTENTION_MAX_TEXT_CHARS,
-            ),
-            actionable_tickets,
-            waiting_tickets,
-            omitted_ticket_count: ticket_count
-                .saturating_sub(ORCHESTRATOR_QUEUE_ATTENTION_MAX_TICKETS),
+        .filter(|item| item.waiting_reason.is_some());
+    let tickets = actionable
+        .into_iter()
+        .chain(waiting)
+        .map(|item| {
+            let resource_key = item
+                .resource_key
+                .clone()
+                .ok_or("queued Ticket is missing its required resource key")?;
+            worker::OrchestratorQueueAttentionTicket::new(resource_key, item.title.clone())
+                .map_err(|_| "queued Ticket has an invalid resource key")
        })
-        .ok()?;
-    let message = bounded_progress_text(&rendered, ORCHESTRATOR_QUEUE_ATTENTION_MAX_MESSAGE_CHARS);
+        .collect::<Result<Vec<_>, _>>()?;
+    let context = worker::OrchestratorQueueAttentionContext::new(tickets);
+    let message = render_orchestrator_queue_attention_template(&context)
+        .map_err(|_| "queued-work attention prompt rendering failed")?;
    let fingerprint = format!("idle-queue:{}", work_set.fingerprint);
-    Some(OrchestratorQueueAttentionNotice {
+    Ok(Some(OrchestratorQueueAttentionNotice {
        message,
        fingerprint,
-    })
-}
-
-fn orchestrator_queue_template_ticket(
-    item: &&OrchestratorQueuedWorkItem,
-) -> OrchestratorQueueTemplateTicket {
-    OrchestratorQueueTemplateTicket {
-        id: bounded_progress_text(&item.id, ORCHESTRATOR_QUEUE_ATTENTION_MAX_TEXT_CHARS),
-        title: bounded_progress_text(&item.title, ORCHESTRATOR_QUEUE_ATTENTION_MAX_TEXT_CHARS),
-        classification: item.classification.as_str(),
-        waiting_reason: item.waiting_reason.as_ref().map(|reason| {
-            bounded_progress_text(reason, ORCHESTRATOR_QUEUE_ATTENTION_MAX_TEXT_CHARS)
-        }),
-    }
+    }))
 }

 fn render_orchestrator_queue_attention_template(
-    context: &OrchestratorQueueTemplateContext,
+    context: &worker::OrchestratorQueueAttentionContext,
 ) -> Result<String, worker::CatalogError> {
    worker::PromptCatalog::builtins_only()?
-        .render_serializable(ORCHESTRATOR_IDLE_QUEUE_NOTICE_PROMPT, context)
+        .orchestrator_queue_attention(worker::OrchestratorQueueAttentionPrompt::Tui, context)
 }

 fn orchestrator_work_set_detail(
@@ -3918,21 +3898,35 @@ fn bounded_refinement_instruction(input: &str) -> String {
        .to_string()
 }

-fn build_ready_ticket_refinement_thread_body(ticket_id: &str, instruction: &str) -> String {
+fn required_ticket_handoff_key(resource_key: Option<&str>) -> Result<&str, String> {
+    let resource_key = resource_key.ok_or_else(|| {
+        "Ticket handoff is unavailable because the canonical T-* resource key is missing. Refresh the panel and retry."
+            .to_string()
+    })?;
+    let sequence = resource_key.strip_prefix("T-").filter(|sequence| {
+        !sequence.is_empty() && sequence.bytes().all(|byte| byte.is_ascii_digit())
+    });
+    sequence.map(|_| resource_key).ok_or_else(|| {
+        "Ticket handoff is unavailable because the canonical T-* resource key is invalid. Refresh the panel and retry."
+            .to_string()
+    })
+}
+
+fn build_ready_ticket_refinement_thread_body(ticket_key: &str, instruction: &str) -> String {
    format!(
-        "Panel returned ready Ticket {ticket_id} to planning for requirements sync. This is not Queue routing and must not start implementation.\n\n## User refinement instruction\n\n{instruction}\n"
+        "Panel returned ready Ticket {ticket_key} to planning for requirements sync. This is not Queue routing and must not start implementation.\n\n## User refinement instruction\n\n{instruction}\n"
    )
 }

-fn build_ready_ticket_refinement_launch_instruction(ticket_id: &str, instruction: &str) -> String {
+fn build_ready_ticket_refinement_launch_instruction(ticket_key: &str, instruction: &str) -> String {
    format!(
-        "Continue Ticket Intake / requirements sync for existing Ticket {ticket_id}. The Panel has returned the Ticket from ready to planning; do not queue the Ticket, do not route implementation, and do not create a duplicate unless the user explicitly asks for one. Read ShowTicket body/thread/artifacts before making requirements or readiness decisions.\n\nUser refinement instruction:\n\n{instruction}"
+        "Continue Ticket Intake / requirements sync for existing Ticket {ticket_key}. The Panel has returned the Ticket from ready to planning; do not queue the Ticket, do not route implementation, and do not create a duplicate unless the user explicitly asks for one. Read ShowTicket body/thread/artifacts before making requirements or readiness decisions.\n\nUser refinement instruction:\n\n{instruction}"
    )
 }

-fn build_ready_ticket_refinement_notify(ticket_id: &str, instruction: &str) -> String {
+fn build_ready_ticket_refinement_notify(ticket_key: &str, instruction: &str) -> String {
    format!(
-        "Ticket {ticket_id} was returned from ready to planning from the Panel for requirements sync. Continue Intake/refinement only; do not Queue or route implementation. Read the Ticket thread for the recorded state change and user instruction.\n\nUser refinement instruction:\n\n{instruction}"
+        "Ticket {ticket_key} was returned from ready to planning from the Panel for requirements sync. Continue Intake/refinement only; do not Queue or route implementation. Read the Ticket thread for the recorded state change and user instruction.\n\nUser refinement instruction:\n\n{instruction}"
    )
 }

@@ -3961,10 +3955,12 @@ async fn dispatch_ready_ticket_planning_return(
    let ticket = backend
        .show(id.clone())
        .map_err(|error| TicketActionError::Ticket(error.to_string()))?;
+    let ticket_key =
+        required_ticket_handoff_key(Some(&request.ticket_key)).map_err(TicketActionError::Stale)?;
    if ticket.meta.workflow_state != TicketWorkflowState::Ready {
        return Err(TicketActionError::Stale(format!(
            "Ticket {} is {}; expected ready before returning it to planning. Refresh the panel and retry if appropriate.",
-            ticket.meta.id,
+            ticket_key,
            ticket.meta.workflow_state.as_str()
        )));
    }
@@ -3973,7 +3969,7 @@ async fn dispatch_ready_ticket_planning_return(
        TicketWorkflowState::Planning.as_str(),
        "panel_return_to_planning",
        MarkdownText::from(build_ready_ticket_refinement_thread_body(
-            &ticket.meta.id,
+            ticket_key,
            &request.user_instruction,
        )),
    );
@@ -3987,7 +3983,7 @@ async fn dispatch_ready_ticket_planning_return(
            ReadyTicketPlanningReturnOutcome {
                notice: format!(
                    "Ticket {} returned to planning for refinement; launching Ticket Intake…",
-                    ticket.meta.id
+                    ticket_key
                ),
                followup: ReadyTicketPlanningReturnAfterMutation::LaunchIntake(request),
            }
@@ -3997,19 +3993,19 @@ async fn dispatch_ready_ticket_planning_return(
            socket_path,
        } => {
            let message =
-                build_ready_ticket_refinement_notify(&ticket.meta.id, &request.user_instruction);
+                build_ready_ticket_refinement_notify(ticket_key, &request.user_instruction);
            match send_notify_only(&socket_path, message, true).await {
                Ok(()) => ReadyTicketPlanningReturnOutcome {
                    notice: format!(
                        "Ticket {} returned to planning for refinement; notified live Intake Worker {}.",
-                        ticket.meta.id, worker_name
+                        ticket_key, worker_name
                    ),
                    followup: ReadyTicketPlanningReturnAfterMutation::None,
                },
                Err(error) => ReadyTicketPlanningReturnOutcome {
                    notice: bounded_panel_diagnostic(format!(
                        "Ticket {} returned to planning and instruction was recorded, but notifying Intake Worker {} failed: {}",
-                        ticket.meta.id, worker_name, error
+                        ticket_key, worker_name, error
                    )),
                    followup: ReadyTicketPlanningReturnAfterMutation::None,
                },
@@ -4020,7 +4016,7 @@ async fn dispatch_ready_ticket_planning_return(
            ReadyTicketPlanningReturnOutcome {
                notice: format!(
                    "Ticket {} returned to planning for refinement; opening/restoring claimed Intake Worker {}…",
-                    ticket.meta.id, worker_name
+                    ticket_key, worker_name
                ),
                followup: ReadyTicketPlanningReturnAfterMutation::OpenClaim(request),
            }
@@ -4029,7 +4025,7 @@ async fn dispatch_ready_ticket_planning_return(
            ReadyTicketPlanningReturnOutcome {
                notice: bounded_panel_diagnostic(format!(
                    "Ticket {} returned to planning and instruction was recorded, but Intake launch was not attempted because existing Intake claim {} is stale; inspect or clear the local claim before launching another Intake Worker.",
-                    ticket.meta.id, worker_name
+                    ticket_key, worker_name
                )),
                followup: ReadyTicketPlanningReturnAfterMutation::None,
            }
@@ -5204,6 +5200,7 @@ fn row_status_label(entry: &WorkerListEntry) -> (&'static str, Style) {
                    .fg(Color::Cyan)
                    .add_modifier(Modifier::BOLD),
            ),
+            Some(WorkerStatus::Stopped) => ("live stopped", Style::default().fg(Color::DarkGray)),
            None => ("live", Style::default().fg(Color::DarkGray)),
        };
    }
@@ -390,6 +390,7 @@ fn planning_return_request(
    ReadyTicketPlanningReturnRequest {
        workspace_root: temp.path().to_path_buf(),
        ticket_id,
+        ticket_key: "T-482".to_string(),
        user_instruction: instruction.to_string(),
        followup: ReadyTicketPlanningReturnFollowup::BlockedByStaleClaim {
            worker_name: "stale-intake".to_string(),
@@ -494,6 +495,7 @@ fn ready_ticket_intake_enter_prepares_planning_return_not_queue_or_generic_launc
    };

    assert_eq!(request.ticket_id, "20260608-000123-ready");
+    assert_eq!(request.ticket_key, "T-1");
    assert_eq!(request.user_instruction, "clarify expected behavior");
    assert!(matches!(
        request.followup,
@@ -515,6 +517,7 @@ async fn planning_return_with_launch_followup_changes_state_before_launch_follow
    let request = ReadyTicketPlanningReturnRequest {
        workspace_root: temp.path().to_path_buf(),
        ticket_id: ticket_id.clone(),
+        ticket_key: "T-482".to_string(),
        user_instruction: "launch intake after state change".to_string(),
        followup: ReadyTicketPlanningReturnFollowup::LaunchIntake(IntakeLaunchRequest {
            context: TicketRoleLaunchContext::new(temp.path().to_path_buf(), TicketRole::Intake),
@@ -2969,7 +2972,7 @@ fn dashboard_empty_enter_on_non_openable_row_reports_open_diagnostic() {
 }

 #[test]
-fn idle_orchestrator_gets_bounded_attention_for_new_queued_work() {
+fn idle_orchestrator_gets_sanitized_attention_for_new_queued_work() {
    let mut app = ticket_enabled_app(vec![live_info("test-orchestrator", WorkerStatus::Idle)]);
    app.panel.rows = vec![panel_test_ticket_row(
        "00001QUEUE",
@@ -2989,11 +2992,87 @@ fn idle_orchestrator_gets_bounded_attention_for_new_queued_work() {
        request
            .notice
            .message
-            .starts_with("Workspace Dashboard observed")
+            .starts_with("Queued Tickets require attention:")
    );
-    assert!(request.notice.message.contains("00001QUEUE"));
-    assert!(request.notice.message.contains("new_queued"));
-    assert!(request.notice.message.contains("queued -> inprogress"));
+    assert!(request.notice.message.contains("- T-1 — Queued work"));
+    assert!(
+        request
+            .notice
+            .message
+            .contains("Reread the current Ticket state before acting")
+    );
+    assert!(
+        !request
+            .notice
+            .message
+            .contains(&app.panel.header.workspace_label)
+    );
+    for hidden in [
+        "00001QUEUE",
+        "Workspace:",
+        "workspace_id",
+        "new_queued",
+        "bounded",
+        "queued -> inprogress",
+    ] {
+        assert!(!request.notice.message.contains(hidden), "leaked {hidden}");
+    }
+}
+
+#[test]
+fn queued_attention_missing_resource_key_fails_closed_with_panel_notice() {
+    let mut app = ticket_enabled_app(vec![live_info("test-orchestrator", WorkerStatus::Idle)]);
+    let mut row = panel_test_ticket_row(
+        "00001QUEUE",
+        "Queued work",
+        ActionPriority::Background,
+        NextUserAction::Wait,
+        "queued",
+    );
+    row.ticket.as_mut().unwrap().resource_key = None;
+    app.panel.rows = vec![row];
+    app.refresh_orchestrator_work_set();
+
+    assert!(app.prepare_orchestrator_queue_attention_notice().is_none());
+    assert_eq!(
+        app.notice.as_deref(),
+        Some(
+            "Orchestrator queued-work attention not delivered: queued Ticket is missing its required resource key"
+        )
+    );
+}
+
+#[test]
+fn queued_attention_truncates_only_when_tickets_are_omitted() {
+    let mut app = ticket_enabled_app(vec![live_info("test-orchestrator", WorkerStatus::Idle)]);
+    app.panel.rows = (1..=worker::OrchestratorQueueAttentionContext::MAX_TICKETS + 1)
+        .map(|index| {
+            let mut row = panel_test_ticket_row(
+                &format!("opaque-{index}"),
+                &format!("Queued work {index}"),
+                ActionPriority::Background,
+                NextUserAction::Wait,
+                "queued",
+            );
+            row.ticket.as_mut().unwrap().resource_key = Some(format!("T-{index}"));
+            row
+        })
+        .collect();
+    app.refresh_orchestrator_work_set();
+
+    let request = app
+        .prepare_orchestrator_queue_attention_notice()
+        .expect("bounded queued-work attention");
+
+    assert!(request.notice.message.contains("- T-20 — Queued work 20"));
+    assert!(!request.notice.message.contains("T-21"));
+    assert!(
+        request
+            .notice
+            .message
+            .contains("were omitted from this notice: 1")
+    );
+    assert!(!request.notice.message.contains("opaque-"));
 }

 #[test]
@@ -3083,7 +3162,9 @@ fn planned_queued_prompts_when_active_work_clears() {
        .prepare_orchestrator_queue_attention_notice()
        .expect("planned queued work should prompt after active work clears");

-    assert!(request.notice.message.contains("planned_queued"));
+    assert!(request.notice.message.contains("- T-1 — Queued work"));
+    assert!(!request.notice.message.contains("planned_queued"));
+    assert!(!request.notice.message.contains("00001QUEUE"));
    assert!(
        !request
            .notice
@@ -3138,8 +3219,9 @@ fn rediscovered_queued_work_is_actionable_when_session_work_set_is_empty() {
        .prepare_orchestrator_queue_attention_notice()
        .expect("queued ticket state should be rediscovered safely");

-    assert!(request.notice.message.contains("new_queued"));
-    assert!(request.notice.message.contains("00001QUEUE"));
+    assert!(request.notice.message.contains("- T-1 — Queued work"));
+    assert!(!request.notice.message.contains("new_queued"));
+    assert!(!request.notice.message.contains("00001QUEUE"));
 }

 #[test]
@@ -3425,6 +3507,27 @@ fn ticket_action_error_records_f2_diagnostic_details() {
    assert!(!app.panel_diagnostic_open);
 }

+#[test]
+fn ready_ticket_refinement_projection_uses_only_canonical_resource_key() {
+    const INTERNAL_ID: &str = "00001KZVNXFNK";
+    let thread = build_ready_ticket_refinement_thread_body("T-482", "Clarify rollback.");
+    let launch = build_ready_ticket_refinement_launch_instruction("T-482", "Clarify rollback.");
+    let notify = build_ready_ticket_refinement_notify("T-482", "Clarify rollback.");
+
+    for projection in [&thread, &launch, &notify] {
+        assert!(projection.contains("T-482"));
+        assert!(!projection.contains(INTERNAL_ID));
+    }
+}
+
+#[test]
+fn ticket_handoff_fails_closed_without_canonical_resource_key() {
+    assert_eq!(required_ticket_handoff_key(Some("T-482")), Ok("T-482"));
+    for invalid in [None, Some(""), Some("00001KZVNXFNK"), Some("T-key")] {
+        assert!(required_ticket_handoff_key(invalid).is_err());
+    }
+}
+
 fn plain_line(line: &Line<'_>) -> String {
    line.spans
        .iter()
@@ -1530,6 +1530,7 @@ fn worker_status_label(entry: &WorkerListEntry) -> &'static str {
            Some(WorkerStatus::Idle) => "live idle",
            Some(WorkerStatus::Running) => "live running",
            Some(WorkerStatus::Paused) => "live paused",
+            Some(WorkerStatus::Stopped) => "live stopped",
            None => "live",
        };
    }
@@ -251,14 +251,8 @@ impl DelegatingWorkdirSession {
        self.ensure_path(path, WorkdirDelegationPermission::Write)
    }

-    fn ensure_command(&self, starting: bool) -> Result<(), WorkdirError> {
-        self.ensure_capability(WorkdirSessionCapability::Command, "command execution")?;
-        if starting && self.has_active_write_lease() {
-            return Err(WorkdirError::Denied(
-                "command execution is denied while a child holds a write delegation".into(),
-            ));
-        }
-        Ok(())
+    fn ensure_command(&self) -> Result<(), WorkdirError> {
+        self.ensure_capability(WorkdirSessionCapability::Command, "command execution")
    }

    fn ensure_parent_write_available(&self, path: &FsPath) -> Result<(), WorkdirError> {
@@ -281,20 +275,6 @@ impl DelegatingWorkdirSession {
        }
    }

-    fn has_active_write_lease(&self) -> bool {
-        let mut leases = self
-            .child_write_leases
-            .lock()
-            .expect("workdir delegation lease mutex poisoned");
-        leases.retain(|_, lease| lease.validity.upgrade().is_some_and(|v| v.is_active()));
-        leases.values().any(|lease| {
-            lease
-                .rules
-                .iter()
-                .any(|rule| rule.permission == WorkdirDelegationPermission::Write)
-        })
-    }
-
    fn validate_delegation_rules(
        &self,
        rules: &[WorkdirDelegationRule],
@@ -503,12 +483,12 @@ impl WorkdirSession for DelegatingWorkdirSession {
    }

    async fn start_command(&self, request: CommandRequest) -> Result<CommandHandle, WorkdirError> {
-        self.ensure_command(true)?;
+        self.ensure_command()?;
        self.source.start_command(request).await
    }

    async fn command_status(&self, handle: CommandHandle) -> Result<CommandStatus, WorkdirError> {
-        self.ensure_command(false)?;
+        self.ensure_command()?;
        self.source.command_status(handle).await
    }

@@ -516,12 +496,12 @@ impl WorkdirSession for DelegatingWorkdirSession {
        &self,
        request: CommandOutputRequest,
    ) -> Result<CommandOutput, WorkdirError> {
-        self.ensure_command(false)?;
+        self.ensure_command()?;
        self.source.command_output(request).await
    }

    async fn cancel_command(&self, handle: CommandHandle) -> Result<(), WorkdirError> {
-        self.ensure_command(false)?;
+        self.ensure_command()?;
        self.source.cancel_command(handle).await
    }

@@ -753,6 +733,31 @@ mod tests {
        }
    }

+    async fn run_command(
+        session: &WorkdirSessionHandle,
+        command: impl Into<String>,
+        tool_call_id: impl Into<String>,
+    ) -> CommandOutput {
+        let handle = session
+            .start_command(CommandRequest {
+                command: command.into(),
+                timeout_secs: 5,
+                output_limit: 1024,
+                tool_call_id: Some(tool_call_id.into()),
+            })
+            .await
+            .unwrap();
+        session
+            .command_output(CommandOutputRequest {
+                handle,
+                cursor: 0,
+                limit: 1024,
+                wait: true,
+            })
+            .await
+            .unwrap()
+    }
+
    #[tokio::test]
    async fn delegation_capable_session_forwards_command_telemetry() {
        let root = TempDir::new().unwrap();
@@ -846,6 +851,18 @@ mod tests {
        );
        assert!(child.scoped_session.subscribe_command_events().is_none());
        assert!(child.scoped_session.command_snapshot().is_empty());
+        assert!(matches!(
+            child
+                .scoped_session
+                .start_command(CommandRequest {
+                    command: "printf denied".into(),
+                    timeout_secs: 5,
+                    output_limit: 1024,
+                    tool_call_id: Some("read-only-command".into()),
+                })
+                .await,
+            Err(WorkdirError::Denied(_))
+        ));
    }

    #[cfg(unix)]
@@ -924,7 +941,7 @@ mod tests {
    }

    #[tokio::test]
-    async fn write_lease_blocks_parent_region_until_release() {
+    async fn write_lease_keeps_typed_parent_writes_exclusive_without_blocking_commands() {
        let root = TempDir::new().unwrap();
        fs::create_dir_all(root.path().join("leased")).unwrap();
        fs::create_dir_all(root.path().join("other")).unwrap();
@@ -938,37 +955,24 @@ mod tests {
                .capabilities
                .supports(WorkdirSessionCapability::Command)
        );
-        let command = child
-            .scoped_session
-            .start_command(CommandRequest {
-                command: "printf child-command".into(),
-                timeout_secs: 5,
-                output_limit: 1024,
-                tool_call_id: Some("delegated-child-command".into()),
-            })
-            .await
-            .unwrap();
-        let command_output = child
-            .scoped_session
-            .command_output(CommandOutputRequest {
-                handle: command,
-                cursor: 0,
-                limit: 1024,
-                wait: true,
-            })
-            .await
-            .unwrap();
-        assert_eq!(command_output.content, "child-command");
-        assert!(
-            parent
-                .start_command(CommandRequest {
-                    command: "printf parent-command".into(),
-                    timeout_secs: 5,
-                    output_limit: 1024,
-                    tool_call_id: Some("blocked-parent-command".into()),
-                })
-                .await
-                .is_err()
+        let child_output = run_command(
+            &child.scoped_session,
+            "printf child-command",
+            "delegated-child-command",
+        )
+        .await;
+        assert_eq!(child_output.content, "child-command");
+        let parent_output = run_command(
+            &parent,
+            "printf parent-write > leased/from-command; printf parent-command",
+            "parent-command-during-child-write",
+        )
+        .await;
+        assert_eq!(parent_output.status, CommandStatus::Completed);
+        assert_eq!(parent_output.content, "parent-command");
+        assert_eq!(
+            fs::read_to_string(root.path().join("leased/from-command")).unwrap(),
+            "parent-write"
        );

        assert!(matches!(
@@ -982,6 +986,18 @@ mod tests {
            .await
            .unwrap();
        child.release();
+        assert!(matches!(
+            child
+                .scoped_session
+                .start_command(CommandRequest {
+                    command: "printf revoked".into(),
+                    timeout_secs: 5,
+                    output_limit: 1024,
+                    tool_call_id: Some("revoked-child-command".into()),
+                })
+                .await,
+            Err(WorkdirError::SessionClosed)
+        ));
        parent
            .write(write("leased/parent", "parent"))
            .await
@@ -1033,6 +1049,78 @@ mod tests {
        ));
    }

+    #[tokio::test]
+    async fn nested_write_leases_do_not_block_command_capable_ancestors() {
+        let root = TempDir::new().unwrap();
+        fs::create_dir_all(root.path().join("docs/sub")).unwrap();
+        let root_session = session(root.path());
+        let child = root_session
+            .delegate(request("docs", WorkdirDelegationPermission::Write))
+            .await
+            .unwrap();
+        let nested = child
+            .scoped_session
+            .delegate(request("docs/sub", WorkdirDelegationPermission::Write))
+            .await
+            .unwrap();
+
+        for (session, label) in [
+            (&root_session, "root"),
+            (&child.scoped_session, "child"),
+            (&nested.scoped_session, "nested"),
+        ] {
+            let output = run_command(
+                session,
+                format!("printf {label}"),
+                format!("{label}-command-during-nested-write"),
+            )
+            .await;
+            assert_eq!(output.status, CommandStatus::Completed);
+            assert_eq!(output.content, label);
+        }
+
+        assert!(matches!(
+            root_session.write(write("docs/root", "blocked")).await,
+            Err(WorkdirError::Denied(_))
+        ));
+        assert!(matches!(
+            child
+                .scoped_session
+                .write(write("sub/child", "blocked"))
+                .await,
+            Err(WorkdirError::Denied(_))
+        ));
+        nested
+            .scoped_session
+            .write(write("nested", "allowed"))
+            .await
+            .unwrap();
+
+        nested.release();
+        child.release();
+    }
+
+    #[tokio::test]
+    async fn reapplied_write_delegation_chain_forwards_command_lifecycle() {
+        let root = TempDir::new().unwrap();
+        fs::create_dir_all(root.path().join("delegated")).unwrap();
+        let applied = apply_delegation_chain(
+            session(root.path()),
+            [request("delegated", WorkdirDelegationPermission::Write)],
+        )
+        .await
+        .unwrap();
+
+        let output = run_command(
+            &applied.scoped_session,
+            "printf reapplied",
+            "reapplied-command",
+        )
+        .await;
+        assert_eq!(output.status, CommandStatus::Completed);
+        assert_eq!(output.content, "reapplied");
+    }
+
    #[tokio::test]
    async fn applied_chain_cannot_replace_outer_provider_attenuation() {
        let root = TempDir::new().unwrap();
@@ -1077,6 +1165,17 @@ mod tests {
            .unwrap();

        parent.close().await.unwrap();
+        assert!(matches!(
+            parent
+                .start_command(CommandRequest {
+                    command: "printf closed".into(),
+                    timeout_secs: 5,
+                    output_limit: 1024,
+                    tool_call_id: Some("closed-parent-command".into()),
+                })
+                .await,
+            Err(WorkdirError::SessionClosed)
+        ));
        assert!(matches!(
            child.scoped_session.read(read("a")).await,
            Err(WorkdirError::SessionClosed)
@@ -28,7 +28,9 @@ pub use fs_operation::{
    GlobResult, GrepOutputMode, GrepRequest, GrepResult, ListEntry, ListRequest, ListResult,
    ReadRequest, ReadResult, StatRequest, StatResult, WriteRequest, WriteResult,
 };
-pub use local::{LocalWorkdirSession, SymlinkInfo, direct_symlink, first_symlink};
+pub use local::{
+    LocalWorkdirSession, SymlinkInfo, WorkdirSessionResource, direct_symlink, first_symlink,
+};
 pub use operation::*;

 /// Persistent, opaque identity of one materialized Workdir.
@@ -8,7 +8,8 @@
 //! `LocalWorkdirSession` is cheap to clone (`Arc` inside). Tool-specific session
 //! state, such as read-before-edit tracking, remains owned by the tool layer.

-use std::collections::HashMap;
+use std::collections::{BTreeMap, HashMap};
+use std::fmt::Debug;
 #[cfg(test)]
 use std::io::Write as _;
 use std::io::{Read as _, Seek as _, SeekFrom};
@@ -228,6 +229,8 @@ struct LocalWorkdirSessionInner {
    next_command_id: AtomicU64,
    commands: Mutex<HashMap<String, LocalCommand>>,
    command_telemetry: CommandTelemetry,
+    command_environment: BTreeMap<String, String>,
+    resources: StdMutex<Vec<Arc<dyn WorkdirSessionResource>>>,
 }

 impl Drop for LocalWorkdirSessionInner {
@@ -242,6 +245,9 @@ impl Drop for LocalWorkdirSessionInner {
    }
 }

+pub trait WorkdirSessionResource: Debug + Send + Sync {}
+impl<T> WorkdirSessionResource for T where T: Debug + Send + Sync {}
+
 /// Scope-aware filesystem handle. Clone-cheap (`Arc` inside).
 ///
 /// The wrapped [`SharedScope`] is shared with every clone of this
@@ -318,6 +324,26 @@ impl LocalWorkdirSession {
        cwd: PathBuf,
        scope: SharedScope,
        capabilities: WorkdirSessionCapabilities,
+    ) -> Self {
+        Self::materialized_bound_with_environment(
+            workdir,
+            root,
+            cwd,
+            scope,
+            capabilities,
+            BTreeMap::new(),
+            Vec::new(),
+        )
+    }
+
+    pub fn materialized_bound_with_environment(
+        workdir: Workdir,
+        root: PathBuf,
+        cwd: PathBuf,
+        scope: SharedScope,
+        capabilities: WorkdirSessionCapabilities,
+        command_environment: BTreeMap<String, String>,
+        resources: Vec<Arc<dyn WorkdirSessionResource>>,
    ) -> Self {
        Self {
            inner: Arc::new(LocalWorkdirSessionInner {
@@ -331,6 +357,8 @@ impl LocalWorkdirSession {
                next_command_id: AtomicU64::new(1),
                commands: Mutex::new(HashMap::new()),
                command_telemetry: CommandTelemetry::new(),
+                command_environment,
+                resources: StdMutex::new(resources),
            }),
        }
    }
@@ -669,9 +697,18 @@ impl WorkdirSession for LocalWorkdirSession {
        let (completion_tx, completion) = watch::channel(false);
        let command_id = handle.0.clone();
        let telemetry = self.inner.command_telemetry.clone();
+        let command_environment = self.inner.command_environment.clone();
        let (cancel, cancel_rx) = watch::channel(false);
        let task = tokio::spawn(async move {
-            let output = run_command(cwd, request, command_id, telemetry, cancel_rx).await;
+            let output = run_command(
+                cwd,
+                request,
+                command_id,
+                telemetry,
+                command_environment,
+                cancel_rx,
+            )
+            .await;
            let _ = completion_tx.send(true);
            output
        });
@@ -840,6 +877,9 @@ impl WorkdirSession for LocalWorkdirSession {
                LocalCommand::Completed(_) => {}
            }
        }
+        if let Ok(mut resources) = self.inner.resources.lock() {
+            resources.clear();
+        }
        Ok(())
    }
 }
@@ -909,6 +949,7 @@ async fn run_command(
    request: CommandRequest,
    command_id: String,
    telemetry: CommandTelemetry,
+    command_environment: BTreeMap<String, String>,
    mut cancel: watch::Receiver<bool>,
 ) -> Result<CommandOutput, WorkdirError> {
    let stdout = tempfile::NamedTempFile::new().map_err(|error| WorkdirError::io(&cwd, error))?;
@@ -925,6 +966,7 @@ async fn run_command(
        .arg("-c")
        .arg(&request.command)
        .current_dir(&cwd)
+        .envs(command_environment)
        .stdin(Stdio::null())
        .stdout(Stdio::from(stdout_file))
        .stderr(Stdio::from(stderr_file))
@@ -2319,6 +2361,31 @@ mod tests {
        assert_eq!(terminal, Some((handle.0, CommandStatus::TimedOut, None)));
    }

+    #[tokio::test]
+    async fn closing_session_releases_runtime_resources() {
+        #[derive(Debug)]
+        struct Resource(Arc<AtomicBool>);
+        impl Drop for Resource {
+            fn drop(&mut self) {
+                self.0.store(true, Ordering::Release);
+            }
+        }
+
+        let dir = TempDir::new().unwrap();
+        let released = Arc::new(AtomicBool::new(false));
+        let session = LocalWorkdirSession::materialized_bound_with_environment(
+            Workdir::new("resource-session"),
+            dir.path().to_path_buf(),
+            dir.path().to_path_buf(),
+            SharedScope::new(Scope::writable(dir.path()).unwrap()),
+            WorkdirSessionCapabilities::ALL,
+            BTreeMap::from([("SSH_AUTH_SOCK".to_string(), "test-socket".to_string())]),
+            vec![Arc::new(Resource(released.clone()))],
+        );
+        WorkdirSession::close(&session).await.unwrap();
+        assert!(released.load(Ordering::Acquire));
+    }
+
    #[tokio::test]
    async fn provider_cancels_active_command() {
        let dir = TempDir::new().unwrap();
@@ -30,6 +30,8 @@ impl RuntimeWorkerRef {
 #[serde(rename_all = "snake_case")]
 pub enum MaterializerKind {
    #[default]
+    RuntimeGitCache,
+    /// Legacy persisted value from the pre-cache local `git worktree` materializer.
    LocalGitWorktree,
 }

@@ -109,6 +111,8 @@ pub struct WorkingDirectoryProvenance {
    pub creation_selector: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub creation_ref: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub creation_tree: Option<String>,
    pub materializer_kind: MaterializerKind,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub cleanup_target: Option<WorkingDirectoryCleanupTarget>,
@@ -122,6 +126,10 @@ pub struct WorkingDirectoryCurrentObservation {
    pub current_selector: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub current_ref: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub current_tree: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub observed_at_epoch_seconds: Option<u64>,
    pub status: WorkingDirectoryStatusKind,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub cleanliness: Option<String>,
@@ -141,9 +149,15 @@ pub struct WorkingDirectorySummary {
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub creation_ref: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub creation_tree: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub current_selector: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub current_ref: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub current_tree: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub observed_at_epoch_seconds: Option<u64>,
    pub materializer_kind: MaterializerKind,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub cleanup_target: Option<WorkingDirectoryCleanupTarget>,
@@ -166,6 +180,7 @@ impl WorkingDirectorySummary {
        WorkingDirectoryProvenance {
            creation_selector: self.creation_selector.clone(),
            creation_ref: self.creation_ref.clone(),
+            creation_tree: self.creation_tree.clone(),
            materializer_kind: self.materializer_kind.clone(),
            cleanup_target: self.cleanup_target.clone(),
        }
@@ -175,6 +190,8 @@ impl WorkingDirectorySummary {
        WorkingDirectoryCurrentObservation {
            current_selector: self.current_selector.clone(),
            current_ref: self.current_ref.clone(),
+            current_tree: self.current_tree.clone(),
+            observed_at_epoch_seconds: self.observed_at_epoch_seconds,
            status: self.status.clone(),
            cleanliness: self.cleanliness.clone(),
            primary_worker_id: self.primary_worker_id.clone(),
@@ -247,8 +264,11 @@ mod tests {
                    repository_id: "repo".to_string(),
                    creation_selector: Some("develop".to_string()),
                    creation_ref: Some("abc123".to_string()),
+                    creation_tree: Some("tree123".to_string()),
                    current_selector: Some("work/ticket".to_string()),
                    current_ref: Some("def456".to_string()),
+                    current_tree: Some("tree456".to_string()),
+                    observed_at_epoch_seconds: Some(1_777_777_777),
                    materializer_kind: MaterializerKind::LocalGitWorktree,
                    cleanup_target: Some(WorkingDirectoryCleanupTarget {
                        kind: "git_worktree".to_string(),
@@ -269,8 +289,11 @@ mod tests {
                    repository_id: "repo".to_string(),
                    creation_selector: None,
                    creation_ref: None,
+                    creation_tree: None,
                    current_selector: None,
                    current_ref: Some("987fed".to_string()),
+                    current_tree: None,
+                    observed_at_epoch_seconds: None,
                    materializer_kind: MaterializerKind::LocalGitWorktree,
                    cleanup_target: None,
                    status: WorkingDirectoryStatusKind::Active,
@@ -43,6 +43,7 @@ tokio = { workspace = true, features = ["net", "rt", "sync", "time"] }
 toml.workspace = true
 url.workspace = true
 uuid = { workspace = true, features = ["v7"] }
+zeroize.workspace = true
 tower = { workspace = true, features = ["util"], optional = true }
 worker.workspace = true
 workspace-api = { path = "../workspace-api" }
@@ -97,6 +97,74 @@ pub use workdir::workspace::{
    WorkingDirectorySummary,
 };

+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SensitiveString(String);
+
+impl SensitiveString {
+    pub fn new(value: impl Into<String>) -> Self {
+        Self(value.into())
+    }
+
+    pub fn expose(&self) -> &str {
+        &self.0
+    }
+}
+
+impl Drop for SensitiveString {
+    fn drop(&mut self) {
+        zeroize::Zeroize::zeroize(&mut self.0);
+    }
+}
+
+impl Default for SensitiveString {
+    fn default() -> Self {
+        Self(String::new())
+    }
+}
+
+impl std::fmt::Debug for SensitiveString {
+    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        formatter.write_str("[REDACTED]")
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RepositorySshMaterializationAccess {
+    pub credential_id: String,
+    pub credential_revision: u64,
+    pub host_trust_id: String,
+    pub host_trust_revision: u64,
+    pub access: workspace_api::RepositoryAccessMode,
+    pub expires_at_epoch_seconds: u64,
+    pub repository_id: String,
+    pub repository_source_fingerprint: String,
+    pub repository_uri: String,
+    pub secret_resource: crate::resource::BackendResourceHandle,
+    #[serde(skip, default)]
+    pub private_key: SensitiveString,
+    #[serde(skip, default)]
+    pub known_hosts_entry: SensitiveString,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RepositoryMaterializationContext {
+    pub workspace_id: String,
+    pub runtime_id: String,
+    pub operation_id: String,
+    pub config_revision: u64,
+    pub config_projection_digest: String,
+    #[serde(default)]
+    pub cache_generation: u64,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub ssh: Option<RepositorySshMaterializationAccess>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct WorkingDirectoryRepositoryAccessRequest {
+    pub working_directory_id: String,
+    pub materialization: RepositoryMaterializationContext,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct WorkingDirectoryRequest {
    pub repository: WorkingDirectoryRepository,
@@ -106,6 +174,9 @@ pub struct WorkingDirectoryRequest {
    /// Backend can create canonical registry rows before materialization.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub backend_workdir_id: Option<String>,
+    /// Backend-authored, operation-scoped repository access and cache identity.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub materialization: Option<RepositoryMaterializationContext>,
 }

 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -1,4 +1,6 @@
-use crate::catalog::{WorkingDirectoryRequest, WorkingDirectoryStatus};
+use crate::catalog::{
+    WorkingDirectoryRepositoryAccessRequest, WorkingDirectoryRequest, WorkingDirectoryStatus,
+};
 use crate::config_bundle::ConfigBundle;
 use crate::error::RuntimeError;
 use crate::identity::WorkerRef;
@@ -319,6 +321,16 @@ pub trait WorkerExecutionBackend: Send + Sync + 'static {
        ))
    }

+    fn authorize_working_directory_repository_access(
+        &self,
+        _request: &WorkingDirectoryRepositoryAccessRequest,
+    ) -> Result<(), WorkingDirectoryDiagnostic> {
+        Err(WorkingDirectoryDiagnostic::rejected(
+            "working_directory_repository_access_unsupported",
+            "Worker execution backend does not support Repository access authorization",
+        ))
+    }
+
    fn list_working_directories(&self) -> Vec<WorkingDirectoryStatus> {
        Vec::new()
    }
@@ -454,6 +466,14 @@ impl WorkerExecutionBackendRef {
        self.backend.create_working_directory(request)
    }

+    pub(crate) fn authorize_working_directory_repository_access(
+        &self,
+        request: &WorkingDirectoryRepositoryAccessRequest,
+    ) -> Result<(), WorkingDirectoryDiagnostic> {
+        self.backend
+            .authorize_working_directory_repository_access(request)
+    }
+
    pub(crate) fn list_working_directories(&self) -> Vec<WorkingDirectoryStatus> {
        self.backend.list_working_directories()
    }
@@ -12,7 +12,8 @@ use crate::auth::{
 };
 use crate::catalog::{
    ConfigBundleRef, CreateWorkerRequest, WorkerDetail, WorkerLifecycleAck, WorkerSummary,
-    WorkingDirectoryRequest, WorkingDirectoryStatus, WorkspaceApiRef,
+    WorkingDirectoryRepositoryAccessRequest, WorkingDirectoryRequest, WorkingDirectoryStatus,
+    WorkspaceApiRef,
 };
 use crate::config_bundle::{ConfigBundle, ConfigBundleAvailability, ConfigBundleSummary};
 use crate::error::RuntimeError;
@@ -203,6 +204,10 @@ fn runtime_http_router_with_optional_auth(
            "/v1/working-directories",
            get(list_working_directories).post(create_working_directory),
        )
+        .route(
+            "/v1/working-directories/repository-access",
+            post(authorize_working_directory_repository_access),
+        )
        .route(
            "/v1/working-directories/{working_directory_id}/sessions",
            post(open_workdir_session),
@@ -335,6 +340,11 @@ pub struct RuntimeHttpWorkingDirectoriesResponse {
    pub working_directories: Vec<WorkingDirectoryStatus>,
 }

+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct RuntimeHttpRepositoryAccessResponse {
+    pub authorized: bool,
+}
+
 /// Working directory response used by create/detail/delete endpoints.
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct RuntimeHttpWorkingDirectoryResponse {
@@ -513,6 +523,29 @@ async fn list_workers(
    Ok(Json(RuntimeHttpWorkersResponse { workers }))
 }

+async fn authorize_working_directory_repository_access(
+    State(state): State<RuntimeHttpState>,
+    Extension(auth): Extension<RuntimeAuthContext>,
+    body: Result<Json<WorkingDirectoryRepositoryAccessRequest>, JsonRejection>,
+) -> RestResult<RuntimeHttpRepositoryAccessResponse> {
+    let Json(request) = body.map_err(RuntimeHttpRestError::json_rejection)?;
+    if request.materialization.workspace_id != auth.workspace_id {
+        return Err(RuntimeHttpRestError::new(
+            StatusCode::FORBIDDEN,
+            "working_directory_materialization_workspace_mismatch",
+            "Repository access authority does not match the authenticated Workspace",
+        ));
+    }
+    state
+        .runtime
+        .authorize_working_directory_repository_access_from_resource(request)
+        .await
+        .map_err(RuntimeHttpRestError::runtime)?;
+    Ok(Json(RuntimeHttpRepositoryAccessResponse {
+        authorized: true,
+    }))
+}
+
 async fn list_working_directories(
    State(state): State<RuntimeHttpState>,
 ) -> RestResult<RuntimeHttpWorkingDirectoriesResponse> {
@@ -527,12 +560,23 @@ async fn list_working_directories(

 async fn create_working_directory(
    State(state): State<RuntimeHttpState>,
+    Extension(auth): Extension<RuntimeAuthContext>,
    body: Result<Json<WorkingDirectoryRequest>, JsonRejection>,
 ) -> RestResult<RuntimeHttpWorkingDirectoryResponse> {
    let Json(request) = body.map_err(RuntimeHttpRestError::json_rejection)?;
+    if let Some(materialization) = request.materialization.as_ref()
+        && materialization.workspace_id != auth.workspace_id
+    {
+        return Err(RuntimeHttpRestError::new(
+            StatusCode::FORBIDDEN,
+            "working_directory_materialization_workspace_mismatch",
+            "Repository materialization authority does not match the authenticated Workspace",
+        ));
+    }
    let working_directory = state
        .runtime
-        .create_working_directory(request)
+        .create_working_directory_from_resource(request)
+        .await
        .map_err(RuntimeHttpRestError::runtime)?;
    Ok(Json(RuntimeHttpWorkingDirectoryResponse {
        working_directory,
@@ -1559,6 +1603,9 @@ fn required_runtime_permission(method: &Method, path: &str) -> Option<&'static s
    if path == "/v1/workers" && *method == Method::POST {
        return Some("workers:create");
    }
+    if path == "/v1/working-directories/repository-access" && *method == Method::POST {
+        return Some("workdirs:operate");
+    }
    if path.starts_with("/v1/workdir-sessions")
        || (path.starts_with("/v1/working-directories/") && path.ends_with("/sessions"))
    {
@@ -2220,6 +2267,10 @@ mod tests {

    #[test]
    fn workdir_routes_require_dedicated_operation_permission() {
+        assert_eq!(
+            required_runtime_permission(&Method::POST, "/v1/working-directories/repository-access",),
+            Some("workdirs:operate")
+        );
        assert_eq!(
            required_runtime_permission(&Method::POST, "/v1/working-directories/wd-1/sessions"),
            Some("workdirs:operate")
@@ -23,10 +23,21 @@ use worker_runtime::http_server::{
    RuntimeHttpServerConfig, RuntimeHttpServerError, RuntimeHttpStoreSelection,
 };
 use worker_runtime::worker_backend::{ProfileRuntimeWorkerFactory, WorkerRuntimeExecutionBackend};
-use worker_runtime::working_directory::LocalGitWorktreeMaterializer;
+use worker_runtime::working_directory::RuntimeGitCacheMaterializer;
 use worker_runtime::{Runtime, RuntimeOptions};

 fn main() -> ExitCode {
+    let mut arguments = std::env::args().skip(1).collect::<Vec<_>>();
+    if arguments.first().map(String::as_str) == Some("__repository-ssh") {
+        arguments.remove(0);
+        return match worker_runtime::working_directory::run_repository_ssh_client(&arguments) {
+            Ok(status) => ExitCode::from(u8::try_from(status).unwrap_or(1)),
+            Err(error) => {
+                eprintln!("{error}");
+                ExitCode::from(1)
+            }
+        };
+    }
    match run() {
        Ok(()) => ExitCode::SUCCESS,
        Err(error) => {
@@ -169,6 +180,9 @@ fn build_runtime(config: &ProcessConfig) -> Result<Runtime, ProcessError> {
            factory = factory.with_remote_worker_mutation_identity(identity);
        }
    }
+    let mut backend_resource_client: Option<
+        Arc<dyn worker_runtime::resource::BackendResourceClient>,
+    > = None;
    if let Some(endpoint) = config.backend_resource_endpoint.clone() {
        let identity = runtime_auth.identity.as_ref().ok_or_else(|| {
            ProcessError::Auth(
@@ -181,26 +195,28 @@ fn build_runtime(config: &ProcessConfig) -> Result<Runtime, ProcessError> {
                    .to_owned(),
            ));
        };
-        factory = factory.with_resource_client(Arc::new(
+        let client = Arc::new(
            worker_runtime::resource::HttpBackendResourceClient::new(
                endpoint,
                config.backend_resource_token.clone(),
            )
            .with_runtime_request_source(identity, trusted_server.server_id.clone()),
-        ));
+        );
+        factory = factory.with_resource_client(client.clone());
+        backend_resource_client = Some(client);
    }
    let backend = Arc::new(
        WorkerRuntimeExecutionBackend::new(factory)
            .map_err(ProcessError::WorkerAdapter)?
-            .with_working_directory_materializer(LocalGitWorktreeMaterializer::new(
+            .with_working_directory_materializer(RuntimeGitCacheMaterializer::new(
                fs_paths.workdir_target.clone(),
            )),
    );

-    match &config.http.store {
+    let runtime = match &config.http.store {
        RuntimeHttpStoreSelection::Memory => {
            Runtime::with_execution_backend(runtime_options_from_http(&config.http), backend)
-                .map_err(ProcessError::Runtime)
+                .map_err(ProcessError::Runtime)?
        }
        RuntimeHttpStoreSelection::Fs { root } => {
            let mut options = FsRuntimeStoreOptions::new(root.clone()).with_runtime_id(
@@ -213,12 +229,20 @@ fn build_runtime(config: &ProcessConfig) -> Result<Runtime, ProcessError> {
            );
            options.display_name = config.http.display_name.clone();
            Runtime::with_fs_store_and_execution_backend(options, backend)
-                .map_err(ProcessError::Runtime)
+                .map_err(ProcessError::Runtime)?
        }
-        _ => Err(ProcessError::usage(
-            "unsupported Runtime catalog store selection".to_string(),
-        )),
+        _ => {
+            return Err(ProcessError::usage(
+                "unsupported Runtime catalog store selection".to_string(),
+            ));
+        }
+    };
+    if let Some(client) = backend_resource_client {
+        runtime
+            .install_backend_resource_client(client)
+            .map_err(ProcessError::Runtime)?;
    }
+    Ok(runtime)
 }

 fn runtime_options_from_http(config: &RuntimeHttpServerConfig) -> RuntimeOptions {
@@ -11,18 +11,46 @@ use std::sync::Mutex;

 pub const PROFILE_SOURCE_ARCHIVE_CONTENT_TYPE: &str =
    "application/vnd.yoi.profile-source-archive+tar";
+pub const REPOSITORY_SSH_ACCESS_CONTENT_TYPE: &str =
+    "application/vnd.yoi.repository-ssh-access+json";
 pub const DEFAULT_PROFILE_SOURCE_ARCHIVE_MAX_BYTES: u64 = 2 * 1024 * 1024;
+pub const DEFAULT_REPOSITORY_SSH_ACCESS_MAX_BYTES: u64 = 64 * 1024;
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct RepositorySshAccessSecret {
+    pub private_key: String,
+    pub known_hosts_entry: String,
+}
+
+impl Drop for RepositorySshAccessSecret {
+    fn drop(&mut self) {
+        zeroize::Zeroize::zeroize(&mut self.private_key);
+        zeroize::Zeroize::zeroize(&mut self.known_hosts_entry);
+    }
+}
+
+impl std::fmt::Debug for RepositorySshAccessSecret {
+    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        formatter
+            .debug_struct("RepositorySshAccessSecret")
+            .field("private_key", &"[REDACTED]")
+            .field("known_hosts_entry", &"[REDACTED]")
+            .finish()
+    }
+}

 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum BackendResourceKind {
    ProfileSourceArchive,
+    RepositorySshAccess,
 }

 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum BackendResourceOperation {
    FetchArchive,
+    FetchOnce,
 }

 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -66,7 +94,7 @@ pub struct BackendResourceFetchRequest {
    pub audit_correlation_id: String,
 }

-#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct BackendResourceFetchResponse {
    pub kind: BackendResourceKind,
    pub resource_id: String,
@@ -76,6 +104,29 @@ pub struct BackendResourceFetchResponse {
    pub audit_correlation_id: String,
 }

+impl std::fmt::Debug for BackendResourceFetchResponse {
+    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        formatter
+            .debug_struct("BackendResourceFetchResponse")
+            .field("kind", &self.kind)
+            .field("resource_id", &self.resource_id)
+            .field("digest", &self.digest)
+            .field("content_type", &self.content_type)
+            .field(
+                "bytes",
+                &format_args!("[REDACTED; {} bytes]", self.bytes.len()),
+            )
+            .field("audit_correlation_id", &self.audit_correlation_id)
+            .finish()
+    }
+}
+
+impl Drop for BackendResourceFetchResponse {
+    fn drop(&mut self) {
+        self.bytes.fill(0);
+    }
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, thiserror::Error)]
 #[serde(tag = "code", rename_all = "snake_case")]
 pub enum BackendResourceError {
@@ -248,7 +299,7 @@ pub fn build_profile_source_archive_fetch_request(

 pub fn profile_source_archive_from_response(
    handle: &BackendResourceHandle,
-    response: BackendResourceFetchResponse,
+    mut response: BackendResourceFetchResponse,
 ) -> Result<ProfileSourceArchive, BackendResourceError> {
    if handle.kind != BackendResourceKind::ProfileSourceArchive
        || response.kind != BackendResourceKind::ProfileSourceArchive
@@ -263,7 +314,7 @@ pub fn profile_source_archive_from_response(
    if response.content_type != handle.content_type {
        return Err(BackendResourceError::ContentTypeMismatch {
            expected: handle.content_type.clone(),
-            actual: response.content_type,
+            actual: response.content_type.clone(),
        });
    }
    let actual_bytes = response.bytes.len() as u64;
@@ -278,7 +329,7 @@ pub fn profile_source_archive_from_response(
        return Err(BackendResourceError::DigestMismatch {
            expected: handle.digest.clone(),
            actual: if response.digest != handle.digest {
-                response.digest
+                response.digest.clone()
            } else {
                actual_digest
            },
@@ -296,7 +347,7 @@ pub fn profile_source_archive_from_response(
                }
            })?,
        },
-        content: response.bytes,
+        content: std::mem::take(&mut response.bytes),
    })
 }

@@ -1,6 +1,6 @@
 use crate::catalog::{
    ConfigBundleRef, CreateWorkerRequest, ProfileSelector, WorkerDetail, WorkerLifecycleAck,
-    WorkerStatus, WorkerSummary, WorkingDirectoryRequest,
+    WorkerStatus, WorkerSummary, WorkingDirectoryRepositoryAccessRequest, WorkingDirectoryRequest,
    WorkingDirectoryStatus as CatalogWorkingDirectoryStatus, WorkspaceApiRef,
 };
 use crate::config_bundle::{
@@ -26,6 +26,10 @@ use crate::management::{
 };
 #[cfg(feature = "ws-server")]
 use crate::observation::{WorkerObservationCursor, WorkerObservationEvent};
+use crate::resource::{
+    BackendResourceClient, BackendResourceError, BackendResourceFetchRequest, BackendResourceKind,
+    REPOSITORY_SSH_ACCESS_CONTENT_TYPE, RepositorySshAccessSecret,
+};
 #[cfg(feature = "fs-store")]
 use crate::retention::{
    FsWorkerRetentionProvider, WorkerRetentionExecutionRequest, WorkerRetentionExecutionResult,
@@ -172,6 +176,14 @@ impl Runtime {
        Ok(runtime)
    }

+    pub fn install_backend_resource_client(
+        &self,
+        client: Arc<dyn BackendResourceClient>,
+    ) -> Result<(), RuntimeError> {
+        self.lock()?.backend_resource_client = Some(BackendResourceClientRef(client));
+        Ok(())
+    }
+
    /// Create or restore a filesystem-backed Runtime.
    ///
    /// The store is scoped by `options.root`; if the directory already exists,
@@ -366,6 +378,103 @@ impl Runtime {
            .map_err(RuntimeError::from)
    }

+    pub async fn create_working_directory_from_resource(
+        &self,
+        mut request: WorkingDirectoryRequest,
+    ) -> Result<CatalogWorkingDirectoryStatus, RuntimeError> {
+        if let Some(ssh) = request
+            .materialization
+            .as_mut()
+            .and_then(|materialization| materialization.ssh.as_mut())
+        {
+            self.resolve_repository_access_resource(ssh).await?;
+        }
+        self.create_working_directory(request)
+    }
+
+    pub fn authorize_working_directory_repository_access(
+        &self,
+        request: WorkingDirectoryRepositoryAccessRequest,
+    ) -> Result<(), RuntimeError> {
+        let backend = {
+            let state = self.lock()?;
+            state.ensure_running()?;
+            state.execution_backend.clone().ok_or_else(|| {
+                RuntimeError::ExecutionBackendUnavailable {
+                    message: "working directory Repository access requires an execution backend"
+                        .to_string(),
+                }
+            })?
+        };
+        backend
+            .authorize_working_directory_repository_access(&request)
+            .map_err(RuntimeError::from)
+    }
+
+    async fn resolve_repository_access_resource(
+        &self,
+        ssh: &mut crate::catalog::RepositorySshMaterializationAccess,
+    ) -> Result<(), RuntimeError> {
+        if !ssh.private_key.expose().is_empty() && !ssh.known_hosts_entry.expose().is_empty() {
+            return Ok(());
+        }
+        let (client, runtime_id) = {
+            let state = self.lock()?;
+            let client = state.backend_resource_client.clone().ok_or_else(|| {
+                RuntimeError::InvalidRequest(
+                    "Backend Repository access resource client is unavailable".to_string(),
+                )
+            })?;
+            let runtime_id = state.runtime_identity.clone().ok_or_else(|| {
+                RuntimeError::InvalidRequest("Runtime identity is unavailable".to_string())
+            })?;
+            (client, runtime_id)
+        };
+        let mut response = client
+            .0
+            .fetch_resource(BackendResourceFetchRequest {
+                handle: ssh.secret_resource.clone(),
+                runtime_id,
+                worker_id: None,
+                audit_correlation_id: ssh.secret_resource.audit_correlation_id.clone(),
+            })
+            .await
+            .map_err(repository_resource_error)?;
+        if response.kind != BackendResourceKind::RepositorySshAccess
+            || response.content_type != REPOSITORY_SSH_ACCESS_CONTENT_TYPE
+            || response.resource_id != ssh.secret_resource.resource_id
+            || response.digest != ssh.secret_resource.digest
+            || response.bytes.len() as u64 > ssh.secret_resource.max_bytes
+        {
+            return Err(RuntimeError::InvalidRequest(
+                "Backend Repository SSH access resource response was invalid".to_string(),
+            ));
+        }
+        let secret = serde_json::from_slice::<RepositorySshAccessSecret>(&response.bytes);
+        response.bytes.fill(0);
+        let mut secret = secret.map_err(|_| {
+            RuntimeError::InvalidRequest(
+                "Backend Repository SSH access resource payload was invalid".to_string(),
+            )
+        })?;
+        ssh.private_key =
+            crate::catalog::SensitiveString::new(std::mem::take(&mut secret.private_key));
+        ssh.known_hosts_entry =
+            crate::catalog::SensitiveString::new(std::mem::take(&mut secret.known_hosts_entry));
+        Ok(())
+    }
+
+    pub async fn authorize_working_directory_repository_access_from_resource(
+        &self,
+        mut request: WorkingDirectoryRepositoryAccessRequest,
+    ) -> Result<(), RuntimeError> {
+        let ssh = request.materialization.ssh.as_mut().ok_or_else(|| {
+            RuntimeError::InvalidRequest("Repository SSH access metadata is missing".to_string())
+        })?;
+        self.resolve_repository_access_resource(ssh).await?;
+        self.authorize_working_directory_repository_access(request)
+    }
+
    /// List Runtime-owned working directories through the attached execution backend.
    pub fn list_working_directories(
        &self,
@@ -566,12 +675,13 @@ impl Runtime {
            let worker_id = request.worker_id;
            let worker_ref = WorkerRef::new(worker_id);

+            let durable_request = durable_create_worker_request(&request);
            let record = WorkerRecord {
                worker_ref: worker_ref.clone(),
                worker_id: worker_id.clone(),
                status: WorkerStatus::Stopped,
                workspace_id: scope.map(|scope| scope.workspace_id.clone()),
-                request: request.clone(),
+                request: durable_request,
                run_generation: 1,
                working_directory: None,
                execution_handle: None,
@@ -1842,6 +1952,15 @@ struct SubscriptionSink {
    lagged: Arc<AtomicBool>,
 }

+#[derive(Clone)]
+struct BackendResourceClientRef(Arc<dyn BackendResourceClient>);
+
+impl std::fmt::Debug for BackendResourceClientRef {
+    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        formatter.write_str("BackendResourceClientRef(..)")
+    }
+}
+
 #[derive(Debug)]
 struct RuntimeState {
    display_name: Option<String>,
@@ -1853,6 +1972,7 @@ struct RuntimeState {
    persistence: RuntimePersistence,
    status: RuntimeStatus,
    execution_backend: Option<WorkerExecutionBackendRef>,
+    backend_resource_client: Option<BackendResourceClientRef>,
    #[cfg(feature = "fs-store")]
    next_diagnostic_id: u64,
    workers: BTreeMap<WorkerId, WorkerRecord>,
@@ -1880,6 +2000,7 @@ impl RuntimeState {
            persistence: RuntimePersistence::Memory,
            status: RuntimeStatus::Running,
            execution_backend: None,
+            backend_resource_client: None,
            #[cfg(feature = "fs-store")]
            next_diagnostic_id: 1,
            workers: BTreeMap::new(),
@@ -1908,6 +2029,7 @@ impl RuntimeState {
            persistence: RuntimePersistence::Fs(store),
            status: RuntimeStatus::Running,
            execution_backend: None,
+            backend_resource_client: None,
            #[cfg(feature = "fs-store")]
            next_diagnostic_id: 1,
            workers: BTreeMap::new(),
@@ -1959,6 +2081,7 @@ impl RuntimeState {
            persistence: RuntimePersistence::Fs(store),
            status: persisted.status,
            execution_backend: None,
+            backend_resource_client: None,
            next_diagnostic_id,
            workers,
            config_bundles: BTreeMap::new(),
@@ -2619,6 +2742,7 @@ impl RuntimeState {
                protocol::WorkerStatus::Running => Some(WorkerStatus::Running),
                protocol::WorkerStatus::Idle => Some(WorkerStatus::Idle),
                protocol::WorkerStatus::Paused => Some(WorkerStatus::Paused),
+                protocol::WorkerStatus::Stopped => Some(WorkerStatus::Stopped),
            },
            protocol::Event::RunEnd { result } => match result {
                protocol::RunResult::Finished | protocol::RunResult::RolledBack => {
@@ -2714,6 +2838,33 @@ fn worker_status_from_run_state(run_state: WorkerExecutionRunState) -> WorkerSta
    }
 }

+fn repository_resource_error(error: BackendResourceError) -> RuntimeError {
+    let category = match error {
+        BackendResourceError::Expired => "expired",
+        BackendResourceError::Unauthorized { .. } => "unauthorized",
+        BackendResourceError::UnsupportedKind => "unsupported_kind",
+        BackendResourceError::MissingResource => "missing_resource",
+        BackendResourceError::Oversized { .. } => "oversized",
+        BackendResourceError::DigestMismatch { .. } => "digest_mismatch",
+        BackendResourceError::ContentTypeMismatch { .. } => "content_type_mismatch",
+        BackendResourceError::InvalidResponse { .. } => "invalid_response",
+        BackendResourceError::Transport { .. } => "transport",
+    };
+    RuntimeError::InvalidRequest(format!(
+        "Backend Repository SSH access resource fetch failed: {category}"
+    ))
+}
+
+fn durable_create_worker_request(request: &CreateWorkerRequest) -> CreateWorkerRequest {
+    let mut durable = request.clone();
+    if let Some(working_directory) = durable.working_directory_request.as_mut()
+        && let Some(materialization) = working_directory.materialization.as_mut()
+    {
+        materialization.ssh = None;
+    }
+    durable
+}
+
 fn requested_primary_workdir_id(request: &CreateWorkerRequest) -> Option<&str> {
    request
        .working_directory
@@ -2884,7 +3035,9 @@ fn subscription_worker_state(status: WorkerStatus) -> SubscriptionWorkerState {
 mod tests {
    use super::*;
    use crate::catalog::{
-        ConfigBundleRef, ProfileSelector, WorkingDirectoryClaim, WorkspaceApiRef,
+        ConfigBundleRef, MaterializerKind, ProfileSelector, RepositoryMaterializationContext,
+        RepositorySshMaterializationAccess, SensitiveString, WorkingDirectoryClaim,
+        WorkingDirectoryRepository, WorkingDirectoryRequest, WorkspaceApiRef,
    };
    use crate::config_bundle::{
        ConfigBundle, ConfigBundleMetadata, ConfigBundleProvenance, ConfigDeclaration,
@@ -2894,6 +3047,8 @@ mod tests {
        WorkerExecutionBackend, WorkerExecutionContext, WorkerExecutionHandle,
        WorkerExecutionRestoreRequest, WorkerExecutionRunState,
    };
+    use crate::working_directory::WorkingDirectoryDiagnostic;
+    use async_trait::async_trait;
    use std::collections::BTreeMap;
    #[cfg(feature = "fs-store")]
    use std::sync::atomic::{AtomicU64, Ordering};
@@ -2950,7 +3105,7 @@ mod tests {
            &mut activity,
            &internal_worker_status_event(
                internal_worker_ref("child-b", None),
-                protocol::WorkerStatus::Idle,
+                protocol::WorkerStatus::Stopped,
            ),
        ));
    }
@@ -3115,6 +3270,243 @@ mod tests {
        }
    }

+    #[test]
+    fn durable_worker_request_omits_repository_credentials() {
+        let mut request = task_request("worker-secret-redaction");
+        request.working_directory_request = Some(WorkingDirectoryRequest {
+            repository: WorkingDirectoryRepository {
+                id: "repository-1".to_string(),
+                provider: "git".to_string(),
+                source: workspace_api::RepositorySource {
+                    kind: workspace_api::RepositorySourceKind::Ssh,
+                    uri: "ssh://git@example.test/repo.git".to_string(),
+                },
+                source_revision: 1,
+                source_fingerprint: "sha256:source".to_string(),
+                selector: None,
+            },
+            materializer: MaterializerKind::RuntimeGitCache,
+            backend_workdir_id: Some("working-directory-1".to_string()),
+            materialization: Some(RepositoryMaterializationContext {
+                workspace_id: "workspace-1".to_string(),
+                runtime_id: "runtime-1".to_string(),
+                operation_id: "operation-1".to_string(),
+                config_revision: 1,
+                config_projection_digest: "sha256:projection".to_string(),
+                cache_generation: 0,
+                ssh: Some(RepositorySshMaterializationAccess {
+                    credential_id: "credential-1".to_string(),
+                    credential_revision: 1,
+                    host_trust_id: "host-trust-1".to_string(),
+                    host_trust_revision: 1,
+                    access: workspace_api::RepositoryAccessMode::ReadOnly,
+                    expires_at_epoch_seconds: u64::MAX,
+                    repository_id: "repository-1".to_string(),
+                    repository_source_fingerprint: "sha256:source".to_string(),
+                    repository_uri: "ssh://git@example.test/repo.git".to_string(),
+                    secret_resource: repository_resource_handle(),
+                    private_key: SensitiveString::new("private-key-bytes"),
+                    known_hosts_entry: SensitiveString::new("known-hosts-entry"),
+                }),
+            }),
+        });
+
+        let durable = durable_create_worker_request(&request);
+
+        assert!(
+            request
+                .working_directory_request
+                .as_ref()
+                .and_then(|working_directory| working_directory.materialization.as_ref())
+                .and_then(|materialization| materialization.ssh.as_ref())
+                .is_some()
+        );
+        assert!(
+            durable
+                .working_directory_request
+                .as_ref()
+                .and_then(|working_directory| working_directory.materialization.as_ref())
+                .and_then(|materialization| materialization.ssh.as_ref())
+                .is_none()
+        );
+        let serialized = serde_json::to_string(&durable).unwrap();
+        assert!(!serialized.contains("private-key-bytes"));
+        assert!(!serialized.contains("known-hosts-entry"));
+    }
+
+    fn repository_resource_handle() -> crate::resource::BackendResourceHandle {
+        crate::resource::BackendResourceHandle {
+            kind: crate::resource::BackendResourceKind::RepositorySshAccess,
+            workspace_id: "workspace-1".to_string(),
+            scope_id: Some("repository-ssh-access".to_string()),
+            runtime_id: Some("runtime-1".to_string()),
+            worker_id: None,
+            resource_id: "repository-access-1".to_string(),
+            digest: "opaque:repository-access-1".to_string(),
+            operation: crate::resource::BackendResourceOperation::FetchOnce,
+            expires_at_unix_seconds: i64::MAX,
+            nonce: "repository-access-1".to_string(),
+            revision: "1".to_string(),
+            generation: None,
+            max_bytes: crate::resource::DEFAULT_REPOSITORY_SSH_ACCESS_MAX_BYTES,
+            content_type: crate::resource::REPOSITORY_SSH_ACCESS_CONTENT_TYPE.to_string(),
+            redaction: crate::resource::ResourceRedactionPolicy::RuntimeInternalOnly,
+            audit_correlation_id: "repository-access-1".to_string(),
+            profile_source_graph: None,
+        }
+    }
+
+    #[tokio::test]
+    async fn repository_access_resource_is_fetched_before_provider_authorization() {
+        let (runtime, backend) = runtime_and_backend();
+        backend
+            .repository_access_available
+            .store(true, Ordering::SeqCst);
+        runtime.bind_runtime_identity("runtime-1").unwrap();
+        let handle = repository_resource_handle();
+        runtime
+            .install_backend_resource_client(Arc::new(TestRepositoryResourceClient {
+                response: Mutex::new(Some(crate::resource::BackendResourceFetchResponse {
+                    kind: crate::resource::BackendResourceKind::RepositorySshAccess,
+                    resource_id: handle.resource_id.clone(),
+                    digest: handle.digest.clone(),
+                    content_type: crate::resource::REPOSITORY_SSH_ACCESS_CONTENT_TYPE.to_string(),
+                    bytes: serde_json::to_vec(&RepositorySshAccessSecret {
+                        private_key: "private-key-bytes".to_string(),
+                        known_hosts_entry: "known-hosts-entry".to_string(),
+                    })
+                    .unwrap(),
+                    audit_correlation_id: handle.audit_correlation_id.clone(),
+                })),
+            }))
+            .unwrap();
+        let request = WorkingDirectoryRepositoryAccessRequest {
+            working_directory_id: "working-directory-1".to_string(),
+            materialization: RepositoryMaterializationContext {
+                workspace_id: "workspace-1".to_string(),
+                runtime_id: "runtime-1".to_string(),
+                operation_id: "operation-1".to_string(),
+                config_revision: 1,
+                config_projection_digest: "sha256:projection".to_string(),
+                cache_generation: 0,
+                ssh: Some(RepositorySshMaterializationAccess {
+                    credential_id: "credential-1".to_string(),
+                    credential_revision: 1,
+                    host_trust_id: "host-trust-1".to_string(),
+                    host_trust_revision: 1,
+                    access: workspace_api::RepositoryAccessMode::ReadOnly,
+                    expires_at_epoch_seconds: u64::MAX,
+                    repository_id: "repository-1".to_string(),
+                    repository_source_fingerprint: "sha256:source".to_string(),
+                    repository_uri: "ssh://git@example.test/repo.git".to_string(),
+                    secret_resource: handle,
+                    private_key: SensitiveString::default(),
+                    known_hosts_entry: SensitiveString::default(),
+                }),
+            },
+        };
+
+        let replay = request.clone();
+        runtime
+            .authorize_working_directory_repository_access_from_resource(request)
+            .await
+            .unwrap();
+        assert!(
+            runtime
+                .authorize_working_directory_repository_access_from_resource(replay)
+                .await
+                .is_err()
+        );
+
+        let accesses = backend.repository_accesses.lock().unwrap();
+        assert_eq!(accesses.len(), 1);
+        let access = accesses[0].materialization.ssh.as_ref().unwrap();
+        assert_eq!(access.private_key.expose(), "private-key-bytes");
+        assert_eq!(access.known_hosts_entry.expose(), "known-hosts-entry");
+    }
+
+    #[tokio::test]
+    async fn working_directory_create_fetches_repository_access_before_provider_call() {
+        let (runtime, backend) = runtime_and_backend();
+        backend
+            .repository_access_available
+            .store(true, Ordering::SeqCst);
+        runtime.bind_runtime_identity("runtime-1").unwrap();
+        let handle = repository_resource_handle();
+        runtime
+            .install_backend_resource_client(Arc::new(TestRepositoryResourceClient {
+                response: Mutex::new(Some(crate::resource::BackendResourceFetchResponse {
+                    kind: crate::resource::BackendResourceKind::RepositorySshAccess,
+                    resource_id: handle.resource_id.clone(),
+                    digest: handle.digest.clone(),
+                    content_type: crate::resource::REPOSITORY_SSH_ACCESS_CONTENT_TYPE.to_string(),
+                    bytes: serde_json::to_vec(&RepositorySshAccessSecret {
+                        private_key: "create-private-key-bytes".to_string(),
+                        known_hosts_entry: "create-known-hosts-entry".to_string(),
+                    })
+                    .unwrap(),
+                    audit_correlation_id: handle.audit_correlation_id.clone(),
+                })),
+            }))
+            .unwrap();
+        let request = WorkingDirectoryRequest {
+            repository: WorkingDirectoryRepository {
+                id: "repository-1".to_string(),
+                provider: "git".to_string(),
+                source: workspace_api::RepositorySource {
+                    kind: workspace_api::RepositorySourceKind::Ssh,
+                    uri: "ssh://git@example.test/repo.git".to_string(),
+                },
+                source_revision: 1,
+                source_fingerprint: "sha256:source".to_string(),
+                selector: None,
+            },
+            materializer: MaterializerKind::RuntimeGitCache,
+            backend_workdir_id: Some("working-directory-1".to_string()),
+            materialization: Some(RepositoryMaterializationContext {
+                workspace_id: "workspace-1".to_string(),
+                runtime_id: "runtime-1".to_string(),
+                operation_id: "operation-create".to_string(),
+                config_revision: 1,
+                config_projection_digest: "sha256:projection".to_string(),
+                cache_generation: 0,
+                ssh: Some(RepositorySshMaterializationAccess {
+                    credential_id: "credential-1".to_string(),
+                    credential_revision: 1,
+                    host_trust_id: "host-trust-1".to_string(),
+                    host_trust_revision: 1,
+                    access: workspace_api::RepositoryAccessMode::ReadOnly,
+                    expires_at_epoch_seconds: u64::MAX,
+                    repository_id: "repository-1".to_string(),
+                    repository_source_fingerprint: "sha256:source".to_string(),
+                    repository_uri: "ssh://git@example.test/repo.git".to_string(),
+                    secret_resource: handle,
+                    private_key: SensitiveString::default(),
+                    known_hosts_entry: SensitiveString::default(),
+                }),
+            }),
+        };
+
+        assert!(
+            runtime
+                .create_working_directory_from_resource(request)
+                .await
+                .is_err()
+        );
+
+        let requests = backend.working_directory_requests.lock().unwrap();
+        let access = requests[0]
+            .materialization
+            .as_ref()
+            .and_then(|materialization| materialization.ssh.as_ref())
+            .unwrap();
+        assert_eq!(access.private_key.expose(), "create-private-key-bytes");
+        assert_eq!(
+            access.known_hosts_entry.expose(),
+            "create-known-hosts-entry"
+        );
+    }
+
    fn scoped_task_request(objective: &str, workspace_id: &str) -> CreateWorkerRequest {
        let mut request = task_request(objective);
        request.workspace_api = Some(WorkspaceApiRef {
@@ -3196,6 +3588,9 @@ mod tests {
        config_bundles: Mutex<Vec<Option<ConfigBundle>>>,
        contexts: Mutex<BTreeMap<WorkerId, WorkerExecutionContext>>,
        dispatched_inputs: Mutex<Vec<WorkerInput>>,
+        repository_accesses: Mutex<Vec<WorkingDirectoryRepositoryAccessRequest>>,
+        repository_access_available: AtomicBool,
+        working_directory_requests: Mutex<Vec<WorkingDirectoryRequest>>,
        preserve_commit_ack_submission_id: AtomicBool,
        #[cfg(feature = "ws-server")]
        snapshots: Mutex<BTreeMap<WorkerId, protocol::Event>>,
@@ -3236,6 +3631,38 @@ mod tests {
            "test-execution-backend"
        }

+        fn create_working_directory(
+            &self,
+            request: &WorkingDirectoryRequest,
+        ) -> Result<CatalogWorkingDirectoryStatus, WorkingDirectoryDiagnostic> {
+            self.working_directory_requests
+                .lock()
+                .unwrap()
+                .push(request.clone());
+            Err(WorkingDirectoryDiagnostic::rejected(
+                "working_directory_unsupported",
+                "Worker execution backend does not support working directory materialization",
+            ))
+        }
+
+        fn authorize_working_directory_repository_access(
+            &self,
+            request: &WorkingDirectoryRepositoryAccessRequest,
+        ) -> Result<(), WorkingDirectoryDiagnostic> {
+            self.repository_accesses
+                .lock()
+                .unwrap()
+                .push(request.clone());
+            if self.repository_access_available.load(Ordering::SeqCst) {
+                Ok(())
+            } else {
+                Err(WorkingDirectoryDiagnostic::rejected(
+                    "working_directory_repository_access_unsupported",
+                    "Worker execution backend does not support Repository access authorization",
+                ))
+            }
+        }
+
        fn spawn_worker(&self, request: WorkerExecutionSpawnRequest) -> WorkerExecutionSpawnResult {
            self.run_generations
                .lock()
@@ -3343,6 +3770,24 @@ mod tests {
        }
    }

+    struct TestRepositoryResourceClient {
+        response: Mutex<Option<crate::resource::BackendResourceFetchResponse>>,
+    }
+
+    #[async_trait]
+    impl BackendResourceClient for TestRepositoryResourceClient {
+        async fn fetch_resource(
+            &self,
+            _request: BackendResourceFetchRequest,
+        ) -> Result<crate::resource::BackendResourceFetchResponse, BackendResourceError> {
+            self.response
+                .lock()
+                .unwrap()
+                .take()
+                .ok_or(BackendResourceError::MissingResource)
+        }
+    }
+
    fn runtime_with_backend() -> Runtime {
        let runtime = Runtime::with_execution_backend(
            RuntimeOptions::default(),
@@ -20,7 +20,7 @@ use crate::auth::{
 };
 use crate::catalog::{
    CreateWorkerRequest, ProfileSourceArchiveHttpRef, ProfileSourceArchiveSource,
-    WorkingDirectoryRequest, WorkingDirectoryStatus,
+    WorkingDirectoryRepositoryAccessRequest, WorkingDirectoryRequest, WorkingDirectoryStatus,
 };
 use crate::execution::{
    WorkerExecutionBackend, WorkerExecutionHandle, WorkerExecutionOperation,
@@ -38,9 +38,7 @@ use crate::working_directory::{
 };
 use async_trait::async_trait;
 use protocol::{Event, Method, Segment, WorkerStatus};
-use session_store::{
-    CombinedStore, LogEntry, WorkerAggregateStore, WorkerSessionStore, collect_state,
-};
+use session_store::{CombinedStore, LogEntry, WorkerAggregateStore, WorkerSessionStore};
 #[cfg(test)]
 use session_store::{FsStore, FsWorkerStore};
 use tokio::runtime::Runtime;
@@ -68,8 +66,10 @@ const RUNTIME_TASK_TIMEOUT: Duration = Duration::from_secs(10);
 const USER_INPUT_COMMIT_TIMEOUT: Duration = Duration::from_secs(9);

 fn user_input_has_submission(entry: &LogEntry, submission_id: &str) -> bool {
-    let LogEntry::UserInput { extensions, .. } = entry else {
-        return false;
+    let extensions = match entry {
+        LogEntry::UserInput { extensions, .. }
+        | LogEntry::AnnotatedUserInput { extensions, .. } => extensions,
+        _ => return false,
    };
    extensions.iter().any(|extension| {
        extension.domain == WORKER_INPUT_SUBMISSION_EXTENSION_DOMAIN
@@ -212,11 +212,11 @@ impl WorkerObservationProvider for RuntimeGrantedWorkerObservationProvider {
            return Err(WorkerObservationError::NotFound);
        }
        let entries = sink.subscribe_with_snapshot().0;
-        let state = collect_state(&entries);
-        Ok(WorkerSessionCapture {
-            segment_id: format!("runtime:{runtime_id}:worker:{worker_id}"),
-            items: state.history,
-        })
+        WorkerSessionCapture::from_log_entries(
+            format!("runtime:{runtime_id}:worker:{worker_id}"),
+            &entries,
+        )
+        .map_err(WorkerObservationError::Unavailable)
    }
 }

@@ -706,13 +706,17 @@ fn runtime_local_workdir_session(
    root: &Path,
    cwd: &Path,
    scope: manifest::SharedScope,
+    command_environment: std::collections::BTreeMap<String, String>,
+    resources: Vec<Arc<dyn workdir::WorkdirSessionResource>>,
 ) -> WorkdirSessionHandle {
-    Arc::new(LocalWorkdirSession::materialized_bound(
+    Arc::new(LocalWorkdirSession::materialized_bound_with_environment(
        Workdir::new(workdir_id),
        root.to_path_buf(),
        cwd.to_path_buf(),
        scope,
        WorkdirSessionCapabilities::ALL,
+        command_environment,
+        resources,
    ))
 }

@@ -893,6 +897,8 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
                binding.root(),
                binding.cwd(),
                worker.scope().clone(),
+                binding.command_environment(),
+                binding.session_resources(),
            )));
        } else {
            worker.bind_workdir_session(None);
@@ -1071,6 +1077,8 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
                binding.root(),
                binding.cwd(),
                worker.scope().clone(),
+                binding.command_environment(),
+                binding.session_resources(),
            )));
        } else {
            worker.bind_workdir_session(None);
@@ -1538,7 +1546,9 @@ fn accepted_notify_run_state(status: WorkerStatus, auto_run: bool) -> WorkerExec
    match status {
        WorkerStatus::Running => WorkerExecutionRunState::Busy,
        WorkerStatus::Idle if auto_run => WorkerExecutionRunState::Busy,
-        WorkerStatus::Idle | WorkerStatus::Paused => WorkerExecutionRunState::Idle,
+        WorkerStatus::Idle | WorkerStatus::Paused | WorkerStatus::Stopped => {
+            WorkerExecutionRunState::Idle
+        }
    }
 }

@@ -1582,6 +1592,19 @@ where
        Ok(materializer.create(request)?.status())
    }

+    fn authorize_working_directory_repository_access(
+        &self,
+        request: &WorkingDirectoryRepositoryAccessRequest,
+    ) -> Result<(), WorkingDirectoryDiagnostic> {
+        let materializer = self.working_directory_materializer.as_ref().ok_or_else(|| {
+            WorkingDirectoryDiagnostic::rejected(
+                "working_directory_materializer_unavailable",
+                "working directory Repository access requested, but no materializer is configured for this runtime backend",
+            )
+        })?;
+        materializer.authorize_repository_access(request)
+    }
+
    fn list_working_directories(&self) -> Vec<WorkingDirectoryStatus> {
        self.working_directory_materializer
            .as_ref()
@@ -1624,6 +1647,8 @@ where
            binding.root(),
            binding.cwd(),
            manifest::SharedScope::new(scope),
+            binding.command_environment(),
+            binding.session_resources(),
        ))
    }

@@ -2142,7 +2167,7 @@ mod tests {
    use crate::identity::WorkerRef;
    use crate::management::RuntimeOptions;
    use crate::observation::WorkerObservationCursor;
-    use crate::working_directory::LocalGitWorktreeMaterializer;
+    use crate::working_directory::RuntimeGitCacheMaterializer;
    use agen::Engine;
    use agen::llm_client::event::{Event as LlmEvent, ResponseStatus, StatusEvent};
    use agen::llm_client::{ClientError, LlmClient, Request};
@@ -2482,7 +2507,9 @@ mod tests {
            let scope = Scope::writable(&scope_root).map_err(|err| err.to_string())?;
            let worker = Worker::new(
                manifest,
-                Engine::new(self.client.clone()),
+                Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(
+                    self.client.clone(),
+                ),
                store,
                workspace_context,
                filesystem_authority,
@@ -2728,8 +2755,9 @@ mod tests {
                source_fingerprint: "sha256:test".to_string(),
                selector: Some(RepositorySelector::from("HEAD")),
            },
-            materializer: MaterializerKind::LocalGitWorktree,
+            materializer: MaterializerKind::RuntimeGitCache,
            backend_workdir_id: None,
+            materialization: None,
        }
    }

@@ -2853,12 +2881,16 @@ mod tests {
            root.path(),
            root.path(),
            manifest::SharedScope::new(Scope::writable(root.path()).unwrap()),
+            Default::default(),
+            Vec::new(),
        );
        let restored = runtime_local_workdir_session(
            "working-directory-42",
            root.path(),
            root.path(),
            manifest::SharedScope::new(Scope::writable(root.path()).unwrap()),
+            Default::default(),
+            Vec::new(),
        );

        assert_eq!(spawned.workdir().id().as_str(), "working-directory-42");
@@ -3213,14 +3245,17 @@ mod tests {
            matches!(
                entry,
                LogEntry::UserInput { segments, .. }
+                | LogEntry::AnnotatedUserInput { segments, .. }
                    if segments == &vec![Segment::text("start the ticket")]
            )
        }));
        let submission_id = entries
            .iter()
            .find_map(|entry| {
-                let LogEntry::UserInput { extensions, .. } = entry else {
-                    return None;
+                let extensions = match entry {
+                    LogEntry::UserInput { extensions, .. }
+                    | LogEntry::AnnotatedUserInput { extensions, .. } => extensions,
+                    _ => return None,
                };
                extensions
                    .iter()
@@ -3330,7 +3365,7 @@ mod tests {
        };
        let backend = WorkerRuntimeExecutionBackend::new(factory)
            .unwrap()
-            .with_working_directory_materializer(LocalGitWorktreeMaterializer::new(
+            .with_working_directory_materializer(RuntimeGitCacheMaterializer::new(
                runtime_base.path(),
            ));
        let runtime =
@@ -3485,7 +3520,7 @@ mod tests {
        };
        let backend = WorkerRuntimeExecutionBackend::new(factory)
            .unwrap()
-            .with_working_directory_materializer(LocalGitWorktreeMaterializer::new(
+            .with_working_directory_materializer(RuntimeGitCacheMaterializer::new(
                runtime_base.path(),
            ));
        let runtime =
@@ -3524,7 +3559,7 @@ mod tests {
        let repo = create_clean_repo();
        let backend = WorkerRuntimeExecutionBackend::new(FailingFactory)
            .unwrap()
-            .with_working_directory_materializer(LocalGitWorktreeMaterializer::new(
+            .with_working_directory_materializer(RuntimeGitCacheMaterializer::new(
                runtime_base.path(),
            ));
        let runtime =
@@ -3560,7 +3595,7 @@ mod tests {
        let repo = create_clean_repo();
        let backend = WorkerRuntimeExecutionBackend::new(FailingFactory)
            .unwrap()
-            .with_working_directory_materializer(LocalGitWorktreeMaterializer::new(
+            .with_working_directory_materializer(RuntimeGitCacheMaterializer::new(
                runtime_base.path(),
            ));
        let runtime =
@@ -3574,9 +3609,15 @@ mod tests {

        assert!(format!("{error:?}").contains("spawn failed"));
        let working_directories_root = runtime_base.path();
-        let remaining_entries = fs::read_dir(working_directories_root)
-            .map(|entries| entries.count())
+        let remaining_workdirs = fs::read_dir(working_directories_root)
+            .map(|entries| {
+                entries
+                    .flatten()
+                    .filter(|entry| !entry.file_name().to_string_lossy().starts_with('.'))
+                    .count()
+            })
            .unwrap_or(0);
-        assert_eq!(remaining_entries, 0);
+        assert_eq!(remaining_workdirs, 0);
+        assert!(working_directories_root.join(".repository-cache").is_dir());
    }
 }
@@ -66,11 +66,12 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
        WorkerRunResult::Finished => println!("(finished)"),
        WorkerRunResult::Paused => println!("(paused)"),
        WorkerRunResult::LimitReached => println!("(turn limit reached)"),
+        WorkerRunResult::Interrupted { message, .. } => println!("(interrupted: {message})"),
        WorkerRunResult::RolledBack => println!("(empty turn rolled back)"),
    }

    // 5. Extract the assistant's reply from history
-    let history = worker.engine().history();
+    let history = worker.history();
    if let Some(text) = history
        .iter()
        .rev()
@@ -22,7 +22,7 @@ use crate::compact::token_counter::{
    EstimateSource, savings_for_prune_impl, token_estimates_for_prune_impl,
 };

-impl<C: LlmClient, St: Store> Worker<C, St> {
+impl<C: LlmClient + 'static, St: Store> Worker<C, St> {
    /// Enable prune projection on the underlying Engine.
    ///
    /// Registers the config and token/savings-estimator closures on the Engine.
@@ -242,13 +242,13 @@ pub(crate) fn savings_for_prune_impl(

 // ── Worker に生やす公開 API ───────────────────────────────────────────────

-impl<C: LlmClient, St: Store> Worker<C, St> {
+impl<C: LlmClient + 'static, St: Store> Worker<C, St> {
    /// 現在の history 全体の推定トークン数。
    ///
    /// 最後の measurement と、その後に追加された未測定分の byte/4 外挿。
    pub fn total_tokens(&self) -> TokenEstimate {
        let usage = self.usage_history();
-        agen::token_counter::total_tokens(self.history(), &usage)
+        agen::token_counter::total_tokens(&self.history(), &usage)
    }

    /// 任意の history index 時点でのプロンプト全長推定。
@@ -259,7 +259,7 @@ impl<C: LlmClient, St: Store> Worker<C, St> {
    /// pointer 以降に増えたプロンプト長を測るのに使う。
    pub fn total_tokens_at(&self, history_len: usize) -> TokenEstimate {
        let usage = self.usage_history();
-        agen::token_counter::total_tokens_at(self.history(), &usage, history_len)
+        agen::token_counter::total_tokens_at(&self.history(), &usage, history_len)
    }

    /// 末尾から `retained` トークン以上を残すための分割位置。
@@ -267,7 +267,7 @@ impl<C: LlmClient, St: Store> Worker<C, St> {
    /// `history[..cut.index]` が要約／破棄される側、`history[cut.index..]` が残る側。
    pub fn split_for_retained(&self, retained: u64) -> SplitPoint {
        let usage = self.usage_history();
-        split_for_retained_impl(self.history(), &usage, retained)
+        split_for_retained_impl(&self.history(), &usage, retained)
    }
 }

@@ -31,12 +31,11 @@ use workdir::LocalWorkdirSession;
 use workdir::{ReadRequest, WorkdirPath, WorkdirSessionHandle};

 use crate::compact::usage_tracker::UsageTracker;
-use crate::fs_view::ReadRequirement;
-#[cfg(test)]
-use crate::fs_view::slice_lines;
-use crate::session_capture::{
-    ReadDetail, ReadOptions, ReadSelector, SearchOptions, SessionCapture, ToolPart,
+use crate::feature::{
+    FeatureDescriptor, FeatureInstallContext, FeatureInstallError, FeatureModule, ToolContribution,
+    ToolDeclaration,
 };
+use crate::fs_view::ReadRequirement;

 /// Aggregated output of a compact worker run.
 #[derive(Debug, Default, Clone)]
@@ -91,248 +90,19 @@ struct SummaryParams {
    pub text: String,
 }

-/// Input to `search_session_log`.
-#[derive(Debug, Deserialize, schemars::JsonSchema)]
-struct SearchSessionParams {
-    /// Case-insensitive substring to search in compact-target history.
-    pub query: String,
-    /// 0-based item offset to start searching from.
-    #[serde(default)]
-    pub offset: Option<usize>,
-    /// Maximum number of hits to return.
-    #[serde(default)]
-    pub limit: Option<usize>,
-}
-
-/// Input to `read_session_items`.
-#[derive(Debug, Deserialize, schemars::JsonSchema)]
-struct ReadSessionParams {
-    /// 0-based compact-target history item offset.
-    pub offset: usize,
-    /// Maximum number of items to return.
-    pub limit: usize,
-    /// `compact` omits tool arguments/full results; `full` includes message text and tool result content.
-    #[serde(default = "default_session_read_mode")]
-    pub mode: String,
-}
-
-fn default_session_read_mode() -> String {
-    "compact".to_string()
-}
-
-const SESSION_TOOL_MAX_OUTPUT_TOKENS: u64 = 12_000;
-const SESSION_SEARCH_MAX_RESULTS: usize = 50;
-const SESSION_READ_MAX_ITEMS: usize = 80;
-
 const MARK_DESCRIPTION: &str = "Inject a file's contents into the compacted context so the \
 next session starts with it already read. Use this for files the next task needs in full. \
 Optionally specify `offset` (0-based line) and `limit` (line count) to inject only a slice. \
-Counts against `auto_read_budget`; overflow returns an error and the mark is not recorded. \
-Paths must be absolute.";
+Counts against `auto_read_budget`; overflow returns an error and the mark is not recorded.";

-const REFERENCE_DESCRIPTION: &str = "Record a file path as a named reference in the compacted \
-context without injecting its contents. Use for files that are contextually relevant but \
-whose current content the next session can fetch on demand.";
+const REFERENCE_DESCRIPTION: &str = "Record a Workdir-relative file path as a named reference in \
+the compacted context without injecting its contents. Use for files that are contextually \
+relevant but whose current content the next session can fetch on demand.";

 const SUMMARY_DESCRIPTION: &str = "Provide the final structured summary text. Subsequent calls \
 replace the previous content; only the last call is used. Must be called before the compact run \
 ends or compaction fails.";

-const SEARCH_SESSION_DESCRIPTION: &str = "Search the compact-target session history by \
-case-insensitive substring. Returns item indexes and compact snippets. Use this when the initial \
-overview is not enough to identify which part of the session matters. Results are bounded; narrow \
-the query if important details are omitted.";
-
-const READ_SESSION_DESCRIPTION: &str = "Read a bounded range of compact-target session history \
-items by 0-based index. mode='compact' omits tool arguments, full tool results, and reasoning \
-bodies; mode='full' includes message text and tool result content but still remains bounded. Use \
-this to verify details before writing the summary.";
-
-struct SessionLogToolState {
-    items: Arc<Vec<Item>>,
-    view: SessionCapture,
-}
-
-struct SearchSessionLogTool {
-    state: Arc<SessionLogToolState>,
-}
-
-#[async_trait]
-impl Tool for SearchSessionLogTool {
-    async fn execute(
-        &self,
-        input_json: &str,
-        _ctx: agen::tool::ToolExecutionContext,
-    ) -> Result<ToolOutput, ToolError> {
-        let params: SearchSessionParams = serde_json::from_str(input_json).map_err(|e| {
-            ToolError::InvalidArgument(format!("invalid search_session_log input: {e}"))
-        })?;
-        let query = params.query.trim().to_lowercase();
-        if query.is_empty() {
-            return Err(ToolError::InvalidArgument(
-                "search_session_log query must not be empty".to_string(),
-            ));
-        }
-        let offset = params.offset.unwrap_or(0);
-        let limit = params
-            .limit
-            .unwrap_or(20)
-            .clamp(1, SESSION_SEARCH_MAX_RESULTS);
-        let hits = self.state.view.search(&SearchOptions {
-            query: params.query.clone(),
-            kind: None,
-            tool_part: None,
-            tool_name: None,
-            limit: Some(limit),
-            min_entry_index: Some(offset as u64),
-            from: None,
-            through: None,
-            offset: 0,
-        });
-        let blocks = hits
-            .iter()
-            .map(|hit| {
-                let part = hit
-                    .tool_part
-                    .map(|part| format!(" {part:?}"))
-                    .unwrap_or_default();
-                let tool = hit
-                    .tool_name
-                    .as_ref()
-                    .map(|name| format!(" {name}"))
-                    .unwrap_or_default();
-                format!(
-                    "[{} {}{}{} {:?}] {}\n{}",
-                    hit.id,
-                    hit.kind.as_str(),
-                    part,
-                    tool,
-                    hit.entry_range,
-                    hit.label,
-                    hit.summary
-                )
-            })
-            .collect::<Vec<_>>();
-        let mut content = blocks.join("\n\n");
-        let truncated = truncate_to_token_budget(&mut content, SESSION_TOOL_MAX_OUTPUT_TOKENS);
-        let summary = if hits.is_empty() {
-            format!("No session log hits for {query:?} from item offset {offset}.")
-        } else if truncated {
-            format!(
-                "Found {} session log hit(s) for {query:?}; output truncated. Narrow the query.",
-                hits.len()
-            )
-        } else {
-            format!("Found {} session log hit(s) for {query:?}.", hits.len())
-        };
-        Ok(ToolOutput {
-            summary,
-            content: (!content.is_empty()).then_some(content),
-
-            attachments: Vec::new(),
-        })
-    }
-}
-
-struct ReadSessionItemsTool {
-    state: Arc<SessionLogToolState>,
-}
-
-#[async_trait]
-impl Tool for ReadSessionItemsTool {
-    async fn execute(
-        &self,
-        input_json: &str,
-        _ctx: agen::tool::ToolExecutionContext,
-    ) -> Result<ToolOutput, ToolError> {
-        let params: ReadSessionParams = serde_json::from_str(input_json).map_err(|e| {
-            ToolError::InvalidArgument(format!("invalid read_session_items input: {e}"))
-        })?;
-        let mode = SessionReadMode::parse(&params.mode)?;
-        let offset = params.offset.min(self.state.items.len());
-        let limit = params.limit.clamp(1, SESSION_READ_MAX_ITEMS);
-        let end = offset.saturating_add(limit).min(self.state.items.len());
-        let detail = match mode {
-            SessionReadMode::Compact => ReadDetail::Compact,
-            SessionReadMode::Full => ReadDetail::Full,
-        };
-        let read = if offset >= end {
-            crate::session_capture::ReadResult {
-                entries: Vec::new(),
-                truncated: false,
-            }
-        } else {
-            self.state.view.read(
-                ReadSelector::EntryRange([offset as u64, end.saturating_sub(1) as u64]),
-                ReadOptions {
-                    include_tools: true,
-                    tool_part: ToolPart::Both,
-                    detail,
-                    max_items: limit,
-                    max_bytes: 48 * 1024,
-                },
-            )
-        };
-        let mut content = read
-            .entries
-            .iter()
-            .map(|entry| entry.text.clone())
-            .collect::<Vec<_>>()
-            .join("\n\n");
-        let token_truncated =
-            truncate_to_token_budget(&mut content, SESSION_TOOL_MAX_OUTPUT_TOKENS);
-        let truncated = read.truncated || token_truncated;
-        let summary = if truncated {
-            format!(
-                "Read session items {offset}..{end} in {mode:?} mode; output truncated. Narrow the range."
-            )
-        } else {
-            format!("Read session items {offset}..{end} in {mode:?} mode.")
-        };
-        Ok(ToolOutput {
-            summary,
-            content: (!content.is_empty()).then_some(content),
-
-            attachments: Vec::new(),
-        })
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-enum SessionReadMode {
-    Compact,
-    Full,
-}
-
-impl SessionReadMode {
-    fn parse(value: &str) -> Result<Self, ToolError> {
-        match value {
-            "compact" => Ok(Self::Compact),
-            "full" => Ok(Self::Full),
-            other => Err(ToolError::InvalidArgument(format!(
-                "invalid read_session_items mode {other:?}; expected 'compact' or 'full'"
-            ))),
-        }
-    }
-}
-
-fn truncate_to_token_budget(text: &mut String, max_tokens: u64) -> bool {
-    let max_bytes = max_tokens.saturating_mul(4) as usize;
-    if text.len() <= max_bytes {
-        return false;
-    }
-    let mut cut = 0;
-    for (idx, _) in text.char_indices() {
-        if idx > max_bytes {
-            break;
-        }
-        cut = idx;
-    }
-    text.truncate(cut);
-    text.push_str("\n… [session tool output truncated]");
-    true
-}
-
 struct MarkReadRequiredTool {
    session: WorkdirSessionHandle,
    ctx: Arc<Mutex<CompactWorkerContext>>,
@@ -508,36 +278,63 @@ pub(crate) fn write_summary_tool(ctx: Arc<Mutex<CompactWorkerContext>>) -> ToolD
    })
 }

-pub(crate) fn search_session_log_tool(items: Arc<Vec<Item>>) -> ToolDefinition {
-    let view = SessionCapture::new("compact-target", (*items).clone());
-    let state = Arc::new(SessionLogToolState { items, view });
-    Arc::new(move || {
-        let schema = schemars::schema_for!(SearchSessionParams);
-        let schema_value = serde_json::to_value(schema).unwrap_or(serde_json::json!({}));
-        let meta = ToolMeta::new("search_session_log")
-            .description(SEARCH_SESSION_DESCRIPTION)
-            .input_schema(schema_value);
-        let tool: Arc<dyn Tool> = Arc::new(SearchSessionLogTool {
-            state: state.clone(),
-        });
-        (meta, tool)
-    })
+#[derive(Clone)]
+pub(crate) struct CompactionOutputFeature {
+    session: Option<WorkdirSessionHandle>,
+    tracker: tools::Tracker,
+    context: Arc<Mutex<CompactWorkerContext>>,
 }

-pub(crate) fn read_session_items_tool(items: Arc<Vec<Item>>) -> ToolDefinition {
-    let view = SessionCapture::new("compact-target", (*items).clone());
-    let state = Arc::new(SessionLogToolState { items, view });
-    Arc::new(move || {
-        let schema = schemars::schema_for!(ReadSessionParams);
-        let schema_value = serde_json::to_value(schema).unwrap_or(serde_json::json!({}));
-        let meta = ToolMeta::new("read_session_items")
-            .description(READ_SESSION_DESCRIPTION)
-            .input_schema(schema_value);
-        let tool: Arc<dyn Tool> = Arc::new(ReadSessionItemsTool {
-            state: state.clone(),
-        });
-        (meta, tool)
-    })
+impl CompactionOutputFeature {
+    pub(crate) fn new(
+        session: Option<WorkdirSessionHandle>,
+        tracker: tools::Tracker,
+        context: Arc<Mutex<CompactWorkerContext>>,
+    ) -> Self {
+        Self {
+            session,
+            tracker,
+            context,
+        }
+    }
+}
+
+impl FeatureModule for CompactionOutputFeature {
+    fn descriptor(&self) -> FeatureDescriptor {
+        let descriptor = FeatureDescriptor::builtin("compaction-output", "Compaction Output")
+            .with_description("Read-only Workdir access and bounded compaction output decisions.")
+            .with_tool(ToolDeclaration::new("add_reference", REFERENCE_DESCRIPTION))
+            .with_tool(ToolDeclaration::new("write_summary", SUMMARY_DESCRIPTION));
+        if self.session.is_some() {
+            descriptor
+                .with_tool(ToolDeclaration::new("Read", "Read a Workdir file."))
+                .with_tool(ToolDeclaration::new("mark_read_required", MARK_DESCRIPTION))
+        } else {
+            descriptor
+        }
+    }
+
+    fn install(&self, context: &mut FeatureInstallContext<'_>) -> Result<(), FeatureInstallError> {
+        if let Some(session) = &self.session {
+            context.tools().register(ToolContribution::new(
+                "Read",
+                tools::read_tool(session.clone(), self.tracker.clone()),
+            ))?;
+            context.tools().register(ToolContribution::new(
+                "mark_read_required",
+                mark_read_required_tool(session.clone(), self.context.clone()),
+            ))?;
+        }
+        context.tools().register(ToolContribution::new(
+            "add_reference",
+            add_reference_tool(self.context.clone()),
+        ))?;
+        context.tools().register(ToolContribution::new(
+            "write_summary",
+            write_summary_tool(self.context.clone()),
+        ))?;
+        Ok(())
+    }
 }

 /// Interceptor that monitors compact-worker context occupancy.
@@ -810,53 +607,4 @@ mod tests {
        assert_eq!(guard.references.len(), 1);
        assert_eq!(guard.references[0], PathBuf::from(p));
    }
-
-    #[tokio::test]
-    async fn search_session_log_returns_bounded_hits_without_full_tool_content() {
-        let items = Arc::new(vec![
-            Item::user_message("investigate compact failure"),
-            Item::tool_result_with_content(
-                "call-1",
-                "read trace with compact failure",
-                "very large raw trace body with secret detail",
-            ),
-        ]);
-        let view = SessionCapture::new("test", (*items).clone());
-        let tool: Arc<dyn Tool> = Arc::new(SearchSessionLogTool {
-            state: Arc::new(SessionLogToolState { items, view }),
-        });
-        let input = serde_json::json!({ "query": "compact", "limit": 10 }).to_string();
-        let out = tool.execute(&input, Default::default()).await.unwrap();
-        let content = out.content.unwrap();
-
-        assert!(content.contains("investigate compact failure"));
-        assert!(content.contains("read trace with compact failure"));
-        assert!(!content.contains("secret detail"));
-    }
-
-    #[tokio::test]
-    async fn read_session_items_full_mode_can_read_tool_result_content() {
-        let items = Arc::new(vec![Item::tool_result_with_content(
-            "call-1",
-            "read trace",
-            "raw trace detail",
-        )]);
-        let view = SessionCapture::new("test", (*items).clone());
-        let tool: Arc<dyn Tool> = Arc::new(ReadSessionItemsTool {
-            state: Arc::new(SessionLogToolState { items, view }),
-        });
-        let input = serde_json::json!({ "offset": 0, "limit": 1, "mode": "full" }).to_string();
-        let out = tool.execute(&input, Default::default()).await.unwrap();
-        let content = out.content.unwrap();
-
-        assert!(content.contains("raw trace detail"));
-    }
-
-    #[test]
-    fn slice_lines_handles_offset_and_limit() {
-        let text = "a\nb\nc\nd";
-        assert_eq!(slice_lines(text, 0, None), "a\nb\nc\nd");
-        assert_eq!(slice_lines(text, 1, Some(2)), "b\nc");
-        assert_eq!(slice_lines(text, 10, None), "");
-    }
 }
@@ -383,6 +383,7 @@ impl WorkerController {
        worker.attach_alerter(alerter.clone());
        // Also hand the raw broadcast sender so Worker-internal operations
        // can emit typed lifecycle `Event`s (currently: compact progress).
+        worker.attach_internal_worker_registry(spawned_registry.clone());
        worker.attach_event_tx(event_tx.clone());

        // Bash spills long outputs to a per-worker subdir under the runtime
@@ -421,7 +422,6 @@ impl WorkerController {
        wire_event_bridges_on_engine(&mut worker, &event_tx, &alerter, &in_flight);

        // === 3. Tool registration (builtin / memory / spawn-orchestration) ===
-        spawned_registry.attach_parent_protocol(event_tx.clone(), worker.session_id().to_string());
        let fs_for_view = register_worker_tools(
            &mut worker,
            bash_output_dir,
@@ -485,6 +485,7 @@ impl WorkerController {
        // into the controller task so the in-flight turn can be reached
        // via these handles while worker itself is borrowed by drive_turn.
        let cancel_tx = worker.engine_mut().cancel_sender();
+        let pause_tx = worker.engine_mut().pause_sender();
        let notify_buffer = worker.notify_buffer_handle();

        tokio::spawn(controller_loop(
@@ -494,6 +495,7 @@ impl WorkerController {
            shared_state,
            runtime_dir,
            cancel_tx,
+            pause_tx,
            notify_buffer,
            self_parent_socket,
            spawner_name,
@@ -763,6 +765,19 @@ pub(crate) fn wire_event_bridges_on_engine<C, St>(
            id: result.tool_use_id.clone(),
            summary: result.summary.clone(),
            output: result.content.clone(),
+            disposition: Some(match result.disposition {
+                agen::ToolResultDisposition::Success => protocol::ToolResultDisposition::Success,
+                agen::ToolResultDisposition::Error => protocol::ToolResultDisposition::Error,
+                agen::ToolResultDisposition::Interrupted => {
+                    protocol::ToolResultDisposition::Interrupted
+                }
+                agen::ToolResultDisposition::Cancelled => {
+                    protocol::ToolResultDisposition::Cancelled
+                }
+                agen::ToolResultDisposition::OutcomeUnknown => {
+                    protocol::ToolResultDisposition::OutcomeUnknown
+                }
+            }),
            is_error: result.is_error,
        });
    });
@@ -873,6 +888,14 @@ where
    }

    let mut feature_registry = FeatureRegistryBuilder::new();
+    if feature_config.sub_worker.enabled {
+        feature_registry.add_module(
+            crate::feature::builtin::manage_worker::sub_worker_control_feature(
+                worker.workspace_client_handle(),
+                spawned_registry.clone(),
+            ),
+        );
+    }
    if feature_config.task.enabled {
        feature_registry.add_module(task_feature);
    }
@@ -975,14 +998,6 @@ where

    if feature_config.sub_worker.enabled {
        worker.register_worker_orchestration_instruction();
-        if !feature_config.worker.enabled {
-            feature_registry.add_module(
-                crate::feature::builtin::manage_worker::sub_worker_control_feature(
-                    worker.workspace_client_handle(),
-                    spawned_registry.clone(),
-                ),
-            );
-        }
    }

    let host_worker_observation_provider = worker.worker_observation_provider();
@@ -1115,6 +1130,7 @@ async fn controller_loop<C, St>(
    shared_state: Arc<WorkerSharedState>,
    runtime_dir: Arc<RuntimeDir>,
    cancel_tx: mpsc::Sender<()>,
+    pause_tx: mpsc::Sender<()>,
    notify_buffer: NotifyBuffer,
    self_parent_socket: Option<PathBuf>,
    spawner_name: String,
@@ -1161,22 +1177,35 @@ async fn controller_loop<C, St>(
            // clear at run start prevents stale partial output left by an older
            // interrupted/error turn from being carried into the next snapshot.
            worker.clear_in_flight_events();
-            set_controller_status(
-                &shared_state,
-                &runtime_dir,
-                &event_tx,
-                WorkerStatus::Running,
-            )
-            .await;
            let parent_originated = run.is_parent_originated();
+            let user_input_run = matches!(&run, PendingRun::Run(_) | PendingRun::RunTracked { .. });
+            if !user_input_run {
+                set_controller_status(
+                    &shared_state,
+                    &runtime_dir,
+                    &event_tx,
+                    WorkerStatus::Running,
+                )
+                .await;
+            }
            let (mut new_status, shutdown) = match run {
                PendingRun::Run(input) => {
+                    let (input_commit_tx, input_commit_rx) = oneshot::channel();
                    drive_turn(
-                        worker.run(input),
+                        worker.run_with_input_extensions_and_commit_hook(
+                            input,
+                            Vec::new(),
+                            move || {
+                                let _ = input_commit_tx.send(());
+                            },
+                        ),
                        &mut method_rx,
                        &event_tx,
                        &cancel_tx,
+                        &pause_tx,
                        &shared_state,
+                        &runtime_dir,
+                        Some(input_commit_rx),
                        &notify_buffer,
                        self_parent_socket.as_ref(),
                        &spawner_name,
@@ -1186,12 +1215,22 @@ async fn controller_loop<C, St>(
                    .await
                }
                PendingRun::RunTracked { input, extension } => {
+                    let (input_commit_tx, input_commit_rx) = oneshot::channel();
                    drive_turn(
-                        worker.run_with_input_extensions(input, vec![extension]),
+                        worker.run_with_input_extensions_and_commit_hook(
+                            input,
+                            vec![extension],
+                            move || {
+                                let _ = input_commit_tx.send(());
+                            },
+                        ),
                        &mut method_rx,
                        &event_tx,
                        &cancel_tx,
+                        &pause_tx,
                        &shared_state,
+                        &runtime_dir,
+                        Some(input_commit_rx),
                        &notify_buffer,
                        self_parent_socket.as_ref(),
                        &spawner_name,
@@ -1206,7 +1245,10 @@ async fn controller_loop<C, St>(
                        &mut method_rx,
                        &event_tx,
                        &cancel_tx,
+                        &pause_tx,
                        &shared_state,
+                        &runtime_dir,
+                        None,
                        &notify_buffer,
                        self_parent_socket.as_ref(),
                        &spawner_name,
@@ -1221,7 +1263,10 @@ async fn controller_loop<C, St>(
                        &mut method_rx,
                        &event_tx,
                        &cancel_tx,
+                        &pause_tx,
                        &shared_state,
+                        &runtime_dir,
+                        None,
                        &notify_buffer,
                        self_parent_socket.as_ref(),
                        &spawner_name,
@@ -1346,7 +1391,7 @@ async fn controller_loop<C, St>(
                        });
                    }
                },
-                WorkerStatus::Idle => {
+                WorkerStatus::Idle | WorkerStatus::Stopped => {
                    let _ = event_tx.send(Event::Error {
                        code: ErrorCode::NotRunning,
                        message: "Worker is not running".into(),
@@ -1387,7 +1432,7 @@ async fn controller_loop<C, St>(
                            .into(),
                    });
                }
-                WorkerStatus::Running => {
+                WorkerStatus::Running | WorkerStatus::Stopped => {
                    let _ = event_tx.send(Event::Error {
                        code: ErrorCode::AlreadyRunning,
                        message:
@@ -1401,7 +1446,7 @@ async fn controller_loop<C, St>(
                WorkerStatus::Idle | WorkerStatus::Paused => {
                    emit_rewind_targets(&worker, &event_tx)
                }
-                WorkerStatus::Running => {
+                WorkerStatus::Running | WorkerStatus::Stopped => {
                    let _ = event_tx.send(Event::Error {
                        code: ErrorCode::AlreadyRunning,
                        message: "Worker is already executing a turn; rewind can only run while idle or paused"
@@ -1430,7 +1475,7 @@ async fn controller_loop<C, St>(
                            .into(),
                    });
                }
-                WorkerStatus::Running => {
+                WorkerStatus::Running | WorkerStatus::Stopped => {
                    let _ = event_tx.send(Event::Error {
                        code: ErrorCode::AlreadyRunning,
                        message: "Worker is already executing a turn; rewind can only run while idle or paused"
@@ -1618,7 +1663,10 @@ async fn drive_turn<F>(
    method_rx: &mut mpsc::Receiver<Method>,
    event_tx: &broadcast::Sender<Event>,
    cancel_tx: &mpsc::Sender<()>,
+    pause_tx: &mpsc::Sender<()>,
    shared_state: &Arc<WorkerSharedState>,
+    runtime_dir: &RuntimeDir,
+    mut input_commit_rx: Option<oneshot::Receiver<()>>,
    notify_buffer: &NotifyBuffer,
    parent_socket: Option<&PathBuf>,
    self_name: &str,
@@ -1634,14 +1682,58 @@ where

    loop {
        tokio::select! {
+            // If input commit and provider completion become ready together, expose
+            // Running only after processing the commit fence. This makes the
+            // Running snapshot contract deterministic even for immediate clients.
+            biased;
+            committed = async {
+                input_commit_rx
+                    .as_mut()
+                    .expect("input commit receiver guarded by select condition")
+                    .await
+            }, if input_commit_rx.is_some() => {
+                input_commit_rx = None;
+                if committed.is_ok() {
+                    set_controller_status(
+                        shared_state,
+                        runtime_dir,
+                        event_tx,
+                        WorkerStatus::Running,
+                    )
+                    .await;
+                }
+            }
            result = &mut worker_future => {
                return match result {
                    Ok(r) => {
                        let (status, run_result) = match r {
+                            WorkerRunResult::Finished if pause_requested => {
+                                (WorkerStatus::Paused, RunResult::Paused)
+                            }
                            WorkerRunResult::Finished => (WorkerStatus::Idle, RunResult::Finished),
                            WorkerRunResult::Paused => (WorkerStatus::Paused, RunResult::Paused),
                            WorkerRunResult::LimitReached => (WorkerStatus::Idle, RunResult::LimitReached),
                            WorkerRunResult::RolledBack => (WorkerStatus::Idle, RunResult::RolledBack),
+                            WorkerRunResult::Interrupted { .. } if pause_requested => {
+                                let _ = event_tx.send(Event::RunEnd { result: RunResult::Paused });
+                                return (WorkerStatus::Paused, shutdown_requested);
+                            }
+                            WorkerRunResult::Interrupted { code, message } => {
+                                let _ = event_tx.send(Event::Error {
+                                    code,
+                                    message: message.clone(),
+                                });
+                                if parent_originated {
+                                    crate::ipc::event::fire_and_forget(
+                                        parent_socket.cloned(),
+                                        protocol::WorkerEvent::Errored {
+                                            worker_name: self_name.to_string(),
+                                            message,
+                                        },
+                                    );
+                                }
+                                return (WorkerStatus::Idle, shutdown_requested);
+                            }
                        };
                        let _ = event_tx.send(Event::RunEnd { result: run_result });
                        if parent_originated && matches!(run_result, RunResult::Finished) {
@@ -1690,7 +1782,7 @@ where
                    }
                    Some(Method::Pause) => {
                        pause_requested = true;
-                        let _ = cancel_tx.try_send(());
+                        let _ = pause_tx.try_send(());
                    }
                    Some(Method::Shutdown) => {
                        shutdown_requested = true;
@@ -1752,7 +1844,7 @@ where

 fn emit_rewind_targets<C, St>(worker: &Worker<C, St>, event_tx: &broadcast::Sender<Event>)
 where
-    C: LlmClient,
+    C: LlmClient + 'static,
    St: Store,
 {
    match worker.list_rewind_targets() {
@@ -1778,7 +1870,7 @@ fn apply_rewind<C, St>(
    expected_head_entries: usize,
 ) -> bool
 where
-    C: LlmClient,
+    C: LlmClient + 'static,
    St: Store,
 {
    match worker.rewind_to(target, expected_head_entries) {
@@ -1826,7 +1918,7 @@ fn model_supports_image_attachments(model: &manifest::ModelManifest) -> bool {

 fn build_greeting<C, St>(worker: &Worker<C, St>) -> protocol::Greeting
 where
-    C: LlmClient,
+    C: LlmClient + 'static,
    St: Store,
 {
    let manifest = worker.manifest();
@@ -1942,11 +2034,13 @@ mod tests {
        event_tx: broadcast::Sender<Event>,
        cancel_tx: mpsc::Sender<()>,
        _cancel_rx: mpsc::Receiver<()>,
+        pause_tx: mpsc::Sender<()>,
+        _pause_rx: mpsc::Receiver<()>,
        shared_state: Arc<WorkerSharedState>,
        notify_buffer: NotifyBuffer,
        spawned_registry: Arc<SpawnedWorkerRegistry>,
        parent_socket_path: PathBuf,
-        _runtime_dir: Arc<RuntimeDir>,
+        runtime_dir: Arc<RuntimeDir>,
        _temp: TempDir,
    }

@@ -1960,6 +2054,7 @@ mod tests {
        let (method_tx, method_rx) = mpsc::channel::<Method>(16);
        let (event_tx, _) = broadcast::channel::<Event>(16);
        let (cancel_tx, cancel_rx) = mpsc::channel::<()>(1);
+        let (pause_tx, pause_rx) = mpsc::channel::<()>(1);
        let shared_state = Arc::new(WorkerSharedState::new(
            "child-worker".to_string(),
            session_store::new_segment_id(),
@@ -1985,11 +2080,13 @@ mod tests {
            event_tx,
            cancel_tx,
            _cancel_rx: cancel_rx,
+            pause_tx,
+            _pause_rx: pause_rx,
            shared_state,
            notify_buffer,
            spawned_registry,
            parent_socket_path,
-            _runtime_dir: runtime_dir,
+            runtime_dir,
            _temp: temp,
        }
    }
@@ -2042,7 +2139,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "child-worker",
@@ -2063,6 +2163,44 @@ mod tests {
        }
    }

+    #[tokio::test]
+    async fn pause_waits_for_run_boundary_and_uses_safe_pause_channel() {
+        let mut env = make_env().await;
+        let method_tx = env._method_tx.clone();
+        tokio::spawn(async move {
+            tokio::time::sleep(Duration::from_millis(10)).await;
+            method_tx.send(Method::Pause).await.expect("send pause");
+        });
+
+        let worker_future = async {
+            tokio::time::sleep(Duration::from_millis(100)).await;
+            Ok::<_, WorkerError>(WorkerRunResult::Finished)
+        };
+        let started_at = std::time::Instant::now();
+        let (status, shutdown) = drive_turn(
+            worker_future,
+            &mut env.method_rx,
+            &env.event_tx,
+            &env.cancel_tx,
+            &env.pause_tx,
+            &env.shared_state,
+            &env.runtime_dir,
+            None,
+            &env.notify_buffer,
+            None,
+            "child-worker",
+            &env.spawned_registry,
+            true,
+        )
+        .await;
+
+        assert_eq!(status, WorkerStatus::Paused);
+        assert!(!shutdown);
+        assert!(started_at.elapsed() >= Duration::from_millis(100));
+        assert!(env._pause_rx.try_recv().is_ok());
+        assert!(env._cancel_rx.try_recv().is_err());
+    }
+
    #[tokio::test]
    async fn non_parent_originated_finished_stays_silent() {
        let mut env = make_env().await;
@@ -2074,7 +2212,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "child-worker",
@@ -2109,7 +2250,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "child-worker",
@@ -2150,7 +2294,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "child-worker",
@@ -2189,7 +2336,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "parent",
@@ -2225,7 +2375,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "parent",
@@ -2259,7 +2412,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "parent",
@@ -2292,7 +2448,10 @@ mod tests {
            &mut env.method_rx,
            &env.event_tx,
            &env.cancel_tx,
+            &env.pause_tx,
            &env.shared_state,
+            &env.runtime_dir,
+            None,
            &env.notify_buffer,
            Some(&env.parent_socket_path),
            "child-worker",
@@ -12,7 +12,7 @@
 //! ordinary feature reports/diagnostics instead of a separate authority layer.

 use std::any::{Any, type_name};
-use std::collections::{HashMap, HashSet};
+use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use std::fmt;
 use std::sync::Arc;

@@ -447,6 +447,16 @@ impl ServiceVersionReq {
            requirement: "*".into(),
        }
    }
+
+    pub fn exact(version: impl Into<String>) -> Self {
+        Self {
+            requirement: version.into(),
+        }
+    }
+
+    fn matches(&self, provider_version: &str) -> bool {
+        self.requirement == "*" || self.requirement == provider_version
+    }
 }

 /// Feature-provided service declaration. This first slice records provider
@@ -1430,30 +1440,34 @@ impl FeatureInstallContext<'_> {
 pub struct FeatureRegistryInstallReport {
    pub reports: Vec<FeatureInstallReport>,
    pub services: FeatureServiceRegistry,
+    pub plan_error: Option<FeaturePlanError>,
 }

 impl FeatureRegistryInstallReport {
    pub fn has_errors(&self) -> bool {
-        self.reports.iter().any(|report| {
-            report
-                .diagnostics
-                .iter()
-                .any(|diagnostic| diagnostic.severity == FeatureDiagnosticSeverity::Error)
-        })
-    }
-
-    pub fn error_message(&self) -> String {
-        self.reports
-            .iter()
-            .flat_map(|report| {
+        self.plan_error.is_some()
+            || self.reports.iter().any(|report| {
                report
                    .diagnostics
                    .iter()
-                    .filter(|diagnostic| diagnostic.severity == FeatureDiagnosticSeverity::Error)
-                    .map(move |diagnostic| format!("{}: {}", report.feature_id, diagnostic.message))
+                    .any(|diagnostic| diagnostic.severity == FeatureDiagnosticSeverity::Error)
            })
-            .collect::<Vec<_>>()
-            .join("; ")
+    }
+
+    pub fn error_message(&self) -> String {
+        let mut errors = self
+            .plan_error
+            .iter()
+            .map(ToString::to_string)
+            .collect::<Vec<_>>();
+        errors.extend(self.reports.iter().flat_map(|report| {
+            report
+                .diagnostics
+                .iter()
+                .filter(|diagnostic| diagnostic.severity == FeatureDiagnosticSeverity::Error)
+                .map(move |diagnostic| format!("{}: {}", report.feature_id, diagnostic.message))
+        }));
+        errors.join("; ")
    }

    pub fn installed_tool_names(&self) -> Vec<String> {
@@ -1485,12 +1499,265 @@ pub fn dedupe_instruction_contributions(
    deduped
 }

+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct PlannedServiceProvider {
+    pub service: ServiceId,
+    pub provider: FeatureId,
+    pub version: String,
+}
+
+/// A validated, deterministic installation order and its selected service providers.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct FeatureInstallPlan {
+    ordered_features: Vec<FeatureId>,
+    service_providers: BTreeMap<ServiceId, PlannedServiceProvider>,
+    ordered_indices: Vec<usize>,
+}
+
+impl FeatureInstallPlan {
+    pub fn ordered_features(&self) -> &[FeatureId] {
+        &self.ordered_features
+    }
+
+    pub fn service_providers(&self) -> &BTreeMap<ServiceId, PlannedServiceProvider> {
+        &self.service_providers
+    }
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, Error)]
+pub enum FeaturePlanError {
+    #[error("feature `{feature}` is registered more than once")]
+    DuplicateFeature { feature: FeatureId },
+    #[error("service `{service}` has multiple selected providers: {providers:?}")]
+    AmbiguousServiceProvider {
+        service: ServiceId,
+        providers: Vec<FeatureId>,
+    },
+    #[error("feature `{consumer}` requires service `{service}`, but no provider is selected")]
+    MissingServiceProvider {
+        consumer: FeatureId,
+        service: ServiceId,
+    },
+    #[error(
+        "feature `{consumer}` requires service `{service}` version `{requirement}`, but provider `{provider}` provides `{provider_version}`"
+    )]
+    ServiceVersionMismatch {
+        consumer: FeatureId,
+        service: ServiceId,
+        requirement: String,
+        provider: FeatureId,
+        provider_version: String,
+    },
+    #[error(
+        "service dependency cycle involves features {features:?} through services {services:?}"
+    )]
+    ServiceDependencyCycle {
+        features: Vec<FeatureId>,
+        services: Vec<ServiceId>,
+    },
+}
+
 /// Builder/installer for enabled feature modules.
-#[derive(Default)]
 pub struct FeatureRegistryBuilder {
    modules: Vec<Arc<dyn FeatureModule>>,
 }

+fn build_feature_install_plan(
+    descriptors: &[FeatureDescriptor],
+) -> Result<FeatureInstallPlan, FeaturePlanError> {
+    let mut feature_ids = BTreeSet::new();
+    for descriptor in descriptors {
+        if !feature_ids.insert(descriptor.id.clone()) {
+            return Err(FeaturePlanError::DuplicateFeature {
+                feature: descriptor.id.clone(),
+            });
+        }
+    }
+
+    let mut provider_candidates: BTreeMap<ServiceId, Vec<(usize, ServiceDeclaration)>> =
+        BTreeMap::new();
+    for (index, descriptor) in descriptors.iter().enumerate() {
+        for service in &descriptor.provides_services {
+            provider_candidates
+                .entry(service.id.clone())
+                .or_default()
+                .push((index, service.clone()));
+        }
+    }
+
+    let mut selected_providers = BTreeMap::new();
+    for (service, candidates) in provider_candidates {
+        if candidates.len() > 1 {
+            let mut providers = candidates
+                .iter()
+                .map(|(index, _)| descriptors[*index].id.clone())
+                .collect::<Vec<_>>();
+            providers.sort();
+            return Err(FeaturePlanError::AmbiguousServiceProvider { service, providers });
+        }
+        let (provider_index, declaration) = candidates
+            .into_iter()
+            .next()
+            .expect("provider candidates are non-empty");
+        selected_providers.insert(service, (provider_index, declaration));
+    }
+
+    let active = (0..descriptors.len()).collect::<BTreeSet<_>>();
+    let mut adjacency = vec![BTreeSet::new(); descriptors.len()];
+    let mut indegree = vec![0usize; descriptors.len()];
+    let mut edge_services: BTreeMap<(usize, usize), BTreeSet<ServiceId>> = BTreeMap::new();
+
+    for &consumer_index in &active {
+        let consumer = &descriptors[consumer_index];
+        for requirement in &consumer.requires_services {
+            let provider = selected_providers.get(&requirement.id);
+            let Some((provider_index, declaration)) = provider else {
+                if requirement.required {
+                    return Err(FeaturePlanError::MissingServiceProvider {
+                        consumer: consumer.id.clone(),
+                        service: requirement.id.clone(),
+                    });
+                }
+                continue;
+            };
+            if !requirement.version.matches(&declaration.version) {
+                return Err(FeaturePlanError::ServiceVersionMismatch {
+                    consumer: consumer.id.clone(),
+                    service: requirement.id.clone(),
+                    requirement: requirement.version.requirement.clone(),
+                    provider: descriptors[*provider_index].id.clone(),
+                    provider_version: declaration.version.clone(),
+                });
+            }
+            if adjacency[*provider_index].insert(consumer_index) {
+                indegree[consumer_index] += 1;
+            }
+            edge_services
+                .entry((*provider_index, consumer_index))
+                .or_default()
+                .insert(requirement.id.clone());
+        }
+    }
+
+    let mut ready = active
+        .iter()
+        .copied()
+        .filter(|index| indegree[*index] == 0)
+        .collect::<BTreeSet<_>>();
+    let mut ordered_indices = Vec::with_capacity(active.len());
+    while let Some(index) = ready.pop_first() {
+        ordered_indices.push(index);
+        for &dependent in &adjacency[index] {
+            indegree[dependent] -= 1;
+            if indegree[dependent] == 0 {
+                ready.insert(dependent);
+            }
+        }
+    }
+
+    if ordered_indices.len() != active.len() {
+        let cycle_indices = find_service_dependency_cycle(&active, &adjacency);
+        let features = cycle_indices
+            .iter()
+            .map(|index| descriptors[*index].id.clone())
+            .collect::<Vec<_>>();
+        let mut services = BTreeSet::new();
+        for edge in cycle_indices.windows(2) {
+            if let Some(ids) = edge_services.get(&(edge[0], edge[1])) {
+                services.extend(ids.iter().cloned());
+            }
+        }
+        if let (Some(first), Some(last)) = (cycle_indices.first(), cycle_indices.last())
+            && let Some(ids) = edge_services.get(&(*last, *first))
+        {
+            services.extend(ids.iter().cloned());
+        }
+        return Err(FeaturePlanError::ServiceDependencyCycle {
+            features,
+            services: services.into_iter().collect(),
+        });
+    }
+
+    let service_providers = selected_providers
+        .into_iter()
+        .map(|(service, (provider_index, declaration))| {
+            let planned = PlannedServiceProvider {
+                service: service.clone(),
+                provider: descriptors[provider_index].id.clone(),
+                version: declaration.version,
+            };
+            (service, planned)
+        })
+        .collect();
+    let ordered_features = ordered_indices
+        .iter()
+        .map(|index| descriptors[*index].id.clone())
+        .collect();
+    Ok(FeatureInstallPlan {
+        ordered_features,
+        service_providers,
+        ordered_indices,
+    })
+}
+
+fn find_service_dependency_cycle(
+    active: &BTreeSet<usize>,
+    adjacency: &[BTreeSet<usize>],
+) -> Vec<usize> {
+    fn visit(
+        index: usize,
+        active: &BTreeSet<usize>,
+        adjacency: &[BTreeSet<usize>],
+        state: &mut [u8],
+        stack: &mut Vec<usize>,
+    ) -> Option<Vec<usize>> {
+        state[index] = 1;
+        stack.push(index);
+        for &next in &adjacency[index] {
+            if !active.contains(&next) {
+                continue;
+            }
+            match state[next] {
+                0 => {
+                    if let Some(cycle) = visit(next, active, adjacency, state, stack) {
+                        return Some(cycle);
+                    }
+                }
+                1 => {
+                    let start = stack
+                        .iter()
+                        .position(|candidate| *candidate == next)
+                        .expect("visiting node is present in DFS stack");
+                    return Some(stack[start..].to_vec());
+                }
+                _ => {}
+            }
+        }
+        stack.pop();
+        state[index] = 2;
+        None
+    }
+
+    let mut state = vec![0u8; adjacency.len()];
+    let mut stack = Vec::new();
+    for &index in active {
+        if state[index] == 0
+            && let Some(cycle) = visit(index, active, adjacency, &mut state, &mut stack)
+        {
+            return cycle;
+        }
+    }
+    Vec::new()
+}
+
+impl Default for FeatureRegistryBuilder {
+    fn default() -> Self {
+        Self {
+            modules: Vec::new(),
+        }
+    }
+}
+
 impl FeatureRegistryBuilder {
    pub fn new() -> Self {
        Self::default()
@@ -1523,10 +1790,14 @@ impl FeatureRegistryBuilder {
            .collect()
    }

+    pub fn plan(&self) -> Result<FeatureInstallPlan, FeaturePlanError> {
+        build_feature_install_plan(&self.descriptors())
+    }
+
    /// Install modules into the existing Engine tool path and hook builder.
-    pub(crate) fn install_into_engine<C: LlmClient>(
+    pub(crate) fn install_into_engine<C: LlmClient, A>(
        self,
-        worker: &mut Engine<C, Mutable>,
+        worker: &mut Engine<C, Mutable, A>,
        hook_builder: &mut HookRegistryBuilder,
    ) -> FeatureRegistryInstallReport {
        let mut pending_tools = Vec::new();
@@ -1568,53 +1839,52 @@ impl FeatureRegistryBuilder {
            .iter()
            .map(|module| module.descriptor())
            .collect();
-        let mut service_registry = FeatureServiceRegistry::default();
-        let mut reports = Vec::with_capacity(self.modules.len());
-        let mut seen_features = HashSet::new();
-
-        let mut pending_modules: Vec<_> = self.modules.into_iter().zip(descriptors).collect();
-        let mut ordered_modules = Vec::with_capacity(pending_modules.len());
-        let mut declared_services = HashSet::new();
-        while !pending_modules.is_empty() {
-            let next = pending_modules
-                .iter()
-                .position(|(_, descriptor)| {
-                    descriptor
-                        .requires_services
-                        .iter()
-                        .filter(|requirement| requirement.required)
-                        .all(|requirement| declared_services.contains(&requirement.id))
-                })
-                .unwrap_or(0);
-            let entry = pending_modules.remove(next);
-            declared_services.extend(
-                entry
-                    .1
-                    .provides_services
+        let plan = match build_feature_install_plan(&descriptors) {
+            Ok(plan) => plan,
+            Err(error) => {
+                let message = error.to_string();
+                let reports = descriptors
                    .iter()
-                    .map(|service| service.id.clone()),
-            );
-            ordered_modules.push(entry);
-        }
+                    .map(|descriptor| {
+                        let mut report = FeatureInstallReport::new(descriptor);
+                        report
+                            .diagnostics
+                            .push(FeatureDiagnostic::error(message.clone()));
+                        report.mark_skipped(
+                            FeatureContributionKind::Diagnostic,
+                            descriptor.id.to_string(),
+                            "feature installation plan rejected before installation",
+                        );
+                        report
+                    })
+                    .collect();
+                return FeatureRegistryInstallReport {
+                    reports,
+                    services: FeatureServiceRegistry::default(),
+                    plan_error: Some(error),
+                };
+            }
+        };
+        let mut service_registry = FeatureServiceRegistry::default();
+        let mut reports = Vec::with_capacity(plan.ordered_indices.len());
+        let mut modules = self.modules.into_iter().map(Some).collect::<Vec<_>>();
+        let ordered_modules = plan
+            .ordered_indices
+            .into_iter()
+            .map(|index| {
+                (
+                    modules[index]
+                        .take()
+                        .expect("planned feature module is selected exactly once"),
+                    descriptors[index].clone(),
+                )
+            })
+            .collect::<Vec<_>>();

        for (module, descriptor) in ordered_modules {
            let declarations = FeatureContributionDeclarations::from_descriptor(&descriptor);
            let mut report = FeatureInstallReport::new(&descriptor);

-            if !seen_features.insert(descriptor.id.clone()) {
-                report.diagnostics.push(FeatureDiagnostic::error(format!(
-                    "duplicate feature id: {}",
-                    descriptor.id
-                )));
-                report.mark_skipped(
-                    FeatureContributionKind::Diagnostic,
-                    descriptor.id.to_string(),
-                    "duplicate feature id",
-                );
-                reports.push(report);
-                continue;
-            }
-
            let mut required_service_failed = false;
            for requirement in descriptor.requires_services.iter().cloned() {
                if service_registry.provides(&requirement.id) {
@@ -1681,6 +1951,7 @@ impl FeatureRegistryBuilder {
        FeatureRegistryInstallReport {
            reports,
            services: service_registry,
+            plan_error: None,
        }
    }
 }
@@ -1821,6 +2092,59 @@ mod tests {
        }
    }

+    struct PlannedServiceFeature {
+        descriptor: FeatureDescriptor,
+        install_calls: Arc<AtomicUsize>,
+        fail_install: bool,
+    }
+
+    impl PlannedServiceFeature {
+        fn new(descriptor: FeatureDescriptor) -> Self {
+            Self {
+                descriptor,
+                install_calls: Arc::new(AtomicUsize::new(0)),
+                fail_install: false,
+            }
+        }
+    }
+
+    impl FeatureModule for PlannedServiceFeature {
+        fn descriptor(&self) -> FeatureDescriptor {
+            self.descriptor.clone()
+        }
+
+        fn install(
+            &self,
+            context: &mut FeatureInstallContext<'_>,
+        ) -> Result<(), FeatureInstallError> {
+            self.install_calls.fetch_add(1, Ordering::SeqCst);
+            if self.fail_install {
+                return Err(FeatureInstallError::Install(
+                    "injected provider failure".into(),
+                ));
+            }
+            for service in &self.descriptor.provides_services {
+                context
+                    .services()
+                    .provide(service.clone(), Arc::new(service.id.to_string()))?;
+            }
+            Ok(())
+        }
+    }
+
+    fn provided_service(id: &'static str, version: &'static str) -> ServiceDeclaration {
+        ServiceDeclaration::new(ServiceId::builtin(id), version, "test service")
+    }
+
+    fn required_service(id: &'static str, version: ServiceVersionReq) -> ServiceRequirement {
+        {
+            let mut requirement =
+                ServiceRequirement::required(ServiceId::builtin(id), "test dependency");
+            requirement.version = version;
+            requirement
+        }
+    }
+
    fn instruction(id: &'static str, prompt_ref: &'static str) -> FeatureInstructionDeclaration {
        FeatureInstructionDeclaration::new(
            FeatureInstructionId::builtin(id),
@@ -1830,6 +2154,249 @@ mod tests {
        .unwrap()
    }

+    #[test]
+    fn install_plan_orders_provider_before_consumer_stably() {
+        let consumer = PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("consumer", "Consumer")
+                .with_service_requirement(required_service("catalog", ServiceVersionReq::any())),
+        );
+        let unrelated =
+            PlannedServiceFeature::new(FeatureDescriptor::builtin("unrelated", "Unrelated"));
+        let provider = PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("provider", "Provider")
+                .with_provided_service(provided_service("catalog", "1")),
+        );
+        let builder = FeatureRegistryBuilder::new()
+            .with_module(consumer)
+            .with_module(unrelated)
+            .with_module(provider);
+
+        let plan = builder.plan().expect("service graph should be valid");
+        assert_eq!(
+            plan.ordered_features(),
+            &[
+                FeatureId::builtin("unrelated"),
+                FeatureId::builtin("provider"),
+                FeatureId::builtin("consumer"),
+            ]
+        );
+    }
+
+    #[test]
+    fn install_plan_orders_compatible_optional_provider_before_consumer() {
+        let service = ServiceId::builtin("catalog");
+        let consumer = PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("consumer", "Consumer").with_service_requirement(
+                ServiceRequirement::optional(service.clone(), "optional catalog"),
+            ),
+        );
+        let provider = PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("provider", "Provider")
+                .with_provided_service(provided_service("catalog", "1")),
+        );
+        let builder = FeatureRegistryBuilder::new()
+            .with_module(consumer)
+            .with_module(provider);
+
+        let plan = builder.plan().expect("optional binding should be valid");
+        assert_eq!(
+            plan.ordered_features(),
+            &[
+                FeatureId::builtin("provider"),
+                FeatureId::builtin("consumer"),
+            ]
+        );
+
+        let mut hooks = HookRegistryBuilder::default();
+        let mut pending_tools = Vec::new();
+        let report = builder.install_into_pending(&mut pending_tools, &mut hooks);
+        assert!(!report.has_errors());
+        let consumer = report
+            .reports
+            .iter()
+            .find(|report| report.feature_id == FeatureId::builtin("consumer"))
+            .expect("consumer report");
+        assert!(
+            consumer
+                .resolved_service_requirements
+                .iter()
+                .any(|requirement| requirement.id == service)
+        );
+    }
+
+    #[test]
+    fn install_plan_rejects_missing_required_service() {
+        let builder = FeatureRegistryBuilder::new().with_module(PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("consumer", "Consumer")
+                .with_service_requirement(required_service("missing", ServiceVersionReq::any())),
+        ));
+
+        assert_eq!(
+            builder.plan(),
+            Err(FeaturePlanError::MissingServiceProvider {
+                consumer: FeatureId::builtin("consumer"),
+                service: ServiceId::builtin("missing"),
+            })
+        );
+    }
+
+    #[test]
+    fn install_plan_rejects_ambiguous_provider_independent_of_registration_order() {
+        fn plan(reverse: bool) -> FeaturePlanError {
+            let provider_a = PlannedServiceFeature::new(
+                FeatureDescriptor::builtin("provider-a", "Provider A")
+                    .with_provided_service(provided_service("catalog", "1")),
+            );
+            let provider_b = PlannedServiceFeature::new(
+                FeatureDescriptor::builtin("provider-b", "Provider B")
+                    .with_provided_service(provided_service("catalog", "1")),
+            );
+            let mut builder = FeatureRegistryBuilder::new();
+            if reverse {
+                builder.add_module(provider_b).add_module(provider_a);
+            } else {
+                builder.add_module(provider_a).add_module(provider_b);
+            }
+            builder.plan().expect_err("duplicate providers must fail")
+        }
+
+        let expected = FeaturePlanError::AmbiguousServiceProvider {
+            service: ServiceId::builtin("catalog"),
+            providers: vec![
+                FeatureId::builtin("provider-a"),
+                FeatureId::builtin("provider-b"),
+            ],
+        };
+        assert_eq!(plan(false), expected);
+        assert_eq!(plan(true), expected);
+    }
+
+    #[test]
+    fn install_plan_rejects_service_version_mismatch() {
+        let builder = FeatureRegistryBuilder::new()
+            .with_module(PlannedServiceFeature::new(
+                FeatureDescriptor::builtin("consumer", "Consumer").with_service_requirement(
+                    required_service("catalog", ServiceVersionReq::exact("2")),
+                ),
+            ))
+            .with_module(PlannedServiceFeature::new(
+                FeatureDescriptor::builtin("provider", "Provider")
+                    .with_provided_service(provided_service("catalog", "1")),
+            ));
+
+        assert_eq!(
+            builder.plan(),
+            Err(FeaturePlanError::ServiceVersionMismatch {
+                consumer: FeatureId::builtin("consumer"),
+                service: ServiceId::builtin("catalog"),
+                requirement: "2".into(),
+                provider: FeatureId::builtin("provider"),
+                provider_version: "1".into(),
+            })
+        );
+    }
+
+    #[test]
+    fn install_plan_reports_service_cycle_members() {
+        let builder = FeatureRegistryBuilder::new()
+            .with_module(PlannedServiceFeature::new(
+                FeatureDescriptor::builtin("alpha", "Alpha")
+                    .with_provided_service(provided_service("alpha-service", "1"))
+                    .with_service_requirement(required_service(
+                        "beta-service",
+                        ServiceVersionReq::any(),
+                    )),
+            ))
+            .with_module(PlannedServiceFeature::new(
+                FeatureDescriptor::builtin("beta", "Beta")
+                    .with_provided_service(provided_service("beta-service", "1"))
+                    .with_service_requirement(required_service(
+                        "alpha-service",
+                        ServiceVersionReq::any(),
+                    )),
+            ));
+
+        let error = builder.plan().expect_err("cycle must fail before install");
+        let FeaturePlanError::ServiceDependencyCycle { features, services } = error else {
+            panic!("unexpected plan error: {error:?}");
+        };
+        assert_eq!(
+            features.into_iter().collect::<BTreeSet<_>>(),
+            BTreeSet::from([FeatureId::builtin("alpha"), FeatureId::builtin("beta")])
+        );
+        assert_eq!(
+            services.into_iter().collect::<BTreeSet<_>>(),
+            BTreeSet::from([
+                ServiceId::builtin("alpha-service"),
+                ServiceId::builtin("beta-service"),
+            ])
+        );
+    }
+
+    #[test]
+    fn plan_failure_has_no_install_side_effects_and_reports_identities() {
+        let first = PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("first", "First")
+                .with_provided_service(provided_service("control", "1")),
+        );
+        let first_calls = Arc::clone(&first.install_calls);
+        let second = PlannedServiceFeature::new(
+            FeatureDescriptor::builtin("second", "Second")
+                .with_provided_service(provided_service("control", "1")),
+        );
+        let second_calls = Arc::clone(&second.install_calls);
+        let mut hook_builder = HookRegistryBuilder::default();
+        let mut pending_tools = Vec::new();
+
+        let report = FeatureRegistryBuilder::new()
+            .with_module(first)
+            .with_module(second)
+            .install_into_pending(&mut pending_tools, &mut hook_builder);
+
+        assert!(report.has_errors());
+        assert!(matches!(
+            report.plan_error,
+            Some(FeaturePlanError::AmbiguousServiceProvider { .. })
+        ));
+        assert!(report.error_message().contains("builtin:control"));
+        assert!(report.error_message().contains("builtin:first"));
+        assert!(report.error_message().contains("builtin:second"));
+        assert_eq!(first_calls.load(Ordering::SeqCst), 0);
+        assert_eq!(second_calls.load(Ordering::SeqCst), 0);
+        assert!(pending_tools.is_empty());
+    }
+
+    #[test]
+    fn provider_install_failure_is_fatal_and_does_not_queue_tools() {
+        let provider_calls = Arc::new(AtomicUsize::new(0));
+        let provider = PlannedServiceFeature {
+            descriptor: FeatureDescriptor::builtin("provider", "Provider")
+                .with_provided_service(provided_service("control", "1")),
+            install_calls: Arc::clone(&provider_calls),
+            fail_install: true,
+        };
+        let consumer = ToolFeature {
+            descriptor: FeatureDescriptor::builtin("consumer", "Consumer")
+                .with_service_requirement(required_service("control", ServiceVersionReq::any()))
+                .with_tool(ToolDeclaration::new("Dependent", "dependent tool")),
+            contribution_name: "Dependent",
+            model_visible_name: "Dependent",
+        };
+        let mut hook_builder = HookRegistryBuilder::default();
+        let mut pending_tools = Vec::new();
+
+        let report = FeatureRegistryBuilder::new()
+            .with_module(consumer)
+            .with_module(provider)
+            .install_into_pending(&mut pending_tools, &mut hook_builder);
+
+        assert!(report.has_errors());
+        assert_eq!(provider_calls.load(Ordering::SeqCst), 1);
+        assert!(pending_tools.is_empty());
+        assert!(report.error_message().contains("builtin:provider"));
+        assert!(report.error_message().contains("injected provider failure"));
+    }
+
    #[test]
    fn descriptor_contributions_are_recorded() {
        let descriptor = FeatureDescriptor::builtin("dummy", "Dummy")
@@ -2382,10 +2949,6 @@ mod tests {
        );
        let consumer = FeatureDescriptor::builtin("consumer", "Consumer")
            .with_service_requirement(ServiceRequirement::required(service.clone(), "needs demo"));
-        let missing_service = ServiceId::builtin("missing-service");
-        let missing = FeatureDescriptor::builtin("missing", "Missing").with_service_requirement(
-            ServiceRequirement::required(missing_service, "needs missing"),
-        );
        let optional_service = ServiceId::builtin("optional-service");
        let optional = FeatureDescriptor::builtin("optional", "Optional").with_service_requirement(
            ServiceRequirement::optional(optional_service, "nice to have"),
@@ -2399,9 +2962,6 @@ mod tests {
            .with_module(ServiceFeature {
                descriptor: consumer,
            })
-            .with_module(ServiceFeature {
-                descriptor: missing,
-            })
            .with_module(ServiceFeature {
                descriptor: optional,
            })
@@ -2413,18 +2973,6 @@ mod tests {
            report.reports[1].resolved_service_requirements[0].id,
            service
        );
-        let missing_report = report
-            .reports
-            .iter()
-            .find(|feature| feature.feature_id == FeatureId::builtin("missing"))
-            .unwrap();
-        assert!(!missing_report.installed);
-        assert!(
-            missing_report
-                .diagnostics
-                .iter()
-                .any(|diagnostic| diagnostic.message.contains("required service requirement"))
-        );
        let optional_report = report
            .reports
            .iter()
@@ -2543,11 +3091,12 @@ mod tests {
            .with_module(ServiceFeature { descriptor })
            .install_into_pending(&mut pending_tools, &mut hook_builder);
        assert!(report.has_errors());
-        assert!(
-            report
-                .error_message()
-                .contains("required service requirement")
-        );
+        assert!(matches!(
+            report.plan_error,
+            Some(FeaturePlanError::MissingServiceProvider { .. })
+        ));
+        assert!(report.error_message().contains("builtin:consumer"));
+        assert!(report.error_message().contains("builtin:missing-service"));
    }

    #[test]
@@ -12,6 +12,7 @@ pub mod memory_extract;
 pub mod merge_request;
 pub mod objective;
 pub mod orchestration;
+mod resource_projection;
 pub mod session_explore;
 pub mod task;
 pub mod ticket;
@@ -560,6 +560,7 @@ where
                attempt.instance_id, attempt.checked_state_revision
            )),
            max_turns: Some(12),
+            engine_configurator: None,
            features,
            required_tools: &[
                "ShowOverview",
@@ -571,6 +572,7 @@ where
                workspace: WorkerWorkspaceContext::no_workspace(),
                filesystem: WorkerFilesystemAuthority::None,
                scope: Scope::empty(),
+                workdir_session: None,
            },
        };
        match run_internal_worker(spec).await {
@@ -356,16 +356,42 @@ pub fn manage_worker_feature(
    }
 }

-#[derive(Clone)]
 pub struct SubWorkerControlFeature {
-    control: Arc<dyn WorkerControlService>,
+    client: Arc<dyn WorkspaceClient>,
+    registry: Arc<SpawnedWorkerRegistry>,
 }

-impl std::fmt::Debug for SubWorkerControlFeature {
-    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        formatter
-            .debug_struct("SubWorkerControlFeature")
-            .finish_non_exhaustive()
+impl SubWorkerControlFeature {
+    pub fn new(client: Arc<dyn WorkspaceClient>, registry: Arc<SpawnedWorkerRegistry>) -> Self {
+        Self { client, registry }
+    }
+}
+
+impl FeatureModule for SubWorkerControlFeature {
+    fn descriptor(&self) -> FeatureDescriptor {
+        FeatureDescriptor::builtin("sub-worker-control", "SubWorker Control")
+            .with_description("Parent-owned SubWorker control service provider")
+            .with_provided_service(ServiceDeclaration::new(
+                ServiceId::builtin(WORKER_CONTROL_SERVICE_ID),
+                WORKER_LIFECYCLE_SERVICE_VERSION,
+                "Parent-owned SubWorker discovery and control operations",
+            ))
+    }
+
+    fn install(&self, context: &mut FeatureInstallContext<'_>) -> Result<(), FeatureInstallError> {
+        let control: Arc<dyn WorkerControlService> = Arc::new(WorkspaceWorkerControlService {
+            workspace_id: self.client.workspace_id().unwrap_or_default().to_string(),
+            client: self.client.clone(),
+            registry: Some(self.registry.clone()),
+        });
+        context.services().provide(
+            ServiceDeclaration::new(
+                ServiceId::builtin(WORKER_CONTROL_SERVICE_ID),
+                WORKER_LIFECYCLE_SERVICE_VERSION,
+                "Parent-owned SubWorker discovery and control operations",
+            ),
+            control,
+        )
    }
 }

@@ -373,38 +399,7 @@ pub fn sub_worker_control_feature(
    client: Arc<dyn WorkspaceClient>,
    registry: Arc<SpawnedWorkerRegistry>,
 ) -> SubWorkerControlFeature {
-    let workspace_id = client.workspace_id().unwrap_or_default().to_string();
-    SubWorkerControlFeature {
-        control: Arc::new(WorkspaceWorkerControlService {
-            client,
-            workspace_id,
-            registry: Some(registry),
-        }),
-    }
-}
-
-impl FeatureModule for SubWorkerControlFeature {
-    fn descriptor(&self) -> FeatureDescriptor {
-        FeatureDescriptor::builtin("sub_worker", "SubWorker")
-            .with_description("Parent-owned SubWorker control authority.")
-            .with_provided_service(ServiceDeclaration::new(
-                ServiceId::builtin(WORKER_CONTROL_SERVICE_ID),
-                WORKER_LIFECYCLE_SERVICE_VERSION,
-                "Known-SubWorker discovery and permission-fenced control operations",
-            ))
-    }
-
-    fn install(&self, context: &mut FeatureInstallContext<'_>) -> Result<(), FeatureInstallError> {
-        context.services().provide(
-            ServiceDeclaration::new(
-                ServiceId::builtin(WORKER_CONTROL_SERVICE_ID),
-                WORKER_LIFECYCLE_SERVICE_VERSION,
-                "Known-SubWorker discovery and permission-fenced control operations",
-            ),
-            self.control.clone(),
-        )?;
-        Ok(())
-    }
+    SubWorkerControlFeature::new(client, registry)
 }

 impl FeatureModule for ManageWorkerFeature {
@@ -1097,6 +1092,42 @@ mod tests {
        assert!(body.get("initial_text").is_none());
    }

+    #[tokio::test]
+    async fn worker_and_sub_worker_providers_are_ambiguous_before_install() {
+        let runtime_base = tempfile::tempdir().unwrap();
+        let runtime_dir = Arc::new(
+            crate::runtime::dir::RuntimeDir::create(runtime_base.path(), "feature-plan")
+                .await
+                .unwrap(),
+        );
+        let registry = SpawnedWorkerRegistry::new(runtime_dir);
+        let client: Arc<dyn WorkspaceClient> = Arc::new(RecordingWorkspaceClient::default());
+        let mut builder = crate::feature::FeatureRegistryBuilder::new();
+        builder.add_module(sub_worker_control_feature(client.clone(), registry.clone()));
+        builder.add_module(manage_worker_feature(client, Some(registry), true));
+
+        assert_eq!(
+            builder.plan(),
+            Err(crate::feature::FeaturePlanError::AmbiguousServiceProvider {
+                service: ServiceId::builtin(WORKER_CONTROL_SERVICE_ID),
+                providers: vec![
+                    crate::feature::FeatureId::builtin("sub-worker-control"),
+                    crate::feature::FeatureId::builtin("worker"),
+                ],
+            })
+        );
+
+        let mut hooks = crate::HookRegistryBuilder::default();
+        let mut pending_tools = Vec::new();
+        let report = builder.install_into_pending(&mut pending_tools, &mut hooks);
+        assert!(matches!(
+            report.plan_error,
+            Some(crate::feature::FeaturePlanError::AmbiguousServiceProvider { .. })
+        ));
+        assert!(pending_tools.is_empty());
+        assert!(report.services.providers().is_empty());
+    }
+
    #[test]
    fn worker_service_can_remain_enabled_without_direct_spawn_surface() {
        let client = Arc::new(RecordingWorkspaceClient::default());
@@ -6,7 +6,9 @@ use memory::backend::{
    MemoryBackendOperation, MemoryBackendOperationResult, MemoryStageCandidateOperation,
 };
 use memory::extract::{CandidateKind, ExtractedCandidate, StagingEvidence};
-use memory::schema::{EvidenceKind, SourceEvidenceRef, SourceRef};
+use memory::schema::{
+    EvidenceKind, EvidenceOrigin, EvidenceOriginKind, SourceEvidenceRef, SourceRef,
+};
 use schemars::JsonSchema;
 use serde::Deserialize;

@@ -174,17 +176,29 @@ impl Tool for StageMemoryCandidateTool {
                "StageMemoryCandidate requires at least one entry_ref".to_string(),
            ));
        }
-        let mut evidence = Vec::with_capacity(params.entry_refs.len());
-        let mut source_refs = Vec::with_capacity(params.entry_refs.len());
+        let mut entries = Vec::with_capacity(params.entry_refs.len());
        for entry_ref in &params.entry_refs {
-            let projection = self.state.view.evidence_for(entry_ref).ok_or_else(|| {
+            entries.push(self.state.view.evidence_for(entry_ref).ok_or_else(|| {
                ToolError::InvalidArgument(format!(
                    "unknown SessionEntryRef {entry_ref:?} for this extraction capture"
                ))
-            })?;
-            evidence.push(staging_evidence(&projection));
-            source_refs.push(source_evidence_ref(&projection));
+            })?);
        }
+        if matches!(params.kind, CandidateKind::Preference)
+            && entries.iter().any(|entry| {
+                !matches!(
+                    entry.origin,
+                    crate::WorkerHistoryProvenance::HumanInput { .. }
+                )
+            })
+        {
+            return Err(ToolError::InvalidArgument(
+                "preference candidates require exclusively HumanInput evidence; model, Worker, Flow, backend, derived, and legacy-unknown origins are not preference authority"
+                    .to_string(),
+            ));
+        }
+        let evidence = entries.iter().map(staging_evidence).collect();
+        let source_refs = entries.iter().map(source_evidence_ref).collect();
        let candidate = ExtractedCandidate {
            kind: params.kind,
            claim: params.claim,
@@ -310,11 +324,65 @@ fn evidence_kind(entry: &SessionEntryEvidence) -> EvidenceKind {
    }
 }

+fn evidence_origin(origin: &crate::WorkerHistoryProvenance) -> EvidenceOrigin {
+    use crate::WorkerHistoryProvenance as Origin;
+    let mut evidence = EvidenceOrigin {
+        kind: EvidenceOriginKind::LegacyUnknown,
+        account_id: None,
+        workspace_id: None,
+        runtime_id: None,
+        worker_id: None,
+        flow_selector: None,
+        flow_definition_id: None,
+        flow_definition_revision: None,
+    };
+    match origin {
+        Origin::HumanInput { account_id } => {
+            evidence.kind = EvidenceOriginKind::HumanInput;
+            evidence.account_id = Some(account_id.clone());
+        }
+        Origin::WorkerInput { actor } => {
+            evidence.kind = EvidenceOriginKind::WorkerInput;
+            evidence.workspace_id = actor.workspace_id.clone();
+            evidence.runtime_id = actor.runtime_id.clone();
+            evidence.worker_id = Some(actor.worker_id.clone());
+        }
+        Origin::FlowInstruction {
+            selector,
+            definition_id,
+            definition_revision,
+            ..
+        } => {
+            evidence.kind = EvidenceOriginKind::FlowInstruction;
+            evidence.flow_selector = Some(selector.clone());
+            evidence.flow_definition_id = Some(definition_id.clone());
+            evidence.flow_definition_revision = Some(*definition_revision);
+        }
+        Origin::BackendInstruction { .. } => evidence.kind = EvidenceOriginKind::BackendInstruction,
+        Origin::ModelOutput { worker } => {
+            evidence.kind = EvidenceOriginKind::ModelOutput;
+            evidence.workspace_id = worker.workspace_id.clone();
+            evidence.runtime_id = worker.runtime_id.clone();
+            evidence.worker_id = Some(worker.worker_id.clone());
+        }
+        Origin::ToolOutput { worker } => {
+            evidence.kind = EvidenceOriginKind::ToolOutput;
+            evidence.workspace_id = worker.workspace_id.clone();
+            evidence.runtime_id = worker.runtime_id.clone();
+            evidence.worker_id = Some(worker.worker_id.clone());
+        }
+        Origin::DerivedSummary => evidence.kind = EvidenceOriginKind::DerivedSummary,
+        Origin::LegacyUnknown => evidence.kind = EvidenceOriginKind::LegacyUnknown,
+    }
+    evidence
+}
+
 fn staging_evidence(entry: &SessionEntryEvidence) -> StagingEvidence {
    StagingEvidence {
        id: entry.entry_ref.to_string(),
        kind: evidence_kind(entry),
        entry_range: Some(entry.entry_range),
+        origin: Some(evidence_origin(&entry.origin)),
        excerpt: Some(entry.excerpt.clone()),
        summary: Some(entry.summary.clone()),
    }
@@ -325,6 +393,7 @@ fn source_evidence_ref(entry: &SessionEntryEvidence) -> SourceEvidenceRef {
        segment_id: Some(entry.segment_id.clone()),
        entry_range: Some(entry.entry_range),
        evidence_id: Some(entry.entry_ref.to_string()),
+        origin: Some(evidence_origin(&entry.origin)),
        evidence_kind: Some(evidence_kind(entry)),
        label: Some(entry.label.clone()),
        summary: Some(entry.summary.clone()),
@@ -432,6 +501,15 @@ mod tests {
        assert!(input.contains("StageMemoryCandidate.entry_refs"));
    }

+    #[test]
+    fn human_origin_projects_account_authority_into_evidence() {
+        let origin = evidence_origin(&crate::WorkerHistoryProvenance::HumanInput {
+            account_id: "account-1".into(),
+        });
+        assert_eq!(origin.kind, EvidenceOriginKind::HumanInput);
+        assert_eq!(origin.account_id.as_deref(), Some("account-1"));
+    }
+
    #[test]
    fn backend_input_failures_remain_invalid_argument_tool_errors() {
        let backend = map_memory_stage_error(WorkspaceMemoryBackendError::Backend(
@@ -445,6 +523,19 @@ mod tests {
        assert!(matches!(http, ToolError::InvalidArgument(_)));
    }

+    #[tokio::test]
+    async fn preference_rejects_legacy_unknown_before_backend_mutation() {
+        let tool = StageMemoryCandidateTool { state: state() };
+        let error = tool
+            .execute(
+                r#"{"kind":"preference","claim":"claim","why_useful":"useful","entry_refs":["E00000000"]}"#,
+                agen::tool::ToolExecutionContext::direct(),
+            )
+            .await
+            .unwrap_err();
+        assert!(format!("{error:?}").contains("exclusively HumanInput evidence"));
+    }
+
    #[tokio::test]
    async fn stage_rejects_entry_ref_outside_capture_before_backend_mutation() {
        let tool = StageMemoryCandidateTool { state: state() };
@@ -50,11 +50,11 @@ struct MergeRequestTool {
    kind: Kind,
 }
 #[derive(Debug, Deserialize, JsonSchema)]
-struct ShowInput {
+struct TicketInput {
    ticket: String,
 }
 #[derive(Debug, Deserialize, JsonSchema)]
-struct OpenInput {
+struct OpenMergeRequestInput {
    ticket: String,
    repository_id: String,
    selector_from: String,
@@ -63,7 +63,7 @@ struct OpenInput {
    summary: String,
 }
 #[derive(Debug, Deserialize, JsonSchema)]
-struct CompleteInput {
+struct CompleteMergeRequestInput {
    ticket: String,
    operation_id: String,
    approval_event_id: String,
@@ -86,7 +86,7 @@ enum MergeResolutionInput {
    ConflictsResolved,
 }
 #[derive(Debug, Deserialize, JsonSchema)]
-struct ReviewInput {
+struct ReviewMergeRequestInput {
    decision: ReviewDecisionInput,
    #[serde(default)]
    body: String,
@@ -133,19 +133,19 @@ impl Kind {

    fn name(self) -> &'static str {
        match self {
-            Self::Show => "MergeRequestShow",
-            Self::Readiness => "MergeRequestReadinessCheck",
-            Self::Open => "MergeRequestOpen",
-            Self::Complete => "MergeRequestComplete",
-            Self::Review => "MergeRequestReview",
+            Self::Show => "ShowMergeRequest",
+            Self::Readiness => "CheckMergeRequestReadiness",
+            Self::Open => "OpenMergeRequest",
+            Self::Complete => "CompleteMergeRequest",
+            Self::Review => "ReviewMergeRequest",
        }
    }
    fn schema(self) -> serde_json::Value {
        match self {
-            Self::Show | Self::Readiness => json!(schemars::schema_for!(ShowInput)),
-            Self::Open => json!(schemars::schema_for!(OpenInput)),
-            Self::Complete => json!(schemars::schema_for!(CompleteInput)),
-            Self::Review => json!(schemars::schema_for!(ReviewInput)),
+            Self::Show | Self::Readiness => json!(schemars::schema_for!(TicketInput)),
+            Self::Open => json!(schemars::schema_for!(OpenMergeRequestInput)),
+            Self::Complete => json!(schemars::schema_for!(CompleteMergeRequestInput)),
+            Self::Review => json!(schemars::schema_for!(ReviewMergeRequestInput)),
        }
    }
 }
@@ -156,13 +156,13 @@ impl Tool for MergeRequestTool {
            ToolError::ExecutionFailed("Merge Request tools require Workspace identity".into())
        })?;
        if matches!(self.kind, Kind::Show) {
-            let value: ShowInput = parse(input)?;
+            let value: TicketInput = parse(input)?;
            nonempty(&value.ticket)?;
            return self.show_current_merge_request(ws, &value.ticket);
        }
        let (method, path, body) = match self.kind {
            Kind::Readiness => {
-                let v: ShowInput = parse(input)?;
+                let v: TicketInput = parse(input)?;
                nonempty(&v.ticket)?;
                (
                    WorkspaceRequestMethod::Get,
@@ -170,9 +170,9 @@ impl Tool for MergeRequestTool {
                    None,
                )
            }
-            Kind::Show => unreachable!("MergeRequestShow is handled above"),
+            Kind::Show => unreachable!("ShowMergeRequest is handled above"),
            Kind::Open => {
-                let v: OpenInput = parse(input)?;
+                let v: OpenMergeRequestInput = parse(input)?;
                nonempty(&v.ticket)?;
                (
                    WorkspaceRequestMethod::Post,
@@ -183,7 +183,7 @@ impl Tool for MergeRequestTool {
                )
            }
            Kind::Complete => {
-                let v: CompleteInput = parse(input)?;
+                let v: CompleteMergeRequestInput = parse(input)?;
                nonempty(&v.ticket)?;
                (
                    WorkspaceRequestMethod::Post,
@@ -194,7 +194,7 @@ impl Tool for MergeRequestTool {
                )
            }
            Kind::Review => {
-                let v: ReviewInput = parse(input)?;
+                let v: ReviewMergeRequestInput = parse(input)?;
                let ctx = self.client.reviewer_context().ok_or_else(|| {
                    ToolError::ExecutionFailed(
                        "Review submit requires injected Reviewer capability".into(),
@@ -397,19 +397,21 @@ impl FeatureModule for MergeRequestFeature {

 pub fn description(n: &str) -> Option<&'static str> {
    match n {
-        "MergeRequestShow" => Some("Read the selector-based Merge Request and append-only thread."),
-        "MergeRequestReadinessCheck" => {
-            Some("Resolve current provider refs and derive readiness from valid review events.")
-        }
-        "MergeRequestOpen" => {
-            Some("Open a Merge Request with immutable source and target selectors.")
-        }
-        "MergeRequestComplete" => {
-            Some("Complete using an approved review event and final target-ref evidence.")
-        }
-        "MergeRequestReview" => {
-            Some("Submit the injected Reviewer capability result for its captured subject ref.")
-        }
+        "ShowMergeRequest" => Some(
+            "Read the selector-based Merge Request, append-only thread, source-review freshness, and target-integration evidence before review, fix, or handoff decisions.",
+        ),
+        "CheckMergeRequestReadiness" => Some(
+            "Resolve current provider refs and derive readiness from exact-source review evidence; source movement requires fresh review while target-only movement preserves unchanged-source approval.",
+        ),
+        "OpenMergeRequest" => Some(
+            "Open the Ticket's one Merge Request with immutable source and target selectors; reuse it and advance only selector_from with a normal non-force push for later fixes.",
+        ),
+        "CompleteMergeRequest" => Some(
+            "Record Orchestrator-owned integration using unchanged-source approval and refreshed final target-ref evidence.",
+        ),
+        "ReviewMergeRequest" => Some(
+            "Submit the injected Reviewer capability result for its captured exact source ref; source movement cancels it, while target-only movement does not.",
+        ),
        _ => None,
    }
 }
@@ -469,6 +471,31 @@ mod tests {
        }
    }

+    #[test]
+    fn model_facing_operations_use_only_verb_first_names() {
+        for name in [
+            "ShowMergeRequest",
+            "CheckMergeRequestReadiness",
+            "OpenMergeRequest",
+            "CompleteMergeRequest",
+            "ReviewMergeRequest",
+        ] {
+            assert!(description(name).is_some(), "missing operation {name}");
+        }
+        for legacy in [
+            "MergeRequestShow",
+            "MergeRequestReadinessCheck",
+            "MergeRequestOpen",
+            "MergeRequestComplete",
+            "MergeRequestReview",
+        ] {
+            assert!(
+                description(legacy).is_none(),
+                "legacy alias {legacy} must not remain registered"
+            );
+        }
+    }
+
    #[tokio::test]
    async fn show_resolves_ticket_projection_then_reads_canonical_resource() {
        let client = Arc::new(RecordingWorkspaceClient::new(vec![
@@ -546,7 +573,7 @@ mod tests {
            open: true,
            ..Default::default()
        };
-        assert_eq!(tool_names(coder), ["MergeRequestShow", "MergeRequestOpen"]);
+        assert_eq!(tool_names(coder), ["ShowMergeRequest", "OpenMergeRequest"]);

        let reviewer = MergeRequestFeatureConfig {
            show: true,
@@ -555,7 +582,7 @@ mod tests {
        };
        assert_eq!(
            tool_names(reviewer),
-            ["MergeRequestShow", "MergeRequestReview"]
+            ["ShowMergeRequest", "ReviewMergeRequest"]
        );

        let orchestrator = MergeRequestFeatureConfig {
@@ -567,9 +594,9 @@ mod tests {
        assert_eq!(
            tool_names(orchestrator),
            [
-                "MergeRequestShow",
-                "MergeRequestReadinessCheck",
-                "MergeRequestComplete"
+                "ShowMergeRequest",
+                "CheckMergeRequestReadiness",
+                "CompleteMergeRequest"
            ]
        );
        assert_eq!(install(coder).1, [FEATURE_PROMPT_REF]);
@@ -581,8 +608,8 @@ mod tests {
    #[test]
    fn schemas_hide_revision_and_commit_authority() {
        let schemas = [
-            schemars::schema_for!(OpenInput),
-            schemars::schema_for!(CompleteInput),
+            schemars::schema_for!(OpenMergeRequestInput),
+            schemars::schema_for!(CompleteMergeRequestInput),
        ];
        for s in schemas {
            let j = serde_json::to_string(&s).unwrap();
@@ -14,6 +14,8 @@ use serde_json::json;

 use crate::worker::{WorkspaceClient, WorkspaceRequest, WorkspaceRequestMethod};

+use super::resource_projection::{project_objective_detail, project_objective_query};
+
 #[derive(Clone, Debug)]
 pub struct WorkspaceHttpObjectiveBackend {
    client: Arc<dyn WorkspaceClient>,
@@ -37,6 +39,7 @@ impl WorkspaceHttpObjectiveBackend {
        )
        .await
        .map_err(backend_error)?;
+        let response = project_objective_query(response).map_err(ToolError::ExecutionFailed)?;
        Ok(ToolOutput {
            summary: "Queried Objectives".to_string(),
            content: Some(serde_json::to_string_pretty(&response).map_err(decode_error)?),
@@ -58,8 +61,10 @@ impl WorkspaceHttpObjectiveBackend {
        )
        .await
        .map_err(backend_error)?;
+        let response = project_objective_detail(response).map_err(ToolError::ExecutionFailed)?;
+        let objective_ref = response.objective_ref().to_string();
        Ok(ToolOutput {
-            summary: format!("Read objective {id}"),
+            summary: format!("Read objective {objective_ref}"),
            content: Some(serde_json::to_string_pretty(&response).map_err(decode_error)?),
            attachments: Vec::new(),
        })
@@ -84,7 +89,7 @@ impl WorkspaceHttpObjectiveBackend {
        .await
        .map_err(backend_error)?;
        Ok(objective_output(
-            format!("Created objective {}", response.id),
+            format!("Created objective {}", &response.resource_key),
            response,
        )?)
    }
@@ -112,7 +117,7 @@ impl WorkspaceHttpObjectiveBackend {
        .await
        .map_err(backend_error)?;
        Ok(objective_output(
-            format!("Edited objective {}", response.id),
+            format!("Edited objective {}", &response.resource_key),
            response,
        )?)
    }
@@ -134,7 +139,7 @@ impl WorkspaceHttpObjectiveBackend {
        .await
        .map_err(backend_error)?;
        Ok(objective_output(
-            format!("Updated objective {} state", response.id),
+            format!("Updated objective {} state", &response.resource_key),
            response,
        )?)
    }
@@ -142,6 +147,7 @@ impl WorkspaceHttpObjectiveBackend {
    async fn link_ticket(&self, input: ObjectiveLinkTicketInput) -> Result<ToolOutput, ToolError> {
        let id = validate_id(&input.id, "ObjectiveLinkTicket")?;
        let ticket_id = validate_id(&input.ticket_id, "ObjectiveLinkTicket")?;
+        let ticket_resource_key = self.ticket_resource_key(ticket_id).await?;
        let url = format!("{}/ticket-links", self.objective_url(id));
        let response = send_json::<ObjectiveLinkTicketRequest, ObjectiveDetail>(
            self.client.as_ref(),
@@ -154,7 +160,10 @@ impl WorkspaceHttpObjectiveBackend {
        .await
        .map_err(backend_error)?;
        Ok(objective_output(
-            format!("Linked ticket {ticket_id} to objective {}", response.id),
+            format!(
+                "Linked ticket {ticket_resource_key} to objective {}",
+                &response.resource_key
+            ),
            response,
        )?)
    }
@@ -165,16 +174,44 @@ impl WorkspaceHttpObjectiveBackend {
    ) -> Result<ToolOutput, ToolError> {
        let id = validate_id(&input.id, "ObjectiveUnlinkTicket")?;
        let ticket_id = validate_id(&input.ticket_id, "ObjectiveUnlinkTicket")?;
+        let ticket_resource_key = self.ticket_resource_key(ticket_id).await?;
        let url = format!("{}/ticket-links/{}", self.objective_url(id), ticket_id);
        let response = delete_json::<ObjectiveDetail>(self.client.as_ref(), &url)
            .await
            .map_err(backend_error)?;
        Ok(objective_output(
-            format!("Unlinked ticket {ticket_id} from objective {}", response.id),
+            format!(
+                "Unlinked ticket {ticket_resource_key} from objective {}",
+                &response.resource_key
+            ),
            response,
        )?)
    }

+    async fn ticket_resource_key(&self, ticket_reference: &str) -> Result<String, ToolError> {
+        let workspace_id = self.client.workspace_id().unwrap_or_default();
+        let response: serde_json::Value = decode_response(
+            self.client
+                .execute(WorkspaceRequest::get(format!(
+                    "/api/w/{workspace_id}/tickets/{ticket_reference}"
+                )))
+                .map_err(WorkspaceObjectiveBackendError::from)
+                .map_err(backend_error)?,
+        )
+        .map_err(backend_error)?;
+        response
+            .get("resource_key")
+            .or_else(|| {
+                response
+                    .get("meta")
+                    .and_then(|meta| meta.get("resource_key"))
+            })
+            .and_then(serde_json::Value::as_str)
+            .filter(|key| is_canonical_resource_key(key, "T-"))
+            .map(ToOwned::to_owned)
+            .ok_or_else(|| ToolError::ExecutionFailed("required T- key is unavailable".to_string()))
+    }
+
    fn objective_url(&self, id: &str) -> String {
        let workspace_id = self.client.workspace_id().unwrap_or_default();
        format!("/api/w/{workspace_id}/objectives/{id}")
@@ -185,7 +222,7 @@ impl WorkspaceHttpObjectiveBackend {
 pub enum WorkspaceObjectiveBackendError {
    #[error("workspace objective backend request failed: {0}")]
    Request(#[from] crate::worker::WorkspaceClientError),
-    #[error("workspace objective backend returned HTTP {status}: {body}")]
+    #[error("workspace objective backend returned HTTP {status}")]
    Http {
        status: reqwest::StatusCode,
        body: String,
@@ -247,10 +284,26 @@ fn decode_response<T: for<'de> Deserialize<'de>>(
    serde_json::from_str(&response.body).map_err(Into::into)
 }

+fn is_canonical_resource_key(resource_key: &str, prefix: &str) -> bool {
+    resource_key.strip_prefix(prefix).is_some_and(|sequence| {
+        !sequence.is_empty() && sequence.bytes().all(|byte| byte.is_ascii_digit())
+    })
+}
+
 fn objective_output(summary: String, response: ObjectiveDetail) -> Result<ToolOutput, ToolError> {
+    if !is_canonical_resource_key(&response.resource_key, "O-") {
+        return Err(ToolError::ExecutionFailed(
+            "required O- key is unavailable".to_string(),
+        ));
+    }
+    let projected = serde_json::json!({
+        "objective": &response.resource_key,
+        "title": response.title,
+        "state": response.state,
+    });
    Ok(ToolOutput {
        summary,
-        content: Some(serde_json::to_string_pretty(&response).map_err(decode_error)?),
+        content: Some(serde_json::to_string_pretty(&projected).map_err(decode_error)?),

        attachments: Vec::new(),
    })
@@ -260,7 +313,7 @@ fn validate_id<'a>(id: &'a str, tool_name: &str) -> Result<&'a str, ToolError> {
    let id = id.trim();
    if id.is_empty() || id.contains('/') {
        return Err(ToolError::InvalidArgument(format!(
-            "{tool_name} requires non-empty canonical id without '/'"
+            "{tool_name} requires a non-empty Objective reference without '/'"
        )));
    }
    Ok(id)
@@ -411,9 +464,9 @@ const EDIT_DESCRIPTION: &str =
 const SET_STATE_DESCRIPTION: &str =
    "Set an Objective state through Backend Workspace API authority.";
 const LINK_TICKET_DESCRIPTION: &str =
-    "Link a Ticket id to an Objective through Backend Workspace API authority.";
+    "Link a Ticket reference to an Objective through Backend Workspace API authority.";
 const UNLINK_TICKET_DESCRIPTION: &str =
-    "Unlink a Ticket id from an Objective through Backend Workspace API authority.";
+    "Unlink a Ticket reference from an Objective through Backend Workspace API authority.";

 fn list_schema() -> serde_json::Value {
    json!({
@@ -422,7 +475,7 @@ fn list_schema() -> serde_json::Value {
        "properties":{
            "query":{"type":["string","null"]},
            "states":{"type":"array","items":{"type":"string"},"default":[]},
-            "linked_ticket_id":{"type":["string","null"]},
+            "linked_ticket_id":{"type":["string","null"],"description":"Linked Ticket reference. Prefer T-*; canonical internal ids remain accepted for compatibility."},
            "updated_after":{"type":["string","null"]},
            "updated_before":{"type":["string","null"]},
            "sort":{"type":["string","null"],"enum":["relevance","updated_desc","created_desc","title",null]},
@@ -438,7 +491,7 @@ fn show_schema() -> serde_json::Value {
        "additionalProperties": false,
        "required":["id"],
        "properties":{
-            "id":{"type":"string"},
+            "id":{"type":"string","description":"Objective reference. Prefer O-*; canonical internal ids remain accepted for compatibility."},
            "event_limit":{"type":["integer","null"],"minimum":1,"maximum":50},
            "event_cursor":{"type":["string","null"]}
        }
@@ -454,7 +507,7 @@ fn create_schema() -> serde_json::Value {
            "title":{"type":"string","minLength":1},
            "body_md":{"type":"string"},
            "state":{"type":"string","default":"active"},
-            "linked_tickets":{"type":"array","items":{"type":"string"}}
+            "linked_tickets":{"type":"array","items":{"type":"string"},"description":"Linked Ticket references. Prefer T-*; canonical internal ids remain accepted for compatibility."}
        }
    })
 }
@@ -465,7 +518,7 @@ fn edit_schema() -> serde_json::Value {
        "additionalProperties": false,
        "required":["id"],
        "properties":{
-            "id":{"type":"string"},
+            "id":{"type":"string","description":"Objective reference. Prefer O-*; canonical internal ids remain accepted for compatibility."},
            "title":{"type":["string","null"]},
            "old_string":{"type":["string","null"]},
            "new_string":{"type":["string","null"]},
@@ -480,7 +533,7 @@ fn set_state_schema() -> serde_json::Value {
        "additionalProperties": false,
        "required":["id","state"],
        "properties":{
-            "id":{"type":"string"},
+            "id":{"type":"string","description":"Objective reference. Prefer O-*; canonical internal ids remain accepted for compatibility."},
            "state":{"type":"string","minLength":1}
        }
    })
@@ -500,8 +553,8 @@ fn id_ticket_schema(required: &[&str]) -> serde_json::Value {
        "additionalProperties": false,
        "required": required,
        "properties":{
-            "id":{"type":"string"},
-            "ticket_id":{"type":"string"}
+            "id":{"type":"string","description":"Objective reference. Prefer O-*; canonical internal ids remain accepted for compatibility."},
+            "ticket_id":{"type":"string","description":"Ticket reference. Prefer T-*; canonical internal ids remain accepted for compatibility."}
        }
    })
 }
@@ -595,21 +648,20 @@ fn default_state() -> String {

 #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
 struct ObjectiveDetail {
-    id: String,
+    resource_key: String,
    title: String,
    state: String,
-    created_at: Option<String>,
-    updated_at: Option<String>,
-    linked_tickets: Vec<String>,
-    body: String,
-    body_truncated: bool,
-    record_source: String,
 }

 #[cfg(test)]
 mod tests {
    use super::*;
    use agen::tool::ToolDefinition;
+    use std::{
+        io::{Read, Write},
+        net::TcpListener,
+        thread,
+    };

    fn tool_names(definitions: Vec<ToolDefinition>) -> Vec<String> {
        let mut names = definitions
@@ -656,4 +708,135 @@ mod tests {
        let link = link_ticket_schema();
        assert_eq!(link["required"], json!(["id", "ticket_id"]));
    }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn objective_show_summary_uses_projected_key() {
+        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+        let base_url = format!("http://{}", listener.local_addr().unwrap());
+        let server = thread::spawn(move || {
+            let (mut stream, _) = listener.accept().unwrap();
+            let mut buffer = [0_u8; 8192];
+            let len = stream.read(&mut buffer).unwrap();
+            let request = String::from_utf8_lossy(&buffer[..len]);
+            assert!(
+                request.starts_with("POST /api/w/workspace/objectives/00001INTERNAL/show HTTP/1.1")
+            );
+            let body = serde_json::json!({
+                "id": "00001INTERNAL",
+                "resource_key": "O-3",
+                "title": "Objective",
+                "body": "Body",
+                "state": "active",
+                "created_at": null,
+                "updated_at": null,
+                "linked_ticket_summaries": [],
+                "events": [],
+                "event_page": {"next_cursor": null, "has_more": false}
+            })
+            .to_string();
+            write!(
+                stream,
+                "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                body.len(),
+                body
+            )
+            .unwrap();
+        });
+        let backend = WorkspaceHttpObjectiveBackend::new(Arc::new(
+            crate::worker::TestWorkspaceHttpClient::new("workspace", base_url),
+        ));
+
+        let output = backend
+            .show(ShowObjectiveInput {
+                id: "00001INTERNAL".to_string(),
+                event_limit: None,
+                event_cursor: None,
+            })
+            .await
+            .unwrap();
+
+        server.join().unwrap();
+        assert_eq!(output.summary, "Read objective O-3");
+        assert!(!output.summary.contains("00001INTERNAL"));
+        assert!(!output.content.unwrap().contains("00001INTERNAL"));
+    }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn objective_link_summaries_resolve_internal_ticket_ids_to_keys() {
+        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+        let base_url = format!("http://{}", listener.local_addr().unwrap());
+        let server = thread::spawn(move || {
+            for mutation in ["POST", "DELETE"] {
+                let (mut stream, _) = listener.accept().unwrap();
+                let mut buffer = [0_u8; 8192];
+                let len = stream.read(&mut buffer).unwrap();
+                let request = String::from_utf8_lossy(&buffer[..len]);
+                assert!(request.starts_with("GET /api/w/workspace/tickets/00001INTERNAL HTTP/1.1"));
+                let response_body = serde_json::json!({"resource_key": "T-7"}).to_string();
+                write!(
+                    stream,
+                    "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                    response_body.len(),
+                    response_body
+                )
+                .unwrap();
+
+                let (mut stream, _) = listener.accept().unwrap();
+                let mut buffer = [0_u8; 8192];
+                let len = stream.read(&mut buffer).unwrap();
+                let request = String::from_utf8_lossy(&buffer[..len]);
+                assert!(request.starts_with(&format!(
+                    "{mutation} /api/w/workspace/objectives/O-3/ticket-links"
+                )));
+                let response_body = serde_json::json!({
+                    "resource_key": "O-3",
+                    "title": "Objective",
+                    "state": "active"
+                })
+                .to_string();
+                write!(
+                    stream,
+                    "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                    response_body.len(),
+                    response_body
+                )
+                .unwrap();
+            }
+        });
+        let backend = WorkspaceHttpObjectiveBackend::new(Arc::new(
+            crate::worker::TestWorkspaceHttpClient::new("workspace", base_url),
+        ));
+
+        let linked = backend
+            .link_ticket(ObjectiveLinkTicketInput {
+                id: "O-3".to_string(),
+                ticket_id: "00001INTERNAL".to_string(),
+            })
+            .await
+            .unwrap();
+        let unlinked = backend
+            .unlink_ticket(ObjectiveUnlinkTicketInput {
+                id: "O-3".to_string(),
+                ticket_id: "00001INTERNAL".to_string(),
+            })
+            .await
+            .unwrap();
+
+        server.join().unwrap();
+        for output in [linked, unlinked] {
+            assert!(output.summary.contains("T-7"));
+            assert!(!output.summary.contains("00001INTERNAL"));
+            assert!(!output.content.unwrap().contains("00001INTERNAL"));
+        }
+    }
+
+    #[test]
+    fn objective_output_rejects_noncanonical_keys() {
+        let response = ObjectiveDetail {
+            resource_key: "O-internal".to_string(),
+            title: "Objective".to_string(),
+            state: "active".to_string(),
+        };
+        assert!(objective_output("created".to_string(), response).is_err());
+    }
 }
@@ -89,18 +89,19 @@ impl Tool for SpawnTicketCoderTool {
        let input: SpawnTicketCoderInput = serde_json::from_str(input_json).map_err(|error| {
            ToolError::InvalidArgument(format!("invalid {TOOL_NAME} input: {error}"))
        })?;
-        let ticket_id = authority_id(input.ticket_id, "ticket_id")?;
-        let workflow_state = self
+        let ticket_ref = authority_id(input.ticket_id, "ticket_id")?;
+        let ticket = self
            .ticket_service
-            .workflow_state(&ticket_id)
+            .ticket_handoff(&ticket_ref)
            .map_err(|error| ToolError::ExecutionFailed(error.to_string()))?;
        if !matches!(
-            workflow_state,
+            ticket.workflow_state,
            ticket::TicketWorkflowState::Queued | ticket::TicketWorkflowState::InProgress
        ) {
            return Err(ToolError::ExecutionFailed(format!(
-                "Ticket {ticket_id} must be queued or inprogress before spawning its Coder; current state is {}",
-                workflow_state.as_str()
+                "Ticket {} must be queued or inprogress before spawning its Coder; current state is {}",
+                ticket.resource_key,
+                ticket.workflow_state.as_str()
            )));
        }
        let call_id = non_empty(ctx.call_id, "tool call_id")?;
@@ -115,14 +116,14 @@ impl Tool for SpawnTicketCoderTool {
                )?,
                relative_cwd,
                profile: CODER_PROFILE.to_string(),
-                ticket_id: Some(ticket_id.clone()),
-                operation_id: Some(format!("spawn-ticket-coder:{ticket_id}:{call_id}")),
-                display_name: format!("Coder · {ticket_id}"),
+                ticket_id: Some(ticket.id.clone()),
+                operation_id: Some(format!("spawn-ticket-coder:{}:{call_id}", ticket.id)),
+                display_name: format!("Coder · {}", ticket.resource_key),
                initial_submit: vec![
                    Segment::Flow {
                        selector: CODER_FLOW.to_string(),
                    },
-                    Segment::text(format!("Implement Ticket {ticket_id}.")),
+                    Segment::text(format!("Implement Ticket {}.", ticket.resource_key)),
                ],
            })
            .await
@@ -134,7 +135,7 @@ impl Tool for SpawnTicketCoderTool {
            )));
        }
        Ok(ToolOutput {
-            summary: format!("Spawned Coder for Ticket {ticket_id}"),
+            summary: format!("Spawned Coder for Ticket {}", ticket.resource_key),
            content: Some(response.body),
            attachments: Vec::new(),
        })
@@ -201,21 +202,31 @@ mod tests {
    use crate::worker::{WorkspaceClientError, WorkspaceResponse};

    use super::*;
+    use crate::feature::builtin::ticket::TicketHandoff;

    #[derive(Default)]
    struct RecordingTicketService;

    impl TicketService for RecordingTicketService {
-        fn workflow_state(&self, _ticket_id: &str) -> Result<TicketWorkflowState, TicketError> {
-            Ok(TicketWorkflowState::Queued)
+        fn ticket_handoff(&self, ticket_ref: &str) -> Result<TicketHandoff, TicketError> {
+            assert_eq!(ticket_ref, "T-482");
+            Ok(TicketHandoff {
+                id: "00001KZXN51C7".to_string(),
+                resource_key: "T-482".to_string(),
+                workflow_state: TicketWorkflowState::Queued,
+            })
        }
    }

    struct FixedTicketService(TicketWorkflowState);

    impl TicketService for FixedTicketService {
-        fn workflow_state(&self, _ticket_id: &str) -> Result<TicketWorkflowState, TicketError> {
-            Ok(self.0)
+        fn ticket_handoff(&self, _ticket_ref: &str) -> Result<TicketHandoff, TicketError> {
+            Ok(TicketHandoff {
+                id: "00001KZXN51C7".to_string(),
+                resource_key: "T-482".to_string(),
+                workflow_state: self.0,
+            })
        }
    }

@@ -247,7 +258,7 @@ mod tests {
        };
        tool.execute(
            &serde_json::json!({
-                "ticket_id": "00001KZXN51C7",
+                "ticket_id": "T-482",
                "runtime_id": "runtime-1",
                "working_directory_id": "workdir-1"
            })
@@ -265,16 +276,20 @@ mod tests {
            request.operation_id.as_deref(),
            Some("spawn-ticket-coder:00001KZXN51C7:call-7")
        );
-        assert_eq!(request.display_name, "Coder · 00001KZXN51C7");
+        assert_eq!(request.display_name, "Coder · T-482");
        assert_eq!(
            request.initial_submit,
            vec![
                Segment::Flow {
                    selector: CODER_FLOW.to_string()
                },
-                Segment::text("Implement Ticket 00001KZXN51C7.")
+                Segment::text("Implement Ticket T-482.")
            ]
        );
+        assert!(!request.display_name.contains("00001KZXN51C7"));
+        assert!(request.initial_submit.iter().all(|segment| {
+            !Segment::flatten_to_text(std::slice::from_ref(segment)).contains("00001KZXN51C7")
+        }));
    }

    #[tokio::test]
@@ -0,0 +1,792 @@
+use serde::Serialize;
+use serde_json::{Map, Value};
+
+#[derive(Debug, Serialize)]
+pub(super) struct ModelTicketQueryResponse {
+    tickets: Vec<ModelTicketQueryItem>,
+    next_cursor: Option<String>,
+    has_more: bool,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelTicketQueryItem {
+    ticket: String,
+    title: String,
+    state: String,
+    readiness: Option<String>,
+    priority: Option<String>,
+    created_at: Option<String>,
+    updated_at: Option<String>,
+    workspace_action_priority: Option<String>,
+    matched_fields: Vec<String>,
+    snippet: Option<String>,
+    current_coder: Option<ModelWorkerSummary>,
+    linked_objectives: Vec<String>,
+    relation_count: usize,
+    blocker_count: usize,
+    unresolved_blocker_count: usize,
+    unresolved_review_count: usize,
+    evidence: Option<ModelTicketEvidence>,
+    merge_request: Option<ModelMergeRequest>,
+}
+
+#[derive(Debug, Serialize)]
+pub(super) struct ModelTicketDetail {
+    ticket: String,
+    title: String,
+    body: String,
+    state: String,
+    readiness: Option<String>,
+    priority: Option<String>,
+    created_at: Option<String>,
+    updated_at: Option<String>,
+    thread: Vec<ModelTicketEvent>,
+    relations: ModelTicketRelations,
+    linked_objectives: Vec<ModelObjectiveSummary>,
+    assignments: Vec<ModelAssignment>,
+    current_coder: Option<ModelWorkerSummary>,
+    implementation_reports: Vec<ModelEvidenceEvent>,
+    merge_request: Option<ModelMergeRequest>,
+    evidence: Option<ModelTicketEvidence>,
+    actions: Option<ModelTicketActions>,
+    event_page: Option<ModelEventPage>,
+}
+
+#[derive(Debug, Serialize)]
+pub(super) struct ModelObjectiveQueryResponse {
+    objectives: Vec<ModelObjectiveQueryItem>,
+    next_cursor: Option<String>,
+    has_more: bool,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelObjectiveQueryItem {
+    objective: String,
+    title: String,
+    summary: Option<String>,
+    state: String,
+    created_at: Option<String>,
+    updated_at: Option<String>,
+    linked_tickets: Vec<String>,
+    linked_ticket_count: usize,
+}
+
+#[derive(Debug, Serialize)]
+pub(super) struct ModelObjectiveDetail {
+    objective: String,
+    title: String,
+    body: String,
+    state: String,
+    created_at: Option<String>,
+    updated_at: Option<String>,
+    linked_tickets: Vec<ModelTicketSummary>,
+    events: Vec<ModelObjectiveEvent>,
+    event_page: ModelObjectiveEventPage,
+}
+
+impl ModelObjectiveDetail {
+    pub(super) fn objective_ref(&self) -> &str {
+        &self.objective
+    }
+}
+
+#[derive(Debug, Serialize)]
+struct ModelWorkerSummary {
+    worker: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelTicketEvent {
+    sequence: usize,
+    kind: String,
+    body: Option<String>,
+    created_at: Option<String>,
+}
+
+#[derive(Debug, Serialize, Default)]
+struct ModelTicketRelations {
+    outgoing: Vec<ModelRelation>,
+    incoming: Vec<ModelRelation>,
+    blockers: Vec<ModelBlocker>,
+    notices: Vec<ModelNotice>,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelRelation {
+    ticket: String,
+    kind: String,
+    note: Option<String>,
+    created_at: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelBlocker {
+    ticket: String,
+    kind: String,
+    state: Option<String>,
+    resolved: bool,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelNotice {
+    kind: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelObjectiveSummary {
+    objective: String,
+    title: String,
+    state: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelTicketSummary {
+    ticket: String,
+    title: String,
+    state: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelAssignment {
+    role: String,
+    principal: String,
+    assigned_at: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelEvidenceEvent {
+    sequence: usize,
+    kind: String,
+    created_at: Option<String>,
+    excerpt: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelMergeRequest {
+    state: String,
+    selector_from: Option<String>,
+    selector_to: String,
+    review_status: String,
+    subject_ref: Option<String>,
+    review_excerpt: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelTicketEvidence {
+    has_merge_request: bool,
+    has_current_subject_ref: bool,
+    has_review_request: bool,
+    has_commit: bool,
+    review_status: Option<String>,
+    approved_current_subject: bool,
+    unresolved_request_changes: bool,
+    complete_for_integration: bool,
+    missing: Vec<String>,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelTicketActions {
+    can_assign_orchestrator: bool,
+    can_unassign_orchestrator: bool,
+    can_queue: bool,
+    can_start_manual_coder: bool,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelEventPage {
+    next_cursor: Option<String>,
+    has_more: bool,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelObjectiveEvent {
+    kind: String,
+    created_at: String,
+    body: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+struct ModelObjectiveEventPage {
+    next_cursor: Option<String>,
+    has_more: bool,
+}
+
+pub(super) fn project_ticket_query(value: Value) -> Result<ModelTicketQueryResponse, String> {
+    let root = object(&value, "Ticket query response")?;
+    let page = object_field(root, "page")?;
+    let tickets = array_field(root, "items")?
+        .iter()
+        .map(project_ticket_query_item)
+        .collect::<Result<Vec<_>, _>>()?;
+    Ok(ModelTicketQueryResponse {
+        tickets,
+        next_cursor: optional_string(page, "next_cursor")?,
+        has_more: bool_field(page, "has_more")?,
+    })
+}
+
+fn project_ticket_query_item(value: &Value) -> Result<ModelTicketQueryItem, String> {
+    let item = object(value, "Ticket query item")?;
+    Ok(ModelTicketQueryItem {
+        ticket: resource_ref(item, "resource_key", "T-")?,
+        title: string_field(item, "title")?,
+        state: string_field(item, "state")?,
+        readiness: optional_string(item, "readiness")?,
+        priority: optional_string(item, "priority")?,
+        created_at: optional_string(item, "created_at")?,
+        updated_at: optional_string(item, "updated_at")?,
+        workspace_action_priority: optional_string(item, "workspace_action_priority")?,
+        matched_fields: string_array(item, "matched_fields")?,
+        snippet: optional_string(item, "snippet")?,
+        current_coder: item
+            .get("current_coder")
+            .filter(|value| !value.is_null())
+            .map(project_worker)
+            .transpose()?,
+        linked_objectives: string_array(item, "linked_objective_keys")?
+            .into_iter()
+            .map(|key| validate_resource_ref(key, "O-"))
+            .collect::<Result<Vec<_>, _>>()?,
+        relation_count: usize_field(item, "relation_count")?,
+        blocker_count: usize_field(item, "blocker_count")?,
+        unresolved_blocker_count: usize_field(item, "unresolved_blocker_count")?,
+        unresolved_review_count: usize_field(item, "unresolved_review_count")?,
+        evidence: item.get("evidence").map(project_evidence).transpose()?,
+        merge_request: item
+            .get("merge_request")
+            .filter(|value| !value.is_null())
+            .map(project_merge_request)
+            .transpose()?,
+    })
+}
+
+pub(super) fn project_ticket_detail(value: Value) -> Result<ModelTicketDetail, String> {
+    let root = object(&value, "Ticket detail response")?;
+    let current_coder = root
+        .get("current_coder")
+        .filter(|value| !value.is_null())
+        .map(project_worker)
+        .transpose()?;
+    let assignments = array_field(root, "assignments")?
+        .iter()
+        .map(|assignment| project_assignment(assignment, current_coder.as_ref()))
+        .collect::<Result<Vec<_>, _>>()?;
+
+    Ok(ModelTicketDetail {
+        ticket: resource_ref(root, "resource_key", "T-")?,
+        title: string_field(root, "title")?,
+        body: string_field(root, "body")?,
+        state: string_field(root, "state")?,
+        readiness: optional_string(root, "readiness")?,
+        priority: optional_string(root, "priority")?,
+        created_at: optional_string(root, "created_at")?,
+        updated_at: optional_string(root, "updated_at")?,
+        thread: array_field(root, "events")?
+            .iter()
+            .map(project_ticket_event)
+            .collect::<Result<Vec<_>, _>>()?,
+        relations: project_relations(root.get("relations"))?,
+        linked_objectives: array_field(root, "linked_objectives")?
+            .iter()
+            .map(project_objective_summary)
+            .collect::<Result<Vec<_>, _>>()?,
+        assignments,
+        current_coder,
+        implementation_reports: array_field(root, "implementation_reports")?
+            .iter()
+            .map(project_evidence_event)
+            .collect::<Result<Vec<_>, _>>()?,
+        merge_request: root
+            .get("merge_request")
+            .filter(|value| !value.is_null())
+            .map(project_merge_request)
+            .transpose()?,
+        evidence: root.get("evidence").map(project_evidence).transpose()?,
+        actions: root
+            .get("action_eligibility")
+            .filter(|value| !value.is_null())
+            .map(project_actions)
+            .transpose()?,
+        event_page: root
+            .get("event_page")
+            .filter(|value| !value.is_null())
+            .map(project_event_page)
+            .transpose()?,
+    })
+}
+
+pub(super) fn project_objective_query(value: Value) -> Result<ModelObjectiveQueryResponse, String> {
+    let root = object(&value, "Objective query response")?;
+    let page = object_field(root, "page")?;
+    Ok(ModelObjectiveQueryResponse {
+        objectives: array_field(root, "items")?
+            .iter()
+            .map(project_objective_query_item)
+            .collect::<Result<Vec<_>, _>>()?,
+        next_cursor: optional_string(page, "next_cursor")?,
+        has_more: bool_field(page, "has_more")?,
+    })
+}
+
+fn project_objective_query_item(value: &Value) -> Result<ModelObjectiveQueryItem, String> {
+    let item = object(value, "Objective query item")?;
+    let linked_tickets = string_array(item, "linked_ticket_keys")?
+        .into_iter()
+        .map(|key| validate_resource_ref(key, "T-"))
+        .collect::<Result<Vec<_>, _>>()?;
+    Ok(ModelObjectiveQueryItem {
+        objective: resource_ref(item, "resource_key", "O-")?,
+        title: string_field(item, "title")?,
+        summary: optional_string(item, "snippet")?,
+        state: string_field(item, "state")?,
+        created_at: optional_string(item, "created_at")?,
+        updated_at: optional_string(item, "updated_at")?,
+        linked_ticket_count: linked_tickets.len(),
+        linked_tickets,
+    })
+}
+
+pub(super) fn project_objective_detail(value: Value) -> Result<ModelObjectiveDetail, String> {
+    let root = object(&value, "Objective detail response")?;
+    Ok(ModelObjectiveDetail {
+        objective: resource_ref(root, "resource_key", "O-")?,
+        title: string_field(root, "title")?,
+        body: string_field(root, "body")?,
+        state: string_field(root, "state")?,
+        created_at: optional_string(root, "created_at")?,
+        updated_at: optional_string(root, "updated_at")?,
+        linked_tickets: array_field(root, "linked_ticket_summaries")?
+            .iter()
+            .map(project_ticket_summary)
+            .collect::<Result<Vec<_>, _>>()?,
+        events: array_field(root, "events")?
+            .iter()
+            .map(project_objective_event)
+            .collect::<Result<Vec<_>, _>>()?,
+        event_page: project_objective_event_page(
+            root.get("event_page")
+                .ok_or_else(|| "Objective detail response is missing event_page".to_string())?,
+        )?,
+    })
+}
+
+fn project_worker(value: &Value) -> Result<ModelWorkerSummary, String> {
+    let worker = object(value, "Worker summary")?;
+    Ok(ModelWorkerSummary {
+        worker: resource_ref(worker, "worker_resource_key", "W-")?,
+    })
+}
+
+fn project_ticket_event(value: &Value) -> Result<ModelTicketEvent, String> {
+    let event = object(value, "Ticket event")?;
+    Ok(ModelTicketEvent {
+        sequence: usize_field(event, "sequence")?,
+        kind: string_field(event, "kind")?,
+        body: match event.get("body") {
+            None | Some(Value::Null) => None,
+            Some(Value::String(body)) => Some(body.clone()),
+            Some(_) => return Err("invalid Ticket event body".to_string()),
+        },
+        created_at: optional_string(event, "at")?,
+    })
+}
+
+fn project_relations(value: Option<&Value>) -> Result<ModelTicketRelations, String> {
+    let Some(value) = value else {
+        return Ok(ModelTicketRelations::default());
+    };
+    let relations = object(value, "Ticket relations")?;
+    Ok(ModelTicketRelations {
+        outgoing: array_field(relations, "outgoing")?
+            .iter()
+            .map(|value| project_relation(value, "target_resource_key", "kind"))
+            .collect::<Result<Vec<_>, _>>()?,
+        incoming: array_field(relations, "incoming")?
+            .iter()
+            .map(|value| project_relation(value, "source_resource_key", "forward_kind"))
+            .collect::<Result<Vec<_>, _>>()?,
+        blockers: array_field(relations, "blockers")?
+            .iter()
+            .map(project_blocker)
+            .collect::<Result<Vec<_>, _>>()?,
+        notices: array_field(relations, "notices")?
+            .iter()
+            .map(project_notice)
+            .collect::<Result<Vec<_>, _>>()?,
+    })
+}
+
+fn project_relation(
+    value: &Value,
+    ticket_key: &str,
+    kind_key: &str,
+) -> Result<ModelRelation, String> {
+    let relation = object(value, "Ticket relation")?;
+    let relation_data = relation.get("relation").and_then(Value::as_object);
+    let kind = if kind_key == "kind" {
+        relation_data
+            .ok_or_else(|| "Ticket relation is missing relation data".to_string())
+            .and_then(|data| string_field(data, "kind"))?
+    } else {
+        string_field(relation, kind_key)?
+    };
+    let note = match relation_data {
+        Some(data) => optional_string(data, "note")?,
+        None => optional_string(relation, "note")?,
+    };
+    let created_at = match relation_data {
+        Some(data) => optional_string(data, "at")?,
+        None => optional_string(relation, "at")?,
+    };
+    Ok(ModelRelation {
+        ticket: resource_ref(relation, ticket_key, "T-")?,
+        kind,
+        note,
+        created_at,
+    })
+}
+
+fn project_blocker(value: &Value) -> Result<ModelBlocker, String> {
+    let blocker = object(value, "Ticket blocker")?;
+    Ok(ModelBlocker {
+        ticket: resource_ref(blocker, "blocking_resource_key", "T-")?,
+        kind: string_field(blocker, "relation_kind")?,
+        state: optional_string(blocker, "blocking_state")?,
+        resolved: bool_field(blocker, "resolved")?,
+    })
+}
+
+fn project_notice(value: &Value) -> Result<ModelNotice, String> {
+    let notice = object(value, "Ticket notice")?;
+    Ok(ModelNotice {
+        kind: string_field(notice, "kind")?,
+    })
+}
+
+fn project_objective_summary(value: &Value) -> Result<ModelObjectiveSummary, String> {
+    let summary = object(value, "Objective summary")?;
+    Ok(ModelObjectiveSummary {
+        objective: resource_ref(summary, "resource_key", "O-")?,
+        title: string_field(summary, "title")?,
+        state: string_field(summary, "state")?,
+    })
+}
+
+fn project_ticket_summary(value: &Value) -> Result<ModelTicketSummary, String> {
+    let summary = object(value, "Ticket summary")?;
+    Ok(ModelTicketSummary {
+        ticket: resource_ref(summary, "resource_key", "T-")?,
+        title: string_field(summary, "title")?,
+        state: string_field(summary, "state")?,
+    })
+}
+
+fn project_assignment(
+    value: &Value,
+    current_coder: Option<&ModelWorkerSummary>,
+) -> Result<ModelAssignment, String> {
+    let assignment = object(value, "Ticket assignment")?;
+    let principal = object_field(assignment, "principal")?;
+    let kind = string_field(principal, "kind")?;
+    let principal = match kind.as_str() {
+        "worker" => current_coder
+            .map(|coder| coder.worker.clone())
+            .ok_or_else(|| "Worker assignment is missing a Workspace key projection".to_string())?,
+        "workspace_agent" => format!("workspace-agent:{}", string_field(principal, "agent_key")?),
+        "user" => "user".to_string(),
+        other => format!("source:{other}"),
+    };
+    Ok(ModelAssignment {
+        role: string_field(assignment, "role")?,
+        principal,
+        assigned_at: string_field(assignment, "assigned_at")?,
+    })
+}
+
+fn project_evidence_event(value: &Value) -> Result<ModelEvidenceEvent, String> {
+    let event = object(value, "Ticket evidence event")?;
+    Ok(ModelEvidenceEvent {
+        sequence: usize_field(event, "sequence")?,
+        kind: string_field(event, "kind")?,
+        created_at: optional_string(event, "at")?,
+        excerpt: string_field(event, "excerpt")?,
+    })
+}
+
+fn project_merge_request(value: &Value) -> Result<ModelMergeRequest, String> {
+    let merge = object(value, "Merge Request summary")?;
+    Ok(ModelMergeRequest {
+        state: string_field(merge, "state")?,
+        selector_from: optional_string(merge, "selector_from")?,
+        selector_to: string_field(merge, "selector_to")?,
+        review_status: string_field(merge, "review_status")?,
+        subject_ref: optional_string(merge, "subject_ref")?,
+        review_excerpt: optional_string(merge, "review_excerpt")?,
+    })
+}
+
+fn project_evidence(value: &Value) -> Result<ModelTicketEvidence, String> {
+    let evidence = object(value, "Ticket evidence")?;
+    Ok(ModelTicketEvidence {
+        has_merge_request: bool_field(evidence, "has_merge_request")?,
+        has_current_subject_ref: bool_field(evidence, "has_current_subject_ref")?,
+        has_review_request: bool_field(evidence, "has_review_request")?,
+        has_commit: bool_field(evidence, "has_commit")?,
+        review_status: optional_string(evidence, "review_status")?,
+        approved_current_subject: bool_field(evidence, "approved_current_subject")?,
+        unresolved_request_changes: bool_field(evidence, "unresolved_request_changes")?,
+        complete_for_integration: bool_field(evidence, "complete_for_integration")?,
+        missing: string_array(evidence, "missing")?,
+    })
+}
+
+fn project_actions(value: &Value) -> Result<ModelTicketActions, String> {
+    let actions = object(value, "Ticket actions")?;
+    Ok(ModelTicketActions {
+        can_assign_orchestrator: bool_field(actions, "can_assign_orchestrator")?,
+        can_unassign_orchestrator: bool_field(actions, "can_unassign_orchestrator")?,
+        can_queue: bool_field(actions, "can_queue")?,
+        can_start_manual_coder: bool_field(actions, "can_start_manual_coder")?,
+    })
+}
+
+fn project_event_page(value: &Value) -> Result<ModelEventPage, String> {
+    let page = object(value, "Ticket event page")?;
+    Ok(ModelEventPage {
+        next_cursor: optional_string(page, "next_cursor")?,
+        has_more: bool_field(page, "has_more")?,
+    })
+}
+
+fn project_objective_event(value: &Value) -> Result<ModelObjectiveEvent, String> {
+    let event = object(value, "Objective event")?;
+    let body = optional_string(event, "body")?;
+    Ok(ModelObjectiveEvent {
+        kind: string_field(event, "kind")?,
+        created_at: string_field(event, "created_at")?,
+        body,
+    })
+}
+
+fn project_objective_event_page(value: &Value) -> Result<ModelObjectiveEventPage, String> {
+    let page = object(value, "Objective event page")?;
+    Ok(ModelObjectiveEventPage {
+        next_cursor: optional_string(page, "next_cursor")?,
+        has_more: bool_field(page, "has_more")?,
+    })
+}
+
+fn object<'a>(value: &'a Value, context: &str) -> Result<&'a Map<String, Value>, String> {
+    value
+        .as_object()
+        .ok_or_else(|| format!("{context} must be an object"))
+}
+
+fn object_field<'a>(
+    object: &'a Map<String, Value>,
+    key: &str,
+) -> Result<&'a Map<String, Value>, String> {
+    object
+        .get(key)
+        .and_then(Value::as_object)
+        .ok_or_else(|| format!("missing or invalid {key}"))
+}
+
+fn array_field<'a>(object: &'a Map<String, Value>, key: &str) -> Result<&'a [Value], String> {
+    object
+        .get(key)
+        .and_then(Value::as_array)
+        .map(Vec::as_slice)
+        .ok_or_else(|| format!("missing or invalid {key}"))
+}
+
+fn string_field(object: &Map<String, Value>, key: &str) -> Result<String, String> {
+    object
+        .get(key)
+        .and_then(Value::as_str)
+        .map(ToOwned::to_owned)
+        .ok_or_else(|| format!("missing or invalid {key}"))
+}
+
+fn optional_string(object: &Map<String, Value>, key: &str) -> Result<Option<String>, String> {
+    match object.get(key) {
+        None | Some(Value::Null) => Ok(None),
+        Some(Value::String(value)) => Ok(Some(value.clone())),
+        Some(_) => Err(format!("invalid {key}")),
+    }
+}
+
+fn bool_field(object: &Map<String, Value>, key: &str) -> Result<bool, String> {
+    object
+        .get(key)
+        .and_then(Value::as_bool)
+        .ok_or_else(|| format!("missing or invalid {key}"))
+}
+
+fn usize_field(object: &Map<String, Value>, key: &str) -> Result<usize, String> {
+    object
+        .get(key)
+        .and_then(Value::as_u64)
+        .and_then(|value| usize::try_from(value).ok())
+        .ok_or_else(|| format!("missing or invalid {key}"))
+}
+
+fn string_array(object: &Map<String, Value>, key: &str) -> Result<Vec<String>, String> {
+    array_field(object, key)?
+        .iter()
+        .map(|value| {
+            value
+                .as_str()
+                .map(ToOwned::to_owned)
+                .ok_or_else(|| format!("invalid {key}"))
+        })
+        .collect()
+}
+
+fn resource_ref(object: &Map<String, Value>, key: &str, prefix: &str) -> Result<String, String> {
+    let value = object
+        .get(key)
+        .and_then(Value::as_str)
+        .map(ToOwned::to_owned)
+        .ok_or_else(|| format!("required {prefix} key is unavailable"))?;
+    validate_resource_ref(value, prefix)
+}
+
+fn validate_resource_ref(value: String, prefix: &str) -> Result<String, String> {
+    let valid = value.strip_prefix(prefix).is_some_and(|sequence| {
+        !sequence.is_empty() && sequence.bytes().all(|byte| byte.is_ascii_digit())
+    });
+    if valid {
+        Ok(value)
+    } else {
+        Err(format!("required {prefix} key is unavailable"))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    #[test]
+    fn objective_projection_exposes_only_resource_references() {
+        let projected = project_objective_detail(json!({
+            "id": "00001M10HW6BV",
+            "resource_key": "O-543",
+            "title": "Objective",
+            "body": "Body",
+            "state": "active",
+            "created_at": "2026-01-01T00:00:00Z",
+            "updated_at": "2026-01-02T00:00:00Z",
+            "linked_tickets": ["00001M0E82D1V"],
+            "linked_ticket_summaries": [{
+                "id": "00001M0E82D1V",
+                "resource_key": "T-496",
+                "title": "Ticket",
+                "state": "done",
+                "updated_at": "2026-01-02T00:00:00Z"
+            }],
+            "events": [{
+                "sequence": 3,
+                "event_ref": "objective-event-3",
+                "kind": "linked_ticket",
+                "created_at": "2026-01-02T00:00:00Z",
+                "body": "linked"
+            }],
+            "event_page": {"next_cursor": null, "has_more": false, "window_start_sequence": 3, "window_end_sequence": 3}
+        })).expect("projection");
+        let json = serde_json::to_value(projected).expect("serialize");
+        let text = json.to_string();
+        assert!(text.contains("O-543"));
+        assert!(text.contains("T-496"));
+        assert!(!text.contains("00001M10HW6BV"));
+        assert!(!text.contains("00001M0E82D1V"));
+        assert!(!text.contains("event_ref"));
+    }
+
+    #[test]
+    fn query_projections_accept_workspace_api_shapes_and_scrub_internal_ids() {
+        let ticket = project_ticket_query(json!({
+            "page": {"next_cursor": null, "has_more": false},
+            "record_authority": "workspace_sqlite",
+            "items": [{
+                "id": "00001TICKETINTERNAL",
+                "resource_key": "T-543",
+                "title": "Ticket",
+                "state": "inprogress",
+                "readiness": null,
+                "priority": "high",
+                "created_at": null,
+                "updated_at": "2026-01-01T00:00:00Z",
+                "workspace_action_priority": "active_work",
+                "matched_fields": ["title"],
+                "snippet": "Ticket",
+                "current_coder": {"runtime_id": "runtime-internal", "worker_id": "worker-internal", "worker_resource_key": "W-12"},
+                "linked_objective_ids": ["00001OBJECTIVEINTERNAL"],
+                "linked_objective_keys": ["O-6"],
+                "relation_count": 0,
+                "blocker_count": 0,
+                "unresolved_blocker_count": 0,
+                "unresolved_review_count": 0,
+                "evidence": {
+                    "has_merge_request": false,
+                    "has_current_subject_ref": false,
+                    "has_review_request": false,
+                    "has_commit": false,
+                    "review_status": null,
+                    "approved_current_subject": false,
+                    "unresolved_request_changes": false,
+                    "complete_for_integration": false,
+                    "missing": ["merge_request"]
+                },
+                "merge_request": null
+            }]
+        })).expect("Ticket query projection");
+        let ticket_json = serde_json::to_string(&ticket).expect("serialize Ticket query");
+        assert!(ticket_json.contains("T-543"));
+        assert!(ticket_json.contains("O-6"));
+        assert!(ticket_json.contains("W-12"));
+        assert!(!ticket_json.contains("00001TICKETINTERNAL"));
+        assert!(!ticket_json.contains("runtime-internal"));
+        assert!(!ticket_json.contains("worker-internal"));
+
+        let objective = project_objective_query(json!({
+            "page": {"next_cursor": null, "has_more": false},
+            "record_authority": "workspace_sqlite",
+            "items": [{
+                "id": "00001OBJECTIVEINTERNAL",
+                "resource_key": "O-6",
+                "title": "Objective",
+                "state": "active",
+                "created_at": null,
+                "updated_at": null,
+                "matched_fields": [],
+                "snippet": null,
+                "linked_ticket_count": 1,
+                "linked_tickets": ["00001TICKETINTERNAL"],
+                "linked_ticket_keys": ["T-543"]
+            }]
+        }))
+        .expect("Objective query projection");
+        let objective_json = serde_json::to_string(&objective).expect("serialize Objective query");
+        assert!(objective_json.contains("O-6"));
+        assert!(objective_json.contains("T-543"));
+        assert!(objective_json.contains("\"summary\":null"));
+        assert!(!objective_json.contains("00001OBJECTIVEINTERNAL"));
+        assert!(!objective_json.contains("00001TICKETINTERNAL"));
+    }
+
+    #[test]
+    fn resource_projection_rejects_noncanonical_keys() {
+        for (key, prefix) in [("T-key", "T-"), ("O-", "O-"), ("W-1x", "W-")] {
+            assert!(validate_resource_ref(key.to_string(), prefix).is_err());
+        }
+    }
+
+    #[test]
+    fn ticket_projection_fails_closed_without_worker_resource_key() {
+        let error = project_worker(&json!({"worker_resource_key": null}))
+            .expect_err("missing W-key must fail");
+        assert!(error.contains("W-"));
+    }
+}
@@ -193,6 +193,7 @@ impl Tool for ShowOverviewTool {
            .map(|entry| {
                serde_json::json!({
                    "entry_ref": entry.id,
+                    "origin": entry.origin,
                    "entry_range": entry.entry_range,
                    "kind": entry.kind.as_str(),
                    "label": entry.label,
@@ -234,15 +235,16 @@ impl Tool for SearchEntriesTool {
            .transpose()?;
        let from = params.from.as_deref().map(parse_entry_ref).transpose()?;
        let through = params.through.as_deref().map(parse_entry_ref).transpose()?;
+        let view = self.state.view();
        if let (Some(from), Some(through)) = (&from, &through) {
-            if from.source_index() > through.source_index() {
+            if view.source_index_for_ref(from) > view.source_index_for_ref(through) {
                return Err(ToolError::InvalidArgument(
                    "SearchEntries from must not be after through".to_string(),
                ));
            }
        }
        let limit = bounded_limit(params.limit, DEFAULT_PAGE_LIMIT, MAX_PAGE_LIMIT);
-        let hits = self.state.view().search(&SearchOptions {
+        let hits = view.search(&SearchOptions {
            query: params.query,
            kind,
            tool_part,
@@ -318,6 +320,7 @@ impl Tool for ReadEntryTool {
            .map(|entry| {
                serde_json::json!({
                    "entry_ref": entry.id,
+                    "origin": entry.origin,
                    "entry_range": entry.entry_range,
                    "kind": entry.kind.as_str(),
                    "tool_part": entry.tool_part.map(|part| format!("{part:?}").to_lowercase()),
@@ -33,6 +33,8 @@ use crate::feature::{
 use crate::worker::{WorkspaceClient, WorkspaceRequest, WorkspaceRequestMethod};
 use agen::tool::{Tool, ToolError, ToolExecutionContext, ToolMeta, ToolOutput};

+use super::resource_projection::{project_ticket_detail, project_ticket_query};
+
 #[derive(Clone, Copy)]
 enum WorkspaceTicketReadKind {
    Query,
@@ -153,8 +155,10 @@ struct WorkspaceQueryTicketInput {
    /// stale_after_rescope, and missing_evidence.
    #[serde(default)]
    attention: Vec<WorkspaceTicketAttentionFilter>,
+    /// Related Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    related_ticket_id: Option<String>,
    relation_kind: Option<WorkspaceTicketRelationFilter>,
+    /// Linked Objective reference. Prefer `O-*`; canonical internal ids remain accepted for compatibility.
    linked_objective_id: Option<String>,
    updated_after: Option<String>,
    updated_before: Option<String>,
@@ -169,6 +173,7 @@ struct WorkspaceQueryTicketInput {

 #[derive(Debug, Deserialize, Serialize, JsonSchema)]
 struct WorkspaceShowTicketInput {
+    /// Ticket reference. Prefer `T-*`; canonical internal ids remain accepted for compatibility.
    id: String,
    /// Most-recent thread entries to return, bounded by the Backend to 1..=50.
    event_limit: Option<usize>,
@@ -229,13 +234,27 @@ impl Tool for WorkspaceTicketReadTool {
            .map_err(|error| ToolError::ExecutionFailed(error.to_string()))?;
        if !response.is_success() {
            return Err(ToolError::ExecutionFailed(format!(
-                "Workspace Ticket API returned HTTP {}: {}",
-                response.status, response.body
+                "Workspace Ticket API request failed with HTTP status {}",
+                response.status
            )));
        }
+        let response_value: Value = serde_json::from_str(&response.body).map_err(|error| {
+            ToolError::ExecutionFailed(format!(
+                "Workspace Ticket API returned invalid JSON: {error}"
+            ))
+        })?;
+        let content = match self.kind {
+            WorkspaceTicketReadKind::Query => serde_json::to_string(
+                &project_ticket_query(response_value).map_err(ToolError::ExecutionFailed)?,
+            ),
+            WorkspaceTicketReadKind::Show => serde_json::to_string(
+                &project_ticket_detail(response_value).map_err(ToolError::ExecutionFailed)?,
+            ),
+        }
+        .map_err(|error| ToolError::Internal(error.to_string()))?;
        Ok(ToolOutput {
            summary: self.kind.name().to_string(),
-            content: Some(response.body),
+            content: Some(content),
            attachments: Vec::new(),
        })
    }
@@ -267,18 +286,52 @@ pub const TICKET_SERVICE_ID: &str = "ticket.authority";
 const TICKET_SERVICE_VERSION: &str = "1";

 pub trait TicketService: Send + Sync {
-    fn workflow_state(&self, ticket_id: &str) -> Result<TicketWorkflowState, TicketError>;
+    fn ticket_handoff(&self, ticket_ref: &str) -> Result<TicketHandoff, TicketError>;
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct TicketHandoff {
+    pub id: String,
+    pub resource_key: String,
+    pub workflow_state: TicketWorkflowState,
+}
+
+fn is_canonical_ticket_resource_key(resource_key: &str) -> bool {
+    resource_key.strip_prefix("T-").is_some_and(|sequence| {
+        !sequence.is_empty() && sequence.bytes().all(|byte| byte.is_ascii_digit())
+    })
 }

 struct BackendTicketService {
    backend: TicketToolBackend,
 }

+struct WorkspaceTicketService {
+    backend: WorkspaceHttpTicketBackend,
+}
+
+fn ticket_handoff_from_record(ticket: Ticket) -> Result<TicketHandoff, TicketError> {
+    let resource_key = ticket
+        .meta
+        .resource_key
+        .filter(|key| is_canonical_ticket_resource_key(key))
+        .ok_or_else(|| TicketError::Conflict("ticket resource key is unavailable".into()))?;
+    Ok(TicketHandoff {
+        id: ticket.meta.id,
+        resource_key,
+        workflow_state: ticket.meta.workflow_state,
+    })
+}
+
 impl TicketService for BackendTicketService {
-    fn workflow_state(&self, ticket_id: &str) -> Result<TicketWorkflowState, TicketError> {
-        self.backend
-            .show(ticket_id.into())
-            .map(|ticket| ticket.meta.workflow_state)
+    fn ticket_handoff(&self, ticket_ref: &str) -> Result<TicketHandoff, TicketError> {
+        ticket_handoff_from_record(self.backend.show(ticket_ref.into())?)
+    }
+}
+
+impl TicketService for WorkspaceTicketService {
+    fn ticket_handoff(&self, ticket_ref: &str) -> Result<TicketHandoff, TicketError> {
+        ticket_handoff_from_record(self.backend.show_unprojected(ticket_ref)?)
    }
 }

@@ -600,9 +653,14 @@ impl FeatureModule for TicketFeature {
        let Some(backend) = self.tool_backend(context) else {
            return Ok(());
        };
-        let ticket_service: Arc<dyn TicketService> = Arc::new(BackendTicketService {
-            backend: backend.clone(),
-        });
+        let ticket_service: Arc<dyn TicketService> = match &self.backend {
+            TicketFeatureBackend::WorkspaceClient(client) => Arc::new(WorkspaceTicketService {
+                backend: WorkspaceHttpTicketBackend::new(client.clone()),
+            }),
+            TicketFeatureBackend::Local { .. } => Arc::new(BackendTicketService {
+                backend: backend.clone(),
+            }),
+        };
        context.services().provide(
            ServiceDeclaration::new(
                ServiceId::builtin(TICKET_SERVICE_ID),
@@ -674,6 +732,26 @@ impl WorkspaceHttpTicketBackend {
        Self::invoke_client(client, workspace_id, operation)
    }

+    fn show_unprojected(&self, ticket_ref: &str) -> TicketResult<Ticket> {
+        let client = self.client.clone();
+        let workspace_id = self.client.workspace_id().unwrap_or_default().to_string();
+        let ticket_path = Self::ticket_path(&TicketIdOrSlug::from(ticket_ref));
+        let request = move || {
+            Self::request_unprojected(
+                client,
+                WorkspaceRequestMethod::Get,
+                format!("/api/w/{workspace_id}/tickets/{ticket_path}/record"),
+                None,
+            )
+        };
+        if tokio::runtime::Handle::try_current().is_ok() {
+            return std::thread::spawn(request).join().map_err(|_| {
+                TicketError::Conflict("ticket REST request thread panicked".to_string())
+            })?;
+        }
+        request()
+    }
+
    fn ticket_path(id: &TicketIdOrSlug) -> String {
        let value = match id {
            TicketIdOrSlug::Id(value)
@@ -698,6 +776,29 @@ impl WorkspaceHttpTicketBackend {
        endpoint: String,
        body: Option<serde_json::Value>,
    ) -> TicketResult<T> {
+        let mut value = Self::request_value(client, method, endpoint, body)?;
+        Self::canonicalize_ticket_references(&mut value);
+        serde_json::from_value(value)
+            .map_err(|error| TicketError::Conflict(format!("decode ticket REST response: {error}")))
+    }
+
+    fn request_unprojected<T: serde::de::DeserializeOwned>(
+        client: Arc<dyn WorkspaceClient>,
+        method: WorkspaceRequestMethod,
+        endpoint: String,
+        body: Option<serde_json::Value>,
+    ) -> TicketResult<T> {
+        let value = Self::request_value(client, method, endpoint, body)?;
+        serde_json::from_value(value)
+            .map_err(|error| TicketError::Conflict(format!("decode ticket REST response: {error}")))
+    }
+
+    fn request_value(
+        client: Arc<dyn WorkspaceClient>,
+        method: WorkspaceRequestMethod,
+        endpoint: String,
+        body: Option<serde_json::Value>,
+    ) -> TicketResult<Value> {
        let request = match body {
            Some(body) => WorkspaceRequest::json(method, endpoint, body.to_string()),
            None if method == WorkspaceRequestMethod::Get => WorkspaceRequest::get(endpoint),
@@ -712,14 +813,63 @@ impl WorkspaceHttpTicketBackend {
        })?;
        if !response.is_success() {
            return Err(TicketError::Conflict(format!(
-                "ticket REST API returned HTTP {}: {}",
-                response.status, response.body
+                "ticket REST API request failed with HTTP status {}",
+                response.status
            )));
        }
        serde_json::from_str(&response.body)
            .map_err(|error| TicketError::Conflict(format!("decode ticket REST response: {error}")))
    }

+    fn canonicalize_ticket_references(value: &mut Value) {
+        match value {
+            Value::Array(values) => {
+                for value in values {
+                    Self::canonicalize_ticket_references(value);
+                }
+            }
+            Value::Object(object) => {
+                for value in object.values_mut() {
+                    Self::canonicalize_ticket_references(value);
+                }
+                if let Some(resource_key) = object
+                    .get("resource_key")
+                    .and_then(Value::as_str)
+                    .filter(|key| is_canonical_ticket_resource_key(key))
+                    .map(ToOwned::to_owned)
+                    && object.contains_key("id")
+                {
+                    object.insert("id".to_string(), Value::String(resource_key));
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn resolve_ticket_resource_key(
+        client: Arc<dyn WorkspaceClient>,
+        base: &str,
+        reference: &TicketIdOrSlug,
+    ) -> TicketResult<String> {
+        let response: Value = Self::request(
+            client,
+            WorkspaceRequestMethod::Get,
+            format!("{base}/{}", Self::ticket_path(reference)),
+            None,
+        )?;
+        response
+            .get("resource_key")
+            .or_else(|| {
+                response
+                    .get("meta")
+                    .and_then(|meta| meta.get("resource_key"))
+            })
+            .and_then(Value::as_str)
+            .filter(|key| is_canonical_ticket_resource_key(key))
+            .map(ToOwned::to_owned)
+            .ok_or_else(|| TicketError::Conflict("required Ticket key is unavailable".to_string()))
+    }
+
    fn request_unit(
        client: Arc<dyn WorkspaceClient>,
        method: WorkspaceRequestMethod,
@@ -739,8 +889,8 @@ impl WorkspaceHttpTicketBackend {
        })?;
        if !response.is_success() {
            return Err(TicketError::Conflict(format!(
-                "ticket REST API returned HTTP {}: {}",
-                response.status, response.body
+                "ticket REST API request failed with HTTP status {}",
+                response.status
            )));
        }
        Ok(TicketBackendOperationResult::Unit)
@@ -781,12 +931,22 @@ impl WorkspaceHttpTicketBackend {
                Ok(TicketBackendOperationResult::Tickets(tickets))
            }
            TicketBackendOperation::Show { id } => {
-                let ticket = Self::request(
+                let ticket: Ticket = Self::request(
                    client,
                    WorkspaceRequestMethod::Get,
                    format!("{base}/{}/record", Self::ticket_path(&id)),
                    None,
                )?;
+                if !ticket
+                    .meta
+                    .resource_key
+                    .as_deref()
+                    .is_some_and(is_canonical_ticket_resource_key)
+                {
+                    return Err(TicketError::Conflict(
+                        "required Ticket key is unavailable".to_string(),
+                    ));
+                }
                Ok(TicketBackendOperationResult::Ticket(ticket))
            }
            TicketBackendOperation::Create { input } => {
@@ -889,7 +1049,14 @@ impl WorkspaceHttpTicketBackend {
                })?),
            ),
            TicketBackendOperation::AddTicketRelation { id, relation } => {
-                let relation = Self::request(
+                let source_resource_key =
+                    Self::resolve_ticket_resource_key(client.clone(), &base, &id)?;
+                let target_resource_key = Self::resolve_ticket_resource_key(
+                    client.clone(),
+                    &base,
+                    &TicketIdOrSlug::Id(relation.target.clone()),
+                )?;
+                let mut relation: TicketRelation = Self::request(
                    client,
                    WorkspaceRequestMethod::Post,
                    format!("{base}/{}/relations", Self::ticket_path(&id)),
@@ -897,20 +1064,30 @@ impl WorkspaceHttpTicketBackend {
                        TicketError::Conflict(format!("serialize Ticket relation: {error}"))
                    })?),
                )?;
+                relation.ticket_id = source_resource_key;
+                relation.target = target_resource_key;
+                relation.author = "workspace".to_string();
                Ok(TicketBackendOperationResult::Relation(relation))
            }
            TicketBackendOperation::RemoveTicketRelation { id, kind, target } => {
+                let source_resource_key =
+                    Self::resolve_ticket_resource_key(client.clone(), &base, &id)?;
+                let target_resource_key =
+                    Self::resolve_ticket_resource_key(client.clone(), &base, &target)?;
                let target = match target {
                    TicketIdOrSlug::Id(value)
                    | TicketIdOrSlug::Slug(value)
                    | TicketIdOrSlug::Query(value) => value,
                };
-                let relation = Self::request(
+                let mut relation: TicketRelation = Self::request(
                    client,
                    WorkspaceRequestMethod::Delete,
                    format!("{base}/{}/relations", Self::ticket_path(&id)),
                    Some(serde_json::json!({ "kind": kind, "target": target })),
                )?;
+                relation.ticket_id = source_resource_key;
+                relation.target = target_resource_key;
+                relation.author = "workspace".to_string();
                Ok(TicketBackendOperationResult::Relation(relation))
            }
            TicketBackendOperation::QueryTicketRelations { ticket, kind } => {
@@ -1245,6 +1422,23 @@ mod tests {
            .expect("tool exists")
    }

+    #[test]
+    fn workspace_ticket_backend_canonicalizes_model_facing_ticket_ids() {
+        let mut value = serde_json::json!({
+            "id": "00001INTERNAL",
+            "resource_key": "T-42",
+            "nested": {
+                "id": "00002INTERNAL",
+                "resource_key": "T-43"
+            },
+            "body": "user-authored 00003BODY stays unchanged"
+        });
+        WorkspaceHttpTicketBackend::canonicalize_ticket_references(&mut value);
+        assert_eq!(value["id"], "T-42");
+        assert_eq!(value["nested"]["id"], "T-43");
+        assert_eq!(value["body"], "user-authored 00003BODY stays unchanged");
+    }
+
    #[test]
    fn workspace_ticket_reads_expose_bounded_query_and_show_contracts_without_legacy_aliases() {
        let client: Arc<dyn WorkspaceClient> = Arc::new(
@@ -1721,11 +1915,102 @@ provider = "github"
        server.join().unwrap();
    }

+    #[test]
+    fn workspace_http_backend_records_relation_with_authoritative_keys() {
+        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+        let addr = listener.local_addr().unwrap();
+        let server = thread::spawn(move || {
+            for (expected_path, resource_key) in [
+                ("GET /api/w/workspace-a/tickets/01SOURCE HTTP/1.1", "T-1"),
+                ("GET /api/w/workspace-a/tickets/01TARGET HTTP/1.1", "T-2"),
+            ] {
+                let (mut stream, _) = listener.accept().unwrap();
+                let mut buffer = [0_u8; 8192];
+                let len = stream.read(&mut buffer).unwrap();
+                let request = String::from_utf8_lossy(&buffer[..len]);
+                assert!(request.starts_with(expected_path));
+                let body = serde_json::json!({"meta": {"resource_key": resource_key}}).to_string();
+                write!(
+                    stream,
+                    "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                    body.len(), body
+                )
+                .unwrap();
+            }
+
+            let (mut stream, _) = listener.accept().unwrap();
+            let mut buffer = [0_u8; 8192];
+            let len = stream.read(&mut buffer).unwrap();
+            let request = String::from_utf8_lossy(&buffer[..len]);
+            assert!(
+                request.starts_with("POST /api/w/workspace-a/tickets/01SOURCE/relations HTTP/1.1")
+            );
+            let body = serde_json::to_string(&TicketRelation {
+                ticket_id: "01SOURCE".to_string(),
+                kind: TicketRelationKind::DependsOn,
+                target: "01TARGET".to_string(),
+                note: None,
+                author: "worker-internal".to_string(),
+                at: "2026-08-06T00:00:00Z".to_string(),
+            })
+            .unwrap();
+            write!(
+                stream,
+                "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                body.len(),
+                body
+            )
+            .unwrap();
+        });
+        let backend = WorkspaceHttpTicketBackend::new(Arc::new(
+            crate::worker::TestWorkspaceHttpClient::new("workspace-a", format!("http://{addr}")),
+        ));
+
+        let relation = backend
+            .add_ticket_relation(
+                TicketIdOrSlug::Id("01SOURCE".to_string()),
+                NewTicketRelation {
+                    kind: TicketRelationKind::DependsOn,
+                    target: "01TARGET".to_string(),
+                    note: None,
+                    author: None,
+                },
+            )
+            .unwrap();
+
+        server.join().unwrap();
+        assert_eq!(relation.ticket_id, "T-1");
+        assert_eq!(relation.target, "T-2");
+        assert_eq!(relation.author, "workspace");
+    }
+
    #[test]
    fn workspace_http_backend_deletes_exact_ticket_relation() {
        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
        let base_url = format!("http://{}", listener.local_addr().unwrap());
        let server = thread::spawn(move || {
+            for (expected_path, resource_key) in [
+                ("GET /api/w/workspace-a/tickets/01SOURCE HTTP/1.1", "T-1"),
+                ("GET /api/w/workspace-a/tickets/01TARGET HTTP/1.1", "T-2"),
+            ] {
+                let (mut stream, _) = listener.accept().unwrap();
+                let mut buffer = [0_u8; 8192];
+                let len = stream.read(&mut buffer).unwrap();
+                let request = String::from_utf8_lossy(&buffer[..len]);
+                assert!(request.starts_with(expected_path));
+                let response_body = serde_json::json!({
+                    "meta": {"resource_key": resource_key}
+                })
+                .to_string();
+                write!(
+                    stream,
+                    "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                    response_body.len(),
+                    response_body
+                )
+                .unwrap();
+            }
+
            let (mut stream, _) = listener.accept().unwrap();
            let mut buffer = [0_u8; 8192];
            let len = stream.read(&mut buffer).unwrap();
@@ -1766,8 +2051,56 @@ provider = "github"
            .unwrap();

        server.join().unwrap();
-        assert_eq!(removed.ticket_id, "01SOURCE");
-        assert_eq!(removed.target, "01TARGET");
+        assert_eq!(removed.ticket_id, "T-1");
+        assert_eq!(removed.target, "T-2");
+    }
+
+    #[test]
+    fn workspace_ticket_service_preserves_internal_identity_for_handoff() {
+        let temp = TempDir::new().unwrap();
+        let local = LocalTicketBackend::new(temp.path().join("tickets"));
+        let created = local.create(NewTicket::new("Ticket handoff")).unwrap();
+        let mut ticket = local.show(TicketIdOrSlug::Id(created.id.clone())).unwrap();
+        ticket.meta.resource_key = Some("T-548".to_string());
+        ticket.meta.workflow_state = TicketWorkflowState::Queued;
+
+        let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+        let base_url = format!("http://{}", listener.local_addr().unwrap());
+        let response_body = serde_json::to_string(&ticket).unwrap();
+        let server = thread::spawn(move || {
+            let (mut stream, _) = listener.accept().unwrap();
+            let mut buffer = [0_u8; 8192];
+            let len = stream.read(&mut buffer).unwrap();
+            let request = String::from_utf8_lossy(&buffer[..len]);
+            assert!(request.starts_with("GET /api/w/workspace-a/tickets/T-548/record HTTP/1.1"));
+            write!(
+                stream,
+                "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n{}",
+                response_body.len(),
+                response_body
+            )
+            .unwrap();
+        });
+
+        let service = WorkspaceTicketService {
+            backend: WorkspaceHttpTicketBackend::new(Arc::new(
+                crate::worker::TestWorkspaceHttpClient::new("workspace-a", base_url),
+            )),
+        };
+        let handoff = service.ticket_handoff("T-548").unwrap();
+
+        server.join().unwrap();
+        assert_eq!(handoff.id, created.id);
+        assert_eq!(handoff.resource_key, "T-548");
+        assert_eq!(handoff.workflow_state, TicketWorkflowState::Queued);
+    }
+
+    #[test]
+    fn ticket_handoff_accepts_only_canonical_ticket_resource_keys() {
+        assert!(is_canonical_ticket_resource_key("T-482"));
+        for invalid in ["", "00001KZVNXFNK", "T-", "T-key", "O-482"] {
+            assert!(!is_canonical_ticket_resource_key(invalid));
+        }
    }

    #[test]
@@ -1,11 +1,12 @@
 use std::sync::Arc;

+#[cfg(test)]
 use agen::Item;
 use agen::tool::{Tool, ToolDefinition, ToolError, ToolMeta, ToolOutput};
 use async_trait::async_trait;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
-use session_store::collect_state;
+use session_store::{LogEntry, collect_state};

 use super::manage_worker::{WORKER_CONTROL_SERVICE_ID, WorkerControlService};
 use crate::feature::{
@@ -60,7 +61,27 @@ pub struct WorkerObservationSubject {
 #[derive(Debug, Clone)]
 pub struct WorkerSessionCapture {
    pub segment_id: String,
-    pub items: Vec<Item>,
+    pub entries: Vec<agen::HistoryEntry<crate::SessionHistoryMetadata>>,
+}
+
+impl WorkerSessionCapture {
+    pub fn from_log_entries(
+        segment_id: impl Into<String>,
+        log_entries: &[LogEntry],
+    ) -> Result<Self, String> {
+        let segment_id = segment_id.into();
+        let state = collect_state(log_entries);
+        let parsed_segment_id = segment_id.parse().unwrap_or_default();
+        let entries = crate::session_history::restore_history_entries(
+            state.session_id.unwrap_or_default(),
+            parsed_segment_id,
+            log_entries,
+        )?;
+        Ok(Self {
+            segment_id,
+            entries,
+        })
+    }
 }

 #[derive(Debug, thiserror::Error)]
@@ -161,9 +182,17 @@ impl WorkerObservationProvider for WorkspaceClientWorkerObservationProvider {
            })
            .collect::<Result<Vec<session_store::LogEntry>, _>>()?;
        let state = collect_state(&entries);
+        let segment_id = response.segment_id;
+        let parsed_segment_id = segment_id.parse().unwrap_or_default();
+        let typed_entries = crate::session_history::restore_history_entries(
+            state.session_id.unwrap_or_default(),
+            parsed_segment_id,
+            &entries,
+        )
+        .map_err(WorkerObservationError::Unavailable)?;
        Ok(WorkerSessionCapture {
-            segment_id: response.segment_id,
-            items: state.history,
+            segment_id,
+            entries: typed_entries,
        })
    }
 }
@@ -392,9 +421,15 @@ impl WorkerObservationProvider for SpawnedSubWorkerObservationProvider {
            .ok_or(WorkerObservationError::NotFound)?;
        let entries = record.session.entries();
        let state = collect_state(&entries);
+        let typed_entries = crate::session_history::restore_history_entries(
+            state.session_id.unwrap_or_default(),
+            Default::default(),
+            &entries,
+        )
+        .map_err(WorkerObservationError::Unavailable)?;
        Ok(WorkerSessionCapture {
            segment_id: format!("subworker:{name}"),
-            items: state.history,
+            entries: typed_entries,
        })
    }
 }
@@ -508,6 +543,7 @@ impl Tool for ViewSessionOverviewTool {
            .map(|entry| {
                serde_json::json!({
                    "entry_ref": entry.id,
+                    "origin": entry.origin,
                    "entry_range": entry.entry_range,
                    "kind": entry.kind.as_str(),
                    "label": entry.label,
@@ -547,7 +583,7 @@ impl Tool for SearchSessionEntriesTool {
        let from = params.from.as_deref().map(parse_entry_ref).transpose()?;
        let through = params.through.as_deref().map(parse_entry_ref).transpose()?;
        if let (Some(from), Some(through)) = (&from, &through) {
-            if from.source_index() > through.source_index() {
+            if view.source_index_for_ref(from) > view.source_index_for_ref(through) {
                return Err(ToolError::InvalidArgument(
                    "SearchSessionEntries from must not be after through".to_string(),
                ));
@@ -573,6 +609,7 @@ impl Tool for SearchSessionEntriesTool {
            .map(|entry| {
                serde_json::json!({
                    "entry_ref": entry.id,
+                    "origin": entry.origin,
                    "entry_range": entry.entry_range,
                    "kind": entry.kind.as_str(),
                    "tool_part": entry.tool_part.map(|part| format!("{part:?}").to_lowercase()),
@@ -628,6 +665,7 @@ impl Tool for ReadSessionEntryTool {
            .map(|entry| {
                serde_json::json!({
                    "entry_ref": entry.id,
+                    "origin": entry.origin,
                    "entry_range": entry.entry_range,
                    "kind": entry.kind.as_str(),
                    "tool_part": entry.tool_part.map(|part| format!("{part:?}").to_lowercase()),
@@ -661,7 +699,10 @@ async fn latest_view(
        .capture_worker_session(subject)
        .await
        .map_err(tool_error)?;
-    Ok(SessionCapture::new(capture.segment_id, capture.items))
+    Ok(SessionCapture::from_history_entries(
+        capture.segment_id,
+        capture.entries,
+    ))
 }

 fn parse_input<T: serde::de::DeserializeOwned>(
@@ -751,9 +792,23 @@ mod tests {
            if subject != &granted_subject() {
                return Err(WorkerObservationError::NotFound);
            }
+            let entries = self
+                .captures
+                .lock()
+                .unwrap()
+                .clone()
+                .into_iter()
+                .enumerate()
+                .map(|(index, item)| {
+                    let mut metadata = crate::SessionHistoryMetadata::legacy_unknown();
+                    metadata.entry_id =
+                        session_store::LoggedSessionHistoryEntryId(format!("fake-{index:08}"));
+                    agen::HistoryEntry::new(item, metadata)
+                })
+                .collect();
            Ok(WorkerSessionCapture {
                segment_id: "segment".to_string(),
-                items: self.captures.lock().unwrap().clone(),
+                entries,
            })
        }
    }
@@ -796,7 +851,7 @@ mod tests {
        let read = read_definition(provider.clone())().1;
        let hidden = read
            .execute(
-                r#"{"subject":{"kind":"runtime_worker","runtime_id":"runtime-1","worker_id":"unauthorized"},"entry_ref":"E00000000"}"#,
+                r#"{"subject":{"kind":"runtime_worker","runtime_id":"runtime-1","worker_id":"unauthorized"},"entry_ref":"Efake-00000000"}"#,
                agen::tool::ToolExecutionContext::direct(),
            )
            .await
@@ -810,7 +865,7 @@ mod tests {
            .push(message("a1", Role::Assistant, "second"));
        let output = read
            .execute(
-                r#"{"subject":{"kind":"runtime_worker","runtime_id":"runtime-1","worker_id":"granted"},"entry_ref":"E00000000"}"#,
+                r#"{"subject":{"kind":"runtime_worker","runtime_id":"runtime-1","worker_id":"granted"},"entry_ref":"Efake-00000000"}"#,
                agen::tool::ToolExecutionContext::direct(),
            )
            .await
@@ -819,7 +874,7 @@ mod tests {

        let output = read
            .execute(
-                r#"{"subject":{"kind":"runtime_worker","runtime_id":"runtime-1","worker_id":"granted"},"entry_ref":"E00000001"}"#,
+                r#"{"subject":{"kind":"runtime_worker","runtime_id":"runtime-1","worker_id":"granted"},"entry_ref":"Efake-00000001"}"#,
                agen::tool::ToolExecutionContext::direct(),
            )
            .await
@@ -10,7 +10,7 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};

 use agen::timeline::event::UsageEvent;
-use agen::{Engine, llm_client::LlmClient};
+use agen::{Engine, EngineError, llm_client::LlmClient};
 use manifest::{Scope, WorkerManifest};
 use protocol::{Event, InFlightSnapshot, WorkerStatus};
 use session_store::{LogEntry, SegmentId, SessionId, Store, StoreError, TraceEntry};
@@ -43,6 +43,8 @@ pub(crate) struct InternalWorkerAuthority {
    pub workspace: WorkerWorkspaceContext,
    pub filesystem: WorkerFilesystemAuthority,
    pub scope: Scope,
+    /// Provider-bound session inherited in an attenuated form from the owner.
+    pub workdir_session: Option<workdir::WorkdirSessionHandle>,
 }

 pub(crate) struct InternalWorkerSpec {
@@ -53,6 +55,17 @@ pub(crate) struct InternalWorkerSpec {
    pub input: String,
    pub cache_key: Option<String>,
    pub max_turns: Option<u32>,
+    pub engine_configurator: Option<
+        Box<
+            dyn FnOnce(
+                    &mut Engine<
+                        Box<dyn LlmClient>,
+                        agen::state::Mutable,
+                        crate::SessionHistoryMetadata,
+                    >,
+                ) + Send,
+        >,
+    >,
    pub features: FeatureRegistryBuilder,
    pub required_tools: &'static [&'static str],
    pub authority: InternalWorkerAuthority,
@@ -102,6 +115,7 @@ where
        input,
        cache_key,
        max_turns,
+        engine_configurator,
        features,
        required_tools,
        authority,
@@ -120,7 +134,9 @@ where

    let last_usage = Arc::new(Mutex::new(None::<UsageEvent>));
    let usage_slot = last_usage.clone();
-    let mut engine = Engine::new(client).system_prompt(system_prompt);
+    let mut engine =
+        Engine::<_, agen::state::Mutable, crate::SessionHistoryMetadata>::new_annotated(client)
+            .system_prompt(system_prompt);
    engine.on_usage(move |usage| {
        if let Ok(mut slot) = usage_slot.lock() {
            *slot = Some(usage.clone());
@@ -128,7 +144,11 @@ where
    });
    engine.set_cache_key(cache_key);
    engine.set_max_turns(max_turns);
+    if let Some(configure) = engine_configurator {
+        configure(&mut engine);
+    }
    let store = EphemeralSessionStore::default();
+    let inherited_workdir_session = authority.workdir_session.clone();
    let mut worker = Worker::new(
        manifest,
        engine,
@@ -144,6 +164,9 @@ where
        identity: identity.clone(),
        history_entries: 0,
    })?;
+    if let Some(session) = inherited_workdir_session {
+        worker.bind_workdir_session(Some(session));
+    }

    let install_report = worker.install_features(features);
    let installed_tools = install_report.installed_tool_names();
@@ -188,12 +211,28 @@ where
    on_cancel_sender(worker.engine_mut().cancel_sender());

    match worker.run_text(&input).await {
-        Ok(lifecycle) => Ok(InternalWorkerResult {
+        Ok(lifecycle @ WorkerRunResult::Finished)
+        | Ok(lifecycle @ WorkerRunResult::Paused)
+        | Ok(lifecycle @ WorkerRunResult::RolledBack) => Ok(InternalWorkerResult {
            usage: last_usage.lock().ok().and_then(|slot| slot.clone()),
            identity,
            lifecycle,
            history_entries: store.entries_count(session_id, segment_id),
        }),
+        Ok(WorkerRunResult::LimitReached) => Err(InternalWorkerError {
+            source: WorkerError::Engine(EngineError::Aborted(
+                "internal Worker reached its turn limit".to_string(),
+            )),
+            usage: last_usage.lock().ok().and_then(|slot| slot.clone()),
+            identity,
+            history_entries: store.entries_count(session_id, segment_id),
+        }),
+        Ok(WorkerRunResult::Interrupted { message, .. }) => Err(InternalWorkerError {
+            source: WorkerError::Engine(EngineError::Aborted(message)),
+            usage: last_usage.lock().ok().and_then(|slot| slot.clone()),
+            identity,
+            history_entries: store.entries_count(session_id, segment_id),
+        }),
        Err(source) => Err(InternalWorkerError {
            source,
            usage: last_usage.lock().ok().and_then(|slot| slot.clone()),
@@ -221,6 +260,7 @@ impl Default for InternalWorkerVisibility {
 pub(crate) enum InternalWorkerSessionStatus {
    Idle,
    Running,
+    Paused,
    Stopping,
    Stopped,
    Failed,
@@ -231,9 +271,10 @@ impl InternalWorkerSessionStatus {
        match self {
            Self::Idle => 0,
            Self::Running => 1,
-            Self::Stopping => 2,
-            Self::Stopped => 3,
-            Self::Failed => 4,
+            Self::Paused => 2,
+            Self::Stopping => 3,
+            Self::Stopped => 4,
+            Self::Failed => 5,
        }
    }

@@ -241,16 +282,37 @@ impl InternalWorkerSessionStatus {
        match value {
            0 => Self::Idle,
            1 => Self::Running,
-            2 => Self::Stopping,
-            3 => Self::Stopped,
+            2 => Self::Paused,
+            3 => Self::Stopping,
+            4 => Self::Stopped,
            _ => Self::Failed,
        }
    }
 }

+fn classify_internal_turn_result(
+    result: Result<WorkerRunResult, WorkerError>,
+) -> (InternalWorkerSessionStatus, Option<String>) {
+    match result {
+        Ok(WorkerRunResult::Finished) => (InternalWorkerSessionStatus::Idle, None),
+        Ok(WorkerRunResult::Paused) => (InternalWorkerSessionStatus::Paused, None),
+        Ok(WorkerRunResult::LimitReached) => (
+            InternalWorkerSessionStatus::Stopped,
+            Some("internal Worker reached its turn limit".to_string()),
+        ),
+        Ok(WorkerRunResult::Interrupted { message, .. }) => {
+            (InternalWorkerSessionStatus::Stopped, Some(message))
+        }
+        Ok(WorkerRunResult::RolledBack) => (
+            InternalWorkerSessionStatus::Stopped,
+            Some("internal Worker run was cancelled before AI output".to_string()),
+        ),
+        Err(error) => (InternalWorkerSessionStatus::Failed, Some(error.to_string())),
+    }
+}
+
 #[derive(Debug, thiserror::Error)]
 pub(crate) enum InternalWorkerSessionError {
-    #[cfg(test)]
    #[error("failed to build internal Worker session: {message}")]
    Build { message: String },
    #[error("internal Worker session is busy")]
@@ -343,10 +405,11 @@ impl InternalWorkerSessionHandle {
            entries,
            status: match self.status() {
                InternalWorkerSessionStatus::Running => WorkerStatus::Running,
+                InternalWorkerSessionStatus::Paused => WorkerStatus::Paused,
                InternalWorkerSessionStatus::Idle => WorkerStatus::Idle,
                InternalWorkerSessionStatus::Stopping
                | InternalWorkerSessionStatus::Stopped
-                | InternalWorkerSessionStatus::Failed => WorkerStatus::Paused,
+                | InternalWorkerSessionStatus::Failed => WorkerStatus::Stopped,
            },
            error: self.last_error.lock().unwrap().clone(),
            in_flight,
@@ -378,6 +441,7 @@ impl InternalWorkerSessionHandle {
            .map_err(
                |current| match InternalWorkerSessionStatus::decode(current) {
                    InternalWorkerSessionStatus::Running
+                    | InternalWorkerSessionStatus::Paused
                    | InternalWorkerSessionStatus::Stopping => InternalWorkerSessionError::Busy,
                    InternalWorkerSessionStatus::Stopped | InternalWorkerSessionStatus::Failed => {
                        InternalWorkerSessionError::Stopped
@@ -410,7 +474,6 @@ impl InternalWorkerSessionHandle {
        Ok(())
    }

-    #[cfg(test)]
    pub(crate) async fn wait_until_idle(&self) -> InternalWorkerSessionStatus {
        loop {
            let notified = self.state_changed.notified();
@@ -475,6 +538,7 @@ pub(crate) async fn spawn_internal_worker_session(
        input,
        cache_key,
        max_turns,
+        engine_configurator,
        features,
        required_tools,
        authority,
@@ -484,7 +548,9 @@ pub(crate) async fn spawn_internal_worker_session(

    let last_usage = Arc::new(Mutex::new(None::<UsageEvent>));
    let usage_slot = last_usage.clone();
-    let mut engine = Engine::new(client).system_prompt(system_prompt);
+    let mut engine =
+        Engine::<_, agen::state::Mutable, crate::SessionHistoryMetadata>::new_annotated(client)
+            .system_prompt(system_prompt);
    engine.on_usage(move |usage| {
        if let Ok(mut slot) = usage_slot.lock() {
            *slot = Some(usage.clone());
@@ -492,7 +558,11 @@ pub(crate) async fn spawn_internal_worker_session(
    });
    engine.set_cache_key(cache_key);
    engine.set_max_turns(max_turns);
+    if let Some(configure) = engine_configurator {
+        configure(&mut engine);
+    }
    let store = EphemeralSessionStore::default();
+    let inherited_workdir_session = authority.workdir_session.clone();
    let mut worker = Worker::new(
        manifest,
        engine,
@@ -505,6 +575,9 @@ pub(crate) async fn spawn_internal_worker_session(
    .map_err(|source| InternalWorkerSessionError::Build {
        message: source.to_string(),
    })?;
+    if let Some(session) = inherited_workdir_session {
+        worker.bind_workdir_session(Some(session));
+    }
    let install_report = worker.install_features(features);
    let installed_tools = install_report.installed_tool_names();
    let install_failed = install_report
@@ -539,6 +612,104 @@ pub(crate) async fn spawn_internal_worker_session(
    spawn_prepared_internal_worker_session(worker, store, input, None).await
 }

+/// Prepare an observable Internal Worker from the same bounded spec as one-shot
+/// helpers, but do not start its first turn. The owner must register the returned
+/// handle before calling `send`, preserving the snapshot/live boundary.
+pub(crate) fn prepare_internal_worker_from_spec(
+    spec: InternalWorkerSpec,
+    visibility: InternalWorkerVisibility,
+) -> std::pin::Pin<
+    Box<
+        dyn std::future::Future<
+                Output = Result<InternalWorkerSessionHandle, InternalWorkerSessionError>,
+            > + Send,
+    >,
+> {
+    Box::pin(async move {
+        let InternalWorkerSpec {
+            identity,
+            mut manifest,
+            client,
+            system_prompt,
+            input: _,
+            cache_key,
+            max_turns,
+            engine_configurator,
+            features,
+            required_tools,
+            authority,
+        } = spec;
+        manifest.worker.name = format!("internal-{}-{}", identity.kind, identity.run_id);
+        manifest.feature = Default::default();
+        manifest.plugins = Default::default();
+        manifest.mcp = Default::default();
+        manifest.skills = None;
+        manifest.compaction = None;
+        manifest.memory = None;
+
+        let mut engine =
+            Engine::<_, agen::state::Mutable, crate::SessionHistoryMetadata>::new_annotated(client)
+                .system_prompt(system_prompt);
+        engine.set_cache_key(cache_key);
+        engine.set_max_turns(max_turns);
+        if let Some(configure) = engine_configurator {
+            configure(&mut engine);
+        }
+        let store = EphemeralSessionStore::default();
+        let inherited_workdir_session = authority.workdir_session.clone();
+        let mut worker = Worker::new(
+            manifest,
+            engine,
+            store.clone(),
+            authority.workspace,
+            authority.filesystem,
+            authority.scope,
+        )
+        .await
+        .map_err(|source| InternalWorkerSessionError::Build {
+            message: source.to_string(),
+        })?;
+        if let Some(session) = inherited_workdir_session {
+            worker.bind_workdir_session(Some(session));
+        }
+        let install_report = worker.install_features(features);
+        let installed_tools = install_report.installed_tool_names();
+        let install_failed = install_report
+            .reports
+            .iter()
+            .any(|report| !report.installed);
+        let missing = required_tools
+            .iter()
+            .filter(|required| {
+                !installed_tools
+                    .iter()
+                    .any(|installed| installed == **required)
+            })
+            .copied()
+            .collect::<Vec<_>>();
+        if install_failed || !missing.is_empty() {
+            let diagnostics = install_report
+                .reports
+                .iter()
+                .flat_map(|report| report.diagnostics.iter())
+                .map(|diagnostic| diagnostic.message.as_str())
+                .collect::<Vec<_>>()
+                .join("; ");
+            return Err(InternalWorkerSessionError::Build {
+                message: format!(
+                    "internal Worker feature installation failed: {diagnostics}; missing tools: {}",
+                    missing.join(", ")
+                ),
+            });
+        }
+
+        Box::pin(prepare_internal_worker_session(
+            worker, store, visibility, None, None,
+        ))
+        .await
+    })
+}
+
 fn spawn_internal_log_event_bridge(sink: SegmentLogSink, event_tx: broadcast::Sender<Event>) {
    let (_, mut log_rx) = sink.subscribe_with_snapshot();
    tokio::spawn(async move {
@@ -620,13 +791,7 @@ pub(crate) async fn prepare_internal_worker_session(
                    loop {
                        tokio::select! {
                            result = &mut run => {
-                                let (turn_status, error) = match result {
-                                    Ok(_) => (InternalWorkerSessionStatus::Idle, None),
-                                    Err(error) => (
-                                        InternalWorkerSessionStatus::Failed,
-                                        Some(error.to_string()),
-                                    ),
-                                };
+                                let (turn_status, error) = classify_internal_turn_result(result);
                                actor_in_flight.clear();
                                status.store(turn_status.encode(), std::sync::atomic::Ordering::Release);
                                if let Some(message) = error {
@@ -635,11 +800,20 @@ pub(crate) async fn prepare_internal_worker_session(
                                        code: protocol::ErrorCode::Internal,
                                        message,
                                    });
-                                } else {
-                                    let _ = event_tx.send(Event::Status {
-                                        status: WorkerStatus::Idle,
-                                    });
                                }
+                                let protocol_status = match turn_status {
+                                    InternalWorkerSessionStatus::Idle => WorkerStatus::Idle,
+                                    InternalWorkerSessionStatus::Paused => WorkerStatus::Paused,
+                                    InternalWorkerSessionStatus::Stopped
+                                    | InternalWorkerSessionStatus::Failed => WorkerStatus::Stopped,
+                                    InternalWorkerSessionStatus::Running
+                                    | InternalWorkerSessionStatus::Stopping => {
+                                        unreachable!("run completion cannot remain active")
+                                    }
+                                };
+                                let _ = event_tx.send(Event::Status {
+                                    status: protocol_status,
+                                });
                                if let Some(callback) = &on_turn_end {
                                    callback(turn_status);
                                }
@@ -653,7 +827,7 @@ pub(crate) async fn prepare_internal_worker_session(
                                        let _ = (&mut run).await;
                                        actor_in_flight.clear();
                                        status.store(InternalWorkerSessionStatus::Stopped.encode(), std::sync::atomic::Ordering::Release);
-                                        let _ = event_tx.send(Event::Status { status: WorkerStatus::Paused });
+                                        let _ = event_tx.send(Event::Status { status: WorkerStatus::Stopped });
                                        let _ = event_tx.send(Event::Shutdown);
                                        state_changed.notify_waiters();
                                        let _ = done.send(());
@@ -679,7 +853,7 @@ pub(crate) async fn prepare_internal_worker_session(
                        std::sync::atomic::Ordering::Release,
                    );
                    let _ = event_tx.send(Event::Status {
-                        status: WorkerStatus::Paused,
+                        status: WorkerStatus::Stopped,
                    });
                    let _ = event_tx.send(Event::Shutdown);
                    state_changed.notify_waiters();
@@ -989,6 +1163,26 @@ mod tests {
        }
    }

+    #[derive(Clone)]
+    struct FailingClient;
+
+    #[async_trait]
+    impl LlmClient for FailingClient {
+        fn clone_boxed(&self) -> Box<dyn LlmClient> {
+            Box::new(self.clone())
+        }
+
+        async fn stream(
+            &self,
+            _request: Request,
+        ) -> Result<Pin<Box<dyn Stream<Item = Result<LlmEvent, ClientError>> + Send>>, ClientError>
+        {
+            Err(ClientError::Config(
+                "intentional internal failure".to_string(),
+            ))
+        }
+    }
+
    #[derive(Clone)]
    struct CancelBeforeAiClient {
        calls: Arc<AtomicUsize>,
@@ -1076,12 +1270,14 @@ permission = "write"
            input: "input".to_string(),
            cache_key: Some("internal-test".to_string()),
            max_turns: Some(1),
+            engine_configurator: None,
            features: FeatureRegistryBuilder::new(),
            required_tools,
            authority: InternalWorkerAuthority {
                workspace: WorkerWorkspaceContext::no_workspace(),
                filesystem: WorkerFilesystemAuthority::None,
                scope: Scope::empty(),
+                workdir_session: None,
            },
        }
    }
@@ -1100,6 +1296,77 @@ permission = "write"
        assert_eq!(result.identity.kind, "test");
    }

+    #[test]
+    fn internal_turn_result_mapping_is_exhaustive() {
+        let cases = [
+            (
+                WorkerRunResult::Finished,
+                InternalWorkerSessionStatus::Idle,
+                false,
+            ),
+            (
+                WorkerRunResult::Paused,
+                InternalWorkerSessionStatus::Paused,
+                false,
+            ),
+            (
+                WorkerRunResult::LimitReached,
+                InternalWorkerSessionStatus::Stopped,
+                true,
+            ),
+            (
+                WorkerRunResult::Interrupted {
+                    code: protocol::ErrorCode::Internal,
+                    message: "cancelled".to_string(),
+                },
+                InternalWorkerSessionStatus::Stopped,
+                true,
+            ),
+            (
+                WorkerRunResult::RolledBack,
+                InternalWorkerSessionStatus::Stopped,
+                true,
+            ),
+        ];
+
+        for (result, expected_status, expects_error) in cases {
+            let (status, error) = classify_internal_turn_result(Ok(result));
+            assert_eq!(status, expected_status);
+            assert_eq!(error.is_some(), expects_error);
+        }
+
+        let (status, error) = classify_internal_turn_result(Err(WorkerError::Engine(
+            EngineError::Aborted("fatal".to_string()),
+        )));
+        assert_eq!(status, InternalWorkerSessionStatus::Failed);
+        assert!(error.is_some_and(|message| message.contains("fatal")));
+    }
+
+    #[tokio::test]
+    async fn fatal_internal_run_transitions_to_stopped_protocol_status() {
+        let calls = Arc::new(AtomicUsize::new(0));
+        let mut internal_spec = spec(calls, &[]);
+        internal_spec.client = Box::new(FailingClient);
+
+        let handle = spawn_internal_worker_session(internal_spec)
+            .await
+            .expect("spawn failing Internal Worker session");
+        assert_eq!(
+            handle.wait_until_idle().await,
+            InternalWorkerSessionStatus::Stopped
+        );
+        assert_eq!(handle.status(), InternalWorkerSessionStatus::Stopped);
+        assert_eq!(handle.protocol_snapshot().status, WorkerStatus::Stopped);
+        assert!(
+            handle
+                .last_error
+                .lock()
+                .unwrap()
+                .as_ref()
+                .is_some_and(|message| message.contains("intentional internal failure"))
+        );
+    }
+
    #[tokio::test]
    async fn session_accepts_follow_up_turns_and_stops_without_runtime_registration() {
        let calls = Arc::new(AtomicUsize::new(0));
@@ -13,7 +13,7 @@

 #[cfg(test)]
 use crate::prompt::catalog::PromptCatalog;
-use agen::Item;
+use agen::{Item, ToolResultDisposition};

 /// Build synthetic `Item::ToolResult` items for every unanswered
 /// `Item::ToolCall` in `history`, preserving order.
@@ -28,7 +28,16 @@ pub(crate) fn orphan_tool_result_closures(history: &[Item], summary: &str) -> Ve
    for item in history {
        if let Item::ToolCall { call_id, .. } = item {
            if !answered.contains(call_id.as_str()) {
-                out.push(Item::tool_result(call_id.clone(), summary));
+                out.push(Item::tool_result_item_with_disposition_and_attachments(
+                    call_id.clone(),
+                    summary,
+                    Some(
+                        "Execution ended before completion could be confirmed. Completion and side effects are unknown."
+                            .to_string(),
+                    ),
+                    ToolResultDisposition::OutcomeUnknown,
+                    Vec::new(),
+                ));
            }
        }
    }
@@ -77,10 +86,12 @@ mod tests {
            Item::ToolResult {
                call_id,
                summary: got,
+                disposition,
                ..
            } => {
                assert_eq!(call_id, "c1");
                assert_eq!(got, &summary);
+                assert_eq!(*disposition, ToolResultDisposition::OutcomeUnknown);
            }
            other => panic!("expected ToolResult, got {other:?}"),
        }
@@ -8,6 +8,7 @@
 //! decisions (continue / skip / abort / pause).

 use std::borrow::Cow;
+use std::collections::VecDeque;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex};

@@ -33,7 +34,9 @@ use crate::hook::{
 };
 use crate::ipc::notify_buffer::{NotifyBuffer, build_system_item_with_provenance};
 use crate::prompt::catalog::PromptCatalog;
+use crate::session_history::SessionHistoryMetadata;
 use crate::worker::SystemItemCommitter;
+use agen::HistoryEntry;
 use agen::token_counter::total_tokens;

 /// Maximum number of bytes copied into `TurnEndInfo::final_text_preview`.
@@ -73,6 +76,7 @@ pub(crate) struct WorkerInterceptor {
    /// worker. `None` in tests / `Worker::new` paths where no writer is
    /// attached.
    log_writer: Option<Arc<dyn SystemItemCommitter>>,
+    pending_committed_history: Arc<Mutex<VecDeque<HistoryEntry<SessionHistoryMetadata>>>>,
    /// Next turn index assigned by `on_prompt_submit`.
    next_turn_index: AtomicUsize,
    /// Tool calls observed in the current turn (reset on each new prompt).
@@ -80,6 +84,7 @@ pub(crate) struct WorkerInterceptor {
 }

 impl WorkerInterceptor {
+    #[cfg(test)]
    pub(crate) fn new(
        registry: Arc<HookRegistry>,
        compact_state: Option<Arc<CompactState>>,
@@ -88,6 +93,28 @@ impl WorkerInterceptor {
        pending_attachments: Arc<Mutex<Vec<SystemItem>>>,
        prompts: Arc<ArcSwap<PromptCatalog>>,
        log_writer: Option<Arc<dyn SystemItemCommitter>>,
+    ) -> Self {
+        Self::new_with_history_queue(
+            registry,
+            compact_state,
+            usage_history,
+            pending_notifies,
+            pending_attachments,
+            prompts,
+            log_writer,
+            Arc::new(Mutex::new(VecDeque::new())),
+        )
+    }
+
+    pub(crate) fn new_with_history_queue(
+        registry: Arc<HookRegistry>,
+        compact_state: Option<Arc<CompactState>>,
+        usage_history: Option<Arc<Mutex<Vec<UsageRecord>>>>,
+        pending_notifies: NotifyBuffer,
+        pending_attachments: Arc<Mutex<Vec<SystemItem>>>,
+        prompts: Arc<ArcSwap<PromptCatalog>>,
+        log_writer: Option<Arc<dyn SystemItemCommitter>>,
+        pending_committed_history: Arc<Mutex<VecDeque<HistoryEntry<SessionHistoryMetadata>>>>,
    ) -> Self {
        Self {
            registry,
@@ -99,6 +126,7 @@ impl WorkerInterceptor {
            prompts,
            prompt_workspace_id: None,
            log_writer,
+            pending_committed_history,
            next_turn_index: AtomicUsize::new(0),
            tool_calls_this_turn: AtomicUsize::new(0),
        }
@@ -125,7 +153,11 @@ impl WorkerInterceptor {
            return Ok(());
        };
        for item in items {
-            writer.commit_system_item(item.clone())?;
+            let entry = writer.commit_system_item(item.clone())?;
+            self.pending_committed_history
+                .lock()
+                .expect("pending committed history poisoned")
+                .push_back(entry);
        }
        Ok(())
    }
@@ -507,7 +539,12 @@ mod tests {
            &self,
            entry: session_store::LogEntry,
        ) -> Result<(), session_store::StoreError> {
-            if let session_store::LogEntry::SystemItem { item, .. } = entry {
+            let item = match entry {
+                session_store::LogEntry::SystemItem { item, .. } => Some(item),
+                session_store::LogEntry::AnnotatedSystemItem { entry, .. } => Some(entry.item),
+                _ => None,
+            };
+            if let Some(item) = item {
                self.committed
                    .lock()
                    .expect("committed system-item list poisoned")
@@ -29,15 +29,21 @@ pub fn subscribe_worker_protocol_session(handle: &WorkerHandle) -> WorkerProtoco

 pub fn live_log_entry_event(entry: LogEntry) -> Option<Event> {
    match entry {
-        LogEntry::SegmentStart { .. } => {
+        entry @ (LogEntry::SegmentStart { .. } | LogEntry::AnnotatedSegmentStart { .. }) => {
            let value = serde_json::to_value(&entry).expect("LogEntry is Serialize");
            Some(Event::SegmentRotated { entry: value })
        }
-        LogEntry::UserInput { segments, .. } => Some(Event::UserMessage { segments }),
+        LogEntry::UserInput { segments, .. } | LogEntry::AnnotatedUserInput { segments, .. } => {
+            Some(Event::UserMessage { segments })
+        }
        LogEntry::SystemItem { item, .. } => {
            let value = serde_json::to_value(&item).expect("SystemItem is Serialize");
            Some(Event::SystemItem { item: value })
        }
+        LogEntry::AnnotatedSystemItem { entry, .. } => {
+            let value = serde_json::to_value(&entry.item).expect("SystemItem is Serialize");
+            Some(Event::SystemItem { item: value })
+        }
        LogEntry::Invoke { trigger, .. } => Some(Event::InvokeStart { kind: trigger }),
        other => {
            // `SegmentLogSink::is_live_relevant` keeps non-live-relevant
@@ -12,6 +12,7 @@ pub mod prompt;
 pub mod runtime;
 pub mod segment_log_sink;
 mod session_capture;
+mod session_history;
 pub mod shared_state;
 mod shutdown_after_idle;
 pub mod skill;
@@ -33,14 +34,19 @@ pub use manifest::{
 };
 pub use model_client::{ProviderError, build_client};
 pub use prompt::catalog::{
-    CatalogError, EffectivePromptCatalog, PromptCatalog, WorkerPrompt, WorkspacePromptProjection,
-    prompt_schema_source,
+    CatalogError, EffectivePromptCatalog, OrchestratorQueueAttentionContext,
+    OrchestratorQueueAttentionPrompt, OrchestratorQueueAttentionTicket, PromptCatalog,
+    WorkerPrompt, WorkspacePromptProjection, prompt_schema_source,
 };
 pub use prompt::source::PromptCatalogSource;
 pub use prompt::system::{SystemPromptContext, SystemPromptError, SystemPromptTemplate};
 pub use protocol::{ErrorCode, Event, Method, TurnResult, WorkerStatus};
 pub use runtime::dir::RuntimeDir;
 pub use segment_log_sink::SegmentLogSink;
+pub use session_history::{
+    SessionHistoryDerivation, SessionHistoryEntryId, SessionHistoryMetadata,
+    WorkerHistoryProvenance, WorkerSubjectSnapshot,
+};
 pub use shared_state::WorkerSharedState;
 pub use worker::{
    LocalWorkingDirectory, WORKER_INPUT_SUBMISSION_EXTENSION_DOMAIN, Worker, WorkerError,
@@ -34,7 +34,7 @@ impl PermissionHook {
    }
 }

-impl<C: LlmClient, St: Store> Worker<C, St> {
+impl<C: LlmClient + 'static, St: Store> Worker<C, St> {
    pub(crate) fn apply_permissions_from_manifest(&mut self) {
        let Some(permissions) = self.manifest().permissions.clone() else {
            return;
@@ -102,7 +102,6 @@ pub enum WorkerPrompt {
    AgentsMdSection,
    ResidentMemorySummarySection,
    WorkerOrchestrationGuidanceSection,
-    TicketEventCompanionNotice,
    SubWorkerSpawnToolDescription,
 }

@@ -122,7 +121,6 @@ impl WorkerPrompt {
            Self::WorkerOrchestrationGuidanceSection => {
                "internal.worker_orchestration_guidance_section"
            }
-            Self::TicketEventCompanionNotice => "worker.ticket_event_companion_notice",
            Self::SubWorkerSpawnToolDescription => "internal.sub_worker_spawn_tool_description",
        }
    }
@@ -139,13 +137,97 @@ impl WorkerPrompt {
        WorkerPrompt::AgentsMdSection,
        WorkerPrompt::ResidentMemorySummarySection,
        WorkerPrompt::WorkerOrchestrationGuidanceSection,
-        WorkerPrompt::TicketEventCompanionNotice,
        WorkerPrompt::SubWorkerSpawnToolDescription,
    ];
 }

+/// Model-visible queued Ticket projection shared by Server and TUI backlog attention paths.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+pub struct OrchestratorQueueAttentionTicket {
+    resource_key: String,
+    title: String,
+}
+
+impl OrchestratorQueueAttentionTicket {
+    pub fn new(
+        resource_key: impl Into<String>,
+        title: impl Into<String>,
+    ) -> Result<Self, CatalogError> {
+        let resource_key = resource_key.into();
+        if !is_ticket_resource_key(&resource_key) {
+            return Err(CatalogError::InvalidQueueAttentionResourceKey);
+        }
+        Ok(Self {
+            resource_key,
+            title: bounded_queue_attention_text(&title.into(), 240),
+        })
+    }
+}
+
+/// Shared model-visible context for every Orchestrator backlog attention renderer.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+pub struct OrchestratorQueueAttentionContext {
+    tickets: Vec<OrchestratorQueueAttentionTicket>,
+    separator: &'static str,
+    omitted_ticket_count: usize,
+}
+
+impl OrchestratorQueueAttentionContext {
+    pub const MAX_TICKETS: usize = 20;
+
+    pub fn new(tickets: Vec<OrchestratorQueueAttentionTicket>) -> Self {
+        let omitted_ticket_count = tickets.len().saturating_sub(Self::MAX_TICKETS);
+        Self {
+            tickets: tickets.into_iter().take(Self::MAX_TICKETS).collect(),
+            separator: "—",
+            omitted_ticket_count,
+        }
+    }
+}
+
+/// Prompt-catalog entries that must share the same backlog-attention body contract.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum OrchestratorQueueAttentionPrompt {
+    Server,
+    Tui,
+}
+
+impl OrchestratorQueueAttentionPrompt {
+    fn key(self) -> &'static str {
+        match self {
+            Self::Server => "internal.workspace_orchestrator_queue_attention",
+            Self::Tui => "panel.orchestrator_idle_queue_notice",
+        }
+    }
+}
+
+fn is_ticket_resource_key(input: &str) -> bool {
+    input.len() <= 32
+        && input.strip_prefix("T-").is_some_and(|suffix| {
+            !suffix.is_empty() && suffix.bytes().all(|byte| byte.is_ascii_digit())
+        })
+}
+
+fn bounded_queue_attention_text(input: &str, max_chars: usize) -> String {
+    let mut output = String::new();
+    for (index, character) in input.chars().enumerate() {
+        if index == max_chars {
+            output.push('…');
+            break;
+        }
+        output.push(if character.is_control() {
+            ' '
+        } else {
+            character
+        });
+    }
+    output
+}
+
 #[derive(Debug, Error)]
 pub enum CatalogError {
+    #[error("queued Ticket resource key is missing or invalid")]
+    InvalidQueueAttentionResourceKey,
    #[error("failed to build builtin Prompt source tree: {0}")]
    BuiltinTree(String),
    #[error("failed to evaluate builtin Prompt source tree: {0}")]
@@ -322,6 +404,14 @@ impl PromptCatalog {
        self.render_name(key, Value::from_serialize(context))
    }

+    pub fn orchestrator_queue_attention(
+        &self,
+        prompt: OrchestratorQueueAttentionPrompt,
+        context: &OrchestratorQueueAttentionContext,
+    ) -> Result<String, CatalogError> {
+        self.render_serializable(prompt.key(), context)
+    }
+
    pub fn render_name(&self, key: &str, ctx: Value) -> Result<String, CatalogError> {
        let template = self
            .env
@@ -593,6 +683,12 @@ mod tests {
    fn builtin_dcdl_catalog_loads() {
        let catalog = PromptCatalog::builtins_only().unwrap();
        assert!(!catalog.projection.templates.is_empty());
+        assert!(
+            !catalog
+                .projection
+                .templates
+                .contains_key("worker.ticket_event_companion_notice")
+        );
    }

    #[test]
@@ -609,6 +705,103 @@ mod tests {
        assert!(!prompt.contains("use the Ticket repository `origin` transport"));
    }

+    #[test]
+    fn merge_request_prompts_use_selector_refs_and_verb_first_operations() {
+        let catalog = PromptCatalog::builtins_only().unwrap();
+        let templates = &catalog.projection.templates;
+        let common = &templates["common.merge_request"];
+        let coder = &templates["role.coder"];
+        let orchestrator = &templates["role.orchestrator"];
+        let reviewer = &templates["role.reviewer"];
+        let combined = format!("{common}\n{coder}\n{orchestrator}\n{reviewer}");
+
+        for operation in [
+            "OpenMergeRequest",
+            "ShowMergeRequest",
+            "ReviewMergeRequest",
+            "CheckMergeRequestReadiness",
+            "CompleteMergeRequest",
+        ] {
+            assert!(combined.contains(operation), "missing {operation}");
+        }
+        for stale_operation in [
+            "MergeRequestOpen",
+            "MergeRequestShow",
+            "MergeRequestReview",
+            "MergeRequestReadinessCheck",
+            "MergeRequestComplete",
+            "MergeRequestAddRevision",
+        ] {
+            assert!(
+                !combined.contains(stale_operation),
+                "stale operation {stale_operation} remains in prompt authority"
+            );
+        }
+        assert!(common.contains("selector_from"));
+        assert!(common.contains("normal non-force push"));
+        assert!(common.contains("Moving only the target ref does not invalidate approval"));
+        assert!(common.contains("take precedence over stale Memory"));
+        assert!(coder.contains("Never invent an add-revision operation"));
+        assert!(orchestrator.contains("Target-only movement preserves source approval"));
+        assert!(reviewer.contains("target-only movement does not invalidate approval"));
+    }
+
+    #[test]
+    fn queue_attention_prompts_share_sanitized_contract_and_true_truncation() {
+        let catalog = PromptCatalog::builtins_only().unwrap();
+        let tickets = (1..=OrchestratorQueueAttentionContext::MAX_TICKETS + 1)
+            .map(|index| {
+                OrchestratorQueueAttentionTicket::new(
+                    format!("T-{index}"),
+                    format!("Ticket {index}\nwith control\u{7}"),
+                )
+                .unwrap()
+            })
+            .collect();
+        let context = OrchestratorQueueAttentionContext::new(tickets);
+        let server = catalog
+            .orchestrator_queue_attention(OrchestratorQueueAttentionPrompt::Server, &context)
+            .unwrap();
+        let tui = catalog
+            .orchestrator_queue_attention(OrchestratorQueueAttentionPrompt::Tui, &context)
+            .unwrap();
+
+        assert_eq!(server, tui);
+        assert!(server.starts_with("Queued Tickets require attention:"));
+        assert!(server.contains("- T-1 — Ticket 1 with control "));
+        assert!(!server.contains("T-21"));
+        assert!(server.contains("were omitted from this notice: 1"));
+        assert!(server.contains("Re-query current Ticket authority"));
+        assert!(server.contains("Reread the current Ticket state before acting"));
+        for secret in [
+            "workspace_id",
+            "Workspace:",
+            "runtime_id",
+            "worker_id",
+            "bounded",
+        ] {
+            assert!(!server.contains(secret), "leaked {secret}: {server}");
+        }
+    }
+
+    #[test]
+    fn queue_attention_prompt_omits_truncation_text_for_complete_list() {
+        let catalog = PromptCatalog::builtins_only().unwrap();
+        let context = OrchestratorQueueAttentionContext::new(vec![
+            OrchestratorQueueAttentionTicket::new("T-541", "Attention contract").unwrap(),
+        ]);
+        let rendered = catalog
+            .orchestrator_queue_attention(OrchestratorQueueAttentionPrompt::Server, &context)
+            .unwrap();
+
+        assert!(rendered.contains("- T-541 — Attention contract"));
+        assert!(!rendered.contains("omitted"));
+        assert!(matches!(
+            OrchestratorQueueAttentionTicket::new("opaque-id", "must fail"),
+            Err(CatalogError::InvalidQueueAttentionResourceKey)
+        ));
+    }
+
    #[test]
    fn graph_rejects_dynamic_legacy_missing_and_cycles() {
        let invalid = BTreeMap::from([
@@ -121,8 +121,11 @@ impl SegmentLogSink {
        matches!(
            entry,
            LogEntry::SegmentStart { .. }
+                | LogEntry::AnnotatedSegmentStart { .. }
                | LogEntry::UserInput { .. }
+                | LogEntry::AnnotatedUserInput { .. }
                | LogEntry::SystemItem { .. }
+                | LogEntry::AnnotatedSystemItem { .. }
                | LogEntry::Invoke { .. }
        )
    }
@@ -6,7 +6,8 @@

 use std::sync::Arc;

-use agen::{Item, Role};
+use crate::session_history::{SessionHistoryMetadata, WorkerHistoryProvenance};
+use agen::{HistoryEntry, Item, Role};
 use serde::{Deserialize, Serialize};

 const DEFAULT_SEARCH_LIMIT: usize = 20;
@@ -21,14 +22,21 @@ const OVERVIEW_ANCHOR_STRIDE: usize = 8;
 pub(crate) struct SessionEntryRef(String);

 impl SessionEntryRef {
-    pub(crate) fn new(source_index: usize) -> Self {
-        Self(format!("E{source_index:08}"))
+    pub(crate) fn from_history_entry_id(entry_id: &crate::SessionHistoryEntryId) -> Self {
+        Self(format!("E{}", entry_id.0))
    }

    pub(crate) fn parse(value: &str) -> Option<Self> {
-        let reference = Self(value.to_string());
-        reference.source_index()?;
-        Some(reference)
+        let suffix = value.strip_prefix('E')?;
+        if suffix.is_empty()
+            || suffix.len() > 64
+            || !suffix
+                .bytes()
+                .all(|byte| byte.is_ascii_alphanumeric() || byte == b'-')
+        {
+            return None;
+        }
+        Some(Self(value.to_string()))
    }

    pub(crate) fn as_str(&self) -> &str {
@@ -97,6 +105,7 @@ impl ToolPart {
 #[derive(Debug, Clone)]
 pub(crate) struct OverviewItem {
    pub id: SessionEntryRef,
+    pub origin: WorkerHistoryProvenance,
    pub entry_range: [u64; 2],
    pub kind: ReferenceKind,
    pub label: String,
@@ -107,6 +116,7 @@ pub(crate) struct OverviewItem {
 #[derive(Debug, Clone)]
 pub(crate) struct ReferenceEntry {
    pub id: SessionEntryRef,
+    pub origin: WorkerHistoryProvenance,
    pub entry_range: [u64; 2],
    pub kind: ReferenceKind,
    pub tool_part: Option<ToolPart>,
@@ -132,6 +142,7 @@ pub(crate) struct SearchOptions {
 #[derive(Debug, Clone)]
 pub(crate) struct SearchHit {
    pub id: SessionEntryRef,
+    pub origin: WorkerHistoryProvenance,
    pub kind: ReferenceKind,
    pub tool_part: Option<ToolPart>,
    pub tool_name: Option<String>,
@@ -143,6 +154,7 @@ pub(crate) struct SearchHit {
 #[derive(Debug, Clone, Copy)]
 pub(crate) enum ReadSelector<'a> {
    Id(&'a str),
+    #[cfg(test)]
    EntryRange([u64; 2]),
 }

@@ -176,6 +188,7 @@ impl Default for ReadOptions {
 #[derive(Debug, Clone)]
 pub(crate) struct ReadEntry {
    pub id: SessionEntryRef,
+    pub origin: WorkerHistoryProvenance,
    pub kind: ReferenceKind,
    pub tool_part: Option<ToolPart>,
    pub tool_name: Option<String>,
@@ -194,6 +207,7 @@ pub(crate) struct ReadResult {
 pub(crate) struct SessionEntryEvidence {
    pub segment_id: String,
    pub entry_ref: SessionEntryRef,
+    pub origin: WorkerHistoryProvenance,
    pub entry_range: [u64; 2],
    pub kind: ReferenceKind,
    pub tool_part: Option<ToolPart>,
@@ -205,26 +219,42 @@ pub(crate) struct SessionEntryEvidence {
 #[derive(Debug, Clone)]
 pub(crate) struct SessionCapture {
    segment_id: String,
-    items: Arc<Vec<Item>>,
+    entries: Arc<Vec<HistoryEntry<SessionHistoryMetadata>>>,
    overview: Vec<OverviewItem>,
    index: Vec<ReferenceEntry>,
 }

 impl SessionCapture {
    pub(crate) fn new(segment_id: impl Into<String>, items: Vec<Item>) -> Self {
+        let entries = items
+            .into_iter()
+            .enumerate()
+            .map(|(index, item)| {
+                let mut metadata = SessionHistoryMetadata::legacy_unknown();
+                metadata.entry_id =
+                    session_store::LoggedSessionHistoryEntryId(format!("{index:08}"));
+                HistoryEntry::new(item, metadata)
+            })
+            .collect();
+        Self::from_history_entries(segment_id, entries)
+    }
+
+    pub(crate) fn from_history_entries(
+        segment_id: impl Into<String>,
+        entries: Vec<HistoryEntry<SessionHistoryMetadata>>,
+    ) -> Self {
        let segment_id = segment_id.into();
-        let items = Arc::new(items);
+        let entries = Arc::new(entries);
        let mut overview = Vec::new();
        let mut index = Vec::new();

-        for (idx, item) in items.iter().enumerate() {
+        for (idx, entry) in entries.iter().enumerate() {
+            let item = &entry.item;
            let entry_range = [idx as u64, idx as u64];
            match item {
                Item::Message { role, content, .. } => {
-                    let kind = match role {
-                        Role::User => ReferenceKind::User,
-                        Role::Assistant => ReferenceKind::Assistant,
-                        Role::System => continue,
+                    let Some(kind) = message_reference_kind(&entry.annotation.origin, role) else {
+                        continue;
                    };
                    let text = content
                        .iter()
@@ -233,9 +263,10 @@ impl SessionCapture {
                        .join("");
                    let label = format!("{} message", kind.as_str());
                    let summary = truncate_chars(&text, 240);
-                    let id = SessionEntryRef::new(idx);
+                    let id = SessionEntryRef::from_history_entry_id(&entry.annotation.entry_id);
                    index.push(ReferenceEntry {
                        id: id.clone(),
+                        origin: entry.annotation.origin.clone(),
                        entry_range,
                        kind,
                        tool_part: None,
@@ -247,6 +278,7 @@ impl SessionCapture {
                    if matches!(kind, ReferenceKind::User | ReferenceKind::Assistant) {
                        overview.push(OverviewItem {
                            id: id.clone(),
+                            origin: entry.annotation.origin.clone(),
                            entry_range,
                            kind,
                            label,
@@ -260,7 +292,8 @@ impl SessionCapture {
                } => {
                    let text = format!("{name}\n{arguments}");
                    index.push(ReferenceEntry {
-                        id: SessionEntryRef::new(idx),
+                        id: SessionEntryRef::from_history_entry_id(&entry.annotation.entry_id),
+                        origin: entry.annotation.origin.clone(),
                        entry_range,
                        kind: ReferenceKind::Tool,
                        tool_part: Some(ToolPart::Input),
@@ -286,7 +319,8 @@ impl SessionCapture {
                        content.as_deref().unwrap_or_default(),
                    );
                    index.push(ReferenceEntry {
-                        id: SessionEntryRef::new(idx),
+                        id: SessionEntryRef::from_history_entry_id(&entry.annotation.entry_id),
+                        origin: entry.annotation.origin.clone(),
                        entry_range,
                        kind: ReferenceKind::Tool,
                        tool_part: Some(ToolPart::Output),
@@ -326,7 +360,7 @@ impl SessionCapture {

        Self {
            segment_id,
-            items,
+            entries,
            overview,
            index,
        }
@@ -336,6 +370,14 @@ impl SessionCapture {
        &self.overview
    }

+    pub(crate) fn source_index_for_ref(&self, reference: &SessionEntryRef) -> Option<u64> {
+        self.index
+            .iter()
+            .find(|entry| entry.id == *reference)
+            .map(|entry| entry.entry_range[0])
+            .or_else(|| reference.source_index())
+    }
+
    pub(crate) fn search(&self, options: &SearchOptions) -> Vec<SearchHit> {
        let query = options.query.trim().to_lowercase();
        let limit = options
@@ -346,12 +388,12 @@ impl SessionCapture {
        let min_entry_index = options
            .from
            .as_ref()
-            .and_then(SessionEntryRef::source_index)
+            .and_then(|reference| self.source_index_for_ref(reference))
            .unwrap_or_else(|| options.min_entry_index.unwrap_or(0));
        let max_entry_index = options
            .through
            .as_ref()
-            .and_then(SessionEntryRef::source_index)
+            .and_then(|reference| self.source_index_for_ref(reference))
            .unwrap_or(u64::MAX);
        let mut skipped = 0usize;
        let mut hits = Vec::new();
@@ -390,6 +432,7 @@ impl SessionCapture {
            }
            hits.push(SearchHit {
                id: entry.id.clone(),
+                origin: entry.origin.clone(),
                kind: entry.kind,
                tool_part: entry.tool_part,
                tool_name: entry.tool_name.clone(),
@@ -418,6 +461,7 @@ impl SessionCapture {
                .iter()
                .filter(|entry| entry.id.as_str() == id)
                .collect(),
+            #[cfg(test)]
            ReadSelector::EntryRange([start, end]) => self
                .index
                .iter()
@@ -440,13 +484,18 @@ impl SessionCapture {
                    }
                }
            }
-            let Some(item) = self.items.get(entry.entry_range[0] as usize) else {
+            let Some(item) = self
+                .entries
+                .get(entry.entry_range[0] as usize)
+                .map(|entry| &entry.item)
+            else {
                continue;
            };
            let text = render_item(item, entry, options.detail, max_bytes.saturating_sub(bytes));
            bytes = bytes.saturating_add(text.len());
            entries.push(ReadEntry {
                id: entry.id.clone(),
+                origin: entry.origin.clone(),
                kind: entry.kind,
                tool_part: entry.tool_part,
                tool_name: entry.tool_name.clone(),
@@ -483,6 +532,7 @@ impl SessionCapture {
        Some(SessionEntryEvidence {
            segment_id: self.segment_id.clone(),
            entry_ref: entry.id.clone(),
+            origin: entry.origin.clone(),
            entry_range: entry.entry_range,
            kind: entry.kind,
            tool_part: entry.tool_part,
@@ -493,6 +543,28 @@ impl SessionCapture {
    }
 }

+fn message_reference_kind(
+    origin: &WorkerHistoryProvenance,
+    provider_role: &Role,
+) -> Option<ReferenceKind> {
+    match origin {
+        WorkerHistoryProvenance::HumanInput { .. }
+        | WorkerHistoryProvenance::WorkerInput { .. } => Some(ReferenceKind::User),
+        WorkerHistoryProvenance::ModelOutput { .. } => Some(ReferenceKind::Assistant),
+        WorkerHistoryProvenance::ToolOutput { .. } => Some(ReferenceKind::Tool),
+        WorkerHistoryProvenance::LegacyUnknown => match provider_role {
+            Role::User => Some(ReferenceKind::User),
+            Role::Assistant => Some(ReferenceKind::Assistant),
+            Role::System => None,
+        },
+        // Flow/backend/system content remains out of the observation surface
+        // even when represented with a provider user/system role.
+        WorkerHistoryProvenance::FlowInstruction { .. }
+        | WorkerHistoryProvenance::BackendInstruction { .. }
+        | WorkerHistoryProvenance::DerivedSummary => None,
+    }
+}
+
 fn render_item(
    item: &Item,
    entry: &ReferenceEntry,
@@ -561,6 +633,60 @@ fn truncate_chars(text: &str, max_chars: usize) -> String {
 mod tests {
    use super::*;

+    #[test]
+    fn flow_user_role_is_excluded_while_explicit_human_origin_remains_evidence() {
+        let entries = vec![
+            crate::session_history::history_entry(
+                Item::user_message("trusted flow instruction"),
+                WorkerHistoryProvenance::FlowInstruction {
+                    selector: "builtin:coder-review".into(),
+                    definition_id: "coder-review".into(),
+                    definition_revision: 3,
+                    instance_id: "instance".into(),
+                    state_id: "implement".into(),
+                },
+            ),
+            crate::session_history::history_entry(
+                Item::user_message("remember my preference"),
+                WorkerHistoryProvenance::HumanInput {
+                    account_id: "account-1".into(),
+                },
+            ),
+        ];
+        let capture = SessionCapture::from_history_entries("segment", entries);
+        let overview = capture.overview();
+        assert_eq!(overview.len(), 1);
+        assert!(matches!(
+            overview[0].origin,
+            WorkerHistoryProvenance::HumanInput { .. }
+        ));
+        let evidence = capture.evidence_for(overview[0].id.as_str()).unwrap();
+        assert!(evidence.excerpt.ends_with("remember my preference"));
+        assert!(matches!(
+            evidence.origin,
+            WorkerHistoryProvenance::HumanInput { .. }
+        ));
+    }
+
+    #[test]
+    fn stable_logical_ref_survives_retention_and_restore_projection() {
+        let retained = crate::session_history::history_entry(
+            Item::assistant_message("retained"),
+            WorkerHistoryProvenance::ModelOutput {
+                worker: crate::session_history::worker_subject(Default::default()),
+            },
+        );
+        let expected_ref = SessionEntryRef::from_history_entry_id(&retained.annotation.entry_id);
+        let before = SessionCapture::from_history_entries("old", vec![retained.clone()]);
+        let after = SessionCapture::from_history_entries("new", vec![retained]);
+        assert_eq!(before.overview()[0].id, expected_ref);
+        assert_eq!(after.overview()[0].id, expected_ref);
+        assert_eq!(
+            after.evidence_for(expected_ref.as_str()).unwrap().entry_ref,
+            expected_ref
+        );
+    }
+
    #[test]
    fn overview_contains_user_and_assistant_only() {
        let view = SessionCapture::new(
@@ -0,0 +1,219 @@
+//! Restore-authoritative metadata for model-visible Worker history.
+//!
+//! Agen transports this annotation without interpreting it. Session Log v2
+//! stores each item and metadata in one typed record; legacy records are
+//! retained only as explicit `LegacyUnknown` entries.
+
+use agen::{HistoryEntry, Item};
+use protocol::Segment;
+use session_store::{
+    LogEntry, LoggedHistoryDerivation, LoggedHistoryEntry, LoggedSessionHistoryEntryId,
+    LoggedSessionHistoryMetadata, LoggedSessionHistoryOrigin, LoggedWorkerSubject, SegmentId,
+    SessionId,
+};
+
+pub type SessionHistoryEntryId = LoggedSessionHistoryEntryId;
+pub type SessionHistoryMetadata = LoggedSessionHistoryMetadata;
+pub type WorkerHistoryProvenance = LoggedSessionHistoryOrigin;
+pub type SessionHistoryDerivation = LoggedHistoryDerivation;
+pub type WorkerSubjectSnapshot = LoggedWorkerSubject;
+
+pub(crate) fn worker_subject(session_id: SessionId) -> WorkerSubjectSnapshot {
+    WorkerSubjectSnapshot {
+        workspace_id: None,
+        runtime_id: None,
+        worker_id: session_id.to_string(),
+    }
+}
+
+pub(crate) fn metadata(
+    origin: WorkerHistoryProvenance,
+    derivation: Option<SessionHistoryDerivation>,
+) -> SessionHistoryMetadata {
+    SessionHistoryMetadata {
+        entry_id: SessionHistoryEntryId::new(),
+        origin,
+        derivation,
+    }
+}
+
+pub(crate) fn history_entry(
+    item: Item,
+    origin: WorkerHistoryProvenance,
+) -> HistoryEntry<SessionHistoryMetadata> {
+    HistoryEntry::new(item, metadata(origin, None))
+}
+
+pub(crate) fn to_logged_history_entry(
+    entry: &HistoryEntry<SessionHistoryMetadata>,
+) -> LoggedHistoryEntry {
+    LoggedHistoryEntry {
+        item: entry.item.clone().into(),
+        metadata: entry.annotation.clone(),
+    }
+}
+
+fn legacy_entry(item: Item) -> HistoryEntry<SessionHistoryMetadata> {
+    HistoryEntry::new(item, SessionHistoryMetadata::legacy_unknown())
+}
+
+fn from_logged(entry: &LoggedHistoryEntry) -> HistoryEntry<SessionHistoryMetadata> {
+    HistoryEntry::new(Item::from(entry.item.clone()), entry.metadata.clone())
+}
+
+/// Rebuild typed Worker history directly from the append-only Session Log.
+/// Missing legacy metadata is never inferred from role or plaintext.
+pub(crate) fn restore_history_entries(
+    _session_id: SessionId,
+    _segment_id: SegmentId,
+    entries: &[LogEntry],
+) -> Result<Vec<HistoryEntry<SessionHistoryMetadata>>, String> {
+    let mut history = Vec::new();
+    for entry in entries {
+        match entry {
+            LogEntry::AnnotatedSegmentStart { history: seed, .. } => {
+                history = seed.iter().map(from_logged).collect();
+            }
+            LogEntry::SegmentStart { history: seed, .. } => {
+                history = seed
+                    .iter()
+                    .cloned()
+                    .map(Item::from)
+                    .map(legacy_entry)
+                    .collect();
+            }
+            LogEntry::AnnotatedUserInput { history: input, .. } => {
+                history.extend(input.iter().map(from_logged))
+            }
+            LogEntry::UserInput { segments, .. } => history.push(legacy_entry(Item::user_message(
+                Segment::flatten_to_text(segments),
+            ))),
+            LogEntry::AnnotatedAssistantItem { entry, .. }
+            | LogEntry::AnnotatedToolResult { entry, .. } => history.push(from_logged(entry)),
+            LogEntry::AssistantItem { item, .. } | LogEntry::ToolResult { item, .. } => {
+                history.push(legacy_entry(Item::from(item.clone())));
+            }
+            LogEntry::AnnotatedSystemItem { entry, .. } => history.push(HistoryEntry::new(
+                entry.item.to_history_item(),
+                entry.metadata.clone(),
+            )),
+            LogEntry::SystemItem { item, .. } => {
+                history.push(legacy_entry(item.to_history_item()));
+            }
+            _ => {}
+        }
+    }
+    Ok(history)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use agen::llm_client::RequestConfig;
+    use session_store::LogEntry;
+
+    #[test]
+    fn legacy_user_role_is_not_inferred_as_human_authority() {
+        let entries = vec![LogEntry::UserInput {
+            ts: 1,
+            segments: vec![Segment::text("legacy")],
+            extensions: Vec::new(),
+        }];
+        let restored =
+            restore_history_entries(SessionId::now_v7(), SegmentId::now_v7(), &entries).unwrap();
+        assert!(matches!(
+            restored[0].annotation.origin,
+            WorkerHistoryProvenance::LegacyUnknown
+        ));
+    }
+
+    #[test]
+    fn typed_flow_and_unknown_caller_input_round_trip_without_role_inference() {
+        let session_id = SessionId::now_v7();
+        let projected = vec![
+            history_entry(
+                Item::user_message("flow instructions"),
+                WorkerHistoryProvenance::FlowInstruction {
+                    selector: "builtin:coder-review".to_string(),
+                    definition_id: "coder-review".to_string(),
+                    definition_revision: 7,
+                    instance_id: "flow-instance".to_string(),
+                    state_id: "implement".to_string(),
+                },
+            ),
+            history_entry(
+                Item::user_message("implement"),
+                WorkerHistoryProvenance::LegacyUnknown,
+            ),
+        ];
+        let entries = vec![
+            LogEntry::AnnotatedSegmentStart {
+                ts: 0,
+                session_id,
+                system_prompt: None,
+                config: RequestConfig::default(),
+                history: Vec::new(),
+                forked_from: None,
+                compacted_from: None,
+            },
+            LogEntry::AnnotatedUserInput {
+                ts: 1,
+                segments: vec![
+                    Segment::Flow {
+                        selector: "builtin:coder-review".to_string(),
+                    },
+                    Segment::text("implement"),
+                ],
+                extensions: Vec::new(),
+                history: projected.iter().map(to_logged_history_entry).collect(),
+            },
+        ];
+        let restored = restore_history_entries(session_id, SegmentId::now_v7(), &entries).unwrap();
+        assert_eq!(restored, projected);
+    }
+
+    #[test]
+    fn annotated_restore_preserves_logical_ids_across_reboot() {
+        let session_id = SessionId::now_v7();
+        let entry = history_entry(
+            Item::assistant_message("persisted"),
+            WorkerHistoryProvenance::ModelOutput {
+                worker: worker_subject(session_id),
+            },
+        );
+        let log = vec![LogEntry::AnnotatedSegmentStart {
+            ts: 0,
+            session_id,
+            system_prompt: None,
+            config: RequestConfig::default(),
+            history: vec![to_logged_history_entry(&entry)],
+            forked_from: None,
+            compacted_from: None,
+        }];
+        let first = restore_history_entries(session_id, SegmentId::now_v7(), &log).unwrap();
+        let second = restore_history_entries(session_id, SegmentId::now_v7(), &log).unwrap();
+        assert_eq!(first[0].annotation.entry_id, entry.annotation.entry_id);
+        assert_eq!(second[0].annotation.entry_id, entry.annotation.entry_id);
+    }
+
+    #[test]
+    fn compacted_derivation_uses_stable_logical_entry_ids() {
+        let source = history_entry(
+            Item::user_message("source"),
+            WorkerHistoryProvenance::LegacyUnknown,
+        );
+        let summary = HistoryEntry::new(
+            Item::system_message("summary"),
+            metadata(
+                WorkerHistoryProvenance::DerivedSummary,
+                Some(SessionHistoryDerivation {
+                    sources: vec![source.annotation.entry_id.clone()],
+                }),
+            ),
+        );
+        assert_eq!(
+            summary.annotation.derivation.unwrap().sources,
+            vec![source.annotation.entry_id]
+        );
+    }
+}
@@ -1,7 +1,8 @@
-//! Parent-owned registry of direct Internal SubWorker sessions.
+//! Parent-owned registry of direct Internal Worker sessions.
 //!
-//! `SubWorkerSpawn` inserts typed `InternalWorkerSessionHandle`s; List/Send/Stop and
-//! worker-observation use the same in-memory authority. Internal children are not persisted, restored, discovered as
+//! `SubWorkerSpawn` inserts controllable SubWorker handles, while host services such as
+//! compaction insert parent-visible service handles without joining the model-facing
+//! List/Send/Stop surface. Internal children are not persisted, restored, discovered as
 //! Runtime Workers, or addressed through sockets. Restore consumes any legacy persisted process
 //! child records only to reclaim their delegated scope and clear obsolete metadata.
 //! Parent registry drop closes all session handles and synchronously returns delegated Write deny
@@ -177,6 +178,52 @@ impl InternalSpawnedWorkerRecord {
    }
 }

+/// Parent-visible service Internal Worker. Unlike a SubWorker this record has no
+/// delegated scope, model-facing control name, or stop-summary authority.
+#[derive(Clone)]
+pub(crate) struct InternalServiceWorkerRecord {
+    pub service_kind: String,
+    pub display_name: String,
+    pub session: InternalWorkerSessionHandle,
+    protocol_revision: Arc<AtomicU64>,
+    protocol_emit_lock: Arc<Mutex<()>>,
+    protocol_terminal: Arc<AtomicBool>,
+    forwarding_started: Arc<AtomicBool>,
+}
+
+impl InternalServiceWorkerRecord {
+    pub(crate) fn new(
+        service_kind: impl Into<String>,
+        display_name: impl Into<String>,
+        session: InternalWorkerSessionHandle,
+    ) -> Self {
+        Self {
+            service_kind: service_kind.into(),
+            display_name: display_name.into(),
+            session,
+            protocol_revision: Arc::new(AtomicU64::new(0)),
+            protocol_emit_lock: Arc::new(Mutex::new(())),
+            protocol_terminal: Arc::new(AtomicBool::new(false)),
+            forwarding_started: Arc::new(AtomicBool::new(false)),
+        }
+    }
+
+    fn protocol_ref(&self, parent_session_id: Option<String>) -> InternalWorkerRef {
+        InternalWorkerRef {
+            session_id: self.session.session_id_string(),
+            name: self.display_name.clone(),
+            parent_session_id,
+            kind: InternalWorkerKind::Service {
+                kind: self.service_kind.clone(),
+            },
+        }
+    }
+
+    fn protocol_revision(&self) -> u64 {
+        self.protocol_revision.load(Ordering::Acquire)
+    }
+}
+
 pub(crate) struct InternalSpawnReservation {
    registry: Arc<SpawnedWorkerRegistry>,
    worker_name: String,
@@ -214,6 +261,7 @@ impl Drop for InternalSpawnReservation {

 pub struct SpawnedWorkerRegistry {
    internal_records: std::sync::Mutex<Vec<InternalSpawnedWorkerRecord>>,
+    service_records: std::sync::Mutex<Vec<InternalServiceWorkerRecord>>,
    internal_names: std::sync::Mutex<HashSet<String>>,
    parent_scope: Option<SharedScope>,
    parent_protocol: Mutex<Option<(broadcast::Sender<Event>, String)>>,
@@ -226,10 +274,21 @@ pub struct SpawnedWorkerRegistryLoad {
 }

 impl SpawnedWorkerRegistry {
+    pub(crate) fn new_for_internal_services() -> Arc<Self> {
+        Arc::new(Self {
+            internal_records: std::sync::Mutex::new(Vec::new()),
+            service_records: std::sync::Mutex::new(Vec::new()),
+            internal_names: std::sync::Mutex::new(HashSet::new()),
+            parent_scope: None,
+            parent_protocol: Mutex::new(None),
+        })
+    }
+
    /// Empty registry used by tests and non-spawning projections.
    pub fn new(_runtime_dir: Arc<RuntimeDir>) -> Arc<Self> {
        Arc::new(Self {
            internal_records: std::sync::Mutex::new(Vec::new()),
+            service_records: std::sync::Mutex::new(Vec::new()),
            internal_names: std::sync::Mutex::new(HashSet::new()),
            parent_scope: None,
            parent_protocol: Mutex::new(None),
@@ -239,6 +298,7 @@ impl SpawnedWorkerRegistry {
    pub(crate) fn new_internal(_parent_name: String, parent_scope: SharedScope) -> Arc<Self> {
        Arc::new(Self {
            internal_records: std::sync::Mutex::new(Vec::new()),
+            service_records: std::sync::Mutex::new(Vec::new()),
            internal_names: std::sync::Mutex::new(HashSet::new()),
            parent_scope: Some(parent_scope),
            parent_protocol: Mutex::new(None),
@@ -317,6 +377,7 @@ impl SpawnedWorkerRegistry {
        Ok(SpawnedWorkerRegistryLoad {
            registry: Arc::new(Self {
                internal_records: std::sync::Mutex::new(Vec::new()),
+                service_records: std::sync::Mutex::new(Vec::new()),
                internal_names: std::sync::Mutex::new(HashSet::new()),
                parent_scope,
                parent_protocol: Mutex::new(None),
@@ -356,6 +417,144 @@ impl SpawnedWorkerRegistry {
        for record in self.internal_records.lock().unwrap().clone() {
            self.start_protocol_forwarding(record);
        }
+        for record in self.service_records.lock().unwrap().clone() {
+            self.start_service_protocol_forwarding(record);
+        }
+    }
+
+    /// Register a parent-visible service Internal Worker before its first turn.
+    pub(crate) fn attach_service(
+        &self,
+        record: InternalServiceWorkerRecord,
+    ) -> io::Result<InternalWorkerRef> {
+        let parent_session_id = self
+            .parent_protocol
+            .lock()
+            .unwrap()
+            .as_ref()
+            .map(|(_, id)| id.clone());
+        let worker_ref = record.protocol_ref(parent_session_id);
+        let session_id = record.session.session_id_string();
+        let mut records = self
+            .service_records
+            .lock()
+            .map_err(|_| io::Error::other("internal service-worker registry lock poisoned"))?;
+        if records
+            .iter()
+            .any(|candidate| candidate.session.session_id_string() == session_id)
+        {
+            return Err(io::Error::new(
+                io::ErrorKind::AlreadyExists,
+                "internal service Worker is already registered",
+            ));
+        }
+        records.push(record.clone());
+        drop(records);
+        self.start_service_protocol_forwarding(record);
+        Ok(worker_ref)
+    }
+
+    /// Stop and remove one parent-owned service Worker. This is host-only and is
+    /// intentionally separate from the SubWorker control surface.
+    pub(crate) async fn stop_service(&self, session_id: &str) -> io::Result<bool> {
+        let record = self
+            .service_records
+            .lock()
+            .map_err(|_| io::Error::other("internal service-worker registry lock poisoned"))?
+            .iter()
+            .find(|record| record.session.session_id_string() == session_id)
+            .cloned();
+        let Some(record) = record else {
+            return Ok(false);
+        };
+        record
+            .session
+            .stop()
+            .await
+            .map_err(|error| io::Error::other(error.to_string()))?;
+        self.remove_service(session_id)
+    }
+
+    /// Remove one service Worker and emit the terminal projection fence.
+    pub(crate) fn remove_service(&self, session_id: &str) -> io::Result<bool> {
+        let removed = {
+            let mut records = self
+                .service_records
+                .lock()
+                .map_err(|_| io::Error::other("internal service-worker registry lock poisoned"))?;
+            records
+                .iter()
+                .position(|record| record.session.session_id_string() == session_id)
+                .map(|index| records.remove(index))
+        };
+        if let Some(record) = removed {
+            self.publish_service_removal(&record);
+            Ok(true)
+        } else {
+            Ok(false)
+        }
+    }
+
+    fn start_service_protocol_forwarding(&self, record: InternalServiceWorkerRecord) {
+        if record.session.visibility() != InternalWorkerVisibility::ParentClient
+            || record.forwarding_started.swap(true, Ordering::AcqRel)
+        {
+            return;
+        }
+        let Some((parent_tx, parent_session_id)) = self.parent_protocol.lock().unwrap().clone()
+        else {
+            record.forwarding_started.store(false, Ordering::Release);
+            return;
+        };
+        let worker = record.protocol_ref(Some(parent_session_id));
+        let protocol_revision = record.protocol_revision.clone();
+        let protocol_emit_lock = record.protocol_emit_lock.clone();
+        let protocol_terminal = record.protocol_terminal.clone();
+        let mut child_rx = record.session.subscribe_events();
+        tokio::spawn(async move {
+            loop {
+                match child_rx.recv().await {
+                    Ok(event) => {
+                        let shutdown = matches!(event, Event::Shutdown);
+                        let _emit_guard = protocol_emit_lock
+                            .lock()
+                            .unwrap_or_else(|error| error.into_inner());
+                        if protocol_terminal.load(Ordering::Acquire) {
+                            break;
+                        }
+                        let revision = protocol_revision.fetch_add(1, Ordering::AcqRel) + 1;
+                        let _ = parent_tx.send(Event::InternalWorker {
+                            worker: worker.clone(),
+                            revision,
+                            event: Box::new(event),
+                        });
+                        if shutdown {
+                            break;
+                        }
+                    }
+                    Err(broadcast::error::RecvError::Lagged(skipped)) => {
+                        let _emit_guard = protocol_emit_lock
+                            .lock()
+                            .unwrap_or_else(|error| error.into_inner());
+                        if protocol_terminal.load(Ordering::Acquire) {
+                            break;
+                        }
+                        let revision = protocol_revision.fetch_add(1, Ordering::AcqRel) + 1;
+                        let _ = parent_tx.send(Event::InternalWorker {
+                            worker: worker.clone(),
+                            revision,
+                            event: Box::new(Event::Error {
+                                code: protocol::ErrorCode::Internal,
+                                message: format!(
+                                    "internal Worker output lagged by {skipped} events; reconnect to resynchronize"
+                                ),
+                            }),
+                        });
+                    }
+                    Err(broadcast::error::RecvError::Closed) => break,
+                }
+            }
+        });
    }

    fn start_protocol_forwarding(&self, record: InternalSpawnedWorkerRecord) {
@@ -427,28 +626,37 @@ impl SpawnedWorkerRegistry {
            .unwrap()
            .as_ref()
            .map(|(_, id)| id.clone());
-        self.internal_records
+        let mut snapshots = self
+            .internal_records
            .lock()
            .unwrap()
            .iter()
            .filter(|record| record.session.visibility() == InternalWorkerVisibility::ParentClient)
            .map(|record| {
-                let snapshot = record.session.protocol_snapshot();
-                InternalWorkerSnapshot {
-                    worker: record.protocol_ref(parent_session_id.clone()),
-                    revision: record.protocol_revision(),
-                    entries: snapshot
-                        .entries
-                        .into_iter()
-                        .filter_map(|entry| serde_json::to_value(entry).ok())
-                        .collect(),
-                    status: snapshot.status,
-                    error: snapshot.error,
-                    in_flight: snapshot.in_flight,
-                    internal_workers: snapshot.internal_workers,
-                }
+                internal_worker_snapshot(
+                    record.protocol_ref(parent_session_id.clone()),
+                    record.protocol_revision(),
+                    &record.session,
+                )
            })
-            .collect()
+            .collect::<Vec<_>>();
+        snapshots.extend(
+            self.service_records
+                .lock()
+                .unwrap()
+                .iter()
+                .filter(|record| {
+                    record.session.visibility() == InternalWorkerVisibility::ParentClient
+                })
+                .map(|record| {
+                    internal_worker_snapshot(
+                        record.protocol_ref(parent_session_id.clone()),
+                        record.protocol_revision(),
+                        &record.session,
+                    )
+                }),
+        );
+        snapshots
    }

    pub(crate) fn get_internal(&self, worker_name: &str) -> Option<InternalSpawnedWorkerRecord> {
@@ -567,6 +775,47 @@ impl SpawnedWorkerRegistry {
            revision,
        });
    }
+
+    fn publish_service_removal(&self, record: &InternalServiceWorkerRecord) {
+        if record.session.visibility() != InternalWorkerVisibility::ParentClient {
+            return;
+        }
+        let Some((parent_tx, parent_session_id)) = self.parent_protocol.lock().unwrap().clone()
+        else {
+            return;
+        };
+        let _emit_guard = record
+            .protocol_emit_lock
+            .lock()
+            .unwrap_or_else(|error| error.into_inner());
+        record.protocol_terminal.store(true, Ordering::Release);
+        let revision = record.protocol_revision.fetch_add(1, Ordering::AcqRel) + 1;
+        let _ = parent_tx.send(Event::InternalWorkerRemoved {
+            worker: record.protocol_ref(Some(parent_session_id)),
+            revision,
+        });
+    }
+}
+
+fn internal_worker_snapshot(
+    worker: InternalWorkerRef,
+    revision: u64,
+    session: &InternalWorkerSessionHandle,
+) -> InternalWorkerSnapshot {
+    let snapshot = session.protocol_snapshot();
+    InternalWorkerSnapshot {
+        worker,
+        revision,
+        entries: snapshot
+            .entries
+            .into_iter()
+            .filter_map(|entry| serde_json::to_value(entry).ok())
+            .collect(),
+        status: snapshot.status,
+        error: snapshot.error,
+        in_flight: snapshot.in_flight,
+        internal_workers: snapshot.internal_workers,
+    }
 }

 impl Drop for SpawnedWorkerRegistry {
@@ -813,6 +1062,63 @@ mod tests {
        assert_eq!(snapshots[0].in_flight.blocks.len(), 1);
    }

+    #[tokio::test]
+    async fn service_worker_is_parent_visible_but_not_subworker_controllable() {
+        let registry = registry();
+        let (parent_tx, mut parent_rx) = broadcast::channel(16);
+        registry.attach_parent_protocol(parent_tx, "parent-session".into());
+        let (session, child_tx) =
+            test_internal_worker_session(InternalWorkerVisibility::ParentClient);
+        let session_id = session.session_id_string();
+
+        let worker_ref = registry
+            .attach_service(InternalServiceWorkerRecord::new(
+                "compaction",
+                "Compaction",
+                session,
+            ))
+            .unwrap();
+        assert!(matches!(
+            worker_ref.kind,
+            InternalWorkerKind::Service { ref kind } if kind == "compaction"
+        ));
+        assert!(registry.list_internal().is_empty());
+
+        child_tx
+            .send(Event::TextDone {
+                text: "summary candidate".into(),
+            })
+            .unwrap();
+        let event = tokio::time::timeout(Duration::from_secs(1), parent_rx.recv())
+            .await
+            .unwrap()
+            .unwrap();
+        assert!(matches!(
+            event,
+            Event::InternalWorker { worker, revision: 1, event }
+                if worker.session_id == session_id
+                    && matches!(worker.kind, InternalWorkerKind::Service { ref kind } if kind == "compaction")
+                    && matches!(*event, Event::TextDone { ref text } if text == "summary candidate")
+        ));
+        let snapshots = registry.internal_worker_snapshots();
+        assert_eq!(snapshots.len(), 1);
+        assert!(matches!(
+            snapshots[0].worker.kind,
+            InternalWorkerKind::Service { ref kind } if kind == "compaction"
+        ));
+        assert!(registry.remove_service(&session_id).unwrap());
+        let removed = tokio::time::timeout(Duration::from_secs(1), parent_rx.recv())
+            .await
+            .unwrap()
+            .unwrap();
+        assert!(matches!(
+            removed,
+            Event::InternalWorkerRemoved { worker, revision: 2 }
+                if worker.session_id == session_id
+        ));
+        assert!(registry.internal_worker_snapshots().is_empty());
+    }
+
    #[tokio::test]
    async fn service_private_internal_output_is_never_disclosed() {
        let registry = registry();
@@ -499,7 +499,10 @@ impl Tool for SubWorkerSpawnTool {
            InternalWorkerVisibility::ParentClient,
            Some(child_registry.clone()),
            Some(Arc::new(move |status| {
-                if status == InternalWorkerSessionStatus::Failed {
+                if matches!(
+                    status,
+                    InternalWorkerSessionStatus::Failed | InternalWorkerSessionStatus::Stopped
+                ) {
                    if let Some(registry) = registry.upgrade() {
                        if let Err(error) = registry.reclaim_internal_scope(&child_name) {
                            tracing::warn!(
@@ -1249,7 +1252,7 @@ extract_threshold = 4000
        )
        .await
        .unwrap();
-        assert!(first_capture.items.iter().any(|item| {
+        assert!(first_capture.entries.iter().map(|entry| &entry.item).any(|item| {
            matches!(item, Item::Message { role: Role::Assistant, content, .. } if content.iter().any(|part| matches!(part, ContentPart::Text { text } if text.contains("reviewed"))))
        }));

@@ -1271,7 +1274,7 @@ extract_threshold = 4000
        )
        .await
        .unwrap();
-        assert!(latest_capture.items.len() > first_capture.items.len());
+        assert!(latest_capture.entries.len() > first_capture.entries.len());

        fail_requests.store(true, Ordering::SeqCst);
        send.execute(
@@ -1282,16 +1285,16 @@ extract_threshold = 4000
        .unwrap();
        assert_eq!(
            record.session.wait_until_idle().await,
-            InternalWorkerSessionStatus::Failed
+            InternalWorkerSessionStatus::Stopped
        );
        assert_eq!(calls.load(Ordering::SeqCst), 3);
        assert!(
            spawner_scope.snapshot().is_writable(&workspace_root),
-            "Failed terminal child must release its delegated Workdir session"
+            "Stopped terminal child must release its delegated Workdir session"
        );
        assert!(
            !record.workdir_delegation.is_active(),
-            "failed child must revoke cloned scoped sessions"
+            "stopped child must revoke cloned scoped sessions"
        );
        assert!(registry.get_internal("reviewer-child").is_some());

@@ -163,7 +163,8 @@ async fn make_worker_with_manifest(
    let scope = worker::Scope::writable(&pwd).unwrap();
    std::mem::forget(pwd_tmp);

-    let worker = Engine::new(client);
+    let worker =
+        Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(client);
    let mut worker = Worker::new(
        manifest,
        worker,
@@ -204,28 +205,34 @@ fn system_texts_in_sink_session_start(
 ) -> Vec<String> {
    let (entries, _rx) = worker.sink().subscribe_with_snapshot();
    for entry in entries.into_iter().rev() {
-        if let session_store::LogEntry::SegmentStart { history, .. } = entry {
-            return history
+        let history = match entry {
+            session_store::LogEntry::AnnotatedSegmentStart { history, .. } => history
                .into_iter()
-                .filter_map(|logged| {
-                    let item: Item = logged.into();
-                    match item {
-                        Item::Message {
-                            role: agen::Role::System,
-                            content,
-                            ..
-                        } => Some(
-                            content
-                                .iter()
-                                .map(|p| p.as_text().to_owned())
-                                .collect::<Vec<_>>()
-                                .join(""),
-                        ),
-                        _ => None,
-                    }
-                })
-                .collect();
-        }
+                .map(|entry| entry.item)
+                .collect::<Vec<_>>(),
+            session_store::LogEntry::SegmentStart { history, .. } => history,
+            _ => continue,
+        };
+        return history
+            .into_iter()
+            .filter_map(|logged| {
+                let item: Item = logged.into();
+                match item {
+                    Item::Message {
+                        role: agen::Role::System,
+                        content,
+                        ..
+                    } => Some(
+                        content
+                            .iter()
+                            .map(|p| p.as_text().to_owned())
+                            .collect::<Vec<_>>()
+                            .join(""),
+                    ),
+                    _ => None,
+                }
+            })
+            .collect();
    }
    Vec::new()
 }
@@ -337,7 +344,12 @@ permission = "write"
    // New segment records forked_from pointing at the source.
    let new_entries = store.read_all(session_id, new_segment_id).unwrap();
    match &new_entries[0] {
-        LogEntry::SegmentStart {
+        LogEntry::AnnotatedSegmentStart {
+            session_id: seg_session,
+            forked_from: Some(origin),
+            ..
+        }
+        | LogEntry::SegmentStart {
            session_id: seg_session,
            forked_from: Some(origin),
            ..
@@ -431,7 +443,7 @@ async fn pre_run_compact_success_broadcasts_start_and_done() {
    let kinds: Vec<&str> = events
        .iter()
        .map(|e| match e {
-            Event::CompactStart => "start",
+            Event::CompactStart { .. } => "start",
            Event::CompactDone { .. } => "done",
            Event::CompactFailed { .. } => "failed",
            _ => "other",
@@ -445,10 +457,61 @@ async fn pre_run_compact_success_broadcasts_start_and_done() {
        !kinds.contains(&"failed"),
        "unexpected CompactFailed in {kinds:?}"
    );
+    let starts = events
+        .iter()
+        .filter_map(|event| match event {
+            Event::CompactStart { lifecycle } => Some(lifecycle),
+            _ => None,
+        })
+        .collect::<Vec<_>>();
+    assert_eq!(
+        starts.len(),
+        2,
+        "start and Internal Worker binding revisions"
+    );
+    assert_eq!(starts[0].compaction_id, starts[1].compaction_id);
+    assert_eq!(starts[0].revision, 1);
+    assert!(starts[0].internal_worker.is_none());
+    assert_eq!(starts[1].revision, 2);
+    assert!(matches!(
+        starts[1].internal_worker.as_ref().map(|worker| &worker.kind),
+        Some(protocol::InternalWorkerKind::Service { kind }) if kind == "compaction"
+    ));
+    assert!(events.iter().any(|event| matches!(
+        event,
+        Event::InternalWorker { worker, .. }
+            if matches!(&worker.kind, protocol::InternalWorkerKind::Service { kind } if kind == "compaction")
+    )), "compactor activity must be projected through the parent stream");
+    let completed = events
+        .iter()
+        .find_map(|event| match event {
+            Event::CompactDone { lifecycle } => Some(lifecycle),
+            _ => None,
+        })
+        .expect("completed lifecycle");
+    assert_eq!(completed.compaction_id, starts[0].compaction_id);
+    assert_eq!(completed.revision, 3);
+    assert_eq!(completed.summary.as_deref(), Some("summary"));
+    assert_eq!(completed.state, protocol::CompactionLifecycleState::Done);
+    let done_index = events
+        .iter()
+        .position(|event| matches!(event, Event::CompactDone { .. }))
+        .expect("done event");
+    let removed_index = events
+        .iter()
+        .position(|event| matches!(event, Event::InternalWorkerRemoved { .. }))
+        .expect("terminal compactor session must be released");
+    assert!(
+        done_index < removed_index,
+        "terminal lifecycle precedes release fence"
+    );

    // CompactDone carries the new Segment ID; the Session ID is unchanged.
    let new_id_in_event = events.iter().find_map(|e| match e {
-        Event::CompactDone { new_segment_id } => Some(*new_segment_id),
+        Event::CompactDone { lifecycle } => lifecycle
+            .new_segment_id
+            .as_deref()
+            .and_then(|value| uuid::Uuid::parse_str(value).ok()),
        _ => None,
    });
    assert!(new_id_in_event.is_some(), "CompactDone missing");
@@ -488,7 +551,7 @@ async fn mid_turn_compact_success_broadcasts_start_and_done() {
    let kinds: Vec<&str> = events
        .iter()
        .map(|e| match e {
-            Event::CompactStart => "start",
+            Event::CompactStart { .. } => "start",
            Event::CompactDone { .. } => "done",
            Event::CompactFailed { .. } => "failed",
            _ => "other",
@@ -504,7 +567,10 @@ async fn mid_turn_compact_success_broadcasts_start_and_done() {
    );

    let new_id_in_event = events.iter().find_map(|e| match e {
-        Event::CompactDone { new_segment_id } => Some(*new_segment_id),
+        Event::CompactDone { lifecycle } => lifecycle
+            .new_segment_id
+            .as_deref()
+            .and_then(|value| uuid::Uuid::parse_str(value).ok()),
        _ => None,
    });
    assert_eq!(new_id_in_event, Some(worker.segment_id()));
@@ -662,7 +728,7 @@ async fn pre_run_compact_failure_broadcasts_start_and_failed() {
    let kinds: Vec<&str> = events
        .iter()
        .map(|e| match e {
-            Event::CompactStart => "start",
+            Event::CompactStart { .. } => "start",
            Event::CompactDone { .. } => "done",
            Event::CompactFailed { .. } => "failed",
            _ => "other",
@@ -823,11 +889,14 @@ async fn controller_compact_method_emits_start_and_done() {
            .expect("timeout waiting for compact events")
            .expect("event")
        {
-            Event::CompactStart => saw_start = true,
+            Event::CompactStart { .. } => saw_start = true,
            Event::CompactDone { .. } => {
                break;
            }
-            Event::CompactFailed { error } => panic!("manual compact failed: {error}"),
+            Event::CompactFailed { lifecycle } => panic!(
+                "manual compact failed: {}",
+                lifecycle.error.as_deref().unwrap_or("unknown error")
+            ),
            _ => {}
        }
    }
@@ -32,16 +32,29 @@ fn history_from_sink(handle: &WorkerHandle) -> Vec<Item> {
    let mut items = Vec::new();
    for entry in entries {
        match entry {
+            LogEntry::AnnotatedSegmentStart { history, .. } => {
+                items.extend(history.into_iter().map(|entry| Item::from(entry.item)));
+            }
            LogEntry::SegmentStart { history, .. } => {
                items.extend(history.into_iter().map(Item::from));
            }
+            LogEntry::AnnotatedUserInput { history, .. } => {
+                items.extend(history.into_iter().map(|entry| Item::from(entry.item)));
+            }
            LogEntry::UserInput { segments, .. } => {
                let text = protocol::Segment::flatten_to_text(&segments);
                items.push(Item::user_message(text));
            }
+            LogEntry::AnnotatedAssistantItem { entry, .. }
+            | LogEntry::AnnotatedToolResult { entry, .. } => {
+                items.push(Item::from(entry.item));
+            }
            LogEntry::AssistantItem { item, .. } | LogEntry::ToolResult { item, .. } => {
                items.push(Item::from(item));
            }
+            LogEntry::AnnotatedSystemItem { entry, .. } => {
+                items.push(entry.item.to_history_item());
+            }
            LogEntry::SystemItem { item, .. } => {
                items.push(item.to_history_item());
            }
@@ -51,6 +64,14 @@ fn history_from_sink(handle: &WorkerHandle) -> Vec<Item> {
    items
 }

+fn system_item(entry: &LogEntry) -> Option<&session_store::SystemItem> {
+    match entry {
+        LogEntry::AnnotatedSystemItem { entry, .. } => Some(&entry.item),
+        LogEntry::SystemItem { item, .. } => Some(item),
+        _ => None,
+    }
+}
+
 // ---------------------------------------------------------------------------
 // Mock LLM Client
 // ---------------------------------------------------------------------------
@@ -192,7 +213,8 @@ async fn make_worker_with_pwd_and_manifest(
    let scope = manifest::Scope::writable(&pwd).unwrap();
    std::mem::forget(pwd_tmp);

-    let worker = Engine::new(client);
+    let worker =
+        Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(client);
    let authority = WorkerFilesystemAuthority::local(pwd.clone(), pwd.clone());
    let worker = Worker::new(
        manifest,
@@ -784,13 +806,30 @@ async fn snapshot_includes_user_input_for_in_flight_turn() {
    let client = MockClient::sequential(vec![MockResponse::Hang(simple_text_events())]);
    let worker = make_worker(client).await;
    let handle = spawn_controller(worker).await;
+    let mut events = handle.subscribe();

    handle
        .send(Method::run_text("hello in-flight"))
        .await
        .unwrap();
-    wait_for_status(&handle, WorkerStatus::Running).await;
+    tokio::time::timeout(std::time::Duration::from_secs(2), async {
+        loop {
+            if matches!(
+                events.recv().await,
+                Ok(Event::Status {
+                    status: WorkerStatus::Running,
+                })
+            ) {
+                break;
+            }
+        }
+    })
+    .await
+    .expect("running status event");

+    // The Running event is the in-flight visibility fence: the committed
+    // annotated input must already be available to an immediately attaching
+    // subscriber rather than racing behind this status transition.
    let stream = tokio::net::UnixStream::connect(handle.runtime_dir.socket_path())
        .await
        .unwrap();
@@ -804,10 +843,12 @@ async fn snapshot_includes_user_input_for_in_flight_turn() {
                // Walk the entries, find a `LogEntry::UserInput` and
                // confirm its segments flatten to our submitted text.
                let mut found = false;
-                for value in entries {
+                for value in &entries {
                    let entry: session_store::LogEntry =
-                        serde_json::from_value(value).expect("LogEntry deserialise");
-                    if let session_store::LogEntry::UserInput { segments, .. } = entry {
+                        serde_json::from_value(value.clone()).expect("LogEntry deserialise");
+                    if let session_store::LogEntry::UserInput { segments, .. }
+                    | session_store::LogEntry::AnnotatedUserInput { segments, .. } = entry
+                    {
                        let text = protocol::Segment::flatten_to_text(&segments);
                        if text == "hello in-flight" {
                            found = true;
@@ -815,7 +856,10 @@ async fn snapshot_includes_user_input_for_in_flight_turn() {
                        }
                    }
                }
-                assert!(found, "snapshot must carry the in-flight UserInput entry");
+                assert!(
+                    found,
+                    "snapshot must carry the in-flight UserInput entry: {entries:?}"
+                );
                return;
            }
            Event::Alert(_) => continue,
@@ -1086,7 +1130,7 @@ async fn run_with_paste_segment_inlines_content_and_emits_typed_user_message() {
                _ => {}
            },
            entry = entry_rx.recv() => match entry {
-                Ok(session_store::LogEntry::UserInput { segments, .. }) => {
+                Ok(session_store::LogEntry::UserInput { segments, .. } | session_store::LogEntry::AnnotatedUserInput { segments, .. }) => {
                    user_input_segments = Some(segments);
                    if saw_turn_end {
                        break;
@@ -1317,11 +1361,8 @@ async fn notify_while_idle_auto_starts_turn_and_injects_system_message() {
    let (entries, _) = handle.sink.subscribe_with_snapshot();
    let saw_notify_in_mirror = entries.iter().any(|e| {
        matches!(
-            e,
-            session_store::LogEntry::SystemItem {
-                item: session_store::SystemItem::Notification { message, .. },
-                ..
-            } if message == "turn finished"
+            system_item(e),
+            Some(session_store::SystemItem::Notification { message, .. }) if message == "turn finished"
        )
    });
    assert!(
@@ -1463,14 +1504,11 @@ async fn worker_event_turn_ended_while_idle_auto_starts_turn_and_injects_system_
    let (entries, _) = handle.sink.subscribe_with_snapshot();
    let saw_worker_event_in_mirror = entries.iter().any(|e| {
        matches!(
-            e,
-            session_store::LogEntry::SystemItem {
-                item: session_store::SystemItem::WorkerEvent {
-                    event: protocol::WorkerEvent::TurnEnded { worker_name },
-                    ..
-                },
+            system_item(e),
+            Some(session_store::SystemItem::WorkerEvent {
+                event: protocol::WorkerEvent::TurnEnded { worker_name },
                ..
-            } if worker_name == "child"
+            }) if worker_name == "child"
        )
    });
    assert!(
@@ -1552,14 +1590,11 @@ async fn worker_event_scope_sub_delegated_while_idle_stays_control_plane_only()
    let (entries, _) = handle.sink.subscribe_with_snapshot();
    let saw_scope_event_in_mirror = entries.iter().any(|entry| {
        matches!(
-            entry,
-            session_store::LogEntry::SystemItem {
-                item: session_store::SystemItem::WorkerEvent {
-                    event: protocol::WorkerEvent::ScopeSubDelegated { .. },
-                    ..
-                },
+            system_item(entry),
+            Some(session_store::SystemItem::WorkerEvent {
+                event: protocol::WorkerEvent::ScopeSubDelegated { .. },
                ..
-            }
+            })
        )
    });
    assert!(
@@ -2134,9 +2169,13 @@ async fn paused_then_run_closes_orphan_tool_use_for_next_request() {
    for item in items {
        match item {
            agen::Item::ToolResult {
-                call_id, summary, ..
+                call_id,
+                summary,
+                disposition,
+                ..
            } if call_id == "call_orphan" => {
-                assert_eq!(summary, "[Interrupted by user]");
+                assert_eq!(summary, "Tool execution outcome unknown");
+                assert_eq!(*disposition, agen::ToolResultDisposition::OutcomeUnknown);
                saw_synthetic_tool_result = true;
            }
            agen::Item::Message { role, content, .. } if *role == agen::Role::System => {
@@ -2327,8 +2366,11 @@ async fn paused_cancel_abandons_resume_and_next_input_is_fresh_run() {
    assert!(
        items.iter().any(|item| matches!(
            item,
-            agen::Item::ToolResult { call_id, summary, .. }
-                if call_id == "call_cancelled" && summary == "[Interrupted by user]"
+            agen::Item::ToolResult {
+                call_id,
+                disposition: agen::ToolResultDisposition::OutcomeUnknown,
+                ..
+            } if call_id == "call_cancelled"
        )),
        "paused cancel should close orphan tool_use before future requests: {items:?}"
    );
@@ -2373,7 +2415,8 @@ async fn snapshot_contains_user_input(handle: &WorkerHandle, needle: &str) -> bo
                    let entry: session_store::LogEntry =
                        serde_json::from_value(value).expect("LogEntry deserialise");
                    match entry {
-                        session_store::LogEntry::UserInput { segments, .. } => {
+                        session_store::LogEntry::UserInput { segments, .. }
+                        | session_store::LogEntry::AnnotatedUserInput { segments, .. } => {
                            protocol::Segment::flatten_to_text(&segments).contains(needle)
                        }
                        _ => false,
@@ -188,7 +188,8 @@ async fn make_worker(
    let pwd = pwd_tmp.path().to_path_buf();
    let scope = worker::Scope::writable(&pwd).unwrap();

-    let mut worker = Engine::new(client);
+    let mut worker =
+        Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(client);
    worker.register_tool(big_content_tool_definition(tool_name));

    let worker = Worker::new(
@@ -460,7 +461,8 @@ async fn metric_write_failure_emits_warn_alert_and_does_not_abort_run() {
    // protected token budget covers the only user message). That is enough to drive
    // the failure path: at least one metric attempts to write.
    let client = MockClient::new(vec![text_response_with_cache("hi", 0, 0)]);
-    let worker = Engine::new(client);
+    let worker =
+        Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(client);
    let mut worker = Worker::new(
        manifest,
        worker,
@@ -536,7 +538,8 @@ permission = "write"
    let pwd_tmp = tempfile::tempdir().unwrap();
    let pwd = pwd_tmp.path().to_path_buf();
    let scope = worker::Scope::writable(&pwd).unwrap();
-    let worker = Engine::new(client);
+    let worker =
+        Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(client);
    let mut worker = Worker::new(
        manifest,
        worker,
@@ -130,7 +130,8 @@ async fn make_worker_with_body(
        EffectivePromptCatalog::new(templates, 1, "test-schema", "test-toolchain").unwrap();
    let loader = PromptCatalogSource::builtins_only().with_effective_catalog(projection);

-    let worker = Engine::new(client);
+    let worker =
+        Engine::<_, agen::state::Mutable, worker::SessionHistoryMetadata>::new_annotated(client);
    let mut worker = Worker::new(
        manifest,
        worker,
@@ -357,6 +357,116 @@ pub struct UpdateWorkspaceMemorySettingsRequest {
    pub language: String,
 }

+/// Public metadata for one Workspace-scoped Repository SSH credential.
+///
+/// Secret references and secret material are deliberately not part of this DTO.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct RepositorySshCredential {
+    pub credential_id: String,
+    pub workspace_id: String,
+    pub name: String,
+    pub public_key_algorithm: String,
+    pub public_key_fingerprint: String,
+    pub current_revision: u64,
+    pub status: String,
+    pub created_at: String,
+    pub rotated_at: Option<String>,
+    #[serde(default)]
+    pub referenced_repositories: Vec<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct CreateRepositorySshCredentialRequest {
+    pub operation_id: String,
+    pub credential_id: String,
+    pub name: String,
+    pub private_key: String,
+    #[serde(default)]
+    pub passphrase: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct RotateRepositorySshCredentialRequest {
+    pub operation_id: String,
+    pub expected_revision: u64,
+    pub private_key: String,
+    #[serde(default)]
+    pub passphrase: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct DeleteRepositorySshCredentialRequest {
+    pub operation_id: String,
+    pub expected_revision: u64,
+}
+
+/// Public metadata for an explicitly pinned SSH host key.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct RepositorySshHostTrust {
+    pub host_trust_id: String,
+    pub workspace_id: String,
+    pub hostname: String,
+    pub port: u16,
+    pub key_algorithm: String,
+    pub host_key: String,
+    pub fingerprint: String,
+    pub current_revision: u64,
+    pub created_at: String,
+    pub updated_at: String,
+    #[serde(default)]
+    pub referenced_repositories: Vec<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct PutRepositorySshHostTrustRequest {
+    pub operation_id: String,
+    pub host_trust_id: String,
+    pub hostname: String,
+    pub port: u16,
+    pub host_key: String,
+    #[serde(default)]
+    pub expected_revision: Option<u64>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct DeleteRepositorySshHostTrustRequest {
+    pub operation_id: String,
+    pub expected_revision: u64,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
+pub enum RepositoryAccessMode {
+    ReadOnly,
+    ReadWrite,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct RepositorySshAccessBinding {
+    pub repository_id: String,
+    pub credential_id: String,
+    pub host_trust_id: String,
+    pub access: RepositoryAccessMode,
+}
+
+/// Secret-free active Repository access projection consumed by later Runtime work.
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(deny_unknown_fields)]
+pub struct RepositoryAccessProjection {
+    pub workspace_id: String,
+    pub config_revision: u64,
+    pub projection_digest: String,
+    pub bindings: Vec<RepositorySshAccessBinding>,
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -25,11 +25,13 @@ manifest.workspace = true
 protocol = { workspace = true }
 project-record.workspace = true
 reqwest = { version = "0.13", default-features = false, features = ["blocking", "json", "native-tls"] }
+ring.workspace = true
 rusqlite.workspace = true
 serde = { workspace = true, features = ["derive"] }
 serde_json.workspace = true
 serde_yaml.workspace = true
 sha2.workspace = true
+ssh-key.workspace = true
 thiserror.workspace = true
 ticket.workspace = true
 memory.workspace = true
@@ -46,6 +48,7 @@ tracing.workspace = true
 ts-rs = { version = "12.0.1", optional = true }
 url.workspace = true
 uuid = { workspace = true, features = ["v7"] }
+zeroize.workspace = true
 webauthn-rs = { workspace = true }

 [dev-dependencies]
@@ -22,7 +22,7 @@ use crate::records::{
    TicketEvidenceEvent, TicketEvidenceSummary, TicketListPageRequest, TicketMergeRequestSummary,
    TicketQueryItem, TicketQueryRequest, TicketQueryResponse, TicketRelationView,
    TicketRoleAssignmentSummary, TicketShowRequest, TicketSummary, TicketSummaryPage,
-    summarize_body, truncate_body, validate_project_id,
+    summarize_body, truncate_body,
 };
 use crate::store::{
    ControlPlaneStore, MemoryDocumentRecord, MemoryStagingRecord, MemoryStagingResolutionRecord,
@@ -633,7 +633,15 @@ impl SqliteWorkspaceAuthority {
            predicates.push(format!("o.updated_at<{value}"));
        }
        if let Some(value) = &query.linked_ticket_id {
-            let value = bind(SqlValue::Text(value.clone()));
+            let resolved = self
+                .store
+                .resolve_resource_reference(
+                    &self.workspace_id,
+                    WorkspaceResourceKind::Ticket,
+                    value,
+                )?
+                .ok_or_else(|| invalid_objective_error("linked Ticket was not found"))?;
+            let value = bind(SqlValue::Text(resolved));
            predicates.push(format!("EXISTS (SELECT 1 FROM objective_ticket_links link WHERE link.workspace_id=o.workspace_id AND link.objective_id=o.objective_id AND link.ticket_id={value})"));
        }
        let relevance_rank = if let Some(text) =
@@ -1237,6 +1245,10 @@ impl ObjectiveAuthority for SqliteWorkspaceAuthority {
                .into_iter()
                .map(|link| link.ticket_id)
                .collect::<Vec<_>>();
+            let linked_ticket_keys = linked_tickets
+                .iter()
+                .map(|ticket_id| self.resource_key(WorkspaceResourceKind::Ticket, ticket_id))
+                .collect::<Result<Vec<_>>>()?;
            let body_md = record.body_md.clone();
            let objective = ObjectiveSummary {
                resource_key: self
@@ -1253,6 +1265,7 @@ impl ObjectiveAuthority for SqliteWorkspaceAuthority {
            items.push(objective_query_item(
                objective,
                linked_tickets,
+                linked_ticket_keys,
                query.query.as_deref(),
                &body_md,
            ));
@@ -1339,9 +1352,19 @@ impl ObjectiveAuthority for SqliteWorkspaceAuthority {
    fn create_objective(&self, input: ObjectiveCreateInput) -> Result<ObjectiveDetail> {
        validate_objective_title(&input.title)?;
        validate_objective_state(&input.state)?;
-        for ticket_id in &input.linked_tickets {
-            validate_project_id(ticket_id)?;
-        }
+        let linked_tickets = input
+            .linked_tickets
+            .iter()
+            .map(|ticket_reference| {
+                self.store
+                    .resolve_resource_reference(
+                        &self.workspace_id,
+                        WorkspaceResourceKind::Ticket,
+                        ticket_reference,
+                    )?
+                    .ok_or_else(|| invalid_objective_error("linked Ticket was not found"))
+            })
+            .collect::<Result<Vec<_>>>()?;
        let now = now_rfc3339();
        let objective_id = allocate_record_id(
            unix_epoch_millis_now().map_err(|err| {
@@ -1367,8 +1390,7 @@ impl ObjectiveAuthority for SqliteWorkspaceAuthority {
            updated_at: now.clone(),
        };
        self.store.upsert_objective(&record)?;
-        let links = input
-            .linked_tickets
+        let links = linked_tickets
            .into_iter()
            .map(|ticket_id| ObjectiveTicketLinkRecord {
                workspace_id: self.workspace_id.clone(),
@@ -2283,12 +2305,18 @@ fn ticket_query_item(
            .iter()
            .map(|objective| objective.id.clone())
            .collect(),
+        linked_objective_keys: detail
+            .linked_objectives
+            .iter()
+            .map(|objective| objective.resource_key.clone())
+            .collect(),
        relation_count: detail.relations.outgoing.len() + detail.relations.incoming.len(),
        blocker_count: detail.relations.blockers.len(),
        unresolved_blocker_count: detail.relations.blockers.len(),
        unresolved_review_count: usize::from(detail.evidence.unresolved_request_changes),
        evidence: detail.evidence.clone(),
        merge_request: detail.merge_request.clone(),
+        current_coder: detail.current_coder.clone(),
    }
 }

@@ -2399,6 +2427,7 @@ fn ticket_item_after_cursor(
 fn objective_query_item(
    objective: ObjectiveSummary,
    linked_tickets: Vec<String>,
+    linked_ticket_keys: Vec<String>,
    text: Option<&str>,
    body_md: &str,
 ) -> ObjectiveQueryItem {
@@ -2426,6 +2455,7 @@ fn objective_query_item(
        snippet,
        linked_ticket_count: linked_tickets.len(),
        linked_tickets,
+        linked_ticket_keys,
    }
 }

@@ -3308,16 +3338,21 @@ VALUES ('workspace-test', 'ticket', 4);
        assert!(!objective.revision.is_empty());
        assert_eq!(objective.linked_ticket_summaries[0].id, "00000000001J2");
        assert_eq!(objective.linked_ticket_summaries[0].state, "ready");
+        let linked_ticket_key = objective.linked_ticket_summaries[0].resource_key.clone();
        let objective_query = authority
            .query_objectives(ObjectiveQueryRequest {
                query: Some("Control plane".to_string()),
-                linked_ticket_id: Some("00000000001J2".to_string()),
+                linked_ticket_id: Some(linked_ticket_key.clone()),
                limit: Some(1),
                ..ObjectiveQueryRequest::default()
            })
            .unwrap();
        assert_eq!(objective_query.items.len(), 1);
        assert_eq!(objective_query.items[0].linked_ticket_count, 1);
+        assert_eq!(
+            objective_query.items[0].linked_ticket_keys,
+            vec![linked_ticket_key]
+        );
        assert_eq!(objective_query.page.limit, 1);
        let body_query = authority
            .query_objectives(ObjectiveQueryRequest {
@@ -3410,7 +3445,7 @@ VALUES ('workspace-test', 'ticket', 3);
                title: "Create Objective".to_string(),
                body_md: "Alpha body".to_string(),
                state: "active".to_string(),
-                linked_tickets: vec!["00000000001J2".to_string()],
+                linked_tickets: vec!["T-1".to_string()],
            })
            .unwrap();
        assert_eq!(created.title, "Create Objective");
@@ -3436,14 +3471,14 @@ VALUES ('workspace-test', 'ticket', 3);
        assert_eq!(state.state, "paused");
        assert_eq!(
            authority
-                .link_objective_ticket(&created.id, "00000000001J3")
+                .link_objective_ticket(&created.id, "T-2")
                .unwrap()
                .linked_tickets,
            vec!["00000000001J2", "00000000001J3"]
        );
        assert_eq!(
            authority
-                .unlink_objective_ticket(&created.id, "00000000001J2")
+                .unlink_objective_ticket(&created.id, "T-1")
                .unwrap()
                .linked_tickets,
            vec!["00000000001J3"]
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Hare	acb3c6d68b	fix: separate Ticket keys from assignment identity	2026-08-29 22:52:03 +09:00
Hare	40ac83e632	chore: merge develop into hare/develop	2026-08-29 13:25:32 +09:00
Hare	58da395941	fix: merge workdir registry cleanup	2026-08-29 13:21:40 +09:00
Hare	0e3ef94c9e	feat: merge web console tool call presentation	2026-08-29 13:21:35 +09:00
Hare	1f68dfc2b5	fix: group grep content output by file	2026-08-28 02:05:12 +09:00
Hare	84977a464c	feat: improve web console tool call presentation	2026-08-28 00:05:00 +09:00
Hare	62ada5eaa4	fix: bound safe-boundary pause escalation	2026-08-27 23:57:20 +09:00
Hare	f5ff0b7c13	fix: confirm bash cancellation cleanup	2026-08-27 23:01:06 +09:00
Hare	3337cafcdf	feat: own cancellable tool execution lifecycle	2026-08-27 23:01:00 +09:00
Hare	e87784118b	fix: preserve resumable paused tool calls	2026-08-27 21:48:59 +09:00
Hare	40fada28ea	fix: preserve confirmed output on interceptor abort	2026-08-27 21:30:04 +09:00
Hare	58cc94d4b7	fix: terminalize interrupted tool executions	2026-08-27 20:54:13 +09:00
Hare	ccabea59c9	fix: terminalize parallel tool outputs on completion	2026-08-27 19:16:49 +09:00
Hare	8cc1dc042d	fix: remove deleted workdirs from registry	2026-08-27 18:36:17 +09:00
Hare	183c37446e	fix: fence running snapshots on input commit	2026-08-27 15:42:20 +09:00
Hare	7aa06afc45	chore: preserve reviewed source lineage # Conflicts: # crates/agen/README.md # crates/agen/examples/engine_cancel_demo.rs # crates/agen/examples/engine_cli.rs # crates/agen/src/engine.rs # crates/agen/tests/annotated_history_test.rs # crates/agen/tests/callback_test.rs # crates/agen/tests/engine_fixtures.rs # crates/agen/tests/engine_state_test.rs # crates/agen/tests/parallel_execution_test.rs # crates/agen/tests/reasoning_round_trip_test.rs # crates/session-store/tests/session_test.rs # crates/worker/src/worker.rs	2026-08-27 15:13:27 +09:00
Hare	1515a2fb86	fix: reconcile typed history with run exits	2026-08-27 15:12:05 +09:00
Hare	ec798c58d7	fix: preserve annotated history through rewind	2026-08-27 14:54:24 +09:00
Hare	e365189276	feat: add provenance-aware worker history	2026-08-27 14:54:24 +09:00
Hare	116d610ad0	fix: project Ticket mutation outputs to human keys	2026-08-27 14:18:48 +09:00
Hare	75c570962d	Merge commit '7edc588202dfbfd4c834f677f510ddda7f3d6451' into work/00001M10HW6BV-model-facing-resource-projection	2026-08-27 13:46:19 +09:00
Hare	cae8ac1799	fix: allow missing Objective query snippets	2026-08-27 13:46:10 +09:00
Hare	917cc222a3	fix: resolve relation summaries to Ticket keys	2026-08-27 13:22:08 +09:00
Hare	7edc588202	chore: refresh T-528 after T-541	2026-08-27 13:09:44 +09:00
Hare	c83461508b	Merge commit '21b3dd1da1b1bbf18799a0623bf67dbe6266067c' into work/00001M10HW6BV-model-facing-resource-projection	2026-08-27 13:09:15 +09:00
Hare	651d64f34d	Merge branch 'work/00001M10N3Z0H-ticket-detail-route-sync' into hare/develop	2026-08-27 12:57:52 +09:00
Hare	b98d4b59f5	fix: synchronize reused ticket detail routes	2026-08-27 12:55:01 +09:00
Hare	374449e663	feat: add provenance-aware worker history	2026-08-27 12:51:01 +09:00
Hare	4c876a201b	fix: validate projected resource keys canonically	2026-08-27 12:49:59 +09:00
Hare	21b3dd1da1	Merge commit '0496cd907bc7bb96e9aa1c6d385bedb616bf3233' into work/00001M10FJVA2-orchestrator-queue-notice	2026-08-27 12:46:27 +09:00
Hare	5ca0ea9228	fix: sanitize orchestrator queue attention	2026-08-27 12:46:10 +09:00
Hare	d5c3a68a37	fix: use Ticket resource keys in handoffs	2026-08-27 12:45:08 +09:00
Hare	2b33b9158d	chore: refresh T-528 against develop	2026-08-27 12:45:01 +09:00
Hare	b31642e284	feat: project Ticket and Objective human references	2026-08-27 12:39:28 +09:00
Hare	3a7a3307ef	fix: map internal worker terminal lifecycles	2026-08-27 12:27:55 +09:00
Hare	0496cd907b	fix: use Ticket resource keys in handoffs	2026-08-27 12:24:19 +09:00
Hare	975b4fa700	feat: add typed engine run exits	2026-08-27 11:42:49 +09:00
Hare	060f280fdf	fix: allow parent commands during write delegation	2026-08-27 11:27:27 +09:00
Hare	7aaf189247	fix: scope delegated commands by cwd	2026-08-27 11:11:06 +09:00
Hare	df6d99c07d	Merge branch 'develop' into hare/develop	2026-08-27 09:21:58 +09:00
Hare	63306cf017	feat: integrate runtime Git cache materialization	2026-08-27 08:30:38 +09:00
Hare	08be5e85e4	fix: preserve command sessions across access refresh	2026-08-27 08:09:22 +09:00
Hare	9843510e1f	fix: remove conflicting coder worker control provider	2026-08-26 23:52:25 +09:00
Hare	83bda3dfb2	fix: restore companion subworker control	2026-08-26 22:06:34 +09:00
Hare	0ab15aa227	chore: merge hare/develop into develop	2026-08-26 19:44:31 +09:00
Hare	29c2fb8e06	fix: refresh repository access for worker workdirs	2026-08-26 19:27:10 +09:00
Hare	4ebc465e8d	fix: constrain repository SSH commands to authorized source	2026-08-26 19:02:20 +09:00
Hare	4b132a21e9	fix: bind repository SSH secrets to one-shot resources	2026-08-26 18:28:22 +09:00
Hare	b644971d45	fix: preauthorize repository access without persisting secrets	2026-08-26 17:23:43 +09:00
Hare	df34533765	fix: broker read-only repository SSH operations	2026-08-26 16:48:37 +09:00
Hare	6f4efb36bb	fix: order optional feature service bindings	2026-08-26 16:28:54 +09:00
Hare	108d5b14d7	fix: withhold write-capable credentials from read-only sessions	2026-08-26 16:23:48 +09:00
Hare	f633b86b35	chore: integrate current develop for review	2026-08-26 16:12:48 +09:00
Hare	1873e18f8e	fix: enforce attachment access transitions	2026-08-26 16:10:39 +09:00
Hare	3cdcbb47bf	fix: preserve selector retries and workdir observations	2026-08-26 16:05:14 +09:00
Hare	aaa9c7987c	fix: reject ambiguous feature service providers	2026-08-26 16:01:06 +09:00
Hare	048007a042	test: complete tool output fixture	2026-08-26 15:47:34 +09:00
Hare	cb35b40b9d	feat: plan feature service installation	2026-08-26 15:47:27 +09:00
Hare	3b71fe03b4	fix: include merge request status regression in web tests	2026-08-26 15:27:19 +09:00
Hare	471db64bcc	fix: preserve repository access across retries	2026-08-26 15:21:52 +09:00
Hare	5e2234763c	fix: distinguish completed review requests in merge request status	2026-08-26 15:20:13 +09:00
Hare	1d140be715	feat: align merge request review workflow with selector refs	2026-08-26 15:03:26 +09:00
Hare	ffb2a34ae5	fix: enforce repository access and cache boundaries	2026-08-26 14:39:37 +09:00
Hare	ccf7de1a55	fix: preserve run budget across segment forks	2026-08-26 14:13:43 +09:00
Hare	ccf3c80d29	fix: clear abandoned run budget before compaction	2026-08-26 14:03:07 +09:00
Hare	3a3c89e0b4	feat: materialize repositories through runtime Git cache	2026-08-26 13:54:25 +09:00
Hare	17c629136a	fix: scope max turns to logical runs	2026-08-26 13:47:35 +09:00
Hare	52a5c4141f	chore: merge current develop into Ticket source	2026-08-26 12:24:14 +09:00
Hare	c9ba27c333	fix: update RepositoryRecord test URI access	2026-08-26 11:50:41 +09:00
Hare	46f6e2c58b	fix: complete Repository access management contracts	2026-08-26 11:38:23 +09:00
Hare	d1f47e5a22	fix: align Repository access DCDL fields	2026-08-26 11:06:19 +09:00
Hare	65de94bad3	feat: expose compaction as an internal worker	2026-08-26 10:39:43 +09:00
Hare	a9fb092834	feat: add Repository access settings UI	2026-08-26 08:51:23 +09:00
Hare	3a21a68792	feat: add Workspace Repository SSH secret authority	2026-08-26 08:51:15 +09:00