feat: spill long bash output to worker temp storage

crates/fs-operation/src/lib.rs

@@ -177,6 +177,8 @@ mod tests {
     fn logical_paths_reject_absolute_parent_and_backslash_forms() {
         assert!(FsPath::new("src/lib.rs").is_ok());
         assert!(FsPath::new("/tmp/file").is_err());
+        assert!(FsPath::new_scoped("/tmp/file").is_ok());
+        assert!(FsPath::new_scoped("/tmp/../secret").is_err());
         assert!(FsPath::new("../file").is_err());
         assert!(FsPath::new("src\\lib.rs").is_err());
     }

crates/fs-operation/src/operation.rs

@@ -5,7 +5,8 @@ use serde::{Deserialize, Serialize};
 
 use crate::FsError;
 
-/// Logical path relative to the bound Workdir root.
+/// Scope-checked filesystem path. Relative paths resolve below the bound
+/// Workdir root; absolute paths require an explicit matching scope rule.
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize)]
 #[serde(transparent)]
 pub struct FsPath(String);
@@ -16,11 +17,30 @@ impl<'de> Deserialize<'de> for FsPath {
         D: serde::Deserializer<'de>,
     {
         let value = String::deserialize(deserializer)?;
-        Self::new(&value).map_err(serde::de::Error::custom)
+        Self::new_scoped(&value).map_err(serde::de::Error::custom)
     }
 }
 
 impl FsPath {
+    /// Construct a path for a scope-checked operation that may target an
+    /// explicitly granted absolute path outside the provider root.
+    pub fn new_scoped(value: impl Into<String>) -> Result<Self, FsError> {
+        let value = value.into();
+        if !Path::new(&value).is_absolute() {
+            return Self::new(value);
+        }
+        if value.contains('\\') {
+            return Err(FsError::InvalidPath(value));
+        }
+        if Path::new(&value)
+            .components()
+            .any(|component| component == Component::ParentDir)
+        {
+            return Err(FsError::InvalidPath(value));
+        }
+        Ok(Self(value))
+    }
+
     pub fn root() -> Self {
         Self(String::new())
     }

crates/standalone/src/host.rs

@@ -10,7 +10,9 @@ use session_store::{
     CombinedStore, FsStore, FsWorkerStore, WorkerActiveSegmentRef, WorkerMetadataStore,
 };
 use thiserror::Error;
-use worker::bootstrap::{WorkerBootstrap, WorkerBootstrapError, WorkerBootstrapLayout};
+use worker::bootstrap::{
+    WorkerBootstrap, WorkerBootstrapError, WorkerBootstrapLayout, bash_output_dir_for_worker_id,
+};
 use worker::controller::WorkerControllerTransport;
 use worker::ipc::protocol_session::{
     WorkerProtocolSessionStreams, dispatch_worker_protocol_method, live_log_entry_event,
@@ -115,6 +117,7 @@ impl StandaloneHost {
             WorkerFilesystemAuthority::local(launch.cwd.clone(), launch.cwd.clone());
         let workspace_context = WorkerWorkspaceContext::local_filesystem(None);
         let runtime_base = store.runtime_dir(worker_id);
+        let bash_output_dir = bash_output_dir_for_worker_id(worker_id);
 
         let mut bootstrap = WorkerBootstrap::new(
             bootstrap_manifest,
@@ -122,7 +125,10 @@ impl StandaloneHost {
             launch.prompt_catalog,
             workspace_context,
             filesystem_authority,
-            WorkerBootstrapLayout::Direct { runtime_base },
+            WorkerBootstrapLayout::Direct {
+                runtime_base,
+                bash_output_dir,
+            },
             WorkerControllerTransport::InProcess,
         );
         if let Some(model_client) = model_client {
@@ -208,6 +214,7 @@ impl StandaloneHost {
         );
         let workspace_context = WorkerWorkspaceContext::local_filesystem(None);
         let runtime_base = store.runtime_dir(worker_id);
+        let bash_output_dir = bash_output_dir_for_worker_id(worker_id);
 
         let mut bootstrap = WorkerBootstrap::new(
             manifest,
@@ -215,7 +222,10 @@ impl StandaloneHost {
             worker::PromptCatalogSource::builtins_only(),
             workspace_context,
             filesystem_authority,
-            WorkerBootstrapLayout::Direct { runtime_base },
+            WorkerBootstrapLayout::Direct {
+                runtime_base,
+                bash_output_dir,
+            },
             WorkerControllerTransport::InProcess,
         );
         if let Some(model_client) = model_client {

crates/tools/src/bash.rs

@@ -21,6 +21,7 @@ struct BashParams {
 
 pub(crate) struct BashTool {
     session: WorkdirSessionHandle,
+    output_dir: PathBuf,
     state: Arc<Mutex<BashExecutionState>>,
 }
 
@@ -117,6 +118,7 @@ impl Tool for BashTool {
                 command: params.command,
                 timeout_secs,
                 output_limit: INLINE_BYTE_BUDGET,
+                spill_dir: Some(self.output_dir.clone()),
                 tool_call_id: Some(call_id.clone()),
             })
             .await
@@ -183,10 +185,15 @@ impl Tool for BashTool {
         let content = if output.content.is_empty() {
             None
         } else if output.truncated {
-            Some(format!(
-                "[showing bounded WorkdirSession command output; additional output was truncated]\n{}",
-                output.content
-            ))
+            let notice = match output.output_path {
+                Some(path) => format!(
+                    "[showing bounded WorkdirSession command output; full output saved to {}]",
+                    path.display()
+                ),
+                None => "[showing bounded WorkdirSession command output; additional output was truncated]"
+                    .to_owned(),
+            };
+            Some(format!("{notice}\n{}", output.content))
         } else {
             Some(output.content)
         };
@@ -259,16 +266,137 @@ fn truncate_for_summary(command: &str) -> String {
     summary
 }
 
-pub fn bash_tool(session: WorkdirSessionHandle, _output_dir: PathBuf) -> ToolDefinition {
+pub fn bash_tool(session: WorkdirSessionHandle, output_dir: PathBuf) -> ToolDefinition {
     Arc::new(move || {
         let schema = schemars::schema_for!(BashParams);
         let meta = ToolMeta::new("Bash")
-            .description("Execute a shell command in the bound Workdir. Process start, bounded output, timeout and cancellation are owned by the WorkdirSession provider. This is not a sandbox.")
+            .description("Execute a shell command in the bound Workdir. Process start, bounded inline output, full-output spill, timeout and cancellation are owned by the WorkdirSession provider. This is not a sandbox.")
             .input_schema(serde_json::to_value(schema).expect("Bash schema serialization"));
         let tool: Arc<dyn Tool> = Arc::new(BashTool {
             session: session.clone(),
+            output_dir: output_dir.clone(),
             state: Arc::new(Mutex::new(BashExecutionState::default())),
         });
         (meta, tool)
     })
 }
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+
+    use manifest::{Permission, Scope, ScopeConfig, ScopeRule};
+    use tempfile::TempDir;
+    use workdir::{LocalWorkdirSession, WorkdirSessionHandle};
+
+    use super::bash_tool;
+    use crate::{grep::grep_tool, read::read_tool, tracker::Tracker};
+
+    fn session_with_output_scope(root: &TempDir, output: &TempDir) -> WorkdirSessionHandle {
+        let scope = Scope::from_config(&ScopeConfig {
+            allow: vec![
+                ScopeRule {
+                    target: root.path().to_path_buf(),
+                    permission: Permission::Write,
+                    recursive: true,
+                },
+                ScopeRule {
+                    target: output.path().to_path_buf(),
+                    permission: Permission::Read,
+                    recursive: true,
+                },
+            ],
+            deny: Vec::new(),
+        })
+        .unwrap();
+        Arc::new(LocalWorkdirSession::new(scope, root.path().to_path_buf()))
+    }
+
+    #[tokio::test]
+    async fn long_output_is_spilled_and_available_to_read_and_grep() {
+        let root = TempDir::new().unwrap();
+        let output = TempDir::new().unwrap();
+        let session = session_with_output_scope(&root, &output);
+        let (_, bash) = bash_tool(session.clone(), output.path().to_path_buf())();
+        let command = "i=0; while [ $i -lt 2000 ]; do printf 'line-%04d\\n' \"$i\"; i=$((i+1)); done; printf 'FINAL-NEEDLE\\n'";
+        let result = bash
+            .execute(
+                &serde_json::json!({ "command": command }).to_string(),
+                Default::default(),
+            )
+            .await
+            .unwrap();
+        let rendered = result.content.expect("bounded Bash output");
+        let artifact = std::fs::read_dir(output.path())
+            .unwrap()
+            .next()
+            .expect("artifact entry")
+            .unwrap()
+            .path();
+
+        assert!(rendered.contains("full output saved to"));
+        assert!(rendered.contains(&artifact.display().to_string()));
+        let retained = std::fs::read_to_string(&artifact).unwrap();
+        assert!(retained.starts_with("line-0000\n"));
+        assert!(retained.ends_with("FINAL-NEEDLE\n"));
+        assert_eq!(retained.lines().count(), 2001);
+
+        let (_, read) = read_tool(session.clone(), Tracker::new())();
+        let read_result = read
+            .execute(
+                &serde_json::json!({
+                    "file_path": artifact,
+                    "offset": 2000,
+                    "limit": 1,
+                })
+                .to_string(),
+                Default::default(),
+            )
+            .await
+            .unwrap();
+        assert!(
+            read_result
+                .content
+                .expect("Read content")
+                .contains("FINAL-NEEDLE")
+        );
+
+        let (_, grep) = grep_tool(session)();
+        let grep_result = grep
+            .execute(
+                &serde_json::json!({
+                    "pattern": "FINAL-NEEDLE",
+                    "path": artifact,
+                    "output_mode": "content",
+                })
+                .to_string(),
+                Default::default(),
+            )
+            .await
+            .unwrap();
+        let grep_content = grep_result.content.expect("Grep content");
+        assert!(
+            grep_content.contains("FINAL-NEEDLE"),
+            "unexpected Grep content: {grep_content:?}"
+        );
+    }
+
+    #[tokio::test]
+    async fn short_output_does_not_leave_a_spill_artifact() {
+        let root = TempDir::new().unwrap();
+        let output = TempDir::new().unwrap();
+        let session = session_with_output_scope(&root, &output);
+        let (_, bash) = bash_tool(session, output.path().to_path_buf())();
+
+        let result = bash
+            .execute(
+                &serde_json::json!({ "command": "printf short" }).to_string(),
+                Default::default(),
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(result.content.as_deref(), Some("short"));
+        assert_eq!(std::fs::read_dir(output.path()).unwrap().count(), 0);
+    }
+}

crates/tools/src/grep.rs

@@ -22,7 +22,7 @@ enum OutputMode {
 #[derive(Debug, Deserialize, JsonSchema)]
 struct GrepParams {
     pattern: String,
-    /// Logical Workdir-relative file or directory to search. Defaults to the Workdir root.
+    /// Workdir-relative path, or an absolute path covered by readable scope. Defaults to the Workdir root.
     #[serde(default)]
     path: Option<String>,
     #[serde(default)]
@@ -61,7 +61,7 @@ impl Tool for GrepTool {
         let params: GrepParams = serde_json::from_str(input_json)
             .map_err(|error| ToolError::InvalidArgument(format!("invalid Grep input: {error}")))?;
         let path = match params.path {
-            Some(path) => WorkdirPath::new(&path).map_err(ToolsError::from)?,
+            Some(path) => WorkdirPath::new_scoped(&path).map_err(ToolsError::from)?,
             None => WorkdirPath::root(),
         };
         let mode = match params.output_mode.unwrap_or_default() {

crates/tools/src/read.rs

@@ -13,14 +13,14 @@ use workdir::{ReadRequest, WorkdirPath, WorkdirSessionHandle};
 const DESCRIPTION: &str = "Read a text file from the local filesystem. \
 Supports offset/limit for large files. Returns line-numbered output (1-based). \
 Directories cannot be read. The file must be read before Write or Edit can \
-modify it. Paths are relative to the bound Workdir.";
+modify it. Paths are Workdir-relative unless an absolute path is explicitly readable.";
 
 const DEFAULT_LIMIT: usize = 2000;
 const PROVIDER_BYTE_LIMIT: usize = 256 * 1024;
 
 #[derive(Debug, Deserialize, schemars::JsonSchema)]
 pub(crate) struct ReadParams {
-    /// Logical path relative to the bound Workdir root.
+    /// Workdir-relative path, or an absolute path covered by readable scope.
     pub file_path: String,
     /// 0-based line offset from the start. Defaults to 0.
     #[serde(default)]
@@ -47,7 +47,7 @@ impl Tool for ReadTool {
         let offset = params.offset.unwrap_or(0);
         let limit = params.limit.unwrap_or(DEFAULT_LIMIT).max(1);
 
-        let path = WorkdirPath::new(&params.file_path).map_err(ToolsError::from)?;
+        let path = WorkdirPath::new_scoped(&params.file_path).map_err(ToolsError::from)?;
         tracing::debug!(path = %path, offset, limit, "Read");
 
         let result = self

crates/tools/tests/edge_cases.rs

@@ -224,20 +224,23 @@ async fn very_long_single_line() {
 }
 
 #[tokio::test]
-async fn absolute_path_is_rejected() {
-    let (dir, _spill, reg) = setup();
+async fn absolute_path_requires_matching_read_scope() {
+    let (_dir, _spill, reg) = setup();
+    let outside = tempfile::tempdir().unwrap();
+    let outside_file = outside.path().join("outside.txt");
+    std::fs::write(&outside_file, "secret").unwrap();
     let read = reg.get("Read");
     let err = read
         .execute(
-            &json!({ "file_path": dir.path().join("outside.txt") }).to_string(),
+            &json!({ "file_path": outside_file }).to_string(),
             Default::default(),
         )
         .await
         .unwrap_err();
     let msg = format!("{err}");
     assert!(
-        msg.contains("invalid logical filesystem path"),
-        "absolute path was not rejected as invalid: {msg}"
+        msg.contains("outside allowed scope"),
+        "absolute path escaped readable scope: {msg}"
     );
 }
 

crates/tools/tests/integration.rs

@@ -394,14 +394,21 @@ async fn bash_inherits_workdir_cwd() {
 }
 
 #[tokio::test]
-async fn bash_provider_output_does_not_expose_internal_paths() {
+async fn bash_provider_output_exposes_readable_retained_path() {
     let (_dir, spill, reg) = setup();
     let bash = reg.get("Bash");
     let out = call(&bash, json!({ "command": "printf 'x%.0s' {1..20480}" })).await;
     let body = out.content.unwrap();
     assert!(body.contains("bounded WorkdirSession command output"));
-    assert!(!body.contains(spill.path().to_str().unwrap()));
-    assert_eq!(std::fs::read_dir(spill.path()).unwrap().count(), 0);
+    assert!(body.contains("full output saved to"));
+    assert!(body.contains(spill.path().to_str().unwrap()));
+    let artifact = std::fs::read_dir(spill.path())
+        .unwrap()
+        .next()
+        .expect("retained output")
+        .unwrap()
+        .path();
+    assert_eq!(std::fs::metadata(artifact).unwrap().len(), 20_480);
 }
 
 #[tokio::test]

crates/workdir/src/delegation.rs

@@ -743,6 +743,7 @@ mod tests {
                 command: command.into(),
                 timeout_secs: 5,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: Some(tool_call_id.into()),
             })
             .await
@@ -770,6 +771,7 @@ mod tests {
                 command: "printf ready; sleep 0.2; printf done".into(),
                 timeout_secs: 5,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: Some("tool-delegated".into()),
             })
             .await
@@ -858,6 +860,7 @@ mod tests {
                     command: "printf denied".into(),
                     timeout_secs: 5,
                     output_limit: 1024,
+                    spill_dir: None,
                     tool_call_id: Some("read-only-command".into()),
                 })
                 .await,
@@ -993,6 +996,7 @@ mod tests {
                     command: "printf revoked".into(),
                     timeout_secs: 5,
                     output_limit: 1024,
+                    spill_dir: None,
                     tool_call_id: Some("revoked-child-command".into()),
                 })
                 .await,
@@ -1171,6 +1175,7 @@ mod tests {
                     command: "printf closed".into(),
                     timeout_secs: 5,
                     output_limit: 1024,
+                    spill_dir: None,
                     tool_call_id: Some("closed-parent-command".into()),
                 })
                 .await,

crates/workdir/src/local.rs

@@ -10,9 +10,7 @@
 
 use std::collections::{BTreeMap, HashMap};
 use std::fmt::Debug;
-#[cfg(test)]
-use std::io::Write as _;
-use std::io::{Read as _, Seek as _, SeekFrom};
+use std::io::{Read as _, Seek as _, SeekFrom, Write as _};
 use std::path::{Path, PathBuf};
 use std::process::Stdio;
 use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
@@ -691,6 +689,11 @@ impl WorkdirSession for LocalWorkdirSession {
     async fn start_command(&self, request: CommandRequest) -> Result<CommandHandle, WorkdirError> {
         self.ensure_capability(WorkdirSessionCapability::Command)?;
         self.ensure_open()?;
+        if let Some(spill_dir) = request.spill_dir.as_deref()
+            && !self.inner.scope.snapshot().is_readable(spill_dir)
+        {
+            return Err(WorkdirError::OutOfScope(spill_dir.to_path_buf()));
+        }
         let id = self.inner.next_command_id.fetch_add(1, Ordering::Relaxed);
         let handle = CommandHandle(format!("command-{id}"));
         let cwd = self.inner.cwd.clone();
@@ -776,6 +779,7 @@ impl WorkdirSession for LocalWorkdirSession {
                         content: String::new(),
                         next_cursor: None,
                         truncated: false,
+                        output_path: None,
                     });
                 }
                 drop(commands);
@@ -792,6 +796,7 @@ impl WorkdirSession for LocalWorkdirSession {
                     content: String::new(),
                     next_cursor: None,
                     truncated: false,
+                    output_path: None,
                 });
             }
             break commands
@@ -901,6 +906,7 @@ fn command_output_page(output: &CommandOutput, cursor: usize, limit: usize) -> C
         content,
         next_cursor: (end < total_chars).then_some(end),
         truncated: output.truncated || end < total_chars,
+        output_path: output.output_path.clone(),
     }
 }
 
@@ -1059,6 +1065,22 @@ async fn run_command(
 
     let (content, truncated) =
         read_command_output_files(&stdout_path, &stderr_path, request.output_limit.max(1))?;
+    let output_path = match (truncated, request.spill_dir) {
+        (true, Some(spill_dir)) => {
+            let stdout_path = stdout_path.to_path_buf();
+            let stderr_path = stderr_path.to_path_buf();
+            Some(
+                tokio::task::spawn_blocking(move || {
+                    persist_command_output(&stdout_path, &stderr_path, &spill_dir)
+                })
+                .await
+                .map_err(|error| {
+                    WorkdirError::Unavailable(format!("Bash output spill task failed: {error}"))
+                })??,
+            )
+        }
+        _ => None,
+    };
     Ok(CommandOutput {
         status,
         exit_code,
@@ -1066,6 +1088,7 @@ async fn run_command(
         content,
         next_cursor: None,
         truncated,
+        output_path,
     })
 }
 
@@ -1154,6 +1177,59 @@ fn stable_utf8_prefix_len(bytes: &[u8]) -> usize {
     inspected
 }
 
+fn persist_command_output(
+    stdout_path: &Path,
+    stderr_path: &Path,
+    spill_dir: &Path,
+) -> Result<PathBuf, WorkdirError> {
+    std::fs::create_dir_all(spill_dir).map_err(|error| WorkdirError::io(spill_dir, error))?;
+    let mut artifact = tempfile::Builder::new()
+        .prefix("bash-")
+        .suffix(".log")
+        .tempfile_in(spill_dir)
+        .map_err(|error| WorkdirError::io(spill_dir, error))?;
+    let artifact_path = artifact.path().to_path_buf();
+
+    let mut stdout =
+        std::fs::File::open(stdout_path).map_err(|error| WorkdirError::io(stdout_path, error))?;
+    let stdout_len = stdout
+        .metadata()
+        .map_err(|error| WorkdirError::io(stdout_path, error))?
+        .len();
+    std::io::copy(&mut stdout, &mut artifact)
+        .map_err(|error| WorkdirError::io(&artifact_path, error))?;
+
+    let mut stderr =
+        std::fs::File::open(stderr_path).map_err(|error| WorkdirError::io(stderr_path, error))?;
+    let stderr_len = stderr
+        .metadata()
+        .map_err(|error| WorkdirError::io(stderr_path, error))?
+        .len();
+    if stdout_len > 0 && stderr_len > 0 {
+        stdout
+            .seek(SeekFrom::End(-1))
+            .map_err(|error| WorkdirError::io(stdout_path, error))?;
+        let mut last = [0_u8; 1];
+        stdout
+            .read_exact(&mut last)
+            .map_err(|error| WorkdirError::io(stdout_path, error))?;
+        if last[0] != b'\n' {
+            artifact
+                .write_all(b"\n")
+                .map_err(|error| WorkdirError::io(&artifact_path, error))?;
+        }
+    }
+    std::io::copy(&mut stderr, &mut artifact)
+        .map_err(|error| WorkdirError::io(&artifact_path, error))?;
+    artifact
+        .flush()
+        .map_err(|error| WorkdirError::io(&artifact_path, error))?;
+    artifact
+        .keep()
+        .map(|(_, path)| path)
+        .map_err(|error| WorkdirError::io(&artifact_path, error.error))
+}
+
 fn read_command_output_files(
     stdout_path: &Path,
     stderr_path: &Path,
@@ -1440,6 +1516,7 @@ mod tests {
                 command: "sleep 30".to_owned(),
                 timeout_secs: 60,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: None,
             },
         )
@@ -1966,6 +2043,7 @@ mod tests {
                 command: "pwd && printf provider-command".into(),
                 timeout_secs: 5,
                 output_limit: 4096,
+                spill_dir: None,
                 tool_call_id: None,
             },
         )
@@ -1991,6 +2069,151 @@ mod tests {
         );
     }
 
+    #[tokio::test]
+    async fn explicitly_scoped_absolute_artifact_can_be_read_and_grepped() {
+        let dir = TempDir::new().unwrap();
+        let spill = TempDir::new().unwrap();
+        let artifact = spill.path().join("bash-output.log");
+        std::fs::write(&artifact, "first\nFINAL-NEEDLE\nlast\n").unwrap();
+        let scope = Scope::from_config(&ScopeConfig {
+            allow: vec![
+                ScopeRule {
+                    target: dir.path().to_path_buf(),
+                    permission: Permission::Write,
+                    recursive: true,
+                },
+                ScopeRule {
+                    target: spill.path().to_path_buf(),
+                    permission: Permission::Read,
+                    recursive: true,
+                },
+            ],
+            deny: Vec::new(),
+        })
+        .unwrap();
+        let workdir = LocalWorkdirSession::new(scope, dir.path().to_path_buf());
+        let artifact_path = WorkdirPath::new_scoped(artifact.to_string_lossy()).unwrap();
+
+        let read = WorkdirSession::read(
+            &workdir,
+            ReadRequest {
+                path: artifact_path.clone(),
+                offset: 1,
+                limit: 1,
+                max_bytes: 1024,
+            },
+        )
+        .await
+        .unwrap();
+        assert_eq!(String::from_utf8(read.bytes).unwrap(), "FINAL-NEEDLE\n");
+
+        let grep = WorkdirSession::grep(
+            &workdir,
+            GrepRequest {
+                pattern: "FINAL-NEEDLE".into(),
+                path: artifact_path,
+                glob: None,
+                file_type: None,
+                case_insensitive: false,
+                before_context: 0,
+                after_context: 0,
+                multiline: false,
+                output_mode: crate::GrepOutputMode::Content,
+                limit: 10,
+                offset: 0,
+            },
+        )
+        .await
+        .unwrap();
+        assert_eq!(grep.match_count, 1);
+        assert!(grep.output.contains("FINAL-NEEDLE"));
+    }
+
+    #[tokio::test]
+    async fn command_rejects_spill_directory_without_read_scope() {
+        let dir = TempDir::new().unwrap();
+        let spill = TempDir::new().unwrap();
+        let workdir = make_fs(&dir);
+
+        let error = WorkdirSession::start_command(
+            &workdir,
+            CommandRequest {
+                command: "printf hidden".into(),
+                timeout_secs: 5,
+                output_limit: 1,
+                spill_dir: Some(spill.path().to_path_buf()),
+                tool_call_id: None,
+            },
+        )
+        .await
+        .unwrap_err();
+
+        assert!(matches!(error, WorkdirError::OutOfScope(path) if path == spill.path()));
+    }
+
+    #[tokio::test]
+    async fn truncated_command_output_is_retained_in_the_requested_spill_directory() {
+        let dir = TempDir::new().unwrap();
+        let spill = TempDir::new().unwrap();
+        let scope = Scope::from_config(&ScopeConfig {
+            allow: vec![
+                ScopeRule {
+                    target: dir.path().to_path_buf(),
+                    permission: Permission::Write,
+                    recursive: true,
+                },
+                ScopeRule {
+                    target: spill.path().to_path_buf(),
+                    permission: Permission::Read,
+                    recursive: true,
+                },
+            ],
+            deny: Vec::new(),
+        })
+        .unwrap();
+        let workdir = LocalWorkdirSession::new(scope, dir.path().to_path_buf());
+        let handle = WorkdirSession::start_command(
+            &workdir,
+            CommandRequest {
+                command: "i=0; while [ $i -lt 200 ]; do printf 'line-%03d\\n' \"$i\"; i=$((i+1)); done; printf 'FINAL-NEEDLE\\n'".into(),
+                timeout_secs: 5,
+                output_limit: 64,
+                spill_dir: Some(spill.path().to_path_buf()),
+                tool_call_id: None,
+            },
+        )
+        .await
+        .unwrap();
+        let output = WorkdirSession::command_output(
+            &workdir,
+            CommandOutputRequest {
+                handle,
+                cursor: 0,
+                limit: 4096,
+                wait: true,
+            },
+        )
+        .await
+        .unwrap();
+
+        assert!(output.truncated);
+        let output_path = output.output_path.expect("retained output path");
+        assert_eq!(output_path.parent(), Some(spill.path()));
+        let retained = std::fs::read_to_string(&output_path).unwrap();
+        assert!(retained.starts_with("line-000\n"));
+        assert!(retained.ends_with("FINAL-NEEDLE\n"));
+        assert_eq!(retained.lines().count(), 201);
+
+        #[cfg(unix)]
+        {
+            use std::os::unix::fs::PermissionsExt as _;
+            assert_eq!(
+                std::fs::metadata(output_path).unwrap().permissions().mode() & 0o777,
+                0o600
+            );
+        }
+    }
+
     #[tokio::test]
     async fn completed_command_output_can_be_read_in_bounded_unicode_pages() {
         let dir = TempDir::new().unwrap();
@@ -2001,6 +2224,7 @@ mod tests {
                 command: "printf 'aéz'".into(),
                 timeout_secs: 5,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: None,
             },
         )
@@ -2120,6 +2344,7 @@ mod tests {
                 content: "done".into(),
                 next_cursor: None,
                 truncated: false,
+                output_path: None,
             })
         });
         workdir.inner.commands.lock().await.insert(
@@ -2224,6 +2449,7 @@ mod tests {
                 command: "printf ready; printf warning >&2; sleep 0.2; printf done".into(),
                 timeout_secs: 5,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: Some("tool-7".into()),
             },
         )
@@ -2327,6 +2553,7 @@ mod tests {
                 command: "sleep 30".into(),
                 timeout_secs: 1,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: None,
             },
         )
@@ -2396,6 +2623,7 @@ mod tests {
                 command: "sleep 30".into(),
                 timeout_secs: 60,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: None,
             },
         )

crates/workdir/src/operation.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
@@ -9,6 +11,9 @@ pub struct CommandRequest {
     pub command: String,
     pub timeout_secs: u64,
     pub output_limit: usize,
+    /// Provider-local directory where complete output is retained when the
+    /// inline result exceeds `output_limit`.
+    pub spill_dir: Option<PathBuf>,
     /// Optional caller-owned correlation id. Bash supplies its tool-call id so
     /// user-facing command telemetry can update the corresponding Console row
     /// without exposing provider/session handles.
@@ -96,4 +101,6 @@ pub struct CommandOutput {
     pub content: String,
     pub next_cursor: Option<usize>,
     pub truncated: bool,
+    /// Complete output retained by the provider when `truncated` is true.
+    pub output_path: Option<PathBuf>,
 }

crates/worker-runtime/src/http_server.rs

@@ -703,6 +703,7 @@ async fn run_workdir_session_operation(
                     content: String::new(),
                     next_cursor: Some(cursor),
                     truncated: false,
+                    output_path: None,
                 },
             };
             WorkdirSessionOperationResult::CommandOutput(output)

crates/worker-runtime/src/worker_backend.rs

@@ -60,6 +60,7 @@ use worker::{
     Worker, WorkerBootstrap, WorkerBootstrapError, WorkerBootstrapLayout,
     WorkerControllerTransport, WorkerError, WorkerFilesystemAuthority, WorkerHandle,
     WorkerSharedState, WorkerWorkspaceContext, WorkspaceClient, WorkspaceId,
+    bash_output_dir_for_worker_id,
 };
 
 const DEFAULT_BACKEND_ID: &str = "worker-crate";
@@ -886,6 +887,7 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
         let run_dir = worker_aggregate_dir
             .join("runs")
             .join(request.run_generation.to_string());
+        let bash_output_dir = bash_output_dir_for_worker_id(&request.worker_ref.worker_id);
         let mut prepared = WorkerBootstrap::new(
             manifest,
             store,
@@ -894,6 +896,7 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
             filesystem_authority,
             WorkerBootstrapLayout::RuntimeManagedRun {
                 run_dir: run_dir.clone(),
+                bash_output_dir,
             },
             self.controller_transport,
         )
@@ -1131,10 +1134,12 @@ impl RuntimeWorkerFactory for ProfileRuntimeWorkerFactory {
         let run_dir = worker_aggregate_dir
             .join("runs")
             .join(request.run_generation.to_string());
+        let bash_output_dir = bash_output_dir_for_worker_id(&request.worker_ref.worker_id);
         let started = PreparedWorker::new(
             worker,
             WorkerBootstrapLayout::RuntimeManagedRun {
                 run_dir: run_dir.clone(),
+                bash_output_dir,
             },
             self.controller_transport,
         )
@@ -2552,10 +2557,14 @@ mod tests {
             )
             .await
             .map_err(|err| err.to_string())?;
-            let (handle, shutdown_rx) =
-                WorkerController::spawn_runtime_managed(worker, &self.runtime_base)
-                    .await
-                    .map_err(|err| err.to_string())?;
+            let bash_output_dir = self.runtime_base.join("bash-output");
+            let (handle, shutdown_rx) = WorkerController::spawn_runtime_managed(
+                worker,
+                &self.runtime_base,
+                &bash_output_dir,
+            )
+            .await
+            .map_err(|err| err.to_string())?;
             Ok(RuntimeWorkerController {
                 handle,
                 shutdown: Arc::new(tokio::sync::Mutex::new(Some(shutdown_rx))),

crates/worker/examples/worker_protocol.rs

@@ -47,7 +47,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let worker = worker::Worker::from_manifest_toml(&toml, store).await?;
 
     let runtime_tmp = tempfile::tempdir()?;
-    let (handle, _shutdown_rx) = WorkerController::spawn(worker, runtime_tmp.path()).await?;
+    let bash_output_dir = runtime_tmp.path().join("bash-output");
+    let (handle, _shutdown_rx) =
+        WorkerController::spawn(worker, runtime_tmp.path(), &bash_output_dir).await?;
 
     // Check initial status via shared state
     println!("[shared_state] {}", handle.shared_state.status_json());

crates/worker/src/bootstrap.rs

@@ -17,9 +17,28 @@ use manifest::WorkerManifest;
 #[derive(Debug, Clone)]
 pub enum WorkerBootstrapLayout {
     /// A direct Worker rooted below the supplied runtime base directory.
-    Direct { runtime_base: PathBuf },
+    Direct {
+        runtime_base: PathBuf,
+        bash_output_dir: PathBuf,
+    },
     /// A runtime-managed Worker with an exact persisted run directory.
-    RuntimeManagedRun { run_dir: PathBuf },
+    RuntimeManagedRun {
+        run_dir: PathBuf,
+        bash_output_dir: PathBuf,
+    },
+}
+
+/// Return the temporary Bash spill directory owned by a stable Worker identity.
+///
+/// The directory deliberately lives outside session/run-generation storage so a
+/// restarted controller for the same Worker keeps the same readable artifact
+/// boundary.
+pub fn bash_output_dir_for_worker_id(worker_id: impl std::fmt::Display) -> PathBuf {
+    std::env::temp_dir()
+        .join("yoi")
+        .join("workers")
+        .join(worker_id.to_string())
+        .join("bash-output")
 }
 
 /// Construction and controller inputs that are stable for one Worker launch.
@@ -204,12 +223,29 @@ where
 {
     let cleanup_session = worker.workdir_session().cloned();
     let controller = match layout {
-        WorkerBootstrapLayout::Direct { runtime_base } => {
-            WorkerController::spawn_with_transport(worker, &runtime_base, transport).await
+        WorkerBootstrapLayout::Direct {
+            runtime_base,
+            bash_output_dir,
+        } => {
+            WorkerController::spawn_with_transport(
+                worker,
+                &runtime_base,
+                &bash_output_dir,
+                transport,
+            )
+            .await
         }
-        WorkerBootstrapLayout::RuntimeManagedRun { run_dir } => {
-            WorkerController::spawn_runtime_managed_run_with_transport(worker, &run_dir, transport)
-                .await
+        WorkerBootstrapLayout::RuntimeManagedRun {
+            run_dir,
+            bash_output_dir,
+        } => {
+            WorkerController::spawn_runtime_managed_run_with_transport(
+                worker,
+                &run_dir,
+                &bash_output_dir,
+                transport,
+            )
+            .await
         }
     };
 
@@ -227,3 +263,22 @@ where
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::bash_output_dir_for_worker_id;
+
+    #[test]
+    fn bash_output_directory_is_stable_per_worker_below_system_temp() {
+        let path = bash_output_dir_for_worker_id("019c1234-worker");
+
+        assert_eq!(
+            path,
+            std::env::temp_dir()
+                .join("yoi")
+                .join("workers")
+                .join("019c1234-worker")
+                .join("bash-output")
+        );
+    }
+}

crates/worker/src/controller.rs

@@ -222,6 +222,7 @@ impl WorkerController {
     pub async fn spawn<C, St>(
         worker: Worker<C, St>,
         runtime_base: &Path,
+        bash_output_dir: &Path,
     ) -> Result<(WorkerHandle, ShutdownReceiver), std::io::Error>
     where
         C: LlmClient + Clone + 'static,
@@ -230,6 +231,7 @@ impl WorkerController {
         Self::spawn_inner(
             worker,
             runtime_base,
+            bash_output_dir,
             false,
             None,
             WorkerControllerTransport::UnixSocket,
@@ -242,24 +244,9 @@ impl WorkerController {
     pub async fn spawn_with_transport<C, St>(
         worker: Worker<C, St>,
         runtime_base: &Path,
+        bash_output_dir: &Path,
         transport: WorkerControllerTransport,
     ) -> Result<(WorkerHandle, ShutdownReceiver), std::io::Error>
-    where
-        C: LlmClient + Clone + 'static,
-        St: Store + WorkerMetadataStore + Clone + Send + Sync + 'static,
-    {
-        Self::spawn_inner(worker, runtime_base, false, None, transport).await
-    }
-
-    /// Spawn a Worker owned by `worker-runtime`.
-    ///
-    /// The controller still uses an ephemeral directory for Unix sockets and
-    /// tool spill artifacts, but does not write legacy pid/status/manifest
-    /// liveness projections.
-    pub async fn spawn_runtime_managed<C, St>(
-        worker: Worker<C, St>,
-        runtime_base: &Path,
-    ) -> Result<(WorkerHandle, ShutdownReceiver), std::io::Error>
     where
         C: LlmClient + Clone + 'static,
         St: Store + WorkerMetadataStore + Clone + Send + Sync + 'static,
@@ -267,6 +254,33 @@ impl WorkerController {
         Self::spawn_inner(
             worker,
             runtime_base,
+            bash_output_dir,
+            false,
+            None,
+            transport,
+        )
+        .await
+    }
+
+    /// Spawn a Worker owned by `worker-runtime`.
+    ///
+    /// The controller uses an ephemeral directory for Unix sockets while tool
+    /// spill artifacts use the separately supplied Worker-owned temporary path.
+    /// Runtime-managed Workers do not write legacy pid/status/manifest liveness
+    /// projections.
+    pub async fn spawn_runtime_managed<C, St>(
+        worker: Worker<C, St>,
+        runtime_base: &Path,
+        bash_output_dir: &Path,
+    ) -> Result<(WorkerHandle, ShutdownReceiver), std::io::Error>
+    where
+        C: LlmClient + Clone + 'static,
+        St: Store + WorkerMetadataStore + Clone + Send + Sync + 'static,
+    {
+        Self::spawn_inner(
+            worker,
+            runtime_base,
+            bash_output_dir,
             true,
             None,
             WorkerControllerTransport::UnixSocket,
@@ -278,6 +292,7 @@ impl WorkerController {
     pub async fn spawn_runtime_managed_run<C, St>(
         worker: Worker<C, St>,
         run_dir: &Path,
+        bash_output_dir: &Path,
     ) -> Result<(WorkerHandle, ShutdownReceiver), std::io::Error>
     where
         C: LlmClient + Clone + 'static,
@@ -286,6 +301,7 @@ impl WorkerController {
         Self::spawn_runtime_managed_run_with_transport(
             worker,
             run_dir,
+            bash_output_dir,
             WorkerControllerTransport::UnixSocket,
         )
         .await
@@ -296,6 +312,7 @@ impl WorkerController {
     pub async fn spawn_runtime_managed_run_with_transport<C, St>(
         worker: Worker<C, St>,
         run_dir: &Path,
+        bash_output_dir: &Path,
         transport: WorkerControllerTransport,
     ) -> Result<(WorkerHandle, ShutdownReceiver), std::io::Error>
     where
@@ -305,12 +322,21 @@ impl WorkerController {
         let parent = run_dir
             .parent()
             .ok_or_else(|| std::io::Error::other("run path has no parent"))?;
-        Self::spawn_inner(worker, parent, true, Some(run_dir), transport).await
+        Self::spawn_inner(
+            worker,
+            parent,
+            bash_output_dir,
+            true,
+            Some(run_dir),
+            transport,
+        )
+        .await
     }
 
     async fn spawn_inner<C, St>(
         worker: Worker<C, St>,
         runtime_base: &Path,
+        bash_output_dir: &Path,
         runtime_managed: bool,
         runtime_run: Option<&Path>,
         transport: WorkerControllerTransport,
@@ -323,6 +349,7 @@ impl WorkerController {
         let result = Self::spawn_initialized(
             worker,
             runtime_base,
+            bash_output_dir,
             runtime_managed,
             runtime_run,
             transport,
@@ -340,6 +367,7 @@ impl WorkerController {
     async fn spawn_initialized<C, St>(
         mut worker: Worker<C, St>,
         runtime_base: &Path,
+        bash_output_dir: &Path,
         runtime_managed: bool,
         runtime_run: Option<&Path>,
         transport: WorkerControllerTransport,
@@ -397,11 +425,11 @@ impl WorkerController {
         worker.attach_internal_worker_registry(spawned_registry.clone());
         worker.attach_working_event_tx(working_event_tx.clone());
 
-        // Bash spills long outputs to a per-worker subdir under the runtime
-        // dir. Push a recursive `allow(Read)` for that path into the
-        // Worker's runtime scope so the agent can `Read` saved files
-        // without polluting the workspace.
-        let bash_output_dir = runtime_dir.path().join("bash-output");
+        // Bash spill artifacts are owned by the stable Worker identity rather
+        // than a controller session/run generation. Push a recursive
+        // `allow(Read)` for the exact tool output path into the Worker's shared
+        // runtime scope so the Workdir session and system prompt stay aligned.
+        let bash_output_dir = bash_output_dir.to_path_buf();
         std::fs::create_dir_all(&bash_output_dir).map_err(|e| {
             std::io::Error::other(format!(
                 "create bash output dir {}: {e}",
@@ -880,7 +908,7 @@ where
             .register_tools(tools::core_builtin_tools(
                 workdir.clone(),
                 tracker.clone(),
-                bash_output_dir,
+                bash_output_dir.clone(),
             ));
         if feature_config.image.enabled && model_supports_image_attachments(&spawner_manifest.model)
         {
@@ -1103,6 +1131,7 @@ where
                 spawner_workspace_context,
                 parent_notifications,
                 runtime_base.clone(),
+                bash_output_dir.clone(),
                 spawner_workspace_root,
                 source_workdir_session,
                 spawned_registry.clone(),

crates/worker/src/entrypoint.rs

@@ -634,10 +634,12 @@ async fn run_cli_inner(cli: Cli) -> ExitCode {
             return ExitCode::FAILURE;
         }
     };
+    let bash_output_dir = crate::bash_output_dir_for_worker_id(&worker_name);
     let started = match start_worker_controller(
         worker,
         WorkerBootstrapLayout::Direct {
             runtime_base: runtime_base.clone(),
+            bash_output_dir,
         },
         WorkerControllerTransport::UnixSocket,
     )

crates/worker/src/lib.rs

@@ -27,7 +27,7 @@ mod worker;
 
 pub use bootstrap::{
     BootstrappedWorker, PreparedWorker, WorkerBootstrap, WorkerBootstrapError,
-    WorkerBootstrapLayout, start_worker_controller,
+    WorkerBootstrapLayout, bash_output_dir_for_worker_id, start_worker_controller,
 };
 pub use compact::token_counter::{EstimateSource, SplitPoint, TokenEstimate};
 pub use controller::{ShutdownReceiver, WorkerController, WorkerControllerTransport, WorkerHandle};

crates/worker/src/spawn/tool.rs

@@ -22,7 +22,7 @@ use manifest::{
 use serde::Deserialize;
 use tokio::sync::mpsc;
 use workdir::{
-    WorkdirDelegationPermission, WorkdirDelegationRequest, WorkdirDelegationRule,
+    WorkdirDelegationPermission, WorkdirDelegationRequest, WorkdirDelegationRule, WorkdirPath,
     WorkdirSessionHandle,
 };
 
@@ -258,9 +258,10 @@ pub struct SubWorkerSpawnTool {
     spawner_name: String,
     workspace_context: crate::worker::WorkerWorkspaceContext,
     parent_notifications: ParentNotificationTarget,
-    /// Runtime-owned root used only for bounded Internal Worker tool artifacts such as Bash spill
-    /// output. It is not an Internal Worker identity or catalog location.
+    /// Runtime-owned root used for Internal Worker controller state.
     runtime_base: PathBuf,
+    /// Parent Worker-owned temporary root used for bounded Bash spill output.
+    bash_output_dir: PathBuf,
     /// Inherited runtime workspace root for Profile/project/Ticket/workflow/
     /// memory context. SubWorkerSpawn `cwd` must not affect this value.
     workspace_root: PathBuf,
@@ -292,6 +293,7 @@ impl SubWorkerSpawnTool {
         workspace_context: crate::worker::WorkerWorkspaceContext,
         parent_notifications: ParentNotificationTarget,
         runtime_base: PathBuf,
+        bash_output_dir: PathBuf,
         workspace_root: PathBuf,
         source_workdir_session: Option<WorkdirSessionHandle>,
         registry: Arc<SpawnedWorkerRegistry>,
@@ -304,6 +306,7 @@ impl SubWorkerSpawnTool {
             workspace_context,
             parent_notifications,
             runtime_base,
+            bash_output_dir,
             workspace_root,
             source_workdir_session,
             registry,
@@ -367,7 +370,22 @@ impl Tool for SubWorkerSpawnTool {
             .reserve_internal_name(input.name.clone())
             .map_err(|error| ToolError::InvalidArgument(error.to_string()))?;
 
-        let workdir_rules = parse_workdir_scope(&input.scope)?;
+        let mut workdir_rules = parse_workdir_scope(&input.scope)?;
+        let child_bash_output_dir = self.bash_output_dir.join("sub-workers").join(&input.name);
+        tokio::fs::create_dir_all(&child_bash_output_dir)
+            .await
+            .map_err(|error| {
+                ToolError::ExecutionFailed(format!(
+                    "create Internal Worker Bash output directory {}: {error}",
+                    child_bash_output_dir.display()
+                ))
+            })?;
+        workdir_rules.push(WorkdirDelegationRule {
+            target: WorkdirPath::new_scoped(child_bash_output_dir.to_string_lossy())
+                .map_err(|error| ToolError::ExecutionFailed(error.to_string()))?,
+            permission: WorkdirDelegationPermission::Read,
+            recursive: true,
+        });
         let source_workdir_session =
             require_active_workdir_session(self.source_workdir_session.as_ref())?;
         let delegation_request = workdir_delegation_request(input.cwd.as_deref(), workdir_rules)?;
@@ -464,14 +482,22 @@ impl Tool for SubWorkerSpawnTool {
         .await
         .map_err(|error| ToolError::ExecutionFailed(format!("build Internal Worker: {error}")))?;
         child.bind_workdir_session(Some(workdir_delegation.scoped_session.clone()));
+        child
+            .add_scope_rules([ScopeRule {
+                target: child_bash_output_dir.clone(),
+                permission: manifest::Permission::Read,
+                recursive: true,
+            }])
+            .map_err(|error| {
+                ToolError::ExecutionFailed(format!(
+                    "grant Internal Worker Bash output scope: {error}"
+                ))
+            })?;
         let child_scope = child.scope().clone();
         let child_registry = SpawnedWorkerRegistry::new_internal(input.name.clone(), child_scope);
         register_worker_tools(
             &mut child,
-            self.runtime_base
-                .join("internal-workers")
-                .join(&input.name)
-                .join("bash-output"),
+            child_bash_output_dir,
             self.runtime_base.clone(),
             child_registry.clone(),
             None,
@@ -883,6 +909,7 @@ pub(crate) fn sub_worker_spawn_tool(
     workspace_context: crate::worker::WorkerWorkspaceContext,
     parent_notifications: ParentNotificationTarget,
     runtime_base: PathBuf,
+    bash_output_dir: PathBuf,
     workspace_root: PathBuf,
     source_workdir_session: Option<WorkdirSessionHandle>,
     registry: Arc<SpawnedWorkerRegistry>,
@@ -894,6 +921,7 @@ pub(crate) fn sub_worker_spawn_tool(
         workspace_context,
         parent_notifications,
         runtime_base,
+        bash_output_dir,
         workspace_root,
         source_workdir_session,
         registry,
@@ -907,6 +935,7 @@ fn sub_worker_spawn_tool_impl(
     workspace_context: crate::worker::WorkerWorkspaceContext,
     parent_notifications: ParentNotificationTarget,
     runtime_base: PathBuf,
+    bash_output_dir: PathBuf,
     workspace_root: PathBuf,
     source_workdir_session: Option<WorkdirSessionHandle>,
     registry: Arc<SpawnedWorkerRegistry>,
@@ -938,6 +967,7 @@ fn sub_worker_spawn_tool_impl(
             workspace_context.clone(),
             parent_notifications.clone(),
             runtime_base.clone(),
+            bash_output_dir.clone(),
             workspace_root.clone(),
             source_workdir_session.clone(),
             registry.clone(),
@@ -1082,12 +1112,17 @@ extract_threshold = 4000
     async fn reviewer_profile_write_scope_exposes_command_tools_and_notifies_parent_controller() {
         let runtime = TempDir::new().unwrap();
         let workspace_root = runtime.path().join("project");
+        let bash_output_dir = runtime.path().join("bash-output");
         let available_profiles = write_project_profile_registry(
             &workspace_root,
             Some("reviewer"),
             &[("reviewer", "reviewer.toml", INTERNAL_REVIEWER_PROFILE)],
         );
         let mut manifest = parent_manifest(&workspace_root, None);
+        manifest
+            .scope
+            .allow
+            .push(abs_rule(&bash_output_dir, Permission::Read));
         manifest.delegation_scope = ScopeConfig {
             allow: vec![abs_rule(&workspace_root, Permission::Write)],
             deny: Vec::new(),
@@ -1118,6 +1153,7 @@ extract_threshold = 4000
             workspace_context,
             ParentNotificationTarget::Controller(parent_method_tx.downgrade()),
             runtime.path().to_path_buf(),
+            bash_output_dir.clone(),
             workspace_root.clone(),
             Some(source_workdir_session),
             registry.clone(),
@@ -1167,6 +1203,12 @@ extract_threshold = 4000
             .await
             .expect("spawn project reviewer as Internal Worker");
         assert!(output.summary.contains("internal worker `reviewer-child`"));
+        assert!(
+            bash_output_dir
+                .join("sub-workers")
+                .join("reviewer-child")
+                .is_dir()
+        );
         assert!(spawner_scope.snapshot().is_writable(&workspace_root));
         let record = registry
             .get_internal("reviewer-child")

crates/worker/tests/compact_events_test.rs

@@ -861,7 +861,8 @@ async fn controller_compact_method_emits_start_and_done() {
     ]);
     let worker = make_worker_with_manifest(POST_RUN_MANIFEST_TOML, client).await;
     let runtime_tmp = tempfile::tempdir().unwrap();
-    let (handle, _shutdown) = WorkerController::spawn(worker, runtime_tmp.path())
+    let bash_output_dir = runtime_tmp.path().join("bash-output");
+    let (handle, _shutdown) = WorkerController::spawn(worker, runtime_tmp.path(), &bash_output_dir)
         .await
         .unwrap();
     let mut rx = handle.subscribe();

crates/worker/tests/controller_test.rs

@@ -276,12 +276,38 @@ async fn spawn_controller(worker: Worker<MockClient, TestStore>) -> WorkerHandle
     let tmp = tempfile::tempdir().unwrap();
     let runtime_base = tmp.path().to_owned();
     std::mem::forget(tmp);
-    let (handle, _shutdown_rx) = WorkerController::spawn(worker, &runtime_base)
+    let bash_output_dir = runtime_base.join("bash-output");
+    let (handle, _shutdown_rx) = WorkerController::spawn(worker, &runtime_base, &bash_output_dir)
         .await
         .unwrap();
     handle
 }
 
+#[tokio::test]
+async fn controller_grants_read_scope_for_exact_bash_output_directory() {
+    let worker = make_worker(MockClient::new(simple_text_events())).await;
+    let shared_scope = worker.scope().clone();
+    let runtime_base = tempfile::tempdir().unwrap();
+    let worker_tmp = tempfile::tempdir().unwrap();
+    let bash_output_dir = worker_tmp.path().join("worker-1").join("bash-output");
+
+    let (handle, shutdown_rx) =
+        WorkerController::spawn(worker, runtime_base.path(), &bash_output_dir)
+            .await
+            .unwrap();
+
+    assert!(bash_output_dir.is_dir());
+    assert!(shared_scope.snapshot().allow_rules().iter().any(|rule| {
+        rule.target == bash_output_dir
+            && rule.permission == manifest::Permission::Read
+            && rule.recursive
+    }));
+    assert!(!handle.runtime_dir.path().join("bash-output").exists());
+
+    handle.send(Method::Shutdown).await.unwrap();
+    shutdown_rx.await.unwrap();
+}
+
 #[tokio::test]
 async fn shutdown_closes_bound_workdir_session() {
     let (mut worker, pwd) = make_worker_with_pwd(MockClient::new(simple_text_events())).await;
@@ -297,6 +323,7 @@ async fn shutdown_closes_bound_workdir_session() {
             command: "sleep 30".to_owned(),
             timeout_secs: 60,
             output_limit: 1024,
+            spill_dir: None,
             tool_call_id: None,
         })
         .await
@@ -304,9 +331,11 @@ async fn shutdown_closes_bound_workdir_session() {
     worker.bind_workdir_session(Some(Arc::clone(&session)));
 
     let runtime_base = tempfile::tempdir().unwrap();
-    let (handle, shutdown_rx) = WorkerController::spawn(worker, runtime_base.path())
-        .await
-        .unwrap();
+    let bash_output_dir = runtime_base.path().join("bash-output");
+    let (handle, shutdown_rx) =
+        WorkerController::spawn(worker, runtime_base.path(), &bash_output_dir)
+            .await
+            .unwrap();
     handle.send(Method::Shutdown).await.unwrap();
     tokio::time::timeout(std::time::Duration::from_secs(5), shutdown_rx)
         .await
@@ -338,6 +367,7 @@ async fn controller_projects_workdir_command_events_and_snapshot_state() {
             command: "printf ready; sleep 0.3; printf done".to_owned(),
             timeout_secs: 5,
             output_limit: 1024,
+            spill_dir: None,
             tool_call_id: Some("tool-command-1".into()),
         })
         .await
@@ -445,6 +475,7 @@ async fn controller_refreshes_command_snapshot_after_high_output_provider_lag()
                 .to_owned(),
             timeout_secs: 10,
             output_limit: 1024,
+            spill_dir: None,
             tool_call_id: Some("tool-high-output".into()),
         })
         .await
@@ -508,8 +539,9 @@ async fn controller_startup_failure_closes_bound_workdir_session() {
     let invalid_runtime_base = runtime_base.path().join("not-a-directory");
     std::fs::write(&invalid_runtime_base, "file").unwrap();
 
+    let bash_output_dir = runtime_base.path().join("bash-output");
     assert!(
-        WorkerController::spawn(worker, &invalid_runtime_base)
+        WorkerController::spawn(worker, &invalid_runtime_base, &bash_output_dir)
             .await
             .is_err()
     );
@@ -519,6 +551,7 @@ async fn controller_startup_failure_closes_bound_workdir_session() {
                 command: "printf unreachable".to_owned(),
                 timeout_secs: 5,
                 output_limit: 1024,
+                spill_dir: None,
                 tool_call_id: None,
             })
             .await,
@@ -863,7 +896,8 @@ permission = "write"
     let client = MockClient::new(simple_text_events());
     let worker = make_worker_with_pwd_and_manifest(client, manifest).await.0;
     let tmp = tempfile::tempdir().unwrap();
-    let result = WorkerController::spawn(worker, tmp.path()).await;
+    let bash_output_dir = tmp.path().join("bash-output");
+    let result = WorkerController::spawn(worker, tmp.path(), &bash_output_dir).await;
     assert!(
         result.is_ok(),
         "feature exposure must not imply delegation authority"

crates/workspace-server/src/server.rs

@@ -15430,6 +15430,7 @@ mod tests {
                 command: "printf ready; sleep 30".to_string(),
                 timeout_secs: 60,
                 output_limit: 4096,
+                spill_dir: None,
                 tool_call_id: Some("tool-call-command-session".to_string()),
             })
             .await