diff --git a/.yoi/tickets/00001KTVJGC0Y/item.md b/.yoi/tickets/00001KTVJGC0Y/item.md
index 535758e9..c59f1589 100644
--- a/.yoi/tickets/00001KTVJGC0Y/item.md
+++ b/.yoi/tickets/00001KTVJGC0Y/item.md
@@ -1,8 +1,8 @@
 ---
 title: 'Ticket language guidance must apply to all Ticket tool users'
-state: 'done'
+state: 'closed'
 created_at: '2026-06-11T14:48:44Z'
-updated_at: '2026-06-12T15:19:29Z'
+updated_at: '2026-06-12T15:20:11Z'
 assignee: null
 readiness: 'implementation_ready'
 risk_flags: ['prompt-context', 'tool-description', 'feature-boundary', 'ticket-language', 'companion']
diff --git a/.yoi/tickets/00001KTVJGC0Y/resolution.md b/.yoi/tickets/00001KTVJGC0Y/resolution.md
new file mode 100644
index 00000000..fa7a6ab4
--- /dev/null
+++ b/.yoi/tickets/00001KTVJGC0Y/resolution.md
@@ -0,0 +1,35 @@
+Ticket tool users 全体に `ticket.language` guidance が届くようにした。
+
+実装概要:
+- `crates/ticket/src/tool.rs` に shared `ticket_tool_description(name, record_language)` を追加し、configured `ticket.language` がある場合は Ticket tool description に durable Ticket record / Ticket tool body language guidance を追加するようにした。
+- `crates/pod/src/feature/builtin/ticket.rs` の builtin Ticket feature `ToolDeclaration` descriptions でも同じ helper を使い、read-only Companion-style context と lifecycle/Ticket-role-style context の両方に guidance が届くようにした。
+- guidance は `worker.language` / `memory.language` / `ticket.language` を区別し、protocol literals、file paths、commands、logs、identifiers、quoted external text は fidelity 優先で保持することを明記した。
+- guidance は Ticket tool / capability surface で model-visible であり、hidden context injection や `ticket_role` launch prompt fragment ではない。
+- Companion/read-only authority や mutating tool exposure は拡大していない。
+
+Review / integration:
+- Implementation commit: `92c4dee7 ticket: guide Ticket tool language universally`
+- Reviewer: `yoi-reviewer-ticket-language-guidance` が approve。
+- Orchestrator merge commit: `ec66cad8 merge: ticket language guidance for tool users`
+- Ticket completion commit: `2ba97b67 ticket: mark language guidance done`
+
+Validation:
+- `cargo test -p ticket ticket_record_language_guidance`: pass
+- `cargo test -p pod ticket_language_guidance`: pass
+- `cargo test -p client ticket_record_language_stays_out_of_first_run_text`: pass
+- `cargo test -p ticket`: pass, 68 tests
+- `cargo fmt --check`: pass
+- `git diff --check HEAD~1..HEAD`: pass
+- `./result/bin/yoi ticket doctor`: `doctor: ok`
+- `nix build .#yoi`: pass
+
+Known unrelated validation failure:
+- `cargo test -p pod` still includes pre-existing failures in Pod orchestration guidance prompt assertion tests. These were verified on the Orchestrator branch before merge and reviewed as unrelated to this Ticket.
+
+Cleanup:
+- coder/reviewer Pods stopped。
+- child worktree `/home/hare/Projects/yoi/.worktree/ticket-language-guidance-all-tools` removed。
+- branch `ticket/ticket-language-guidance-all-tools` deleted。
+
+Non-blocking risk:
+- configured language guidance is appended to every Ticket tool description, including read-only tools. This repeats some prompt text, but it is the accepted universal capability-surface tradeoff for this Ticket.
\ No newline at end of file
diff --git a/.yoi/tickets/00001KTVJGC0Y/thread.md b/.yoi/tickets/00001KTVJGC0Y/thread.md
index c98c97b8..aa02127a 100644
--- a/.yoi/tickets/00001KTVJGC0Y/thread.md
+++ b/.yoi/tickets/00001KTVJGC0Y/thread.md
@@ -296,3 +296,70 @@ Remaining non-blocking risk:
 Implementation was merged into the Orchestrator branch, reviewer approved with no blockers, and post-integration validation passed. Cleanup and closure will be recorded next.
 
 ---
+
+<!-- event: implementation_report author: orchestrator at: 2026-06-12T15:19:54Z -->
+
+## Implementation report
+
+Cleanup completed.
+
+- Stopped coder Pod: `yoi-coder-ticket-language-guidance`
+- Stopped reviewer Pod: `yoi-reviewer-ticket-language-guidance`
+- Removed child worktree: `/home/hare/Projects/yoi/.worktree/ticket-language-guidance-all-tools`
+- Deleted implementation branch: `ticket/ticket-language-guidance-all-tools`
+- Orchestrator worktree status after cleanup: clean
+
+Cleanup was limited to child implementation worktree/branch and related child Pods. Root/original workspace was not touched.
+
+---
+
+<!-- event: state_changed author: hare at: 2026-06-12T15:20:11Z from: done to: closed reason: closed field: state -->
+
+## State changed
+
+Ticket を closed にしました。
+
+
+---
+
+<!-- event: close author: hare at: 2026-06-12T15:20:11Z status: closed -->
+
+## 完了
+
+Ticket tool users 全体に `ticket.language` guidance が届くようにした。
+
+実装概要:
+- `crates/ticket/src/tool.rs` に shared `ticket_tool_description(name, record_language)` を追加し、configured `ticket.language` がある場合は Ticket tool description に durable Ticket record / Ticket tool body language guidance を追加するようにした。
+- `crates/pod/src/feature/builtin/ticket.rs` の builtin Ticket feature `ToolDeclaration` descriptions でも同じ helper を使い、read-only Companion-style context と lifecycle/Ticket-role-style context の両方に guidance が届くようにした。
+- guidance は `worker.language` / `memory.language` / `ticket.language` を区別し、protocol literals、file paths、commands、logs、identifiers、quoted external text は fidelity 優先で保持することを明記した。
+- guidance は Ticket tool / capability surface で model-visible であり、hidden context injection や `ticket_role` launch prompt fragment ではない。
+- Companion/read-only authority や mutating tool exposure は拡大していない。
+
+Review / integration:
+- Implementation commit: `92c4dee7 ticket: guide Ticket tool language universally`
+- Reviewer: `yoi-reviewer-ticket-language-guidance` が approve。
+- Orchestrator merge commit: `ec66cad8 merge: ticket language guidance for tool users`
+- Ticket completion commit: `2ba97b67 ticket: mark language guidance done`
+
+Validation:
+- `cargo test -p ticket ticket_record_language_guidance`: pass
+- `cargo test -p pod ticket_language_guidance`: pass
+- `cargo test -p client ticket_record_language_stays_out_of_first_run_text`: pass
+- `cargo test -p ticket`: pass, 68 tests
+- `cargo fmt --check`: pass
+- `git diff --check HEAD~1..HEAD`: pass
+- `./result/bin/yoi ticket doctor`: `doctor: ok`
+- `nix build .#yoi`: pass
+
+Known unrelated validation failure:
+- `cargo test -p pod` still includes pre-existing failures in Pod orchestration guidance prompt assertion tests. These were verified on the Orchestrator branch before merge and reviewed as unrelated to this Ticket.
+
+Cleanup:
+- coder/reviewer Pods stopped。
+- child worktree `/home/hare/Projects/yoi/.worktree/ticket-language-guidance-all-tools` removed。
+- branch `ticket/ticket-language-guidance-all-tools` deleted。
+
+Non-blocking risk:
+- configured language guidance is appended to every Ticket tool description, including read-only tools. This repeats some prompt text, but it is the accepted universal capability-surface tradeoff for this Ticket.
+
+---