diff --git a/.yoi/tickets/00001KW55B33H/item.md b/.yoi/tickets/00001KW55B33H/item.md
index 5474d4a8..d354c552 100644
--- a/.yoi/tickets/00001KW55B33H/item.md
+++ b/.yoi/tickets/00001KW55B33H/item.md
@@ -2,7 +2,7 @@
 title: 'Workspace Companionを実LLM実行Workerとして起動する'
 state: 'inprogress'
 created_at: '2026-06-27T18:26:47Z'
-updated_at: '2026-06-28T06:09:52Z'
+updated_at: '2026-06-28T06:20:33Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-27T19:06:32Z'
diff --git a/.yoi/tickets/00001KW55B33H/thread.md b/.yoi/tickets/00001KW55B33H/thread.md
index eefc8151..c3179482 100644
--- a/.yoi/tickets/00001KW55B33H/thread.md
+++ b/.yoi/tickets/00001KW55B33H/thread.md
@@ -136,3 +136,36 @@ Operational response:
 - The replacement Coder should read the Ticket and current code directly from the worktree rather than receiving the full requirement text in the initial prompt.
 
 ---
+
+<!-- event: implementation_report author: yoi-coder-00001KW55B33H-companion-2 at: 2026-06-28T06:20:33Z -->
+
+## Implementation report
+
+Implementation/verification report:
+
+Replacement Coder completed a verification pass in the child worktree. No code changes were made and no implementation commit was created beyond the branch baseline.
+
+Reported branch/head:
+- `0c5a769aa90744cf12299c6d301ebfb3186d763f ticket: accept workspace companion llm worker`
+
+Reported outcome:
+- Existing code after upstream `00001KW55B33B` appears to satisfy this Ticket's main implementation goal.
+- Workspace Companion is visible as an embedded Runtime normal Worker.
+- The `worker` runtime-adapter path is used; providerless/fake responses were not found.
+- Input unavailable state is represented through Worker input-capable/diagnostic projection.
+- Workspace web Worker Console uses `runtime_id + worker_id` routing.
+
+Reported validation:
+- `cargo fmt --check`: success
+- `cd web/workspace && deno task test`: success
+- `cd web/workspace && deno task check`: success
+- `cd web/workspace && deno task build`: success
+- `cargo test -p yoi-workspace-server`: success
+- `cargo check -p yoi`: success
+- `git diff --check`: success
+- `nix build .#yoi`: success
+
+Orchestrator note:
+- Because no code commit was produced for this Ticket, a reviewer will be asked to explicitly verify whether upstream merged implementation fully satisfies `00001KW55B33H` or whether additional changes are required.
+
+---