diff --git a/.yoi/tickets/00001KX6Y2A9Q/artifacts/orchestration-plan.jsonl b/.yoi/tickets/00001KX6Y2A9Q/artifacts/orchestration-plan.jsonl
new file mode 100644
index 00000000..4522660f
--- /dev/null
+++ b/.yoi/tickets/00001KX6Y2A9Q/artifacts/orchestration-plan.jsonl
@@ -0,0 +1 @@
+{"id":"orch-plan-20260710-215118-1","ticket_id":"00001KX6Y2A9Q","kind":"accepted_plan","accepted_plan":{"summary":"Introduce explicit `WorkerFilesystemAuthority` with `None` and `Local(LocalWorkingDirectory)` variants, remove Worker-level `cwd` field/accessor, gate core filesystem tools/Bash on local filesystem authority, and update constructor/restore/embedded/spawn paths plus tests so no-workdir Workers have no filesystem tool surface or cwd fallback.","branch":"work/00001KX6Y2A9Q-worker-filesystem-authority","worktree":"/home/hare/Projects/yoi/.worktree/00001KX6Y2A9Q-worker-filesystem-authority","role_plan":"Orchestrator accepts queued Ticket after inspecting current Ticket, relations, orchestration plan, inprogress queue, and clean orchestration worktree. Use sibling Coder for implementation in a dedicated worktree, then sibling Reviewer for read-only review. Orchestrator retains merge/final-validation/close/cleanup authority."},"author":"orchestrator","at":"2026-07-10T21:51:18Z"}
diff --git a/.yoi/tickets/00001KX6Y2A9Q/item.md b/.yoi/tickets/00001KX6Y2A9Q/item.md
index 0e4c42f7..f50d8f9b 100644
--- a/.yoi/tickets/00001KX6Y2A9Q/item.md
+++ b/.yoi/tickets/00001KX6Y2A9Q/item.md
@@ -1,9 +1,9 @@
 ---
 title: 'Implement WorkerFilesystemAuthority for no-workdir Workers'
-state: 'queued'
+state: 'inprogress'
 priority: 'P1'
 created_at: '2026-07-10T21:13:49Z'
-updated_at: '2026-07-10T21:51:00Z'
+updated_at: '2026-07-10T21:51:33Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-07-10T21:51:00Z'
diff --git a/.yoi/tickets/00001KX6Y2A9Q/thread.md b/.yoi/tickets/00001KX6Y2A9Q/thread.md
index 0e35a790..350aec5e 100644
--- a/.yoi/tickets/00001KX6Y2A9Q/thread.md
+++ b/.yoi/tickets/00001KX6Y2A9Q/thread.md
@@ -63,4 +63,41 @@ Marked ready by `yoi ticket state`.
 Ticket を `workspace-panel` が queued にしました。
 
 
+---
+
+<!-- event: decision author: orchestrator at: 2026-07-10T21:51:29Z -->
+
+## Decision
+
+Routing decision: accept for implementation
+
+Evidence checked:
+- Ticket `00001KX6Y2A9Q` is `queued` and has a concrete implementation scope。
+- `TicketRelationQuery(00001KX6Y2A9Q)` shows incoming dependents (`00001KX6WVNPD`, `00001KX6Y6ZEA`) but no outgoing unresolved blockers for this Ticket。
+- `TicketOrchestrationPlanQuery(00001KX6Y2A9Q)` had no prior plan; accepted plan was recorded in this routing pass。
+- `TicketList(inprogress)` shows 0 inprogress Tickets。
+- Orchestrator worktree `/home/hare/Projects/yoi/.worktree/orchestration` is clean。
+
+Accepted plan:
+- Create dedicated implementation worktree `/home/hare/Projects/yoi/.worktree/00001KX6Y2A9Q-worker-filesystem-authority` from current orchestration branch。
+- Use branch `work/00001KX6Y2A9Q-worker-filesystem-authority`。
+- Route implementation to sibling Coder Pod, then external review to sibling Reviewer Pod。
+- Orchestrator retains merge, final validation, Ticket close, and child worktree/branch cleanup authority。
+
+Implementation focus:
+- Add explicit `WorkerFilesystemAuthority` with no-workdir `None` and local `Local(LocalWorkingDirectory)` representation。
+- Remove Worker-level `cwd: PathBuf` field and `worker.cwd()` accessor。
+- Gate core filesystem tools and Bash on `WorkerFilesystemAuthority::Local`; no-workdir Workers must not register those tools。
+- Update constructor / restore / embedded / child-spawn paths to pass filesystem authority explicitly。
+- Separate workspace context from filesystem authority; do not use workspace root / process cwd / runtime cwd fallback as no-workdir authority。
+- Add tests for no-workdir model-visible tool surface and execution construction behavior, plus grep/equivalent assurance that `worker.cwd()` usages are gone。
+
+---
+
+<!-- event: state_changed author: orchestrator at: 2026-07-10T21:51:33Z from: queued to: inprogress reason: accepted_for_implementation field: state -->
+
+## State changed
+
+Dashboard queue authorization was inspected, no blockers were found, and an accepted plan was recorded. Moving queued Ticket to inprogress before creating implementation worktree or spawning Pods.
+
 ---