diff --git a/.yoi/tickets/00001KVXK0WE4/item.md b/.yoi/tickets/00001KVXK0WE4/item.md
index bc0d9593..67f1f70f 100644
--- a/.yoi/tickets/00001KVXK0WE4/item.md
+++ b/.yoi/tickets/00001KVXK0WE4/item.md
@@ -1,8 +1,8 @@
 ---
 title: 'Add host-owned WebSocket driver for Plugin services'
-state: 'queued'
+state: 'inprogress'
 created_at: '2026-06-24T19:51:56Z'
-updated_at: '2026-06-25T06:22:18Z'
+updated_at: '2026-06-25T06:23:16Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-24T20:12:03Z'
diff --git a/.yoi/tickets/00001KVXK0WE4/thread.md b/.yoi/tickets/00001KVXK0WE4/thread.md
index 81dfca6a..8d34d64b 100644
--- a/.yoi/tickets/00001KVXK0WE4/thread.md
+++ b/.yoi/tickets/00001KVXK0WE4/thread.md
@@ -111,3 +111,17 @@ Next action:
 - `queued -> inprogress` を記録してから worktree-workflow で `/home/hare/Projects/yoi/.worktree/00001KVXK0WE4-plugin-websocket-driver` を作成し、multi-agent-workflow で Coder/Reviewer sibling loop に進める。
 
 ---
+
+<!-- event: state_changed author: yoi-orchestrator at: 2026-06-25T06:23:16Z from: queued to: inprogress reason: orchestrator_acceptance_unblocked field: state -->
+
+## State changed
+
+Orchestrator acceptance: queued -> inprogress
+
+- 直前確認で `TicketShow` は state `queued`、derived blockers は空。
+- outgoing dependencies `00001KVXK0WDQ` と `00001KVXK0WDX` は done / merged / reviewed / validated 済み。
+- accepted plan `orch-plan-20260625-062148-3` を確認した。
+- routing decision と IntentPacket は Ticket thread に記録済み。
+- これ以降に worktree-workflow で `/home/hare/Projects/yoi/.worktree/00001KVXK0WE4-plugin-websocket-driver` を作成し、multi-agent-workflow に接続する。
+
+---