diff --git a/agent-ui/.sync-state.json b/agent-ui/.sync-state.json
new file mode 100644
index 0000000..bd5fa81
--- /dev/null
+++ b/agent-ui/.sync-state.json
@@ -0,0 +1,26 @@
+{
+  "last_synced_head": "e86af4058e19618fe1580b54244918f965ce4d51",
+  "last_sync_mode": "baseline",
+  "baseline_mode": "migration",
+  "agent_ui_paths": [
+    "agent-ui/README.md",
+    "agent-ui/definition/index.md",
+    "agent-ui/definition/views/index.md",
+    "agent-ui/definition/views/workbench-shell/index.md",
+    "agent-ui/definition/views/workspace-home/index.md",
+    "agent-ui/definition/components/index.md",
+    "agent-ui/definition/components/activity-rail/index.md",
+    "agent-ui/definition/components/agent-dock-panel/index.md",
+    "agent-ui/definition/components/proto-socket-diagnostics/index.md",
+    "agent-ui/definition/components/status-chip/index.md",
+    "agent-ui/definition/components/workbench-titlebar/index.md",
+    "agent-ui/definition/components/workspace-list/index.md",
+    "agent-ui/definition/components/workspace-task-list/index.md",
+    "agent-ui/frame/index.md",
+    "agent-ui/definition/archive/views/.gitkeep",
+    "agent-ui/definition/archive/components/.gitkeep",
+    "agent-ui/archive/user-review/.gitkeep"
+  ],
+  "code_paths": [],
+  "notes": "Legacy agent-ui baseline migration. No code sync performed."
+}