diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools.rs
index a40e23674..7954fea9d 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools.rs
@@ -34,6 +34,8 @@ pub(in crate::agent) use project_ops::*;
 pub(in crate::agent) use run_status::*;
 pub(in crate::agent) use task_ops::*;
 
+#[cfg(test)]
+pub(crate) use delegation::observe_agent_runtime_agent_delegate_at_locked;
 #[cfg(test)]
 pub(crate) use delivery::{
     build_static_delegate_result_for_child_at, wake_waiting_static_delegate_parent_run_for_test_at,
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/collaboration/delegation.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/collaboration/delegation.rs
index 13ce2dca3..7e321f4c9 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/collaboration/delegation.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/collaboration/delegation.rs
@@ -2501,12 +2501,18 @@ fn autonomous_direct_child_collaboration_mutations_require_the_current_root() {
     );
 
     let action_id = "stale-direct-child-delegate";
+    // 本文件这四处「先持项目写锁、再调 agent.delegate」的用例走 `_at_locked`，不走同名薄壳。
+    // 薄壳在 M1C-2b（`152cc40c7`）里被改成入口自取项目写锁——把锁的所有权上提，是为了让
+    // planning 子 session 的投影按 project -> session 的顺序取锁。而 `.agent/project.lock` 是
+    // `create_new(true)` 的文件锁、不可重入：调用方已持锁再进薄壳，会死等满 10s 预算然后报
+    // 「无法取得一致项目快照」。生产侧两个调用方（`action_execution.rs`、`pending_recovery.rs`）
+    // 也都是持锁后调 `_at_locked`，薄壳如今已无生产调用方；用 `_at_locked` 钉的才是真实形状。
     let project_lock = acquire_game_creator_agent_runtime_project_write_lock_with_wait(
         &root,
         "test.stale-direct-child-delegate",
     )
     .expect("acquire delegate project lock");
-    let stale_delegate = observe_agent_runtime_agent_delegate(
+    let stale_delegate = observe_agent_runtime_agent_delegate_at_locked(
         &root,
         child_agent_id,
         &child_run_id,
@@ -2516,6 +2522,7 @@ fn autonomous_direct_child_collaboration_mutations_require_the_current_root() {
             "task": "旧根 child 不得创建委派",
             "runId": "stale-direct-child-target"
         }),
+        &project_lock,
     );
     drop(project_lock);
     assert_eq!(stale_delegate.status, "failed", "{stale_delegate:?}");
@@ -2574,7 +2581,7 @@ fn autonomous_delegate_descendant_inherits_and_enforces_the_current_root_guard()
         "test.current-descendant-delegate",
     )
     .expect("acquire current descendant delegate project lock");
-    let delegated = observe_agent_runtime_agent_delegate(
+    let delegated = observe_agent_runtime_agent_delegate_at_locked(
         &root,
         ready_agent_id,
         &ready_run_id,
@@ -2584,6 +2591,7 @@ fn autonomous_delegate_descendant_inherits_and_enforces_the_current_root_guard()
             "task": "在当前自主根下执行只读质量检查",
             "runId": descendant_run_id
         }),
+        &project_lock,
     );
     drop(project_lock);
     assert_eq!(delegated.status, "ok", "{delegated:?}");
@@ -2667,7 +2675,7 @@ fn autonomous_delegate_descendant_inherits_and_enforces_the_current_root_guard()
         "test.stale-descendant-delegate",
     )
     .expect("acquire descendant delegate project lock");
-    let stale_delegate = observe_agent_runtime_agent_delegate(
+    let stale_delegate = observe_agent_runtime_agent_delegate_at_locked(
         &root,
         descendant_agent_id,
         descendant_run_id,
@@ -2677,6 +2685,7 @@ fn autonomous_delegate_descendant_inherits_and_enforces_the_current_root_guard()
             "task": "旧根 descendant 不得继续派生",
             "runId": "stale-descendant-target"
         }),
+        &project_lock,
     );
     drop(project_lock);
     assert_eq!(stale_delegate.status, "failed", "{stale_delegate:?}");
@@ -2728,7 +2737,7 @@ fn standard_delegate_collaboration_mutations_remain_compatible() {
         "test.standard-delegate",
     )
     .expect("acquire standard delegate project lock");
-    let delegated = observe_agent_runtime_agent_delegate(
+    let delegated = observe_agent_runtime_agent_delegate_at_locked(
         &root,
         parent_agent_id,
         parent_run_id,
@@ -2738,6 +2747,7 @@ fn standard_delegate_collaboration_mutations_remain_compatible() {
             "task": "标准 Run 的兼容委派",
             "runId": "standard-delegate-child"
         }),
+        &project_lock,
     );
     drop(project_lock);
     assert_eq!(delegated.status, "ok", "{delegated:?}");