diff --git a/apps/ai-game-creator-shell/src/App.tsx b/apps/ai-game-creator-shell/src/App.tsx
index d5a6c705e..e8f3754a3 100644
--- a/apps/ai-game-creator-shell/src/App.tsx
+++ b/apps/ai-game-creator-shell/src/App.tsx
@@ -866,6 +866,12 @@ export function App({
   }
 
   function designAgentEventSubscriptionReady() {
+    // 业务动作只读取当前订阅代次；清理与下一次 effect 建立之间不能创建
+    // 一个没有订阅 effect 接管的悬挂 promise。
+    return designAgentEventSubscriptionReadyRef.current ?? Promise.resolve();
+  }
+
+  function createDesignAgentEventSubscriptionReady() {
     if (!designAgentEventSubscriptionReadyRef.current) {
       designAgentEventSubscriptionReadyRef.current = new Promise<void>(
         (resolve) => {
@@ -2106,12 +2112,13 @@ export function App({
   }, [planningV2Active]);
 
   useEffect(() => {
-    const ready = designAgentEventSubscriptionReady();
+    const ready = createDesignAgentEventSubscriptionReady();
     if (!canSubscribeTauriEvents() || !planningV2Active) {
       resolveDesignAgentEventSubscriptionReady();
       return () => {
         if (designAgentEventSubscriptionReadyRef.current === ready) {
           designAgentEventSubscriptionReadyRef.current = null;
+          createDesignAgentEventSubscriptionReady();
         }
       };
     }
@@ -2168,6 +2175,7 @@ export function App({
       resolveDesignAgentEventSubscriptionReady();
       if (designAgentEventSubscriptionReadyRef.current === ready) {
         designAgentEventSubscriptionReadyRef.current = null;
+        createDesignAgentEventSubscriptionReady();
       }
     };
     // applyDesignView 读的是 refs 和当前项目路径，