diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/conversation/directCodexConversation.ts b/apps/ai-game-creator-shell/src/view/project-development/chat/conversation/directCodexConversation.ts
index 2d662afe9..0285a1692 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/conversation/directCodexConversation.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/conversation/directCodexConversation.ts
@@ -91,6 +91,10 @@ export function readDirectTurnRejection(
  *
  * 名单只放"用户自己就能改、且不需要宿主诊断"的变体：`environmentNotReady` /
  * `hostStateUnavailable` 这类是宿主 / 环境事实，必须走上报通道，所以不在这里。
+ *
+ * 空文案按"没有提示"处理：这个函数要么给一条能显示的话，要么给 `null`——宿主给不出可展示的文案
+ * 时返回 `null`，而不是让调用方拿到一条空串（`''` 显示不出任何东西，却会被按 `!== null` 判据的
+ * 调用方当成"有提示"）。
  */
 export function directTurnRejectionNotice(
   rejection: DirectTurnRejection,
@@ -104,7 +108,7 @@ export function directTurnRejectionNotice(
     case 'permissionRejected':
     case 'inputRejected':
     case 'contentEmpty':
-      return rejection.message.trim();
+      return rejection.message.trim() || null;
     default:
       return null;
   }