diff --git a/modules/sub_agent/toolkit.py b/modules/sub_agent/toolkit.py
index 7e8e39a..79a87a5 100644
--- a/modules/sub_agent/toolkit.py
+++ b/modules/sub_agent/toolkit.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+from datetime import datetime
 from typing import Any, Dict, List, Optional
 
 # 子智能体可用工具定义（与前端进度展示兼容）