Merge pull request #677 from LibraSco/main

Update 第七章 构建你的Agent框架.md

docs/chapter7/第七章 构建你的Agent框架.md

@@ -617,7 +617,7 @@ SimpleAgent是最基础的Agent实现，它展示了如何在框架基础上构
 ```python
 # my_simple_agent.py
 from typing import Optional, Iterator
-from hello_agents import SimpleAgent, HelloAgentsLLM, Config, Message
+from hello_agents import SimpleAgent, HelloAgentsLLM, Config, Message,ToolRegistry
 
 class MySimpleAgent(SimpleAgent):
     """