How to use Langgraph by local LLM and local API

[CJunHub]

I am based on https://python.langchain.com/docs/modules/model_io/chat/custom_chat_model/
The example rewrites the _call method
Modified model=ChatOpenAI (temperature=0) to local llm model=MyLLM (n=5)
According to the official graph example, it can run normally after writing, but
1、tool cannot be called up
2、Answering messages is also a HumanMessage, not an AiMessage

Running results：

smith results：
https://smith.langchain.com/public/215b0a62-a1c2-4b0e-950f-e6c484335ebb/r

请问是否需要修改本地llm返回格式
能否给出一个本地127.0.0.1:xxx/api 的demo