创建第一个agent

1、初始化工具1.1 将上一节创建的工具放到common中from langchain_core.promptsimportChatMessagePromptTemplate, ChatPromptTemplate from langchain_openaiimportChatOpenAI from pydanticimportSecretStr, Field, BaseModel from langchain_core.toolsimporttool llm=ChatOpenAI(model="qwen3.7-plus-2026-05-26",base_url