1-langgraph-demo

1. 安装

1.1 环境准备

• 我使用的是python 3.12

1.2 安装

pip install -U langgraph "langchain[anthropic]"

1.3 简单使用

from langgraph.prebuilt import create_react_agent

def get_weather(city: str) -> str:  
    """Get weather for a given city."""
    return f"It's always sunny in {city}!"

agent = create_react_agent(
    model="anthropic:claude-3-7-sonnet-latest",  
    tools=[get_weather],  
    prompt="You are a helpful assistant"  
)

# Run the agent
agent.invoke(
    {"messages": [{"role": "user", "content": "what is the weather in sf"}]}
)

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