core.py

# Agent系统最底层最核心的循环, 其他所有逻辑围绕这个循环逐步扩展
def agent_loop(messages):
    while True:
        response = client.messages.create(
            model=MODEL, 
            system=SYSTEM,
            messages=messages,
            tools=TOOLS,
        )
        messages.append({"role": "assistant",
                         "content": response.content})
 
        if response.stop_reason != "tool_use":
            return
 
        results = []
        for block in response.content:
            if block.type == "tool_use":
                output = TOOL_HANDLERS[block.name](**block.input)
                results.append({
                    "type": "tool_result",
                    "tool_use_id": block.id,
                    "content": output,
                })
        messages.append({"role": "user", "content": results})