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SmartVoyage/demo/function_call/_@tool.py
liangfangxing 0b087df55e feat: mcp
2026-03-20 11:26:44 +08:00

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from langchain_openai import ChatOpenAI
from langchain_core.messages import HumanMessage, ToolMessage
from langchain_core.tools import tool
from conf import settings
# todo: 第一步:定义工具函数
@tool
def add(a: int, b: int) -> int:
"""
将数字a与数字b相加
Args:
a: 第一个数字
b: 第二个数字
"""
return a + b
@tool
def multiply(a: int, b: int) -> int:
"""
将数字a与数字b相乘
Args:
a: 第一个数字
b: 第二个数字
"""
return a * b
# 定义 JSON 格式的工具 schema
tools = [add, multiply]
# todo: 第二步:初始化模型
llm = ChatOpenAI(
base_url=settings.base_url,
api_key=settings.api_key,
model=settings.model_name,
temperature=0.1
)
# 绑定工具,允许模型自动选择工具
llm_with_tools = llm.bind_tools(tools, tool_choice="auto")
# todo: 第三步:调用回复
query = "2+1等于多少"
messages = [HumanMessage(query)]
try:
# todo: 第一次调用
ai_msg = llm_with_tools.invoke(messages)
messages.append(ai_msg)
print(f"\n第一轮调用后结果:\n{messages}")
# 处理工具调用
# 判断消息中是否有tool_calls以判断工具是否被调用
if hasattr(ai_msg, 'tool_calls') and ai_msg.tool_calls:
for tool_call in ai_msg.tool_calls:
# todo: 处理工具调用
selected_tool = {"add": add, "multiply": multiply}[tool_call["name"].lower()]
tool_output = selected_tool.invoke(tool_call["args"]) # 需要使用invoke进行调用
messages.append(ToolMessage(content=tool_output, tool_call_id=tool_call["id"]))
print(f"\n第二轮 message中增加tool_output 之后:\n{messages}")
# todo: 第二次调用,将工具结果传回模型以生成最终回答
final_response = llm_with_tools.invoke(messages)
print(f"\n最终模型响应:\n{final_response.content}")
else:
print("模型未生成工具调用,直接返回文本:")
print(ai_msg.content)
except Exception as e:
print(f"模型调用失败: {str(e)}")