import asyncio
from typing import Any
from claude_agent_sdk import (
ClaudeAgentOptions,
ClaudeSDKClient,
create_sdk_mcp_server,
tool,
)
from langsmith.integrations.claude_agent_sdk import configure_claude_agent_sdk
configure_claude_agent_sdk()
@tool(
"get_weather",
"Gets the current weather for a given city",
{"city": str},
)
async def get_weather(args: dict[str, Any]) -> dict[str, Any]:
city = args["city"]
weather_data = {
"San Francisco": "Foggy, 62°F",
"New York": "Sunny, 75°F",
"London": "Rainy, 55°F",
"Tokyo": "Clear, 68°F",
}
weather = weather_data.get(city, "Weather data not available")
return {"content": [{"type": "text", "text": f"Weather in {city}: {weather}"}]}
async def main() -> None:
weather_server = create_sdk_mcp_server(
name="weather",
version="1.0.0",
tools=[get_weather],
)
options = ClaudeAgentOptions(
model="claude-sonnet-4-5-20250929",
system_prompt="You are a friendly travel assistant who helps with weather information.",
mcp_servers={"weather": weather_server},
allowed_tools=["mcp__weather__get_weather"],
)
async with ClaudeSDKClient(options=options) as client:
await client.query("What's the weather like in San Francisco and Tokyo?")
async for message in client.receive_response():
print(message)
if __name__ == "__main__":
asyncio.run(main())
