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82 lines
2.5 KiB
Python
82 lines
2.5 KiB
Python
"""Run from the repository root:
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uv run examples/snippets/servers/lowlevel/structured_output.py
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"""
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import asyncio
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import json
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import mcp_types as types
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import mcp.server.stdio
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from mcp.server import Server, ServerRequestContext
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async def handle_list_tools(
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ctx: ServerRequestContext, params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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"""List available tools with structured output schemas."""
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return types.ListToolsResult(
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tools=[
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types.Tool(
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name="get_weather",
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description="Get current weather for a city",
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input_schema={
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"type": "object",
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"properties": {"city": {"type": "string", "description": "City name"}},
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"required": ["city"],
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},
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output_schema={
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"type": "object",
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"properties": {
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"temperature": {"type": "number", "description": "Temperature in Celsius"},
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"condition": {"type": "string", "description": "Weather condition"},
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"humidity": {"type": "number", "description": "Humidity percentage"},
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"city": {"type": "string", "description": "City name"},
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},
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"required": ["temperature", "condition", "humidity", "city"],
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},
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)
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]
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)
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async def handle_call_tool(ctx: ServerRequestContext, params: types.CallToolRequestParams) -> types.CallToolResult:
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"""Handle tool calls with structured output."""
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if params.name == "get_weather":
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city = (params.arguments or {})["city"]
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weather_data = {
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"temperature": 22.5,
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"condition": "partly cloudy",
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"humidity": 65,
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"city": city,
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}
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return types.CallToolResult(
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content=[types.TextContent(type="text", text=json.dumps(weather_data, indent=2))],
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structured_content=weather_data,
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)
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raise ValueError(f"Unknown tool: {params.name}")
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server = Server(
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"example-server",
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on_list_tools=handle_list_tools,
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on_call_tool=handle_call_tool,
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)
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async def run():
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"""Run the structured output server."""
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async with mcp.server.stdio.stdio_server() as (read_stream, write_stream):
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await server.run(
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read_stream,
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write_stream,
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server.create_initialization_options(),
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)
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if __name__ == "__main__":
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asyncio.run(run())
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