python-sdk/docs_src/middleware/tutorial001.py at main · stophobia/python-sdk · GitHub

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import logging

import time

from mcp.server import Server, ServerRequestContext

from mcp.server.context import CallNext, HandlerResult

from mcp.types import (

CallToolRequestParams,

CallToolResult,

ListToolsResult,

PaginatedRequestParams,

TextContent,

Tool,

)

logger = logging.getLogger(__name__)

async def on_list_tools(ctx: ServerRequestContext, params: PaginatedRequestParams | None) -> ListToolsResult:

return ListToolsResult(

tools=[

Tool(

name="search_books",

description="Search the catalog by title or author.",

input_schema={

"type": "object",

"properties": {"query": {"type": "string"}},

"required": ["query"],

)

]

)

async def on_call_tool(ctx: ServerRequestContext, params: CallToolRequestParams) -> CallToolResult:

query = (params.arguments or {})["query"]

return CallToolResult(content=[TextContent(type="text", text=f"Found 3 books matching {query!r}.")])

async def log_timing(ctx: ServerRequestContext, call_next: CallNext) -> HandlerResult:

start = time.perf_counter()

try:

return await call_next(ctx)

finally:

elapsed_ms = (time.perf_counter() - start) * 1000

logger.info("%s took %.1f ms", ctx.method, elapsed_ms)

server = Server("Bookshop", on_list_tools=on_list_tools, on_call_tool=on_call_tool)

server.middleware.append(log_timing)

python-sdk/docs_src/middleware/tutorial001.py at main · stophobia/python-sdk · GitHub

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