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51 lines (36 loc) · 1.46 KB
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from collections.abc import AsyncIterator
from contextlib import asynccontextmanager
from dataclasses import dataclass
from mcp_types import (
CallToolRequestParams,
CallToolResult,
ListToolsResult,
PaginatedRequestParams,
TextContent,
Tool,
)
from mcp.server import Server, ServerRequestContext
@dataclass
class Catalog:
books: list[str]
def search(self, query: str) -> list[str]:
return [title for title in self.books if query.lower() in title.lower()]
@asynccontextmanager
async def lifespan(server: Server[Catalog]) -> AsyncIterator[Catalog]:
yield Catalog(books=["Dune", "Dune Messiah", "Children of Dune"])
SEARCH_BOOKS = Tool(
name="search_books",
description="Search the catalog by title or author.",
input_schema={
"type": "object",
"properties": {"query": {"type": "string"}},
"required": ["query"],
},
)
async def list_tools(ctx: ServerRequestContext[Catalog], params: PaginatedRequestParams | None) -> ListToolsResult:
return ListToolsResult(tools=[SEARCH_BOOKS])
async def call_tool(ctx: ServerRequestContext[Catalog], params: CallToolRequestParams) -> CallToolResult:
matches = ctx.lifespan_context.search((params.arguments or {})["query"])
text = f"Found {len(matches)} books: {', '.join(matches)}."
return CallToolResult(content=[TextContent(type="text", text=text)])
server = Server("Bookshop", lifespan=lifespan, on_list_tools=list_tools, on_call_tool=call_tool)