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from typing import Annotated, Literal

from pydantic import Field

from mcp.server import MCPServer

mcp = MCPServer("Bookshop")

@mcp.tool()

def search_books(

query: Annotated[str, Field(description="Title or author to search for.")],

limit: Annotated[int, Field(ge=1, le=50, description="Maximum number of results.")] = 10,

genre: Literal["fiction", "non-fiction", "poetry"] | None = None,

) -> str:

"""Search the catalog by title or author."""

where = f" in {genre}" if genre else ""

return f"Found 3 books matching {query!r}{where} (showing up to {limit})."