Max Isbey
ab24c34d89
- pre_parse_json leaves a string alone when json.loads refuses it with something other than JSONDecodeError (over-long integer, deep nesting), so validation rejects it as a bad argument instead of it surfacing as a crash with a traceback per request. - convert_result skips output-schema validation for a returned CallToolResult(is_error=True); an error result has no structured content to check, and the author's message now reaches the client as written. - read_resource checks that Resource.read() returned str or bytes, so a mistyped custom resource is logged as a crash and answered with -32603 rather than "Invalid request parameters" with no log record. - Docs and examples that still said "raise any exception and the model reads it" now say ToolError; deprecated.md lists the deprecated FuncMetadata helper; docstrings spell out the MCPError carve-out and the nested-crash __cause__. - Two tests tightened: the prompt argument-validation test proves the body never ran, and the invalid-types check asserts on validate_arguments.
36 lines
913 B
Python
36 lines
913 B
Python
from mcp.server import MCPServer
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from mcp.server.mcpserver.exceptions import ToolError
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mcp = MCPServer("Bookshop")
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CATALOG = {
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"Dune": "Frank Herbert",
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"Neuromancer": "William Gibson",
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"The Left Hand of Darkness": "Ursula K. Le Guin",
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}
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@mcp.tool()
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def search_books(query: str) -> list[str]:
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"""Search the catalog by title or author."""
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needle = query.lower()
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return [title for title, author in CATALOG.items() if needle in title.lower() or needle in author.lower()]
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@mcp.tool()
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def get_author(title: str) -> str:
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"""Look up the author of a book in the catalog."""
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if title not in CATALOG:
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raise ToolError(f"No book titled {title!r} in the catalog.")
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return CATALOG[title]
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@mcp.resource("catalog://titles")
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def titles() -> str:
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"""Every title in the catalog, one per line."""
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return "\n".join(sorted(CATALOG))
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if __name__ == "__main__":
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mcp.run()
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