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Availability of the meta parameter in tool definition on the server #1462
Description
Description
Summary
It would be great if the SDK supported passing a meta field when defining tools, allowing developers to include additional metadata directly in the tool decorator.
Motivation
Currently, the SDK does not support passing a meta field during tool definition, limiting flexibility for attaching structured metadata such as descriptions, categories, or configuration details.
For example
from mcp.server import fastmcp
mcp = fastmcp.FastMCP(...)
@mcp.tool(meta={...})
def my_tool():
...Comparison
In the latest version of the FastMCP package, this functionality is already supported:
from fastmcp import FastMCP
mcp = FastMCP(...)
@mcp.tool(meta={...})
def my_tool():
...Expected behavior
The server SDK should support the meta argument when defining tools, consistent with the FastMCP implementation.
References
No response
Activity
felixweinberger commentedon Oct 10, 2025
We have some ongoing work on Meta tags, see https://github.com/modelcontextprotocol/python-sdk/milestone/16
Any of those address what you need here?
gabteixeira commentedon Oct 10, 2025
Yes! This #1463 is exactly what I need.