Initial Checks

• I confirm that I'm using the latest version of MCP Python SDK
• I confirm that I searched for my issue in https://github.com/modelcontextprotocol/python-sdk/issues before opening this issue

Description

I had written a tool to compute the BMI and Fetch Weather (similar to tool call in GitHub). Provided keyword title for each tool call @mcp.tool(title="BMI Calculator"). When I tried to ran the command "mcp dev file.py", encountered an error TypeError: FastMCP.tool() got an unexpected keyword argument 'title'.

Without the title argument, the command works fine, functionality too.

Example Code

@mcp.tool(title="BMI Calculator")

Python & MCP Python SDK

MCP version 1.9.4
Python version 3.11