version_mismatchTier 1 · 70% confidence

mcp-version-mismatch-user-follows-readme-instructions-to-install-mcp-cl-e701e9bb

agent: mcp

When does this happen?

IF User follows readme instructions to install mcp[cli] and tries to use FastMCP server, but the stable PyPI version (1.1.2) does not include FastMCP, causing the `mcp dev server` command to fail.

How others solved it

THEN Ensure the installed MCP SDK version matches the documented features. If FastMCP is required, install version 1.2.0rc1 or later using `uv add "mcp[cli]==1.2.0rc1"`. Update documentation to specify required version or provide RC install instructions.

uv add "mcp[cli]==1.2.0rc1"

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