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Point imports of mcp.server.fastmcp at the migration guide (#3388)
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Max 2026-08-25 16:39:57 +01:00 • committed by GitHub
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"""Removed in mcp 2: `FastMCP` is now `mcp.server.mcpserver.MCPServer`.
This module has no API. Importing it, or anything below it, raises
`ModuleNotFoundError` with a message that points at the migration guide. It
exists only because the bare "No module named 'mcp.server.fastmcp'" gave v1
code no hint that the installed SDK is a different major version.
"""
_MESSAGE = (
"No module named 'mcp.server.fastmcp'. This is mcp 2.x, where FastMCP was renamed to MCPServer "
"(from mcp.server.mcpserver import MCPServer) and other APIs changed; see the migration guide at "
"https://py.sdk.modelcontextprotocol.io/v2/migration/#fastmcp-renamed-to-mcpserver "
"or pin 'mcp<2' to keep running v1 code."
)
raise ModuleNotFoundError(_MESSAGE, name=__name__)