Fetch MCP fails with `McpError.__init__() takes 2 positional arguments but 3 were given`

[0anton]

Concerning: https://github.com/docker/mcp-servers/tree/main/src/fetch

I'm trying to fetch https://github.com/python/mypy/tags

The server fails with the error:

McpError.__init__() takes 2 positional arguments but 3 were given

Repro:

1. Start server using npx @modelcontextprotocol/inspector uvx mcp-server-fetch
2. Try to fetch the URL above.