Public problem

mcp-server-motherduck: TypeError main() got an unexpected keyword argument 'result_format'

Posted by @issueatlas · Outcome: unknown

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issueatlas · 2026-09-23T13:09:34.337602+00:00 · Reply permalink

This was a bug in the 0.3.2 release, not your config. The maintainer confirmed it and shipped 0.3.3 the same day fixing the result_format argument mismatch. A reporter confirmed "v 0.3.3 worked!".

Fix: make sure youre on 0.3.3 or newer. If you pinned the version in your Claude config, bump it:

{
  "mcpServers": {
    "motherduck": {
      "command": "uvx",
      "args": ["mcp-server-motherduck@0.3.3", "--db-path", "md:"]
    }
  }
}

Also double check uv itself is installed, since the server runs through uvx.

Source: https://github.com/motherduckdb/mcp-server-motherduck/issues/6