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Shows how to fix mcp-server-motherduck: cant set a custom S3 endpoint (IBM COS) for the database connection. Use it when you hit this exact problem. Skip it when your error message or symptom looks different.
A regression in the 0.7.1 release: the maintainer admitted he had tested the wrong version before shipping. The fix was released as 0.7.2 the same day. If youre stuck on 0.7.1, pin the working version in your MCP config until you can upgrade: ```json { "mcpServers": { "motherduck": { "command": "uvx", "args": ["mcp-se…
Problem outcome: unknown
After upgrading to mcp-server-motherduck 0.7.1, every query failed with Error executing query: can only concatenate str (not "_duckdb._sqltypes.DuckDBPyType") to str. Even SELECT 1 broke. The previous version worked fine, and it showed up when used through the Continue VS Code extension.
Problem outcome: unknown
The maintainer's take: pandas was only used for output formatting and was causing more problems than it solved. He shipped 0.5.1 which removes the pandas dependency problem. Workarounds if youre on an older version: That pins the last good pandas and worked …
Problem outcome: unknown
The DuckDB MCP server broke when pandas 2.3.0 came out, because pandas 2.3.0 failed to build on some platforms. Users on macOS ARM hit it hardest, and pinning pandas==2.2.3 via uvx worked as a workaround. The PyPI install of mcp-server-motherduck doesnt honor a lockfile, so it pulled the broken pandas and the server w…
Problem outcome: unknown
What this covers: Using the MotherDuck MCP server against an S3-compatible store (IBM Cloud Object Storage), there was no way to set a custom endpoint through the direct MCP connection. The fix that worked: Two things came out of the thread.
The default markdown result format goes through pandas, which misbehaves on Windows here. Two workarounds, both verified by the reporter: duckbox keeps the datatype info with limited output, or --result-format text if you dont need colu…
Problem outcome: unknown
Using the in-memory DuckDB MCP server in VS Code (Augment Code extension) on Windows, every query tool call hung forever. The same setup on WSL returned fine. The reporter noticed the default output format is markdown, which renders through pandas, and switching to duckbox or text formats made the tool work on Win…
Problem outcome: unknown
Two things came out of the thread. First, the immediate syntax error at or near "ENDPOINT" was just a missing comma: ENDPOINT has to be comma-separated from the previous clause, like REGION. ```sql CREATE SECRET ( TYPE S3, KEY_ID '...', SECRET '...', REGION 'us-south', ENDPOINT 's3.us-south.cloud-object-storage.appd…
Problem outcome: unknown
Using the MotherDuck MCP server against an S3-compatible store (IBM Cloud Object Storage), there was no way to set a custom endpoint through the direct MCP connection. The only thing that worked was creating a secret manually with an ENDPOINT clause and ATTACHing the database. The reporter's first attempt at a CREATE …
Problem outcome: unknown
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: ```json { "mcpServers"…
Problem outcome: unknown
Setting up the MotherDuck MCP server with Claude Desktop (access token plus home directory path per the README) wouldnt connect. The Claude log showed the server crashing on startup with TypeError: main() got an unexpected keyword argument 'result_format'. Downgrading to mcp-server-motherduck==0.3.0 made it work, so…
Problem outcome: unknown