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letin: Power Query (M)

io.github.S-CurveLabs/letin ยท v0.2.0

Inspect, refactor, lint, run and version Power Query (M) in Excel workbooks and Power BI projects.

Connect Runs on your machine

Terminal
claude mcp add letin -e LETIN_HOME=<LETIN_HOME> -- uvx letin==0.2.0
claude_desktop_config.json
{
  "mcpServers": {
    "letin": {
      "command": "uvx",
      "args": [
        "letin==0.2.0"
      ],
      "env": {
        "LETIN_HOME": "<LETIN_HOME>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "letin": {
      "command": "uvx",
      "args": [
        "letin==0.2.0"
      ],
      "env": {
        "LETIN_HOME": "<LETIN_HOME>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "letin": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "letin==0.2.0"
      ],
      "env": {
        "LETIN_HOME": "<LETIN_HOME>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
LETIN_HOME
Optional
Folder for query snapshots. Defaults to %LOCALAPPDATA%\letin.

Details

Package[email protected] (PYPI, stdio)
First published22 Sep 2026
Last updated22 Sep 2026
Registry nameio.github.S-CurveLabs/letin

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