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Mu MCP Server

A Model Context Protocol (MCP) server for querying your local [`mu`](https://github.com/djcb/mu) mail index. This server enables fast, structured

Local serverstdioPython

What is the Mu MCP MCP server?

If you want an AI assistant working directly with Mu MCP, the mu mcp mcp server is the bridge. A Model Context Protocol (MCP) server for querying your local mu mail index. This server enables fast, structured mail search from Claude Desktop and other MCP clients.

What Mu MCP does

A Model Context Protocol (MCP) server for querying your local mu mail index. This server enables fast, structured mail search from Claude Desktop and other MCP clients.

Key capabilities

  • Stdio MCP server — for easy integration
  • Three tools: — query, view emails and open attachments (using default OS viewer)
  • Fast, flexible mail search — using the mu index
  • Claude Desktop ready — simple installation and config
  • Python, pixi, and MCP SDK — based

Installing the mu mcp mcp server

Setup follows the standard MCP pattern: clone or install the server, then register it in your client's configuration file and restart the client. The configuration snippets on this page cover Claude Desktop, Claude Code and Cursor.

Configuration

The server reads one environment variable: PROJECT_PATH. Keep credentials in your client's env block or a secrets manager rather than committing them.

Where it fits

Developer-tool servers are usually the first ones people connect, because they turn "help me with this code" into an assistant that can actually read the repo and act on it. Mu MCP sits in that group. Worth comparing against the other developer tools servers in this directory before you commit to one, since several overlap in scope but differ sharply in setup cost and permissions.

Practical notes

  • This server runs locally, so it operates with whatever access your machine and its credentials already have. Scope that deliberately rather than by default.
  • Maintained by danielfleischer, written in Python.
  • MCP clients ask for confirmation before each tool call by default. Keep that on while you learn what the mu mcp mcp server actually does with your data.
  • Every entry in this directory is reviewed by hand before it goes live, and details are checked against the project's own documentation.

How to install the Mu MCP MCP server

"mcpServers": {
  "mu_mcp": {
    "command": "pixi",
    "args": [
      "run",
      "--manifest-path",
      "PROJECT_PATH",
      "start"
    ]
  }
}

Configuration as documented by the project. Restart the client after saving.

Configuration

VariableDescriptionRequired
PROJECT_PATHFilesystem location the server is allowed to use.Optional

Frequently asked questions

It connects Mu MCP to MCP-compatible AI assistants such as Claude and Cursor. Instead of copying data back and forth by hand, the assistant works with Mu MCP directly.

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