How do I install the mu mcp server?

Use a recorded configuration for your client, replace example credential values and paths, and verify the documented runtime. Restart or reconnect the client, then inspect the available tools.

What credentials does it need?

It reads `PROJECT_PATH` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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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 Server?

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

Practical notes

Maintained by danielfleischer, written in Python.

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

How to install the Mu MCP Server

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

Maintainer configuration example. Replace example paths and credential placeholders before connecting.

Configuration

Variable	Description	Required
PROJECT_PATH	Filesystem location the server is allowed to use.	Optional

Frequently asked questions

A Model Context Protocol (MCP) server for querying your local [`mu`](https://github.com/djcb/mu) mail index. This server enables fast, structured mail search from Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.