Gmail Attachment MCP Server

A server that provides a microservice for downloading Gmail attachments using the Message Control Protocol (MCP).

Overview

This project implements a FastMCP server that allows you to download attachments from Gmail messages using a message ID. It uses IMAP to connect to Gmail and fetch the attachments.

Features

• Download attachments from Gmail messages using message ID
• Secure connection to Gmail using IMAP over SSL
• Environment variable configuration for credentials
• Simple API interface through MCP

Prerequisites

• Python 3.7 or higher
• uv needs to be installed
• Gmail account with IMAP enabled
• App Password for Gmail (if using 2-Step Verification)

Installation

# Clone the repository
git clone https://github.com/yourusername/gmail-attachment-mcp-server.git
cd gmail-attachment-mcp-server

# Install dependencies
uv sync

Configuration

Set the following environment variables:

export GMAIL_USERNAME="[email protected]"
export GMAIL_PASSWORD="your_app_password"
export GMAIL_IMAP_SERVER="imap.gmail.com" # Optional, defaults to imap.gmail.com

Note: For Gmail, you should use an App Password instead of your regular password. See Google's documentation for more information.

Usage

Starting the server

python server.py
# or
mcp run server.py

Using the tool

The server exposes a download_attachments_tool that accepts the following parameters:

• message_id: The Gmail message ID in hexadecimal format
• download_folder: (Optional) The folder to download attachments to (defaults to "./attachments")

The function returns a list of paths to the downloaded attachment files.

using with mcp inspector

npx @modelcontextprotocol/inspector uv run mcp run server.py

using with goose

extensions:
  gmail-attachment-mcp-server:
    args:
      - run
      - /path to virtual env/.venv/bin/mcp
      - run
      - /path to gmail-attachment-mcp-server/server.py
    bundled: null
    cmd: uv
    description: null
    enabled: true
    env_keys:
      - GMAIL_USERNAME
      - GMAIL_PASSWORD
    envs: {}
    name: gmail-attachment-mcp-server
    timeout: 300
    type: stdio

API Reference

download_attachments_tool

download_attachments_tool(message_id: str, download_folder="./attachments") -> list[str]

Downloads attachments from a Gmail message identified by its message ID.

Parameters:

• message_id: The Gmail message ID in hexadecimal format
• download_folder: (Optional) The folder to download attachments to (defaults to "./attachments")

Returns:

• A list of strings containing the file paths of downloaded attachments

License

MIT