MCP Gmail

Model Context Protocol server for Gmail integration. This allows Claude Desktop (or any MCP client) to interact with your Gmail account through Google Apps Script.

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Quick Start (For Users)

Prerequisites

• Node.js 18+ (install via brew install node)
• Gmail account
• Google Apps Script deployment
• Claude Desktop (install from https://claude.ai/desktop)

Configuration

1. Deploy the Google Apps Script

• Visit Google Apps Script and create a new project
• Copy the entire contents of code.gs and paste it into the script editor
• Click on "Deploy" > "New deployment"
• Select "Web app" as the deployment type
• Configure the following settings:
  • Execute as: Me
  • Who has access: Anyone
  • Click "Deploy"
• When prompted, review and authorize the app to access your Gmail account
• Copy the deployment URL and generate a random API key for security

Note: The script requires Gmail access permissions. When you first deploy and run the script, Google will ask you to review and grant these permissions. Make sure to:

1. Click "Review Permissions"

2. Select your Google account

3. Click "Advanced" if you see a warning

4. Click "Go to [Your Project Name] (unsafe)"

5. Click "Allow" to grant the necessary Gmail permissions

6. Open your Claude Desktop configuration file at: ~/Library/Application Support/Claude/claude_desktop_config.json

You can find this through the Claude Desktop menu:

1. Open Claude Desktop

2. Click Claude on the Mac menu bar

3. Click "Settings"

4. Click "Developer"

5. Add the following to your configuration:

{
  "tools": {
    "gmail": {
      "command": "npx",
      "args": ["-y", "@kazuph/mcp-gmail-gas"],
      "env": {
        "GAS_ENDPOINT": "YOUR_DEPLOYMENT_URL",
        "VALID_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Note: Replace YOUR_DEPLOYMENT_URL and YOUR_API_KEY with your actual values.

For Developers

Prerequisites

• Node.js 18+ (install via brew install node)
• Gmail account
• Google Apps Script
• Claude Desktop (install from https://claude.ai/desktop)
• tsx (install via npm install -g tsx)

Installation

git clone https://github.com/kazuph/mcp-gmail-gas.git
cd mcp-gmail-gas
npm install
npm run build

Development Configuration

1. Make sure Claude Desktop is installed and running.

2. Install tsx globally if you haven't:

npm install -g tsx
# or
pnpm add -g tsx

3. Modify your Claude Desktop config located at: ~/Library/Application Support/Claude/claude_desktop_config.json

Add the following to your MCP client's configuration:

{
  "tools": {
    "gmail": {
      "args": ["tsx", "/path/to/mcp-gmail-gas/index.ts"],
      "env": {
        "GAS_ENDPOINT": "YOUR_DEPLOYMENT_URL",
        "VALID_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Available Tools

• gmail_search_messages: Search for emails using Gmail search query syntax (e.g., "subject:Meeting newer_than:1d")
• gmail_get_message: Get the full content and details of a specific email
• gmail_download_attachment: Download an attachment from a specific email

Security Note

Always keep your VALID_API_KEY secret and never commit it to version control. This key helps ensure that only authorized clients can access your Gmail through the Google Apps Script deployment.