Google Workspace MCP Server

A generic Model Context Protocol (MCP) server that enables AI agents to securely interact with Google Workspace services. The server exposes tools for sending emails via Gmail and appending content to Google Docs.

It is built with Express and SSE Transport, making it perfect for cloud deployments (like Railway) so remote AI agents can connect over HTTP.

Features

• send_email: Send an email (Supports To, CC, BCC, HTML, Reply-To).

• append_to_google_doc: Append text to an existing Google Document.

Related MCP server: Google Workspace MCP Server

Setup Instructions

1. Google Cloud Console Setup

1. Create a project in Google Cloud Console.

2. Enable the Gmail API and Google Docs API.

3. Create OAuth 2.0 Client IDs (Desktop application type).

4. Download the credentials and save them as credentials.json in the root of this project.

2. Generate Tokens

1. Install dependencies:

   npm install

2. Run the token generation script:

   npm run auth

3. Follow the CLI prompt to authorize the application. The tokens will be saved locally and output a Refresh Token.

3. Deploy to Railway (Cloud Hosting)

1. Push this repository to your GitHub account.

2. Sign in to Railway.app and create a New Project from your GitHub Repository.

3. In the Railway Dashboard for this service, navigate to Variables and add the following:

   • GOOGLE_CLIENT_ID: Your Client ID

   • GOOGLE_CLIENT_SECRET: Your Client Secret

   • GOOGLE_REFRESH_TOKEN: The Refresh Token generated in Step 2.

   • API_KEY: Generate a secure random string (e.g., a UUID). This protects your server from unauthorized access!

Railway will automatically build and deploy the server. Once deployed, note the public Domain provided by Railway.

Integrating with AI Agents

Since this is an SSE-based server, your agent needs to connect to the /sse endpoint via HTTP, passing the API Key as a Bearer token.

For an MCP Client that supports SSE natively, configure it with:

• URL: https://your-railway-app-url.up.railway.app/sse

• Headers: {"Authorization": "Bearer YOUR_API_KEY"}