Google Docs MCP Server (Next.js)

A remote Model Context Protocol (MCP) server that provides Google Docs integration for Claude Desktop, built with Next.js and deployed on Vercel.

Features

• Remote MCP Server: Deployed on Vercel with SSE transport

• Google OAuth: Secure authentication with Google Docs and Drive permissions

• Web Dashboard: User-friendly interface for managing API keys

• Multi-user: Support for multiple users with isolated access

• API Key Management: Secure token-based authentication for MCP clients

Architecture

User Browser → Next.js App → Google OAuth → Database (User/Tokens)
Claude Desktop → MCP SSE Transport → API Key Auth → Google APIs

Setup

1. Google Cloud Console Setup

1. Create a new project in Google Cloud Console

2. Enable Google Docs API and Google Drive API

3. Create OAuth 2.0 credentials:

   • Application type: Web application

   • Authorized redirect URIs: https://your-app.vercel.app/api/auth/callback/google

4. Copy Client ID and Client Secret

2. Database Setup

Create a PostgreSQL database (recommended: Neon or Supabase)

3. Redis Setup

Create a Redis instance (required for Vercel MCP adapter). Recommended: Upstash

4. Deploy to Vercel

1. Fork this repository

2. Import to Vercel

3. Add environment variables:

   NEXTAUTH_SECRET=your-random-secret
   NEXTAUTH_URL=https://your-app.vercel.app
   GOOGLE_CLIENT_ID=your-google-client-id
   GOOGLE_CLIENT_SECRET=your-google-client-secret
   DATABASE_URL=your-postgresql-url
   REDIS_URL=your-redis-url

4. Deploy

5. Initialize Database

After deployment, run database migrations:

pnpm db:push

Usage

Simple Setup (OAuth-on-Demand)

1. Add MCP server to Claude Desktop (no setup required):

claude mcp add --transport sse google-docs https://your-app.vercel.app/sse

Or manually add to claude_desktop_config.json:

{
  "mcpServers": {
    "google-docs": {
      "command": "claude",
      "args": ["mcp", "connect", "sse", "https://your-app.vercel.app/sse"]
    }
  }
}

2. First-time authorization:

   • In Claude Desktop, run: "Use the authorize_google tool"

   • Claude will provide an authorization link

   • Click the link → browser opens → sign in with Google

   • After authorization, all Google Docs tools work automatically

3. Available Tools:

   • authorize_google - Authorize Google Docs access (run this first)

   • read_document - Read content from Google Docs

   • create_document - Create new Google Docs

   • update_document - Update document content with batch operations

   • append_text - Append text to documents

   • list_documents - List your Google Docs

Alternative: API Key Setup (Advanced)

For programmatic access or multiple clients:

1. Web Setup:

   • Visit your deployed app: https://your-app.vercel.app

   • Sign in with Google

   • Create an API key

2. Claude Desktop Setup:

claude mcp add --transport sse google-docs \\
  https://your-app.vercel.app/sse \\
  --header "X-API-Key: your-api-key"

Development

Local Setup

1. Clone the repository

2. Install dependencies: pnpm install

3. Copy .env.example to .env and fill in values

4. Run database migrations: pnpm db:push

5. Start development server: pnpm dev

Commands

• pnpm dev - Start development server

• pnpm build - Build for production

• pnpm start - Start production server

• pnpm lint - Run ESLint

• pnpm db:generate - Generate database migrations

• pnpm db:push - Push schema to database

• pnpm db:studio - Open Drizzle Studio

Security

• API keys are hashed before storage

• Google refresh tokens are encrypted in database

• User isolation prevents cross-user access

• HTTPS enforced for OAuth callbacks

Troubleshooting

Common Issues

1. OAuth Error: Check redirect URI matches exactly

2. Database Connection: Verify DATABASE_URL format

3. API Key Invalid: Ensure X-API-Key header is set correctly

4. Redis Connection: Verify REDIS_URL for SSE transport

Logs

Check Vercel function logs for detailed error information.

Contributing

1. Fork the repository

2. Create a feature branch

3. Make changes

4. Test locally

5. Submit a pull request

License

MIT License - see LICENSE file for details.