Google Calendar MCP Server

🗓️ Google Calendar MCP Server

I got tired of the Google Cloud setup BS, so I built this.

Connect your calendar in 30 seconds, not 3 hours.

Skip the OAuth nightmare. No Google Cloud Console. No service accounts. No headaches. Just works with Claude Desktop, Cursor, Zed, or whatever MCP client you're using.

✨ Why This Rocks

• 🚀 Actually Easy Setup - 30 seconds vs 3 hours of Google Cloud hell
• 🔒 OAuth That Works - No token management headaches
• 🔧 Works Everywhere - Claude, Cursor, Zed... if it does MCP, we got you
• ⚡ Deploy & Forget - One-click Vercel deployment
• 🗓️ Full Calendar Power - Create, edit, delete events like a boss
• 🌐 Your Server - Host it yourself, own your data
• 📱 Test Drive - Web UI to make sure everything works before going live

Just Want to Use It?

1. Connect your calendar:
   • Go to https://cal-mcp.com
   • Hit "Connect Google Calendar"
   • Do the OAuth dance
   • Copy your config
2. Add to your MCP client:Option A: Streamable HTTP (Recommended)
   { "mcpServers": { "google-calendar": { "url": "https://cal-mcp.com/api/mcp" } } }
   Option B: STDIO (Local Server)
   { "mcpServers": { "google-calendar": { "command": "npx", "args": ["-y", "mcp-remote", "https://cal-mcp.com/api/mcp"] } } }

Want to Run Your Own?

1. Grab the code:
   git clone https://github.com/progrmoiz/cal-mcp cd cal-mcp npm install
2. Google OAuth setup (yeah, still need this part):
   • Hit up Google Cloud Console
   • Make a project (or use an existing one)
   • Enable Google Calendar API
   • Create OAuth 2.0 credentials
   • Add this redirect URI: http://localhost:3000/api/auth/callback/google
3. Environment variables:
   cp .env.example .env.local
   Drop in your Google stuff:
   GOOGLE_CLIENT_ID=your_client_id GOOGLE_CLIENT_SECRET=your_client_secret BETTER_AUTH_SECRET=any_random_string BETTER_AUTH_URL=http://localhost:3000
4. Fire it up:
   npm run dev
5. Connect your calendar:
   • Go to http://localhost:3000
   • Hit "Connect Google Calendar"
   • Do the OAuth dance
   • Copy your config

🧪 Test Drive

Built-in web interface because who wants to debug blind?

• Play with Events - Create, edit, delete events right in the browser
• OAuth Testing - Make sure the auth flow actually works
• Debug Mode - See raw API responses when things go sideways
• Sanity Check - Verify everything works before plugging into your AI

Hit http://localhost:3000 once you're running and give it a spin.

What You Can Do

All the calendar stuff you'd expect:

• list-calendars - See all your calendars
• list-events - Get events for a date range
• create-event - Make new events
• update-event - Change existing events
• delete-event - Remove events
• search-events - Find events by text
• get-event - Get event details
• move-event - Move events between calendars
• list-colors - Get color options for calendars/events
• get-freebusy - Check when you're available
• get-current-time - Current time and timezone info

For Builders

What's under the hood:

• Better Auth handling the OAuth mess
• MCP server that actually works
• Next.js for the web stuff
• TypeScript because we're not animals

Going Live

Ready to deploy? Here's what you need:

1. Environment Variables - Set them on your hosting platform
2. Database - Point to your Neon PostgreSQL URL
3. Google OAuth - Update redirect URIs for your domain
4. HTTPS - Because OAuth demands it

Security Stuff

• Better Auth handles tokens so you don't have to
• Secrets stay in environment variables where they belong
• Everything needs auth (obviously)
• Token refresh happens automatically

🛠️ When Things Break

Stuff not working? Try these:

Your AI Tool Doesn't Do MCP

Not all AI tools support MCP yet. Check if yours does before pulling your hair out.

Remote Connections Failing

Some tools do MCP but hate remote servers. Use the STDIO config instead.

OAuth Acting Up

Did you actually complete the Google login? Try connecting again from the homepage.

No MCP Support At All

Bug your AI tool's developers to add MCP support. The more people ask, the faster it happens.

🛠️ Architecture

Built with modern technologies for reliability and ease of use:

• Next.js 15 - Full-stack framework with API routes
• Better Auth - Secure OAuth 2.0 authentication
• MCP Handler - Model Context Protocol server implementation
• Google Calendar API - Direct integration with Google's calendar services
• Vercel - Serverless deployment platform
• TypeScript - Type-safe development

🤝 Want to Help?

Contributions welcome! Here's how:

1. 🐛 Found a Bug? - Open an issue, tell us what broke
2. 💡 Got Ideas? - Issues are perfect for brainstorming
3. 🔧 Can Code? - PRs for fixes and features always welcome
4. 📖 Hate Bad Docs? - Make them better!
5. 🧪 Just Testing? - Feedback is gold

How to Contribute:

1. Fork it
2. Branch it: git checkout -b feature/cool-thing
3. Code it (and test it!)
4. PR it with a good description

If you want to contribute, here are some ideas worth tackling:

• 📊 Google Sheets MCP - Spreadsheets meet AI (imagine the possibilities!)
• 📧 Gmail MCP - Email automation that doesn't suck
• ☁️ Google Drive MCP - File management for the AI era
• 📝 Google Docs MCP - Collaborative writing with AI superpowers

Other Calendar Providers:

• 📅 Outlook/Microsoft 365 - Because not everyone lives in Google land
• 🍎 Apple Calendar (CalDAV) - For the Mac enthusiasts

Got another idea? Just build it!

The beauty of this setup is that it's dead simple to extend. Copy the auth flow, swap the API endpoints, and boom - you've got yourself a new MCP server.

Feel free to fork this repo and create a pull request. Let's build the future of productivity tools together, one API at a time. 🛠️

📄 License

MIT License - do whatever you want with it.

💬 Need Help?

• 📖 Docs: This README + code comments
• 🐛 Bugs: GitHub Issues
• 💬 Questions: GitHub Discussions
• 📧 Collaboration: Hit me up