Calendar MCP Server

A Model Context Protocol (MCP) server for Google Calendar integration in Claude Desktop. This server enables AI assistants to manage Google Calendar events through natural language interactions.

Features

Create calendar events with title, time, description, and location
Retrieve event details by event ID
Update existing events (title, time, description, location)
Delete events
List events within a specified time range
Full integration with Google Calendar API
Secure OAuth2 authentication

Installation

Installing via Smithery

To install Google Calendar Integration for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @gongrzhe/server-calendar-mcp --client claude

Manual Installation

npm install @gongrzhe/server-calendar-mcp

Setup

Create a Google Cloud Project and obtain credentials:

a. Create a Google Cloud Project:
- Go to Google Cloud Console
- Create a new project or select an existing one
- Enable the Google Calendar API for your project
b. Create OAuth 2.0 Credentials:
- Go to "APIs & Services" > "Credentials"
- Click "Create Credentials" > "OAuth client ID"
- Choose "Desktop app" as application type
- Give it a name and click "Create"
- You will get your GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET
c. Get Refresh Token:
- Go to OAuth 2.0 Playground
- Click the gear icon (Settings) in the top right
- Check "Use your own OAuth credentials"
- Enter your OAuth Client ID and Client Secret
- In the left panel, find "Calendar API v3" and select "https://www.googleapis.com/auth/calendar"
- Click "Authorize APIs" and complete the OAuth flow
- Click "Exchange authorization code for tokens"
- Copy the "Refresh token" - this is your GOOGLE_REFRESH_TOKEN
Configure in Claude Desktop:

{
  "calendar": {
    "command": "npx",
    "args": [
      "@gongrzhe/server-calendar-mcp"
    ],
    "env": {
      "GOOGLE_CLIENT_ID": "your_client_id_here",
      "GOOGLE_CLIENT_SECRET": "your_client_secret_here",
      "GOOGLE_REFRESH_TOKEN": "your_refresh_token_here"
    }
  }
}

Usage Examples

The server provides several tools that can be used through the Claude Desktop:

Create Event

{
  "summary": "Team Meeting",
  "start": {
    "dateTime": "2024-01-20T10:00:00Z"
  },
  "end": {
    "dateTime": "2024-01-20T11:00:00Z"
  },
  "description": "Weekly team sync",
  "location": "Conference Room A"
}

List Events

{
  "timeMin": "2024-01-01T00:00:00Z",
  "timeMax": "2024-12-31T23:59:59Z",
  "maxResults": 10,
  "orderBy": "startTime"
}

Update Event

{
  "eventId": "event123",
  "summary": "Updated Meeting Title",
  "start": {
    "dateTime": "2024-01-20T11:00:00Z"
  },
  "end": {
    "dateTime": "2024-01-20T12:00:00Z"
  }
}

Delete Event

{
  "eventId": "event123"
}

Security Notes

Keep your Google API credentials secure
Regularly rotate your refresh tokens
Store sensitive information in Claude Desktop configuration
Never share or commit your credentials to version control
The refresh token gives access to your Google Calendar, treat it like a password

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the ISC License.

Author

gongrzhe

Support

If you encounter any issues or have questions, please file an issue on the GitHub repository.

Calendar MCP Server