Calendar AutoAuth MCP Server

A Model Context Protocol (MCP) server for Google Calendar integration in Cluade Desktop with auto authentication support. 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
• Simple OAuth2 authentication flow with auto browser launch
• Support for both Desktop and Web application credentials
• Global credential storage for convenience

Installation & Authentication

Installing via Smithery

To install Calendar AutoAuth Server for Claude Desktop automatically via Smithery:

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

1. Create a Google Cloud Project and obtain credentials:

a. Create a Google Cloud Project:

b. Create OAuth 2.0 Credentials:

2. Run Authentication:

You can authenticate in two ways:

a. Global Authentication (Recommended):

# First time: Place gcp-oauth.keys.json in your home directory's .calendar-mcp folder
   mkdir -p ~/.calendar-mcp
   mv gcp-oauth.keys.json ~/.calendar-mcp/

   # Run authentication from anywhere
   npx @gongrzhe/server-calendar-autoauth-mcp auth

b. Local Authentication:

# Place gcp-oauth.keys.json in your current directory
   # The file will be automatically copied to global config
   npx @gongrzhe/server-calendar-autoauth-mcp auth

The authentication process will:

> Note:

> - After successful authentication, credentials are stored globally in `~/.calendar-mcp/` and can be used from any directory

> - Both Desktop app and Web application credentials are supported

> - For Web application credentials, make sure to add `http://localhost:3000/oauth2callback` to your authorized redirect URIs

3. Configure in Claude Desktop:

{
  "mcpServers": {
    "calendar": {
      "command": "npx",
      "args": [
        "@gongrzhe/server-calendar-autoauth-mcp"
      ]
    }
  }
}

Docker Support

If you prefer using Docker:

1. Authentication:

docker run -i --rm \
  --mount type=bind,source=/path/to/gcp-oauth.keys.json,target=/gcp-oauth.keys.json \
  -v mcp-calendar:/calendar-server \
  -e CALENDAR_OAUTH_PATH=/gcp-oauth.keys.json \
  -e "CALENDAR_CREDENTIALS_PATH=/calendar-server/credentials.json" \
  -p 3000:3000 \
  mcp/calendar auth

2. Usage:

{
  "mcpServers": {
    "calendar": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-v",
        "mcp-calendar:/calendar-server",
        "-e",
        "CALENDAR_CREDENTIALS_PATH=/calendar-server/credentials.json",
        "mcp/calendar"
      ]
    }
  }
}

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

• OAuth credentials are stored securely in your local environment (`~/.calendar-mcp/`)
• The server uses offline access to maintain persistent authentication
• Never share or commit your credentials to version control
• Regularly review and revoke unused access in your Google Account settings
• Credentials are stored globally but are only accessible by the current user

Troubleshooting

1. OAuth Keys Not Found

2. Invalid Credentials Format

3. Port Already in Use

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.