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.

• 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

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:

   • 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 either "Desktop app" or "Web application" as application type
   • Give it a name and click "Create"
   • For Web application, add http://localhost:3000/oauth2callback to the authorized redirect URIs
   • Download the JSON file of your client's OAuth keys
   • Rename the key file to gcp-oauth.keys.json

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:

   • Look for gcp-oauth.keys.json in the current directory or ~/.calendar-mcp/
   • If found in current directory, copy it to ~/.calendar-mcp/
   • Open your default browser for Google authentication
   • Save credentials as ~/.calendar-mcp/credentials.json

   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"
      ]
    }
  }
}

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"
      ]
    }
  }
}

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

{
  "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"
}

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

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

{
  "eventId": "event123"
}

• 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

1. OAuth Keys Not Found

   • Make sure gcp-oauth.keys.json is in either your current directory or ~/.calendar-mcp/
   • Check file permissions

2. Invalid Credentials Format

   • Ensure your OAuth keys file contains either web or installed credentials
   • For web applications, verify the redirect URI is correctly configured

3. Port Already in Use

   • If port 3000 is already in use, please free it up before running authentication
   • You can find and stop the process using that port

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

This project is licensed under the ISC License.

gongrzhe

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