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Google Calendar MCP Server

by peadams21
npmGitHub
JavaScript
MIT License
3
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Google Calendar MCP Server

A Model Context Protocol (MCP) server that provides comprehensive Google Calendar integration capabilities. This server allows AI assistants and applications to interact with Google Calendar through a standardized protocol.

Features

  • List Events: Retrieve events from Google Calendar with filtering options
  • Create Events: Create new calendar events with full customization
  • Update Events: Modify existing calendar events
  • Delete Events: Remove events from calendars
  • List Calendars: Get available calendars for the authenticated user
  • OAuth Authentication: Secure Google Calendar API access

Tools Available

list_events

Retrieve events from a Google Calendar with various filtering options.

Parameters:

  • calendarId (optional): Calendar ID (default: "primary")
  • timeMin (optional): Lower bound for event start time (RFC3339 timestamp)
  • timeMax (optional): Upper bound for event start time (RFC3339 timestamp)
  • maxResults (optional): Maximum number of events (default: 250)
  • singleEvents (optional): Expand recurring events (default: true)
  • orderBy (optional): Order events by "startTime" or "updated"

create_event

Create a new event in Google Calendar.

Parameters:

  • calendarId (optional): Calendar ID (default: "primary")
  • summary (required): Event title
  • description (optional): Event description
  • start (required): Start date/time object with dateTime and optional timeZone
  • end (required): End date/time object with dateTime and optional timeZone
  • location (optional): Event location
  • attendees (optional): Array of attendee objects with email and displayName
  • recurrence (optional): Array of RRULE strings for recurring events

update_event

Update an existing calendar event.

Parameters:

  • calendarId (optional): Calendar ID (default: "primary")
  • eventId (required): ID of the event to update
  • summary (optional): New event title
  • description (optional): New event description
  • start (optional): New start date/time
  • end (optional): New end date/time
  • location (optional): New event location
  • attendees (optional): New attendees list

delete_event

Delete an event from Google Calendar.

Parameters:

  • calendarId (optional): Calendar ID (default: "primary")
  • eventId (required): ID of the event to delete

list_calendars

List available Google Calendars for the authenticated user.

Parameters:

  • minAccessRole (optional): Minimum access role filter
  • showDeleted (optional): Include deleted calendars (default: false)
  • showHidden (optional): Include hidden calendars (default: false)

Setup

Prerequisites

  1. Google Cloud Project: Create a project in Google Cloud Console
  2. Enable Google Calendar API: Enable the Calendar API for your project
  3. Service Account: Create a service account and download the JSON key file

Installation

  1. Clone this repository
  2. Install dependencies:
    npm install
  3. Copy the environment file and configure:
    copy .env.example .env
  4. Edit .env and set your Google Service Account key file path:
    GOOGLE_SERVICE_ACCOUNT_KEY_FILE=./path/to/your/service-account-key.json

Building

# Build the TypeScript code npm run build # Development mode with hot reload npm run dev # Type checking npm run type-check # Clean build artifacts npm run clean

Usage

Running the Server

# Start the compiled server npm start # Or run in development mode npm run dev

Integrating with MCP Clients

Add this server to your MCP client configuration:

{ "servers": { "google-calendar": { "type": "stdio", "command": "node", "args": ["./dist/index.js"] } } }

For VS Code with MCP extension, add to .vscode/mcp.json:

{ "servers": { "google-calendar-mcp-server": { "type": "stdio", "command": "node", "args": ["./dist/index.js"] } } }

Authentication Setup

  1. Create a Service Account:
    • Go to Google Cloud Console
    • Navigate to IAM & Admin > Service Accounts
    • Create a new service account
    • Download the JSON key file
  2. Share Calendar Access:
    • Open Google Calendar
    • Go to calendar settings
    • Share your calendar with the service account email
    • Grant "Make changes to events" permission
  3. Configure Environment:
    • Place the JSON key file in your project directory
    • Update the .env file with the correct path

Development

Project Structure

src/ ├── index.ts # Main MCP server implementation ├── types/ # TypeScript type definitions └── utils/ # Utility functions .env.example # Environment variable template tsconfig.json # TypeScript configuration package.json # Node.js dependencies and scripts

Adding New Tools

  1. Define a Zod schema for input validation
  2. Create a ToolSchema definition
  3. Implement the async handler function
  4. Register the tool in the server
  5. Add comprehensive error handling

Error Handling

All tools return structured responses:

// Success response { content: [{ type: "text", text: JSON.stringify(result) }] } // Error response { content: [{ type: "text", text: JSON.stringify(error) }], isError: true }

Security Considerations

  • Never commit service account keys to version control
  • Use environment variables for all sensitive configuration
  • Implement proper error handling to avoid information leakage
  • Regularly rotate service account keys
  • Follow Google Cloud security best practices

Contributing

  1. Fork the repository
  2. Create a feature branch
  3. Make your changes with proper tests
  4. Submit a pull request

License

MIT License - see LICENSE file for details

Support

For issues and questions:

Deploy Server
A
security – no known vulnerabilities
A
license - permissive license
A
quality - confirmed to work

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Tools

Provides comprehensive Google Calendar integration capabilities allowing AI assistants to list, create, update, and delete calendar events through a standardized Model Context Protocol.

  1. Features
    1. Tools Available
      1. list_events
      2. create_event
      3. update_event
      4. delete_event
      5. list_calendars
    2. Setup
      1. Prerequisites
      2. Installation
      3. Building
    3. Usage
      1. Running the Server
      2. Integrating with MCP Clients
      3. Authentication Setup
    4. Development
      1. Project Structure
      2. Adding New Tools
      3. Error Handling
    5. Security Considerations
      1. Contributing
        1. License
          1. Support

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