Google Calendar MCP Server

Interact with your Google Calendar through Claude Desktop using the Model Context Protocol (MCP).

This is a TypeScript-based MCP server that implements Google Calendar integration. It demonstrates core MCP concepts while providing:

• Calendar event management through MCP URIs
• Tools for creating and modifying events
• Prompts for generating calendar insights

Features

Resources

• Access calendar events via MCP URIs
• Each event has title, time, description, and attendees
• Structured event data with proper mime types

Tools

• create_event - Create new calendar events
  • Takes title, time, and other event details as parameters
  • Directly interfaces with Google Calendar API
• list_events - View upcoming calendar events
• [Add other tools you’ve implemented]

Prompts

• analyze_schedule - Generate insights about your calendar
  • Includes upcoming events as embedded resources
  • Returns structured prompt for LLM analysis
• [Add other prompts you’ve implemented]

Prerequisites

• Node.js (v14 or higher)
• A Google Cloud Project with Calendar API enabled
• OAuth 2.0 Client credentials

Development

Install devbox by following instructions at devbox.sh

curl -fsSL https://get.jetpack.io/devbox | bash

Initialize devbox in the project directory:

devbox init

Start the devbox shell:

devbox shell

Install dependencies:

npm install

Build the server:

npm run build

For development with auto-rebuild:

npm run watch

Installation

To use with Claude Desktop, add the server config:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "Google Calendar": {
      "command": "/path/to/Google Calendar/build/index.js"
    }
  }
}

First-Time Setup

1. Set up Google Cloud credentials:

   • Go to Google Cloud Console
   • Create a new project or select an existing one
   • Enable the Google Calendar API
   • Create OAuth 2.0 credentials (Desktop application type)
   • Download the client secret JSON file
   • Rename it to .client_secret.json and place it in the project root

2. Initial Authentication:

   • When first running the server, it will provide an authentication URL
   • Visit the URL in your browser
   • Grant the requested permissions
   • Copy the provided authorization code
   • Paste the code back into the CLI prompt

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in your browser.