Google Calendar MCP Server

This MCP server provides integration with Google Calendar, allowing Claude to view, create, and manage calendar events through a standardized interface.

Features

• List available calendars
• List events from a calendar
• Create new calendar events
• Update existing events
• Delete events

Prerequisites

• Node.js 16 or higher
• A Google Cloud project with the Calendar API enabled
• OAuth 2.0 credentials (Client ID and Client Secret)

Google Cloud Setup

1. Go to the Google Cloud Console
2. Create a new project or select an existing one
3. Enable the Google Calendar API
4. Create OAuth 2.0 credentials:
   • Go to Credentials
   • Click "Create Credentials" > "OAuth client ID"
   • Choose "Desktop app" as the application type
   • Give it a name (e.g., "Google Calendar MCP")
   • Download the credentials JSON file
   • Rename the downloaded file to gcp-oauth.keys.json and place it in the root directory of this project

Installation

1. Install dependencies:

   npm install
   

2. Build the TypeScript code:

   npm run build
   

3. Update the Claude MCP settings file to include this server:

   • Add the following to cline_mcp_settings.json:

   "github.com/pashpashpash/google-calendar-mcp": {
     "command": "node",
     "args": ["C:/Users/ralph/Documents/Cline/MCP/google-calendar-mcp/build/index.js"],
     "env": {},
     "disabled": false,
     "autoApprove": []
   }
   

Authentication Process

The first time you use the Google Calendar MCP server, it will:

1. Detect that you don't have authentication tokens
2. Start an authentication server (on ports 3000-3004)
3. Open a browser window for OAuth authentication
4. Save the authentication tokens securely
5. Shut down the authentication server and continue normal operation

Your authentication tokens will be stored in .gcp-saved-tokens.json and will refresh automatically.

Available Tools

Tool	Description
list-calendars	List all available calendars
list-events	List events from a specific calendar
create-event	Create a new calendar event
update-event	Update an existing calendar event
delete-event	Delete a calendar event

Examples

Listing Calendars

list-calendars

Listing Events

list-events
calendarId: "primary"
timeMin: "2023-01-01T00:00:00Z"
timeMax: "2023-12-31T23:59:59Z"
maxResults: 10

Creating an Event

create-event
calendarId: "primary"
summary: "Team Meeting"
location: "Conference Room B"
description: "Weekly team sync meeting"
startDateTime: "2023-06-15T10:00:00"
endDateTime: "2023-06-15T11:00:00"
timeZone: "America/New_York"
attendees: ["colleague1@example.com", "colleague2@example.com"]

Updating an Event

update-event
calendarId: "primary"
eventId: "event_id_from_list_events"
summary: "Updated Meeting Title"
startDateTime: "2023-06-15T11:00:00"
endDateTime: "2023-06-15T12:00:00"

Deleting an Event

delete-event
calendarId: "primary"
eventId: "event_id_from_list_events"

Troubleshooting

• OAuth token expires after 7 days: You must re-authenticate if the app is in testing mode.
• Authentication errors: Ensure gcp-oauth.keys.json is correctly formatted and placed in the project root.
• Port conflicts: The authentication server tries ports 3000-3004; ensure at least one is available.