Google Calendar MCP Server

Google Calendar MCP Server

An MCP server exposing Google Calendar tools to any MCP-compatible client (e.g., Claude Desktop, Cursor MCP CLI). It lets you:

• List events in a time window

• Create events

• Delete events by summary

Prerequisites

• Python 3.11+

• A Google Cloud project with OAuth 2.0 Client ID (Desktop) for Google Calendar API

• credentials.json downloaded locally (do not commit it)

Setup

1. Clone and install dependencies

uv sync  # or: pip install -e .

2. Enable Google Calendar API and download OAuth credentials

• Go to Google Cloud Console → APIs & Services → Credentials

• Create OAuth client ID: Application type "Desktop app"

• Download the JSON and save it as credentials.json at the project root

3. First run / OAuth consent

The first call to any tool will open a browser for consent and produce token.json locally (ignored by git).

Running the MCP server

python -m src.service  # Not the server entry
python main.py         # Starts the MCP over stdio

Use from MCP-compatible clients by pointing to main.py as the command.

Tools

• get_google_calendar_events(maxResults, calendarId="primary", singleEvents=True, orderBy="startTime", timeMin=None, timeMax=None)

  • Returns a list like: [{ "title": str, "start-time": str, "end-time": str }]

• create_google_calendar_event(summary, start: datetime, end: datetime, description=None, location=None, time_zone="Asia/Dhaka")

  • Returns the created event HTML link (if available)

• delete_google_calendar_event(event_name: str)

  • Deletes the first exact summary match

MCP client configuration (example)

Example JSON snippet for a client config:

{
  "mcpServers": {
    "google-calendar": {
      "command": "python",
      "args": ["main.py"],
      "env": {}
    }
  }
}

Notes

• Keep credentials.json and token.json out of git.

• Time strings must be RFC3339 with timezone (e.g., 2025-08-08T00:00:00+06:00).

• All-day events return a date string instead of dateTime.