MCP.Market

Google Calendar MCP server

by domdomegg·io.github.domdomegg/google-cal-mcp·v1.1.3·1 stars
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Allow AI systems to list, create, update, and manage Google Calendar events.

B83/100grade B
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Safety scan
B83/100

full report

Adoption
Growing

1 stars48 downloads/wk

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Google Calendar tools (15, 6 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • acl_list

    List who has access to a calendar and their permission levels.

  • calendarlist_deletewrite action

    Remove a calendar from the user's calendar list. This unsubscribes from the calendar but does not delete it.

  • calendarlist_insertwrite action

    Add an existing calendar to the user's calendar list. Use this to subscribe to shared calendars.

  • calendarlist_updatewrite action

    Update user-specific settings for a calendar (color, visibility, reminders, custom name).

  • calendars_list

    List all calendars the user has access to

  • colors_get

    Get the color definitions available for calendars and events. Returns color IDs that can be used with calendarlist_update.

  • event_createwrite action

    Create a new calendar event. Can include attendees and optionally create a Google Meet link.

  • event_deletewrite action

    Delete a calendar event

  • event_get

    Get details of a specific calendar event

  • event_instances

    Get all instances of a recurring event within a time range.

  • event_move

    Move an event to a different calendar. Changes the event organizer. Only works for default events (not birthday, focusTime, etc.).

  • event_respond

    RSVP to a calendar event invitation (accept, decline, or tentative)

  • event_updatewrite action

    Update an existing calendar event. Only specified fields will be changed.

  • events_list

    List calendar events within a time range. Returns events with their details including attendees and response status.

  • freebusy_query

    Find free and busy times for calendars within a time range. Useful for finding meeting availability.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan47 source files scanned; 47 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 18 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 83/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Google Calendar compares

Against every graded Productivity MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
83/100
higher than 60% of 1,301 Productivity servers
Tools
15
the typical Productivity server has 7
Tools that change things
40%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
1
more than 50% of 855 Productivity servers
Downloads a week
48
more than 36% of 433 Productivity servers with a package

What its tools let an agent do: 9 read · 6 change

Install Google Calendar in Claude Code, Cursor or VS Code

Runs npx -y google-cal-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add google-cal-mcp -- npx -y google-cal-mcp
Add to Cursor

What the publisher says

From the Google Calendar repository's README, as published. We do not edit it. Read it on GitHub

google-cal-mcp

MCP server for Google Calendar - list, create, update, and manage calendar events.

Use Cases

Schedule meetings: "Set up a 30-min sync with Sarah next week" → finds a free slot, creates the event with a Meet link, and sends the invite.

RSVP to invites: "Accept the team offsite but decline the vendor demo" → responds to pending invitations automatically.

Find availability: "When am I free this Thursday afternoon?" → queries your calendar and returns open slots.

Reschedule events: "Move my 1:1 with Alex to Friday at 2pm" → updates the event and notifies attendees.

Daily briefing: "What's on my calendar today?" → lists all events with times, locations, and attendees.

Block focus time: "Block 2 hours tomorrow morning for deep work" → creates a calendar event to protect your time.

(These are just examples - any workflow that needs calendar access can use this.)

Setup

1. Create Google OAuth credentials

  1. Go to Google Cloud Console
  2. Create a new project (or use existing)
  3. Enable the Google Calendar API
  4. Go to APIs & Services → OAuth consent screen, set up consent screen
  5. Go to APIs & Services → Credentials → Create Credentials → OAuth client ID
  6. Choose Web application
  7. Add http://localhost:3000/callback to Authorized redirect URIs
  8. Note your Client ID and Client Secret

2. Run the server

GOOGLE_CLIENT_ID='your-client-id' \
GOOGLE_CLIENT_SECRET='your-client-secret' \
MCP_TRANSPORT=http \
npm start

The server runs on http://localhost:3000 by default. Change with PORT=3001.

3. Add to your MCP client

With the server running, follow the instructions on install-mcp, which generates the right config for your MCP client (Claude Code, Claude Desktop, Cursor, Cline, VS Code, and more).

Architecture

This server acts as an OAuth proxy to Google:

graph LR
    A[MCP client] <--> B[google-cal-mcp] <--> C[Google OAuth/API]
  1. Server advertises itself as an OAuth authorization server via /.well-known/oauth-authorization-server
  2. /register returns the Google OAuth client credentials
  3. /authorize redirects to Google, encoding the client's callback URL in state
  4. /callback receives the code from Google and forwards to the client's callback
  5. /token proxies token requests to Google, injecting client credentials
  6. /mcp handles MCP requests, using the bearer token to call Calendar API

The server holds no tokens or state - it just proxies OAuth to Google.

Tools

Calendar API Scopes

  • calendar - Full access to calendars
  • calendar.events - Read/write events

Contributing

Pull requests are welcomed on GitHub! To get started:

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Google Calendar: common questions

Is Google Calendar MCP server safe?
Mostly: it is graded B (83/100). Read the Google Calendar safety report
How do I install Google Calendar?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Google Calendar need an API key?
Yes. The registry entry asks for GOOGLE_ACCESS_TOKEN, GOOGLE_CLIENT_SECRET.
Is Google Calendar maintained?
The last commit was 56 days ago (2026-09-09). The latest release is v1.1.3.
What can I use instead of Google Calendar?
Servers from other publishers that do the same job: Agent-Native Calendar MCP server, Caldav MCP server and Apple Calendar MCP server. Compare all Google Calendar alternatives.
How does Google Calendar compare with other Productivity MCP servers?
safety score 83/100 (higher than 60% of 1,301 Productivity servers); tools 15 (the typical Productivity server has 7); tools that change things 40% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to Google Calendar

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All Google Calendar alternatives →
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