TL;DR:
Google Calendar MCP lets your AI assistant read, analyze, and write to your calendar using the Model Context Protocol, replacing manual copy-paste workflows with direct tool access.
Self-hosting an MCP server is free but requires you to handle OAuth token expirations yourself, debug broken connections, and maintain local server uptime on an ongoing basis.
Composio's managed gateway gets you set up quickly and handles all token refreshes automatically, so the connection stays active without maintenance from you.
The free tier is generous: 20,000 tool calls per month with no credit card required.
Google Calendar becomes much more useful when your AI assistant can act on it. Instead of copying dates between tabs, checking availability manually, or opening Calendar every time a meeting changes, you can handle the work through a prompt.
The catch is that most MCP setup guides make the connection feel harder than it needs to be. Self-hosting means configuring OAuth, storing credentials, refreshing tokens, and keeping the server running. This guide skips that overhead and shows you how to connect Google Calendar through Composio’s managed MCP gateway, so you can get ChatGPT, Claude, or Cursor working with your calendar without turning the setup into a side project.
How to connect Google Calendar to ChatGPT Work
Prerequisites
A ChatGPT account with access to ChatGPT Work
The ChatGPT desktop app
Access to the Google Calendar you want to connect
Access to the Composio MCP server
Permission to approve OAuth access for the selected Google account
1. Open the MCP settings
Open ChatGPT Work → Go to Settings → Open Plugins → Select the MCP tab.
2. Add the Composio server
Click Add server → Enter Composio in the Name field → Select Streamable HTTP as the Type → Paste https://connect.composio.dev/mcp into the URL field → Click Save.
3. Authenticate your Composio account
Find the Composio server in your MCP plugins list → Click Authenticate → Sign in through Composio → Review the requested permissions → Click Allow access.
4. Connect and use Google Calendar
Open a new conversation in ChatGPT Work → Ask ChatGPT to perform an action in Google Calendar → Sign in to Google Calendar and approve access when prompted → Start creating, viewing, updating, or deleting calendar events using natural-language instructions.
How to connect Google Calendar to Claude Cowork
Prerequisites
A Claude subscription with access to Claude Cowork
Claude Desktop installed
Access to the Google Calendar you want to connect
Access to the Composio MCP server
Permission to approve OAuth access for the selected Google account
1. Open the connectors settings
Open Claude Desktop → Click Customize in the left sidebar → Select Connectors → Click the + icon.
2. Add the Composio MCP server
Click Add custom connector → Paste https://connect.composio.dev/mcp into the connector URL field
3. Authorize Composio
Your browser opens automatically → Sign in to your Composio account if required → Review the requested permissions → Click Allow to authorize the connection.
4. Connect your Google Calendar
Return to Claude Cowork → Ask Claude to perform a Google Calendar task such as creating or listing events → Sign in to your Google account if prompted → Approve the requested Google Calendar permissions → Start using Google Calendar through natural language.
How to connect Google Calendar to Cursor
Prerequisites
Cursor installed on your device
A Cursor project or access to Cursor’s global configuration
Access to the Google Calendar you want to connect
Access to the Composio MCP server
Permission to approve OAuth access for the selected Google account
1. Install Composio in Cursor
Open the Composio Google Calendar integration page → Click Install in Cursor → Approve the request to open Cursor → Add the Composio MCP server.
2. Add the Composio MCP server manually
If you're comfortable editing config files directly, add the following to .cursor/mcp.json in your project root, or ~/.cursor/mcp.json for a global configuration → Save the file.
{
"servers": {
"composio": {
"type": "http",
"url": "https://connect.composio.dev/mcp"
}
}
}3. Authorize Composio
Restart Cursor → Open the MCP Tools settings → Find Composio → Click Connect → Complete the authorization process in the browser window that opens.
4. Connect your Google Calendar
Return to Cursor → Ask the agent to connect to Google Calendar or give it a Google Calendar task → Sign in to your Google account when prompted → Approve the requested Google Calendar permissions.
5. Use Google Calendar in Cursor
Ask Cursor to create a meeting, list upcoming events, find available time slots, update an event, or delete a canceled event → Review and approve any requested action.
Google Calendar MCP use cases
Turn a conversation into a real meeting
One of the most useful things you can do with Google Calendar MCP is create a meeting while you are already discussing it. You might be planning a launch in Claude, reviewing a project in ChatGPT, or working through tasks in Cursor. Instead of stopping to open Google Calendar, copy over the details, add attendees, and set reminders, you can ask the assistant to handle it there and then.
This works especially well when the conversation already contains the meeting context. The assistant can pull out the title, attendees, duration, agenda, and timing, then create the event with those details included. You still get the final say, but you avoid the usual admin work that happens between agreeing to a meeting and actually putting it on the calendar.
Example prompt:
Create a 45-minute meeting next Tuesday at 2 PM called “Q3 Marketing Review.” Invite Sarah and James, add a Google Meet link, include the agenda we just discussed in the description, and set a reminder for 15 minutes before.
Find a time that works
Finding a free slot can become tedious when your week is already packed. Google Calendar MCP can review your existing events, avoid conflicts, and suggest times that match the constraints you give it. You can be as specific as needed, such as asking for a morning slot, avoiding back-to-back meetings, or leaving time for lunch.
This is useful for longer sessions where squeezing something into the first available gap is not good enough. You can ask the assistant to find several options, compare them, and then book the one that works best. It saves you from scanning your calendar day by day and makes scheduling feel much less mechanical.
Example prompt:
Find three 90-minute slots next week for a product planning session. Keep them between 10 AM and 4 PM, avoid back-to-back meetings, and do not schedule anything over lunch.
Clean up a messy calendar
Calendar plans change constantly. Meetings move, attendees drop out, titles become outdated, and duplicate events pile up. With Google Calendar MCP, you can manage those changes in plain language instead of opening each event and editing it manually.
You can ask the assistant to move a meeting, update the description, add or remove guests, cancel an event, or show everything coming up on a certain day. This is particularly helpful when several changes need to happen at once. Rather than making each edit separately, you can describe the full update in one request.
Example prompt:
Move tomorrow’s meeting with Alex from 3 PM to 4 PM, change the title to “Final Roadmap Review,” add the latest project notes to the description, and notify everyone about the new time.
Connect Google Calendar to your AI assistant today
Whether you're scheduling meetings, finding free time, or keeping your calendar up to date, Google Calendar MCP lets your AI assistant do the work for you. Instead of jumping between conversations and your calendar, you can manage everything from one place using natural language.
Connect your Google account through Composio's MCP server and start managing your schedule directly from ChatGPT, Claude, Cursor, or your preferred MCP-compatible assistant.
FAQs
How much does it cost to connect Google Calendar via Composio?
Composio's free tier is generous: 20,000 tool calls per month with no credit card required. If you exceed this limit, the entry paid plan is $29 per month for 50,000 tool calls.
Is my private calendar data safe with Composio?
Yes. Composio is SOC 2 and ISO 27001 certified and applies zero-day log retention by default. Your credentials are encrypted in transit and at rest, and Composio's managed auth layer sits between your AI client and Google, handling authentication so your credentials are never exposed directly.
Does Composio support ChatGPT in addition to Claude Desktop?
Yes. The same Composio MCP URL works with ChatGPT's MCP support and with frameworks including LangChain, CrewAI, LlamaIndex, and Mastra.
Key terms glossary
Model Context Protocol (MCP): A connector developed by Anthropic that lets AI models securely read data and take actions in other apps.
Managed gateway: A cloud-hosted service like Composio that handles the hosting, security, and authentication of MCP servers so you don't have to run them locally on your machine.
OAuth 2.0: The industry-standard protocol Google uses to grant third-party applications limited access to your account without sharing your password. Tokens issued via OAuth expire on short intervals unless a managed refresh layer handles the lifecycle automatically.
Tool Router: A Composio feature that automatically directs your AI's requests to the correct connected application, eliminating the need to write custom conditional logic in your configuration.
Scope: The specific set of permissions an OAuth flow grants a third-party app. For Google Calendar, scopes control whether the app can read events, create events, or both.