Bring Cocal into the chat you already use.

The same hosted server URL works with Claude, ChatGPT, Gemini, and Claude Code. Add it to your client, then sign in to Cocal and approve the connection.

Server URL

https://mcp.cocal.io/mcp

ChatGPT

Add Cocal from Plugins as a custom server.

  1. Open ChatGPT’s Plugins page. Choose the plus button, then Add custom MCP server.
  2. Name it Cocal, add a short description, and enter https://mcp.cocal.io/mcp as the server URL under Connection.
  3. Choose OAuth authentication, review the permissions, and choose Create as a plugin. Finish signing in to Cocal when prompted.
  4. Review the tools and install the plugin. In a new chat, type @ and select Cocal.

Try first

Use Cocal to show me where I have time this week.

Availability and write actions depend on your ChatGPT plan, workspace role, and admin settings.

Gemini

Add Cocal as a custom Connected App in Gemini.

  1. On the Gemini website, open Settings, then Connected Apps. If needed, open Personal Intelligence first.
  2. Under Custom apps, choose to add a custom app.
  3. Paste https://mcp.cocal.io/mcp, choose Next, then sign in to Cocal and approve the connection.
  4. In Gemini, type @ and choose Cocal when you want it to work with your calendars.

Try first

Use Cocal to check my calendars for conflicts tomorrow.

Gemini custom apps currently require a personal Google account, age 18 or over, US access, English, and Keep Activity turned on.

Claude Code

Add Cocal from your terminal.

  1. Run claude mcp add --transport http cocal https://mcp.cocal.io/mcp.
  2. Restart Claude Code so it loads the new server.
  3. On first use, finish the browser authorization flow with Cocal.

Try first

Use Cocal to list my next five calendar events.

Claude Code may ask you to reconnect after local or server restarts.

Need to connect your calendars first?

Cocal works after your Cocal account has at least one calendar account connected.

Open calendar setupSee how it works