0n3
MCP servers · Google Calendar · MCP server

Connect Codex CLI to Google Calendar

One line gives Codex CLI your Google Calendar account as tools: 5 endpoints, events, calendars, called with your own connection. No key in the prompt, a receipt for every call, revoke Codex CLI's access alone any time.

Get the line for Codex CLIConnect Google Calendar first

Three steps

  1. Create a free 0n3 account and connect Google Calendar. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into Codex CLI. OpenAI's terminal agent reads 0n3 over Streamable HTTP with a token from your environment.
  3. Ask Codex CLI: whoami. Then: "List events in Google Calendar".
Put the token in your environment
export ON3_TOKEN="<your 0n token>"

Add it to your shell profile so Codex finds it next time.

The line above carries a placeholder; 0n3.app/install mints a real key named for Codex CLI and fills it in.

What Codex CLI can then do in Google Calendar

Events · Manage calendar events4
List eventsGET /calendars/{calendarId}/events
Create an eventPOST /calendars/{calendarId}/events
Update an eventPUT /calendars/{calendarId}/events/{eventId}
Delete an eventDELETE /calendars/{calendarId}/events/{eventId}
Calendars · List calendars1
List calendarsGET /users/me/calendarList

Google Calendar in other AI clients

Claude Code + Google CalendarMCP server + skillClaude (desktop & claude.ai) + Google CalendarconnectorChatGPT + Google Calendarconnector · GPT actionGemini CLI + Google CalendarMCP serverCursor + Google CalendarMCP serverVS Code (Copilot) + Google CalendarMCP serverWindsurf + Google CalendarMCP server

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