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Connect Codex to Google Calendar

Connect Codex to Google Calendar: 1. Sign in to ApexGenius and connect Google Calendar. 2. Add the ApexGenius plugin. 3. Start using Google Calendar in Codex. Start in Plugins in the ChatGPT desktop app and authorize your connection.

Connect Google CalendarSee the setup

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How to connect Google Calendar to Codex

  1. 1Sign in to ApexGenius and connect Google Calendar
  2. 2Add the ApexGenius plugin to Codex
  3. 3Start using Google Calendar in Codex

FirstConnect Google Calendar to ApexGenius

ThenConnect ApexGenius to Codex

Google Calendarapexgenius.ai/connections/google_calendar1 of 3

Connect Google Calendar. Google Calendar shows as connected in ApexGenius.

Then ask Codex:

List the calendars available to me. Do not create or change events.

Written setup, step by stepShow

Before you start

  • An account with permission to use the Google Calendar resources you intend to connect.

1. Connect Google Calendar to ApexGenius

  1. Open Google Calendar in Connections. Choose Connect, or Add connection when offered. Give the connection a name if prompted. If Gateway setup pending appears, contact ApexGenius support before continuing.
  2. Choose the account and review access. Sign in to the Google account that has access to the intended resources. Review the permissions Google requests, then return to ApexGenius.
  3. Review the connected account and resources. Find Allowed resources on the connection page or its Tools tab. Choose Refresh and enable only the connected Calendar account. Resource selection does not add permissions to the Google account.
  4. Check the connection. Use Test connection or Check again and read the reported status. Add an AI agent from the AI agents page, choose Read only for the first test, and try the question below.
    The actual Google Calendar connection page in ApexGenius, showing its saved connection status.
    This captured Google Calendar connection reports ready. Check your own connection and its latest validation before using tools.Open full-size image (opens in a new tab)
Connect Google Calendar →

2. Connect ApexGenius to Codex

  1. In the desktop app, open Settings, then MCP servers and Add server.
  2. Name the server ApexGenius, choose Streamable HTTP, and paste the MCP address above.
  3. Save, then select Restart. Choose Authenticate for ApexGenius and complete the browser sign-in.
  4. When ApexGenius asks what this AI client may use, choose Read only for the first test, or Custom to limit it to the tools you need.
  5. Start a new conversation and select ApexGenius from the available tools before asking for live data.
Official Codex setup instructions ↗

Watch the setup

Follow each step at your own pace.

Codex desktop app with Plugins selected and ApexGenius listed under Available to your account.
Open Codex in the ChatGPT desktop app, then Plugins, and find ApexGenius.Open full-size image (opens in a new tab)

Step 1 of 4Open Plugins

The walkthrough uses the original ChatGPT web plugin captures. After connecting, open Codex in the desktop app and start a new task with ApexGenius. A ChatGPT web connection does not verify Codex access.

A public ApexGenius plugin listing is not verified. Use a plugin shared with you or one you created, subject to your account and workspace policy.

OpenAI Plugins guide (opens in a new tab)Full Codex setup guide
Create a personal plugin

Where Developer mode is available, open ChatGPT Settings, then Security and login, and enable it. In Plugins, select the plus button, enter ApexGenius and a description, then add this URL under Connection. Create the connection, complete OAuth, and review the tools. Return to Codex in the desktop app and start a new task with the plugin enabled.

https://server.autom8.pro/mcp
OpenAI custom connection guide (opens in a new tab)
No plugin available? Use desktop settings
  1. In the ChatGPT desktop app, open Settings, then MCP servers, then Add server.
  2. Name the server ApexGenius, choose Streamable HTTP, and paste the MCP address below.
  3. Save, select Restart, then Authenticate. Sign in to ApexGenius and authorize the intended connections and access.
  4. Start a new Codex task and ask one read-only question. Check the returned result and its matching successful read in Activity.
https://server.autom8.pro/mcp
OpenAI desktop MCP settings (opens in a new tab)
Manual setup for developers

Codex CLI is optional. Run these commands, complete browser authorization, then start a new session. Do not paste bearer tokens or static authorization headers.

Register the remote MCP server

codex mcp add apexgenius --url https://server.autom8.pro/mcp

Authorize in your browser

codex mcp login apexgenius

Inspect registered servers

codex mcp list

The desktop app, CLI, and IDE extension share MCP configuration on the same host. The IDE extension does not install plugins. ChatGPT web does not read local Codex configuration.

3. Verify one safe read

List the calendars available to me. Do not create or change events.

List the calendars available to me. Do not create or change events.

Compare the returned account and resource with Google Calendar. Check the connection status separately from the result of the first read.

What Codex can do in Google Calendar

9 operations. Read looks things up and changes nothing. Write changes Google Calendar and runs only when that tool is enabled.

Read5 operations

Looks things up. Changes nothing.

Calendars and events

  • list_calendarsList the calendars you own or subscribe to.
  • list_eventsList the events on a calendar, for a time range or matching words.
  • search_eventsSearch your main calendar by topic.
  • get_eventRead one event.

Find a time

  • suggest_timeSuggest open times that work for everyone you name.

Write4 operations

Changes Google Calendar. Runs only when enabled.

Create and change

  • create_eventCreate an event, with guests, a Meet link and reminders if you want.
  • update_eventChange an event’s time, title, guests or details.
  • respond_to_eventAccept, decline or answer maybe to an invite.
  • delete_eventDelete an event. Guests are told by default.

You choose what Codex can use

When you approve Codex, pick Full access, Read only, or Custom. Read only allows the Read operations and nothing else. Custom picks apps and tools one by one.

Limits in Google Calendar

  • · The connected Google account decides which calendars can be read and changed.
  • · When your AI adds, changes or cancels an event with guests, Google emails them unless the call says not to.
  • · Enabled writes run immediately. Turn a tool off to block calls.
  • · Disconnecting stops future access. It does not undo an event change or recall an email.

What it looks like in Codex

An illustrative read-only request and response. Your results come from the account and dates you choose.

How the route works
Codex
CodexApexGenius MCP route
List the calendars available to me. Do not create or change events.
ApexGenius
Working with ApexGenius1 tool search · 1 read
RequestCheck the calendars
Account scopeAuthorized connections checked
apex_search_toolsGoogle Calendar calendars · Find Google Calendar toolsComplete
apex_call_write_toollist_calendars · List calendarsComplete
Codex

Illustrative example: three calendars, your own, a team calendar and a holidays calendar you subscribe to. Nothing was changed.

Read-only route
Codex

Try asking

“List the calendars available to me. Do not create or change events.”

“What is on my calendar tomorrow?”

“Find a free hour for me and the two people I name next week.”

“Book a 30 minute call with the client I name on Thursday afternoon. Show me the event first.”

More connections like this one

One ApexGenius account covers every pair below. Connect an app once and each agent you allow can use it.

Codex with other apps

Questions people ask first

How do I connect Google Calendar?

Open Google Calendar in ApexGenius Connections, choose Connect, and sign in with the Google account for the calendar you want.

Which calendars can my AI see?

The calendars the connected Google account owns or subscribes to, and other calendars shared with it when your AI names them.

Will my AI email my guests?

Google emails guests when an event with guests is created, changed or cancelled, unless your AI is asked to turn that off. Say so in your request when you do not want it.

Can my AI cancel events?

Yes. Deleting an event is marked destructive. Enabled writes run immediately. Turn a tool off to block calls.

Will this list of tools change?

Google publishes the Calendar MCP tools, and ApexGenius reads Google’s live list on every search. This page shows the list as of its review date.

Connect Google Calendar to Codex today

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