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Connect Flax to Codex

Connect Codex directly to your Flax website with a few copy-and-paste commands.

Open Codex

Overview

  • Your plan: OpenAI currently offers Codex with Go and, for a limited time, Free. Usage limits vary.
  • What you will do: add Flax in the Codex command line, sign in, and choose your website.
  • No directory wait: connect directly to Flax using its secure sign-in.

This guide uses the Codex command line in Terminal on Mac or PowerShell on Windows. It is a copy-and-paste setup. If you prefer a browser-only setup, see Connect Flax to ChatGPT.

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Codex can connect directly to your Flax website without waiting for a public Plugins Directory listing.

OpenAI currently offers Codex with Go and, for a limited time, Free. Other paid plans also include Codex. Usage limits vary by plan.

This setup uses Codex from the command line. If Codex is not installed, follow OpenAI’s Codex setup guide first. Then open Terminal on Mac or PowerShell on Windows.

Copy the first command from this guide and press Enter. It adds Flax to Codex. Copy the second command and press Enter. Codex opens a browser so you can sign in to Flax.

Choose the website you want to connect, approve access, then return to the command line. Use the last command to check that Flax appears in the connection list.

Start a new Codex task and ask for a website review. For example: “Please review my website and suggest three improvements. Don’t make or publish any changes yet.”

Before you start

  • Install Codex CLI and sign in with your ChatGPT account. Follow OpenAI’s Codex CLI setup guide.
  • OpenAI currently offers Codex with Go and, for a limited time, Free. Other paid plans also include it. Usage limits vary. See OpenAI’s current Codex plan details.
  • Have your Flax sign-in ready. You will enter it on the Flax page that opens in your browser, not in the command line.

1. Add Flax to Codex

Open Terminal on Mac or PowerShell on Windows. Copy this line, paste it into the window, and press Enter:

codex mcp add flax --url https://agents.flaxsites.com/mcp

This saves the Flax connection in Codex on this computer. It does not change your website.

Screenshot: Terminal showing the command to add Flax to Codex

2. Sign in to Flax

Copy this line into Terminal or PowerShell and press Enter:

codex mcp login flax
  1. When the browser opens, sign in to your Flax account.
  2. Choose the website you want Codex to access.
  3. Approve the connection, then return to the command line.
Screenshot: Flax sign-in page opened from Codex

3. Check the connection

Run this command. If you see flax in the list, it is ready:

codex mcp list
Screenshot: Terminal showing Flax in the Codex connection list

4. Ask Codex to help with your site

  1. Open Codex and start a new task.
  2. Try this prompt:
    Please review my website and suggest three simple improvements. Don’t make or publish any changes yet.
  3. When you are ready for an update, tell Codex what you want changed. Review the result in Flax before publishing.

Which plan do I need?

OpenAI currently offers Codex with Free for a limited time and includes it with Go and other paid plans. Plan limits and availability can change. This Flax connection is made directly from Codex, so it does not use ChatGPT Developer Mode or require a Flax public-directory listing.

If Codex cannot find the Flax connection, close and reopen Codex after setup, then start a new task. For help, see the Flax agent guide.