Plugin Eval

Get it working

Install → restart → verify. Stay on this page until Plugin Eval responds.

1. 01

   Copy the install command

   Use the command on this page — it includes the correct --plugin flag for this plugin.

2. 02

   Run it in your project terminal

   Execute the command from the directory where you use Codex, not necessarily your home folder.

3. 03

   Restart or reload Codex

   Restart the Codex CLI or reload your IDE window so the new extension is picked up.

4. 04

   Verify with a prompt

   Try one of the verify prompts below to confirm Plugin Eval is active.

If install fails

Fix these common issues before digging into GitHub issues.

• Command not found or install fails

  Use Node.js 18+ and confirm npx works. Corporate proxies may need HTTPS_PROXY set for GitHub and npm.

• Installed but Codex ignores it

  Restart the Codex CLI or reload the IDE window. Confirm you used the correct --plugin / --skill / --hook flag.

• OAuth or sign-in loops

  Clear browser cookies for the provider and retry authorization. Sign in to Codex with the same ChatGPT account you use daily.

About

Key features

• Official extension maintained for current Codex APIs
• Adds Plugin Eval capabilities directly inside Codex chat
• Installs with one npx command — no manual config editing
• Built for ai & agents workflows

Requirements

• Node.js 18 or newer with npx available
• Codex CLI or IDE extension installed and signed in
• Some official plugins open OAuth in your browser on first use