Steps
- 01
Confirm Node.js 18+ and Codex are installed and signed in.
- 02
Install the three starter items below in order.
- 03
Restart Codex after each install (or once at the end).
- 04
Run each verify prompt to confirm the extension is live.
Use case
First-time Codex setup
You are new to Codex extensions and do not know whether to start with a plugin, skill, or hook.
Outcome: Install one of each: GitHub (plugin), Frontend Design (skill), and Simple Notifications (hook). Verify each with a prompt.
Install these
Copy a command, run it, restart Codex, then use the verify prompt.
Connect Codex to PRs, issues, and CI — the most common first install.
$ npx codex-marketplace add openai/plugins/plugins/github --pluginVerify
“List my open pull requests and summarize what each one changes”
Give the agent a production-grade UI playbook for frontend work.
$ npx codex-marketplace add am-will/codex-skills/skills/frontend-design --skillVerify
“Redesign this page with clearer hierarchy and better spacing”
Get a desktop ping when Codex finishes — no Slack webhook needed.
$ npx codex-marketplace add am-will/codex-skills/hooks/aitmpl-codex/automation/simple-notifications --hookVerify
“Ask Codex to finish a short task and watch for the notification”
FAQ
Plugin vs skill vs hook?
Plugins add integrations (often OAuth). Skills are instruction packs for specialized tasks. Hooks automate lifecycle events in the background.
Is this an official OpenAI marketplace?
No. This is a directory of install commands for Codex plugins, skills, and hooks. Always review the GitHub source before production use.