How do I install the Install Codex Plugin skill?

Run npx skillmds@latest add understudylabs/install-codex-plugin in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Install Codex Plugin safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Install Codex Plugin?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Install Codex Plugin free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Install Codex Plugin?

understudylabs (@understudylabs) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Install Codex Plugin by understudylabs

Name: Install Codex Plugin
Rating: 4.2 (5 reviews)
Author: understudylabs

Install Codex Plugin

Compatibility shim for Codex installs. Use when a developer asks to install, update, enable, reinstall, remove, or verify the Understudy Codex plugin - "install Understudy in Codex", "add the Codex plugin", "make Codex see the skills". Route to install-agent-adapter with platform codex.

File contents

Install the Understudy Codex plugin

This skill is a compatibility shim. The consolidated setup surface is install-agent-adapter.

Procedure

Load install-agent-adapter and run it with platform codex.

Use its reference.md for the current marketplace registration:

codex plugin marketplace add "$REPO"

Activation is in Codex:

/plugins

Choose understudy-skills, install or enable understudy, then ask:

Use the Understudy onboarding skill for this project.

Safety Gates

Local-first and free: registering the Codex marketplace only makes local skills available. It must not authenticate, upload data, inspect secret values, download model weights, start hosted jobs, or make provider calls.

Do not claim the plugin is installed when only the marketplace is registered.
Do not edit ~/.codex/config.toml by hand unless the user explicitly asks.
Do not copy or fork skill content for Codex.

Resolve CLI

No Understudy CLI command is required. Use codex plugin marketplace add when available; otherwise show the manual /plugins activation path from install-agent-adapter/reference.md.

Output Standard

End with: that this routed through install-agent-adapter; whether the Codex marketplace was registered/refreshed/shown for manual run; the /plugins step; the next onboarding prompt; and the marketplace removal command.

Frequently asked questions