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agent-skills/docs/codex-setup.md
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Federico Bartoli 41f6a03a59 docs(codex): update install command for Codex CLI v0.122+
In Codex CLI 0.122 the marketplace subcommand moved from
`codex marketplace` to `codex plugin marketplace`. Update README and
docs/codex-setup.md so install snippets work on current Codex (verified
on 0.128.0). Keep one historical reference in the v0.122 callout.
2026-07-08 15:39:36 +02:00

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Using agent-skills with Codex

This repository is also a Codex plugin. The same skills/ directory used by Claude Code is consumed by Codex — no files are copied or duplicated.

Install (one command)

codex plugin marketplace add addyosmani/agent-skills

Requires Codex CLI v0.122 or later. On older releases the command was codex marketplace add. See the Codex CLI docs.

Codex clones the repo into ~/.codex/plugins/agent-skills/, registers the marketplace in ~/.codex/config.toml, and makes the plugin available. Restart Codex if it's already running.

Local clones work too:

codex plugin marketplace add /path/to/your/clone

Usage

After install, invoke a skill in Codex chat with @ (e.g. @spec-driven-development) or just describe the task and let Codex pick the right skill. All 21 skills under skills/ are available.

How it works

  • codex/.codex-plugin/plugin.json — Codex plugin manifest. Points skills at ./skills/.
  • codex/skills — git-tracked symlink to ../skills (9 bytes, mode 120000). Keeps the plugin directory self-contained without duplicating the skills themselves. macOS and Linux handle this natively.
  • .agents/plugins/marketplace.json — marketplace entry declaring the plugin at ./codex. Codex requires plugins to live in a subdirectory of the marketplace root.
  • skills/<name>/SKILL.md — unchanged. Codex and Claude Code share the same name + description frontmatter format, so one file serves both platforms.

Slash commands in .claude/commands/ and personas in agents/ stay Claude Code-specific — Codex has no native equivalent for either. On Codex, invoke the underlying skill directly instead of the slash command (e.g. @spec-driven-development instead of /spec).

If symlinks don't work on your machine, replace the symlink with a real copy of the skills inside the plugin directory. Run this from the repo root after cloning:

rm codex/skills
cp -R skills codex/skills

This is a local-only change — don't commit it. The upstream repo keeps the symlink so codex plugin marketplace add addyosmani/agent-skills stays a one-liner for everyone else.