feat: add rstack Codex plugin

[SoonIter]

Summary

This PR lets Codex users install all public Rstack skills as one plugin:

codex plugin marketplace add rstackjs/agent-skills
codex plugin add rstack@rstack-skills

Why this layout

The skill source already lives in skills/. We compared three ways to package it as a plugin.

Copy

Used by openai/plugins:

agent-skills/
├── skills/                   # source
└── plugins/rstack/skills/    # second copy

Simple to package, but every skill is stored twice and the copies can get out of sync.

Symlink

Used by callstackincubator/agent-skills:

agent-skills/
├── skills/
└── plugins/rstack/skills/
    └── rspack-best-practices -> ../../../skills/rspack-best-practices

Avoids copies, but installation depends on symlink support.

Chosen: repository root

Used by obra/superpowers and this PR:

agent-skills/
├── .codex-plugin/plugin.json         # uses ./skills/
├── .agents/plugins/marketplace.json  # uses ./
└── skills/                           # single source

This keeps one copy of each skill and does not require symlinks. If a separate distribution bundle is needed later, it can be generated during publishing.

Related Links

• https://github.com/openai/plugins
• https://github.com/callstackincubator/agent-skills
• https://github.com/obra/superpowers

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: e74304e451

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds Codex plugin support for the rstack-skills repository. It introduces a .codex-plugin/plugin.json manifest defining plugin metadata, skills entry point, and interface configuration with default prompts, along with a .agents/plugins/marketplace.json file registering the plugin under a marketplace with installation and authentication policies. The .gitignore file is updated to explicitly track the new marketplace configuration files. The README's Usage section is updated with instructions for installing all skills as a Codex plugin via marketplace and plugin add commands.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: adding the Rstack Codex plugin.
Description check	✅ Passed	The description matches the changeset and explains the new Codex plugin packaging and install flow.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat-codex-rstackjs-plugin

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[Copilot]

Pull request overview

This PR introduces a Codex plugin manifest and a repo-local Codex plugin marketplace entry so Codex can install the repository’s public skills/ set as an installable plugin, and documents the installation steps in the README.

Changes:

• Document Codex plugin installation commands in README.md.
• Add a Codex plugin manifest at .codex-plugin/plugin.json that points to ./skills/.
• Add a repo-local plugin marketplace file at .agents/plugins/marketplace.json and update .gitignore to keep it tracked.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
README.md	Adds Codex plugin install instructions alongside existing npx skills add usage.
.gitignore	Ensures the repo-local Codex plugin marketplace file remains tracked despite .agents/*** ignores.
.codex-plugin/plugin.json	Declares the rstackjs Codex plugin and exposes ./skills/ as the skills source.
.agents/plugins/marketplace.json	Adds a marketplace named rstack-skills with a single rstackjs plugin entry pointing at the repo.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.