Claude Code and Codex plugin marketplace for the existing agent skills

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
75/100
Issue type
Feature
Clarity
Clearly specified
Activity status
Active
Tech stack
javascript, react
Domain
developer-experience, tooling

Research direction

Start with skills/README.md and inspect the four end user skill directories named in the issue to confirm their layout. Then check Claude Code’s marketplace manifest requirements and add the proposed root .claude-plugin/marketplace.json pointing to those existing skills. Done when Claude Code can install the marketplace and lists all four skills; Codex support is described as optional and would need its own manifest.

Written by the indexing model from the issue text.

Description

docs status: waiting for maintainer
Search keywords

claude code plugin, marketplace, agent skills, codex

Summary

Material UI already ships agent skills in skills/ (see skills/README.md): material-ui-nextjs, material-ui-styling, material-ui-tailwind, material-ui-theming. The skills under .agents/skills (material-ui-review, mui-release) are maintainer workflows, so I have left them out.

What I couldn't find is a one-command install for Claude Code or Codex. Both can install a plugin from a git repository that carries a small marketplace file, and the file can point at skills a repo already has, so nothing needs copying or maintaining twice.

Proposal: add .claude-plugin/marketplace.json at the repo root, along these lines:

{
  "name": "material-ui",
  "owner": {
    "name": "MUI"
  },
  "description": "Material UI agent skills",
  "plugins": [
    {
      "name": "material-ui",
      "source": "./skills",
      "strict": false,
      "skills": [
        "./material-ui-nextjs",
        "./material-ui-styling",
        "./material-ui-tailwind",
        "./material-ui-theming"
      ],
      "description": "Material UI agent skills for Claude Code"
    }
  ]
}

Then claude plugin marketplace add <owner>/<repo> followed by claude plugin install material-ui@material-ui installs the skills. Codex has its own marketplace file (.agents/plugins/marketplace.json, documented at https://developers.openai.com/codex/plugins/build) and could be added the same way if you want it.

What I checked: I validated and installed exactly this manifest in Claude Code against a stand-in folder with the same layout and placeholder SKILL.md files named like yours; claude plugin details listed all 4 skills. Separately I installed Chakra UI's real skills/ through a different marketplace with a git-subdir source, and its three skills appeared with no change to Chakra's repo. I only read each skill's front matter and README to judge that they are meant for end users.

If you'd rather not carry a marketplace file, tell me and I won't pursue it. I'm not offering a PR unless you ask for one.

Drafted with Claude Code.

Examples

Chakra UI ships skills/ the same way, and its skills install as a plugin through the shape above (see What I checked).

Motivation

Agent users currently have to copy or script-install the skills; a marketplace entry makes it one command and keeps one source of truth.

Dominant language
JavaScript
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  4. Open a pull request that references the issue number.

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