Claude-Codex Skills

A compact marketplace of standalone engineering skills for Claude Code and Codex.

Why this repository is intentionally small: Earlier coding models needed a large orchestration and evaluation harness to follow complex workflows reliably. Modern Claude and Codex models work better with concise procedural guidance, so that machinery has been removed. These skills retain only the domain knowledge, decision gates, tool guidance, and evidence checklists worth bringing into context.

Browse the skills catalog or install only the plugins you need below.

The repository intentionally contains only the skills, minimal plugin manifests, two host-specific marketplace catalogs, documentation, and a static catalog site. It has no MCP servers, orchestration hierarchy, distributed shared resources, generated skill copies, or evaluation harness.

Plugins

Review Suite

Index	Skill	Purpose
11	Plan Reviewer	Validate an implementation plan against repository evidence before execution.
12	Delivery Reviewer	Review completed code through independent risk-selected perspectives.

Codebase Audit Suite

Index	Skill	Purpose
21	Documentation Auditor	Audit documentation trust, coverage, structure, and factual accuracy.
22	Codebase Auditor	Audit cross-cutting code health, security, delivery, and maintainability.
23	Test Suite Auditor	Audit test value, coverage, isolation, and oracle strength.
24	Architecture Auditor	Audit system boundaries, ownership, contracts, and dependency topology.
25	Persistence Auditor	Audit queries, transactions, consistency, and resource lifecycle.

Optimization Suite

Index	Skill	Purpose
31	Performance Optimizer	Profile, experiment, and keep only measured improvements.
32	Dependency Upgrader	Upgrade dependencies in reversible, verified batches.
33	Code Modernizer	Replace or simplify bounded capabilities when net value is proven.
34	Benchmark Comparator	Compare alternatives with a frozen, reproducible experiment contract.

Testing Suite

Index	Skill	Purpose
41	Test Strategy Planner	Design a risk-based, decision-complete test strategy without changing code.
42	Acceptance Test Builder	Create reproducible acceptance tests through observable product boundaries.

Product Discovery Suite

Index	Skill	Purpose
51	Opportunity Evaluator	Compare product opportunities using current evidence and a low-cost validation path.

Maintainer Suite

Optional toolkit for people who maintain skill or plugin repositories and other GitHub projects. Users who only consume the engineering skills do not need to install it.

Index	Skill	Purpose
61	Skill Reviewer	Review standalone skills and configured distribution surfaces before publication.
62	Repository Publisher	Validate, commit, push, and remotely verify approved repository changes.
63	Release Publisher	Prepare and publish an approved tagged GitHub release.
64	Community Announcer	Draft and publish fact-checked GitHub Discussions project announcements.

Install in Claude Code

Add the marketplace and install only the suites you need:

/plugin marketplace add levnikolaevich/claude-code-skills
/plugin install review-suite@levnikolaevich-skills-marketplace
/plugin install codebase-audit-suite@levnikolaevich-skills-marketplace
/plugin install optimization-suite@levnikolaevich-skills-marketplace
/plugin install testing-suite@levnikolaevich-skills-marketplace
/plugin install product-discovery-suite@levnikolaevich-skills-marketplace
/plugin install maintainer-suite@levnikolaevich-skills-marketplace

For local development, load one plugin directly:

claude --plugin-dir ./plugins/review-suite

Install in Codex

codex plugin marketplace add levnikolaevich/claude-code-skills
codex plugin add review-suite@levnikolaevich-skills-marketplace
codex plugin add codebase-audit-suite@levnikolaevich-skills-marketplace
codex plugin add optimization-suite@levnikolaevich-skills-marketplace
codex plugin add testing-suite@levnikolaevich-skills-marketplace
codex plugin add product-discovery-suite@levnikolaevich-skills-marketplace
codex plugin add maintainer-suite@levnikolaevich-skills-marketplace

Repository layout

.
├── .agents/plugins/marketplace.json       # Codex catalog
├── .claude-plugin/marketplace.json        # Claude Code catalog
└── plugins/
    ├── review-suite/
    ├── codebase-audit-suite/
    ├── optimization-suite/
    ├── testing-suite/
    ├── product-discovery-suite/
    └── maintainer-suite/

Each plugin contains .codex-plugin/plugin.json for Codex and a shared skills/<skill>/SKILL.md tree used by both hosts.

This is the smallest practical shared layout for distributed plugins:

• Both hosts use skills/<name>/SKILL.md, so each skill has one canonical copy.
• Codex requires .codex-plugin/plugin.json for a plugin.
• Claude Code can expose a standard skills/ directory from the marketplace entry, so duplicate per-plugin Claude manifests are unnecessary here.
• agents/openai.yaml, references, scripts, assets, hooks, agents, and MCP configuration are optional and omitted until a concrete need appears.

The structure follows the current official Codex skill guide, Codex plugin guide, Claude Code skill guide, and Claude Code plugin reference.

Indexing

The first digit identifies the plugin and the second identifies the skill within it: 1x review, 2x audit, 3x optimization, 4x testing, 5x product discovery, and 6x repository maintenance. See the canonical allocation and overflow rules in AGENTS.md.

License

MIT