Claude Code Skills

by levnikolaevich 525 MIT Updated Jul 30, 2026
Testing Claude CodeCodex
Claude Code Skills skill by levnikolaevich
Claude Code Skills — Testing skill by levnikolaevich

Claude Code Skills is an open-source testing skill for Claude Code and Codex, published by levnikolaevich. Its author describes it as: “18 standalone skills for Claude Code and Codex: review, audit, optimization, testing, product discovery, and safe repository publishing.”. The project has 525 stars on GitHub and is available under the MIT license. Add it to your setup with `/plugin marketplace add levnikolaevich/claude-code-skills`.

Installation

Add Claude Code Skills to your agent with:

/plugin marketplace add levnikolaevich/claude-code-skills

Always review a skill's source before installing it. This command comes from the skill's public repository; the linked repo is the source of truth for exact setup steps.

When to use it

Reach for Claude Code Skills when you want testing help from Claude Code without writing the same instructions every session. Load the skill and the agent picks it up automatically for relevant tasks.

Strengths

  • Clear MIT license — safe to read and adapt
  • Established project with 525 GitHub stars
  • Declares compatibility with Claude Code, Codex
  • Actively maintained (recent commits)

Topics

agent-skillsai-agentsanthropicclaude-codeclaude-code-skillscode-reviewcodebase-auditcodexdeveloper-productivitydeveloper-toolsgithub-actionsopenaiperformance-optimizationplugin-marketplaceproduct-discoverysoftware-architecturetesting

Frequently asked questions

What does Claude Code Skills do?
18 standalone skills for Claude Code and Codex: review, audit, optimization, testing, product discovery, and safe repository publishing.
How do I install Claude Code Skills?
Run /plugin marketplace add levnikolaevich/claude-code-skills in your agent, then reload your skills. Review the source at https://github.com/levnikolaevich/claude-code-skills before installing.
Is Claude Code Skills free to use?
Yes. Claude Code Skills is free and open source under the MIT license, so you can read, run, and adapt it within that license's terms.
Which agents does Claude Code Skills work with?
Claude Code Skills declares compatibility with Claude Code and Codex. Agent Skills use a portable SKILL.md format, so other compatible clients can usually load it too.

Related skills

More Testing →

Test web applications with screen readers including VoiceOver, NVDA, and JAWS. Use when validating screen reader compatibility, debugging accessibility issues, or ensuring assistive technology support.

39k wshobson MIT

Test Temporal workflows with pytest, time-skipping, and mocking strategies. Covers unit testing, integration testing, replay testing, and local development setup. Use when implementing Temporal workflow tests or debugging test failures.

39k wshobson MIT

Test smart contracts comprehensively using Hardhat and Foundry with unit tests, integration tests, and mainnet forking. Use when testing Solidity contracts, setting up blockchain test suites, or validating DeFi protocols.

39k wshobson MIT

Create, edit, validate, and run Agent QA tests, suites, and hooks through MCP or CLI while preserving canonical IDs and schema contracts.

45k sickn33 MIT

Debug, patch, and verify failed Agent QA runs from MCP evidence, artifacts, logs, and local code without hiding product or infrastructure defects.

45k sickn33 MIT