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Testing & Code Quality Skills for Claude Code
Keep an agent honest about its own work — test-driven development, code review, E2E browser testing, clone verification, and the discipline of proving a change before claiming it done.
About this collection
This collection gathers every testing & code quality skill we've evaluated for Claude Code and AI coding agents — 7 skills so far, each scored on the same six-dimension rubric: trigger quality, structure, workflow design, content, engineering, and security.
Every skill below is free and open source. Install any of them in one line with curl -fsSL https://skill123.me/install/<skill>.sh | bash, or open a skill's page to see its full scorecard, documentation, and all install methods before you download.
code-reviewer
Developer Tools
Analyzes code diffs and files to identify bugs, security vulnerabilities (SQL injection, XSS, ins…
9.4
code-review
Developer Tools
Review the changes since a fixed point (commit, branch, tag, or merge-base) along two axes: Stand…
9.3
replica-diff
Developer Tools
Compares an app clone against the original: a feature parity score from the feature matrix (weigh…
9.2
test-driven-development
Developer Tools
Use when implementing any feature or bugfix, before writing implementation code
9.1
verification-before-completion
Productivity
Use when about to claim work is complete, fixed, or passing, before committing or creating PRs - …
9.1
replica-test
Developer Tools
Clicks through every flow of an app clone and tests it for bugs: a test plan generated from the r…
9.1
playwright-skill
Developer Tools
Complete browser automation with Playwright. Auto-detects dev servers, writes reusable test scrip…
9.0