css-noop-checker

Use when verifying a CSS noop rule against real Chromium behavior, checking rule correctness and e2e/unit test consistency. Triggers on "verify rule", "check rule", "re-verify", or reviewing rule accuracy after changes.

Implement a feature then iterate with architect, frontend lead, devil's advocate, and code reviewer reviews (×3 rounds)

React composition patterns that scale. Use when refactoring components with boolean prop proliferation, building flexible component libraries, or designing reusable APIs. Triggers on tasks involving compound components, render props, context providers, or component architecture. Includes React 19 API changes.

React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.