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Install: npm install --save-dev @testing-library/react @testing-library/dom. Recommended extras: @testing-library/user-event and @testing-library/jest-dom. React 19 requires v16.1.0+.

Build robust, scalable design systems that ensure visual consistency and exceptional user experiences.

Build reusable application circuits, not generated IC wrappers. A good reference design captures the support circuitry, default mode, key equations, layout-sensitive notes, and evidence needed to use the part confidently.

Comprehensive patterns for building accessible UI component libraries with shadcn/ui and Radix Primitives. Covers CVA variants, OKLCH theming, cn() utility, component extension, asChild composition, dialog/menu patterns, and data-attribute styling. Each category has individual rule files in rules/ loaded on-demand.

Comprehensive performance optimization guide for React applications, containing 12 rules across 6 categories. Rules are prioritized by impact to guide automated refactoring and code generation.

Follow these guidelines to create performant, reusable, and testable Composables.

Material-UI v7 (released March 2025) patterns for component usage, styling with sx prop, theme integration, and responsive design.

One job: Tell a new user what AgentOps does and what to do first. Fast.

These are instructions for creating design philosophies - aesthetic movements that are then EXPRESSED VISUALLY. Output only .md files, .pdf files, and .png files.

Use this skill to create a new App Store Connect app by driving the web UI. This is opt-in, local-only automation that requires the user to be signed in.