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frontend_mastery

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Advanced React patterns, performance optimization, and state management rules.

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  1. Open your project in Codex.
  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/frontend-mastery-cityfish91159-maihouses/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/frontend-mastery/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Frontend Mastery Protocol (React + Vite + Tailwind)

1. Performance "Pro" Checklist

Before submitting any UI component, verify:

  • Re-renders: Are we re-rendering unnecessarily? Use React.memo or useCallback for stable props.
  • Lazy Loading: Are strict routes lazy-loaded? (React.lazy)
  • Image Optimization: Are images using proper formats (WebP/AVIF) and loading="lazy"?
  • Zustand Selectors: Are we selecting only what we need?
    • ❌ const { user, token } = useAuthStore()
    • ✅ const user = useAuthStore((s) => s.user)
  • Bundle Size: Did we import a huge library for one function? (e.g. import lodash vs lodash/debounce)

2. State Management Rules (Zustand + React Query)

  • Server State: MUST use React Query.
    • NEVER store server data in global Zustand store manually (unless caching for UI sync).
    • Use staleTime and cacheTime appropriately.
  • Client State: Use Zustand for global, useState for local.
    • Avoid "Prop Drilling" > 2 levels. Use Context or Zustand.

3. Architectectural Patterns

  • Container/Presenter: Separate logic (Hooks) from View (JSX).
    • Complex components should have a custom hook (e.g., useComponentLogic.ts).
  • Composition: Use children prop instead of passing components as props where possible.
  • Custom Hooks: Extract reusable logic immediately. useBoolean, useToggle, etc.

4. Code Quality & Formatting

  • Naming: use[Action] for hooks, handle[Event] for handlers.
  • CSS (Tailwind):
    • Group layout (flex, grid) first, then spacing, then visual (bg, text).
    • Use clsx or tailwind-merge for conditional classes.
    • NO inline styles (style={{}}) except for dynamic coordinates.

6. Error Boundaries

  • Critical UI parts MUST have an <ErrorBoundary>.
  • Async components (Suspense) must handle loading states gracefully.