Skill Claude CodeCodex
Lazy senior dev mode. YAGNI extremist — deletion before addition, shortest working diff wins. Use before writing code: challenge the requirement, reuse, stdlib, one-liner, then minimum code. Mark deliberate simplifications with a ponytail: comment.
Skill Claude CodeCodex
Progressive Web Apps - service workers, caching strategies, offline, Workbox.
Skill Claude CodeCodex
Use when you need to resolve an in-progress git merge/rebase conflict.
Skill Claude CodeCodex
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
Skill Claude CodeCodex
Use when implementing any feature or bugfix, before writing implementation code.
Skill Claude CodeCodex
UI/UX design intelligence for web and mobile. Trigger with "design UI", "create component", "build landing page", "build dashboard", "choose color", "pick font", "check accessibility", "review UX", "add animation", "responsive design", "dark mode", or when designing new pages, creating UI components, choosing color…
Skill Claude CodeCodex
React/Next.js performance optimization + composition patterns from Vercel Engineering. Covers 70+ rules: eliminating waterfalls, bundle optimization, server performance, re-render optimization, rendering performance, JS performance, advanced patterns, plus compound components, state management, React 19 APIs. Use for…
Skill Claude CodeCodex
Use when about to claim work is complete, fixed, or passing, before committing or creating PRs - requires running verification commands and confirming output before making any success claims; evidence before assertions always.
Skill Claude CodeCodex
Deep Core Web Vitals and page speed audit using Chrome DevTools MCP. Measures LCP, INP, CLS, FCP, TTFB, TBT, Speed Index. Identifies render-blocking resources, network chains, layout shifts, caching issues, accessibility gaps. Use for performance audit, optimization, Lighthouse scores, site speed. Biases towards…
Skill Claude CodeCodex
Use when you have a spec or requirements for a multi-step task, before touching code.
Skill Claude CodeCodex
Use when creating new skills, editing existing skills, or verifying skills work before deployment.