Agent Skills

SKILL.md packages that extend Claude Code, Cursor, Copilot, and other AI agents.

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Responsive Image Sizing

front-end-checklist

Checks image assets, markup, and build/CDN transforms to ensure images are served at appropriate display sizes using srcset and sizes to reduce wasted bandwidth

imagesperformancelighthouse

72,891

5 triggers

Performance Optimization

skillshub

Lighthouse-led web performance audits and actionable optimizations to reduce load time, improve Core Web Vitals, and cut total page weight.

performancelighthouseweb-vitals

5 triggers

Performance Benchmark (gstack)

gstack-ko

Run automated performance baselines and regression detection for web pages (TTFB, FCP, LCP, bundle sizes, requests) and compare against historical baselines.

performancebenchmarkingweb-vitals

6 triggers

Accessibility (a11y)

claude-code-templates

Audit and improve web accessibility using WCAG 2.1 and Lighthouse best-practices—covers alt text, contrast, keyboard navigation, ARIA usage, captions, and testi

accessibilitya11ywcag

29,459

6 triggers