redirect-chains
Use when auditing internal link structure after a URL migration, domain change, or site rebuild. Applies to any site that has had redirects in place for more than a month.
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Testing & Quality
Testing & Quality skills
Browse reusable Agent Skills, each with a clear purpose and practical guidance.
render-blocking
Use when auditing slow page loads, heavy assets, or rendering delays related to Eliminate render-blocking resources. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
73.22k repo starsObserved in 1 repos
Testing & Quality
resource-hints
Use when auditing slow page loads, heavy assets, or rendering delays related to Use resource hints for faster loading. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
73.22k repo starsObserved in 1 repos
Testing & Quality
responsive-images
Use when reviewing article images, cards, galleries, or any component rendered at multiple sizes across breakpoints. Check both the markup and the CSS layout because an incorrect `sizes` attribute can negate a perfectly good `srcset`.
73.22k repo starsObserved in 1 repos
Testing & Quality
responsive-size
Use when reviewing image assets, markup, and CDN or build transforms related to Serve images at the correct display size. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
73.22k repo starsObserved in 1 repos
Testing & Quality
retina-display
Use when reviewing image assets, markup, and CDN or build transforms related to Support high-DPI retina displays. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
73.22k repo starsObserved in 1 repos
Testing & Quality
runtime-validation
Use when reviewing code that calls fetch(), reads from localStorage, accesses process.env, or processes form submissions without explicitly validating the incoming data shape.
73.22k repo starsObserved in 1 repos
Testing & Quality
scheduler-yield
Use when reviewing JavaScript that performs synchronous loops over large datasets, recursive tree traversals, or bulk DOM updates that may exceed 50 ms on mid-range devices.
73.22k repo starsObserved in 1 repos
Testing & Quality
screen-reader-testing
Use when performing accessibility audits of web pages, components, or full user flows. Applies to all web content accessed via assistive technology. Particularly important for custom JavaScript widgets, single-page applications, dynamically updated content, modal dialogs, and forms with validation.
73.22k repo starsObserved in 1 repos
Testing & Quality