Browse reusable Agent Skills, each with a clear purpose and practical guidance.
Use when reviewing scripts, client components, bundles, or runtime behavior related to Parse JSON safely with error handling. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
Use when reviewing rendered HTML, interactive components, or design-system patterns related to Enable keyboard navigation for all elements. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
Use when reviewing rendered HTML, interactive components, or design-system patterns related to Use landmark regions correctly. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
Use when applies to all HTML documents. Check the `<html>` opening tag for a `lang` attribute with a non-empty, valid BCP 47 language code. Also check for `lang` attribute changes on individual elements when the document contains content in multiple languages (inline quotes, foreign terms, multilingual sections). The `lang` attribute is inherited — child elements inherit the language from their nearest ancestor with `lang`.
Use when auditing slow page loads, heavy assets, or rendering delays related to Optimize largest contentful paint. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes.
Use when auditing slow page loads, heavy assets, or rendering delays related to Implement lazy loading for offscreen content. Verify the actual bottleneck in DevTools, Lighthouse, or field data before recommending changes. Absence of `loading='lazy'` is not enough by itself when fold position is unknown.
Use when reviewing templates, rendered HTML, or shared components related to Check for broken links. Validate the final browser-facing markup, not just the source framework abstraction.
Use when reviewing dashboards, admin tables, search results, or feeds with many repeated items. Confirm the bottleneck is DOM or rendering cost before introducing virtualization because small lists usually do not need the added complexity.
Use when applies to HTML documents with `<li>` elements. Also applies to custom ARIA lists where `role='listitem'` must be owned by `role='list'`. Common violations occur in templating systems where list markup is split across components or in CSS resets where developers use `<li>` for layout without proper list parents.