Browse reusable Agent Skills, each with a clear purpose and practical guidance.
Use when reviewing CI coverage, automated checks, or test strategy related to Use visual regression testing. Focus on whether the rule is continuously verified, not just documented.
Use when reviewing templates, rendered HTML, or shared components related to Validate HTML against W3C standards. Validate the final browser-facing markup, not just the source framework abstraction.
Use when applies to any site with more than 20 pages. Use when auditing site architecture, investigating why certain pages underperform in search, or after a site migration.
Use when reviewing templates, rendered HTML, or shared components related to Link a Web App Manifest for installability. Validate the final browser-facing markup, not just the source framework abstraction.
Use when reviewing scripts, client components, bundles, or runtime behavior related to Use Web Storage API safely. Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
Use when reviewing stylesheets, component styles, and responsive behavior related to Optimize web font formats. Check the rendered layout across breakpoints and interaction states before proposing a fix.
Use when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
Use when reviewing templates, rendered HTML, or shared components related to Analyze performance with WebPageTest. Validate the final browser-facing markup, not just the source framework abstraction.
Use when applies to sites with internal site search functionality. Use when optimizing branded search result appearance or adding structured data for the first time.
Use when applies to key landing pages, blog posts, product pages, and any page targeting competitive queries. Use when diagnosing poor rankings or after a Google Helpful Content update.