...It encodes knowledge drawn from Google Lighthouse audits, Core Web Vitals heuristics, WCAG accessibility guidelines, and real-world engineering experience, allowing coding agents to automatically assess and suggest improvements. These skills are framework-agnostic, meaning they apply to React, Vue, Svelte, Angular, Astro, or even plain HTML projects. For example, an agent can use these skills to audit a page’s performance, identify bottlenecks in loading speed, fix layout shift issues, suggest accessibility enhancements, or recommend SEO improvements. ...