Core Web Vitals

This one walks you through fixing Google's Core Web Vitals: LCP (loading speed), INP (interaction responsiveness), and CLS (layout stability). It covers the current thresholds (like LCP under 2.5s, INP under 200ms), explains what's breaking each metric, and gives you specific fixes like deferring render-blocking resources, setting image dimensions to prevent shifts, and breaking up long JavaScript tasks. The initial assessment checks your project context files for the site URL, which is a nice touch. It's essentially a diagnostic checklist that knows when to pull in related skills for image optimization or rendering strategies. Saves you from piecing together fragmented PageSpeed Insights recommendations.

Install to Claude Code

npx -y skills add kostja94/marketing-skills --skill core-web-vitals --agent claude-code