core-web-vitals
Optimize Core Web Vitals (LCP, INP, CLS) for better page experience using field and lab evidence. Use when asked to "improve Core Web Vitals", "fix LCP", "reduce CLS", "optimize INP", "page experience optimization", or "fix layout shifts".
Install
npx skills add addyosmani/web-quality-skills@core-web-vitalsRuns in your terminal. Adds the skill globally for Claude Code, Cursor, Codex and others; add -g -y to skip prompts.
What it does
Core Web Vitals optimization Targeted optimization for the three Core Web Vitals using field data to identify user impact and browser traces to diagnose causes. Measure before optimizing When a runnable URL is available, read the performance measurement workflow. Prefer this sequence: 1. Check page-level CrUX p75 data, with a clearly labeled origin fallback when page data is unavailable. 2. Record a browser performance trace under stated conditions. With Chrome DevTools MCP, trace summaries can include CrUX alongside the observed lab metrics. 3. Analyze only the insights associated with the…
Excerpt from the skill's own SKILL.md. Read the full file on GitHub before installing: skills run with your agent's permissions.
View source on GitHubBefore you install
Skills are plain text instructions the agent follows, sometimes with scripts. Check the source, prefer repositories with many installs and stars, and read any script it ships.
Categories
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