Web Quality Skills

web-quality-skills by Addy Osmani (Google Chrome engineering) is a six-skill collection for optimizing web projects against Google Lighthouse methodology and Core Web Vitals: web-quality-audit (umbrella skill cross-linking the rest), performance, core-web-vitals (LCP/INP/CLS thresholds and fix patterns with framework examples), accessibility (WCAG 2.2 criteria and checklists), seo (technical and on-page), and best-practices (security, modern APIs). Each skill is a dense reference document the agent loads when the topic comes up — knowledge expansion rather than executable workflow. MIT licensed, tens of thousands of installs across the skills.sh ecosystem.

These are reference skills, not measurement tools: the agent still needs to run Lighthouse or WebPageTest itself to get real numbers, and a skill cannot replace judgment on trade-offs. Thresholds also drift as Google updates the specs, so the skill content needs the maintainer to stay current — it has been actively maintained through 2026.

Install all: npx skills add addyosmani/web-quality-skills, or per-skill: npx skills add addyosmani/web-quality-skills --skill performance. Also available as a Claude Code plugin marketplace and Gemini CLI extension.