Diagnose and fix the three Core Web Vitals metrics that impact search ranking and user experience.
Create detailed user stories, acceptance criteria, and feature specs
Example: Generate user stories for 'password reset feature' with acceptance criteria, edge cases, and test scenarios
Reduce spec writing time by 50%, ensure comprehensive coverage
Research competitors, compare features, identify gaps
Example: Analyze 5 competitor products, create feature comparison matrix, suggest differentiation opportunities
Complete competitive research in 2 hours instead of 2 days
Evaluate features using frameworks (RICE, ICE, Kano) and create prioritized backlogs
Example: Score 20 feature ideas using RICE framework, generate prioritized roadmap with rationale
Make data-driven prioritization decisions faster
Draft PRDs, status updates, and stakeholder presentations
Example: Create executive summary of Q3 roadmap, monthly progress report, feature launch announcement
Save 3-5 hours/week on communication overhead
Submit your Claude Code skill and start earning
epx add addyosmani/web-quality-skills --skill core-web-vitalsCompatible with
Supported agents
Covers LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift) with specific thresholds and optimization strategies for each
Includes common causes, code examples, and debugging scripts for identifying bottlenecks in loading, interactivity, and visual stability
Provides framework-specific quick fixes for Next.js, React, and Vue/Nuxt, plus measu
AI-first code editor with Composer
Before installing skills in Cursor, ensure your development environment meets these requirements:
node --versioncore-web-vitalsExecute the skills CLI command in your project's root directory to begin installation:
epx add addyosmani/web-quality-skills --skill core-web-vitalsFetches core-web-vitals from addyosmani/web-quality-skills and configures it for Cursor.
The CLI shows a list of agents. Use arrow keys and space to select Cursor:
Confirm successful installation by checking the skill directory location:
.cursor/skills/core-web-vitals
Restart Cursor to activate core-web-vitals. Access via /core-web-vitalsin your agent's command palette.
Learn more:View source on GitHubSkills CLI docsAbout CursorWhat are agent skills?
Time estimate: 30-60 minutes to see productivity improvements
Prerequisites
Steps
Common Pitfalls
✓ Do
✗ Don't
💡 Pro Tips
✓ Use when
Use for user story writing, competitive research, roadmap prioritization, stakeholder communication, and PRD drafting. Best for reducing repetitive documentation and research work.
✗ Avoid when
Avoid for strategic product vision (requires deep customer empathy), pricing decisions (needs market and financial expertise), or when face-to-face customer discovery is more valuable than speed.
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Solid pick for teams standardizing on skills: core-web-vitals is focused, and the summary matches what you get after install.
Solid pick for teams standardizing on skills: core-web-vitals is focused, and the summary matches what you get after install.
Registry listing for core-web-vitals matched our evaluation — installs cleanly and behaves as described in the markdown.
core-web-vitals is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
core-web-vitals has been reliable in day-to-day use. Documentation quality is above average for community skills.
core-web-vitals reduced setup friction for our internal harness; good balance of opinion and flexibility.
core-web-vitals fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
core-web-vitals has been reliable in day-to-day use. Documentation quality is above average for community skills.
I recommend core-web-vitals for anyone iterating fast on agent tooling; clear intent and a small, reviewable surface area.
Useful defaults in core-web-vitals — fewer surprises than typical one-off scripts, and it plays nicely with `npx skills` flows.
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