web-quality-skills

Why use it

Key features

6 skills covering the Lighthouse + Core Web Vitals matrix
Explicit targets: LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1
WCAG 2.2 accessibility auditing
Framework-agnostic recommendations
Auto-activation on matching requests

Live Demo

What it looks like in practice

web-quality-skill.replay ▶ ready

0/0

Install

Author repository · Claude Skills documentation

Use Cases

Real-world ways to use web-quality-skills

Fix a slow LCP on a product landing page

👤 Frontend engineers trying to get a green CWV ⏱ ~40 min intermediate

When to use: CrUX shows LCP at 3.8s and you don't know where to start.

Prerequisites

Target URL — Live or staging URL — not just local

Flow

Run the core-web-vitals skill

Use the core-web-vitals skill on https://site.com. Focus on LCP.✓ Copied

→ Diagnosis of the LCP element (hero image, web font, server response) with specific fix
Apply the fix

Apply the recommended priority hints and image format change.✓ Copied

→ Concrete HTML changes
Re-measure

How do I verify the improvement?✓ Copied

→ Guided re-measure via Lighthouse or web-vitals JS

Outcome: LCP under the 2.5s target with a documented fix path.

Pitfalls

Fixing lab LCP but not field LCP (CrUX) — Always verify in CrUX, not just local Lighthouse

Run a WCAG 2.2 accessibility audit on a checkout flow

👤 Engineers preparing for an accessibility review ⏱ ~45 min intermediate

When to use: Legal is asking about WCAG compliance for the checkout.

Flow

Run the accessibility skill

Use the accessibility skill on our checkout flow. What WCAG 2.2 issues exist?✓ Copied

→ Structured findings per WCAG success criterion with severity
Prioritize fixes

Group by fix-effort vs user impact.✓ Copied

→ Ordered backlog

Outcome: A real accessibility backlog, not a checklist you can't act on.

Pitfalls

Automated checks only catch ~30% of issues — Complement with keyboard-only and screen-reader manual testing

Combine with: playwright-skill

Run the full web-quality-audit before a marketing campaign

👤 Teams about to drive paid traffic ⏱ ~30 min intermediate

When to use: Big campaign starts Monday and you want no nasty surprises.

Flow

Run the combined audit

Use web-quality-audit on our campaign landing page.✓ Copied

→ Report spanning performance, CWV, accessibility, SEO, best-practices
Triage for launch

What must be fixed before launch vs can wait?✓ Copied

→ Go/no-go triage

Outcome: A launch-ready page and a week-2 backlog.

Pitfalls

Treating every finding as blocker — The skill prioritizes — trust the must-fix list

Combinations

Pair with other MCPs for X10 leverage

web-quality-skill + chrome-devtools

Use DevTools MCP to grab live perf traces while the skill interprets them

Capture a perf trace via chrome-devtools, then have the performance skill analyze it.✓ Copied

web-quality-skill + playwright-skill

Playwright runs the site through real user flows, web-quality skills score each step

Use playwright to walk through checkout, capture metrics at each step, then accessibility-audit each screen.✓ Copied

web-quality-skill + claude-seo-skill

Technical SEO from claude-seo + CWV from this skill

Run /seo audit for link/schema issues, then web-quality-audit for CWV.✓ Copied

Tools

What this MCP exposes

Tool	Inputs	When to call
web-quality-audit	URL	Pre-launch or quarterly
performance	URL	Slow page
core-web-vitals	URL	Failing CWV
accessibility	URL / component	A11y review
seo	URL	SEO hygiene check
best-practices	URL	Hardening review

Cost & Limits

What this costs to run

API quota: None
Tokens per call: 2-5k per skill loaded
Monetary: Free — skill is local
Tip: Audit one URL at a time; batch audits balloon context.

Security

Permissions, secrets, blast radius

Credential storage: No credentials — skill is prompts

Data egress: None from the skill itself

Troubleshooting

Common errors and fixes

Skill gives generic advice

Feed in a real Lighthouse JSON or CrUX record for specific findings.

Recommendations don't apply to your framework

Name the framework ('Next.js 15 app router') so the skill tailors suggestions.

Alternatives