SolidMITOriginal

Core Web Vitals Check

Runs Lighthouse against homepages (or specific pages) across a portfolio — reports LCP, CLS, INP, and regressions.

Entry verified April 20, 2026

The short answer

Core Web Vitals are a ranking factor. This skill runs Lighthouse across your portfolio in one pass and flags anything that's regressed from your baseline.

When to use it

Monthly. After major frontend changes. Before a redesign ships.

Setup

  1. 1

    Save as ~/.claude/commands/vitals.md.

  2. 2

    Lighthouse CLI required (npm i -g lighthouse).

  3. 3

    Invoke: /vitals [site-name].

Example

You: /vitals
Claude: 12 sites. Performance: 9 green, 2 orange, 1 red. Red: readingcurator.com LCP 4.2s (hero image not optimised). Fix list attached.

Source & attribution

Author
Bryan Collins
Licence
MIT
Type
Original

Original pattern published under MIT — attribution preserved by convention, not licence requirement.

Caveats

Lighthouse scores vary between runs — trust trend, not single values.

Related skills

SEO Audit

Runs a full on-page SEO audit on a URL or page file — title, meta, H1, schema, internal links, content gaps.

Site Health Check

Runs a battery of drift/regression checks on a site — CTA hygiene, data freshness, link health, cruft in pages/.

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