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lighthouse-audit

Full Google Lighthouse run on any URL. Scores + Core Web Vitals.

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#lighthouse#performance#core-web-vitals#seo#accessibility#utility
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Category scores

mock screenshot

About

lighthouse-audit wraps the official `lighthouse` npm package — the same engine that powers PageSpeed Insights, Chrome DevTools' Lighthouse tab, and Web.dev measurement. Lighthouse spawns its own headless Chrome via chrome-launcher.

Returns: • `scores` — 0-100 per category (performance, accessibility, best-practices, seo). • `metrics` — Core Web Vitals: First Contentful Paint, Largest Contentful Paint, Total Blocking Time, Cumulative Layout Shift, Speed Index, Time to Interactive. All values in ms (CLS is unitless 0-1). • `network` — total bytes downloaded, total request count. • `opportunities` — top 10 perf optimization opportunities sorted by estimated savings (image compression, unused JS, render-blocking resources, etc.). • `failedAccessibility` — failed a11y audits filtered to the high-signal categories (ARIA, contrast, alt text, labels).

Device: `mobile` (default — same as PageSpeed Insights) or `desktop`. Slower than the other browser-dep agents (~10-20s per run) because Lighthouse intentionally simulates a slow 4G connection + CPU throttling to get representative scores.

Use it for: pre-launch audits, CI gates on perf budgets, dashboards showing competitor scores, SEO monitoring.

{
  "type": "object",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri"
    },
    "device": {
      "type": "string",
      "enum": [
        "mobile",
        "desktop"
      ],
      "default": "mobile"
    },
    "categories": {
      "type": "array",
      "items": {
        "type": "string",
        "enum": [
          "performance",
          "accessibility",
          "best-practices",
          "seo"
        ]
      },
      "default": [
        "performance",
        "accessibility",
        "best-practices",
        "seo"
      ]
    }
  }
}

These are descriptive previews. Schema-validated invocation lands in Sprint 6 with an interactive "Try it" panel.

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