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core-web-vitals

Skill0 starsChanged 28 days agoMITView on GitHub

Use for page speed and Core Web Vitals, for example "is my site fast", "check my Core Web Vitals", "why is my LCP slow", "has my page speed improved", "PageSpeed score for this page". Reads real-user field data, its history over time, and lab tests. Not for a full site audit (use site-audit).

33 other projects use a version of this.

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Projects with it also use javascript-seo, web-quality-audit and 10 more.

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The file

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SKILL.md

Core Web Vitals

Why: field data is what Google measures from real Chrome users, and a single lab run can mislead in either direction.

Rules that come first

  1. Name the source of every number. Field data is real Chrome users over 28 days at the 75th percentile. A lab test is one simulated load.
  2. no_field_data means too little Chrome traffic to publish. It is neither a failure nor a zero. A metric Google did not return is unknown, never zero.
  3. A trend claim needs the periods shown, or the words "insufficient data". Never promise a ranking gain from a speed fix.
  4. gravity_geo_pagespeed saves its snapshot in the workspace as soon as it runs, with no preview. Say so before calling it. It changes nothing on the site.

Steps

  1. Field data today: gravity_cwv_field with url or origin and a form_factor. Report LCP, INP, CLS and TTFB with the good, needs-improvement and poor shares.
  2. History: crux_query_history with the same url or origin in body. Report the direction across the collection periods it returns.
  3. Lab: gravity_geo_pagespeed when no field data exists or a specific page needs a diagnosis. Keep it clearly separate from field data.
  4. Status unconfigured: say this check is not enabled on the deployment yet, and offer the other source. Never make up a number.
  5. Finish with the worst metric, the likely cause from the result, and how the user will know it worked.

Check

The lead's eval proves this skill when the reply calls gravity_cwv_field first, labels the data as field data, and treats no_field_data as neither a failure nor a zero.

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