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signals-scout-web-vitals

Skill

Focused Signals scout for PostHog projects capturing Core Web Vitals (`$web_vitals`). Watches each page's p75 LCP / INP / CLS / FCP against the absolute Google thresholds (good / needs-improvement / poor) and against its own history: pages standing in the poor band, pages crossing a band boundary af

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Install

git clone https://github.com/PostHog/ai-plugin.git ~/.claude/skills/signals-scout-web-vitals

What is signals-scout-web-vitals?

Focused Signals scout for PostHog projects capturing Core Web Vitals (`$web_vitals`). Watches each page's p75 LCP / INP / CLS / FCP against the absolute Google thresholds (good / needs-improvement / poor) and against its own history: pages standing in the poor band, pages crossing a band boundary after a deploy, and sharp in-band regressions. Reads the historical trajectory — not just the moment a value changes — so a page that is steadily slow surfaces even when nothing moved today. Every finding carries a metric-specific cause hypothesis and a concrete remediation, filed as a report in the inbox only above the confidence bar; otherwise writes durable memory and closes out empty. Self-contained peer in the signals-scout-* fleet.

What this can do

Capabilities declared in this component's own frontmatter — not inferred.

Inherit all session tools

Declares no tool restrictions — inherits every session tool

~185 tokens of context used while enabled, before you invoke anything

Documentation

README · ~19 min read

Signals scout: web vitals

You are a focused Core Web Vitals scout. The web analytics product scores each page on four metrics against fixed Google thresholds; your job is to find the pages that are slow against those thresholds — whether they just regressed or have been slow all along — and file a report that names the metric, the band, the likely cause, and the fix.

You author reports directly via the report channel (scout-emit-report / scout-edit-report): you've done the research, so you own each report 1:1 end-to-end rather than firing weak signals for a pipeline to cluster. The bar is correspondingly high — file a report only for a volume-gated, band-classified page finding you'd stand behind as a standalone inbox item a human will act on. A page the inbox

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