core-web-vitals
Measures and remediates LCP, INP, and CLS with evidence from lab/field tools. Use when page experience or CWV regressions are suspected or reported.
Works with
---
name: core-web-vitals
description: Measures and remediates LCP, INP, and CLS with evidence from lab/field tools. Use when page experience or CWV regressions are suspected or reported.
license: MIT
---
# Core Web Vitals
## Overview
Measure first, then fix the vitals that evidence shows are failing.
## When to Use
- Slow LCP, poor INP, layout shift, PSI/CrUX regressions
**Not for:** Inventing scores without tool output.
## Official sources
- https://developers.google.com/search/docs/appearance/core-web-vitals
- https://developers.google.com/search/docs/appearance/page-experience
## Process
1. Measure with PageSpeed Insights / CrUX / RUM — record LCP, INP, CLS.
2. Run `python skills/core-web-vitals/scripts/cwv_audit.py <url>` when network is available (PSI API).
3. Prioritize fixes per metric (image/TTFB for LCP; long tasks for INP; dimensions for CLS).
4. Require `width`/`height` (or aspect-ratio reserved space) on content images.
5. Re-measure after changes; keep lab vs field distinction clear.
6. Use `references/cwv-checklist.md`.
## Common Rationalizations
| Rationalization | Reality |
|---|---|
| "I can estimate LCP without tools." | Measure with PSI/CrUX/RUM — never invent scores. |
| "Lab scores are what Google uses." | Field data is the ranking-relevant signal when available; lab guides debugging. |
| "CLS fixes can wait." | Unsized media causes layout shift — set dimensions when shipping images. |
## Red Flags
- Inventing ranking factors not documented by Google
- Skipping verification ("looks fine")
- Advising spammy shortcuts (cloaking, doorways, link schemes)
## Verification
- [ ] Numeric evidence before and after (or explicit tool error documented)
- [ ] Fixes mapped to the failing metric
- [ ] No fake scores assertedMore Performance skills
seo-audit
coreyhaines31/marketingskills
When the user wants to audit, review, or diagnose SEO issues on their site. Also use when the user mentions "SEO audit," "technical SEO," "why am I not ranking," "SEO issues," "on-page SEO," "meta tags review," "SEO health check," "my traffic dropped," "lost rankings," "not showing up in Google," "site isn't ranking," "Google update hit me," "page speed," "core web vitals," "crawl errors," or "indexing issues." Use this even if the user just says something vague like "my SEO is bad" or "help with SEO" — start with an audit. For building pages at scale to target keywords, see programmatic-seo. For adding structured data, see schema. For AI search optimization, see ai-seo.
competitor-profiling
coreyhaines31/marketingskills
When the user wants to research, profile, or analyze competitors from their URLs. Also use when the user mentions 'competitor profile,' 'competitor research,' 'competitor analysis,' 'profile this competitor,' 'analyze competitor,' 'competitive intelligence,' 'competitor deep dive,' 'who are my competitors,' 'competitor landscape,' 'competitor dossier,' 'competitive audit,' or 'research these competitors.' Input is a list of competitor URLs. Output is structured competitor profile markdown files. For creating comparison/alternative pages from profiles, see competitors. For sales-specific battle cards, see sales-enablement.
prospecting
coreyhaines31/marketingskills
When the user wants to find, qualify, and build a list of prospects to reach out to — across B2B SaaS, general B2B, or local small businesses. Also use when the user mentions "prospecting," "build a prospect list," "find prospects," "find leads," "lead gen list," "find SaaS companies that," "find B2B companies," "find local businesses," "ICP-fit accounts," "who should we go after," "outbound list," "target account list," "find clients near me," "businesses without websites," "prospect research," "qualified leads," "find my first customers," "early adopters," "design partners," "beta users," or "who has this problem." Use this for the list-building and qualification phase. For writing the outbound copy after the list is built, see cold-email. For deep competitive research on specific accounts, see competitor-profiling.
