/core-web-vitals
When the user wants to optimize Core Web Vitals, fix LCP, INP, or CLS issues. Also use when the user mentions "Core Web Vitals," "CWV," "LCP," "INP," "CLS," "FID," "page speed," "page performance," "Largest Contentful Paint," "Interaction to Next Paint," "Cumulative Layout
$ npx -y skills add kostja94/marketing-skills --skill core-web-vitals --agent claude-codeHow it fires
How this skill gets triggered: by you, by Claude, or both.
- Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.Read the full definition →
- You can call itInvoke it directly when you want it.
- Slash command
/core-web-vitals
Context preview
The summary Claude sees to decide when to auto-load this skill.
When the user wants to optimize Core Web Vitals, fix LCP, INP, or CLS issues. Also use when the user mentions "Core Web Vitals," "CWV," "LCP," "INP," "CLS," "FID," "page speed," "page performance," "Largest Contentful Paint," "Interaction to Next Paint," "Cumulative Layout
SKILL.md
core-web-vitals.SKILL.mdname: core-web-vitals
description: When the user wants to optimize Core Web Vitals, fix LCP, INP, or CLS issues. Also use when the user mentions "Core Web Vitals," "CWV," "LCP," "INP," "CLS," "FID," "page speed," "page performance," "Largest Contentful Paint," "Interaction to Next Paint," "Cumulative Layout Shift," or "Page Experience." For GSC CWV, use google-search-console.
metadata:
version: 1.0.2
SEO Technical: Core Web Vitals
Guides optimization of Core Web Vitals (CWV)—Google's user experience metrics that affect search ranking. CWV are confirmed ranking factors for mobile and desktop.
**When invoking**: On **first use**, if helpful, open with 1–2 sentences on what this skill covers and why it matters, then provide the main output. On **subsequent use** or when the user asks to skip, go directly to the main output.
Scope (Technical SEO)
- **LCP** (Largest Contentful Paint): Loading performance; time to render largest content element
- **INP** (Interaction to Next Paint): Responsiveness; replaced FID on March 12, 2024
- **CLS** (Cumulative Layout Shift): Visual stability; unexpected layout shifts
Target Thresholds (75th percentile, field data)
| Metric | Target | Good | Needs Improvement | Poor | |--------|--------|------|-------------------|------| | **LCP** | ≤2.5s | ≤2.5s | 2.5–4.0s | >4.0s | | **INP** | ≤200ms | ≤200ms | 200–500ms | >500ms | | **CLS** | <0.1 | ≤0.1 | 0.1–0.25 | >0.25 |
**Source**: [Google Page Experience](https://developers.google.com/search/docs/appearance/page-experience)
Initial Assessment
**Check for project context first:** If `.claude/project-context.md` or `.cursor/project-context.md` exists, read it for site URL.
Identify: 1. **Tools**: GSC Core Web Vitals report, PageSpeed Insights, Chrome DevTools 2. **Metrics**: Which metric is failing (LCP, INP, CLS) 3. **Page type**: Hero, article, product, list—LCP candidate differs
LCP Optimization
LCP measures the time until the largest content element (image, video, or text block) is visible.
| Cause | Fix | |-------|-----| | **Slow server response** | Reduce TTFB; use CDN; optimize server | | **Render-blocking resources** | Defer non-critical CSS/JS; inline critical CSS | | **Large images** | WebP/AVIF; compress; `width`/`height` to prevent CLS; see **image-optimization** | | **Client-side rendering** | SSR/SSG for above-fold content; see **rendering-strategies** | | **Third-party scripts** | Load async; defer non-critical |
**LCP candidates**: Hero image, large text block, video poster. Ensure above-fold images use `loading="eager"` (default); never lazy-load LCP.
INP Optimization
INP measures responsiveness—time from user interaction to next paint. Replaced FID on March 12, 2024.
| Cause | Fix | |-------|-----| | **Long-running JS** | Break tasks >50ms; use `requestIdleCallback`; Web Workers | | **Heavy event handlers** | Debounce/throttle; defer non-critical work | | **Main thread blocking** | Reduce third-party scripts; defer non-critical JS | | **Layout thrashing** | Batch DOM reads/writes; avoid forced reflows |
CLS Optimization
CLS measures unexpected layout shifts.
| Cause | Fix | |-------|-----| | **Images without dimensions** | Always set `width` and `height` attributes | | **Dynamic content** | Reserve space for ads, embeds; use `min-height` | | **Web fonts** | `font-display: optional` or `swap`; preload critical fonts | | **Animations** | Use `transform` instead of `top`/`left`/`width` |
**Reserve space**: For images, ads, embeds—define dimensions before load. Avoid inserting content above existing content without reserved space.
Tools & Monitoring
| Tool | Use | |------|-----| | **GSC** | Core Web Vitals report; URL grouping; field data | | **PageSpeed Insights** | Lab + field data; mobile + desktop | | **Chrome DevTools** | Performance panel; LCP element; layout shift overlay |
Output Format
- **Current state**: Which metrics fail (LCP, INP, CLS)
- **Prioritized fixes**: By impact
- **References**: [Web Vitals](https://web.dev/vitals/), [Page Experience](https://developers.google.com/search/docs/appearance/page-experience)
Related Skills
- **image-optimization**: LCP image optimization; WebP; lazy loading (below-fold only)
- **google-search-console**: CWV report; field data monitoring
- **mobile-friendly**: Mobile-first indexing; mobile CWV targets
- **rendering-strategies**: SSR/SSG for LCP; content in initial HTML
- **site-crawlability**: Redirect chains waste crawl; fix for performance
Read more
name: core-web-vitals description: When the user wants to optimize Core Web Vitals, fix LCP, INP, or CLS issues. Also use when the user mentions "Core Web Vitals," "CWV," "LCP," "INP," "CLS," "FID," "page speed," "page performance," "Largest Contentful Paint," "Interaction to Next Paint," "Cumulative Layout Shift," or "Page Experience." For GSC CWV, use google-search-console. metadata: version: 1.0.2
SEO Technical: Core Web Vitals
Guides optimization of Core Web Vitals (CWV)—Google's user experience metrics that affect search ranking. CWV are confirmed ranking factors for mobile and desktop.
**When invoking**: On **first use**, if helpful, open with 1–2 sentences on what this skill covers and why it matters, then provide the main output. On **subsequent use** or when the user asks to skip, go directly to the main output.
Scope (Technical SEO)
- **LCP** (Largest Contentful Paint): Loading performance; time to render largest content element
- **INP** (Interaction to Next Paint): Responsiveness; replaced FID on March 12, 2024
- **CLS** (Cumulative Layout Shift): Visual stability; unexpected layout shifts
Target Thresholds (75th percentile, field data)
| Metric | Target | Good | Needs Improvement | Poor | |--------|--------|------|-------------------|------| | **LCP** | ≤2.5s | ≤2.5s | 2.5–4.0s | >4.0s | | **INP** | ≤200ms | ≤200ms | 200–500ms | >500ms | | **CLS** | <0.1 | ≤0.1 | 0.1–0.25 | >0.25 |
**Source**: [Google Page Experience](https://developers.google.com/search/docs/appearance/page-experience)
Initial Assessment
**Check for project context first:** If `.claude/project-context.md` or `.cursor/project-context.md` exists, read it for site URL.
Identify: 1. **Tools**: GSC Core Web Vitals report, PageSpeed Insights, Chrome DevTools 2. **Metrics**: Which metric is failing (LCP, INP, CLS) 3. **Page type**: Hero, article, product, list—LCP candidate differs
LCP Optimization
LCP measures the time until the largest content element (image, video, or text block) is visible.
| Cause | Fix | |-------|-----| | **Slow server response** | Reduce TTFB; use CDN; optimize server | | **Render-blocking resources** | Defer non-critical CSS/JS; inline critical CSS | | **Large images** | WebP/AVIF; compress; `width`/`height` to prevent CLS; see **image-optimization** | | **Client-side rendering** | SSR/SSG for above-fold content; see **rendering-strategies** | | **Third-party scripts** | Load async; defer non-critical |
**LCP candidates**: Hero image, large text block, video poster. Ensure above-fold images use `loading="eager"` (default); never lazy-load LCP.
INP Optimization
INP measures responsiveness—time from user interaction to next paint. Replaced FID on March 12, 2024.
| Cause | Fix | |-------|-----| | **Long-running JS** | Break tasks >50ms; use `requestIdleCallback`; Web Workers | | **Heavy event handlers** | Debounce/throttle; defer non-critical work | | **Main thread blocking** | Reduce third-party scripts; defer non-critical JS | | **Layout thrashing** | Batch DOM reads/writes; avoid forced reflows |
CLS Optimization
CLS measures unexpected layout shifts.
| Cause | Fix | |-------|-----| | **Images without dimensions** | Always set `width` and `height` attributes | | **Dynamic content** | Reserve space for ads, embeds; use `min-height` | | **Web fonts** | `font-display: optional` or `swap`; preload critical fonts | | **Animations** | Use `transform` instead of `top`/`left`/`width` |
**Reserve space**: For images, ads, embeds—define dimensions before load. Avoid inserting content above existing content without reserved space.
Tools & Monitoring
| Tool | Use | |------|-----| | **GSC** | Core Web Vitals report; URL grouping; field data | | **PageSpeed Insights** | Lab + field data; mobile + desktop | | **Chrome DevTools** | Performance panel; LCP element; layout shift overlay |
Output Format
- **Current state**: Which metrics fail (LCP, INP, CLS)
- **Prioritized fixes**: By impact
- **References**: [Web Vitals](https://web.dev/vitals/), [Page Experience](https://developers.google.com/search/docs/appearance/page-experience)
Related Skills
- **image-optimization**: LCP image optimization; WebP; lazy loading (below-fold only)
- **google-search-console**: CWV report; field data monitoring
- **mobile-friendly**: Mobile-first indexing; mobile CWV targets
- **rendering-strategies**: SSR/SSG for LCP; content in initial HTML
- **site-crawlability**: Redirect chains waste crawl; fix for performance
Markdown skill library for AI agents - SEO, content, pages, paid ads, channels, strategies. Add project context + skills; your agent delivers tailored, production-ready output. Works with Cursor, Claude Code, OpenClaw, Lovable, and any AI that reads markdown.
Repo: kostja94/marketing-skills
Other skills on kostja94-marketing-skills.
- /google-search-console
When the user wants to analyze Google Search Console data, use the GSC API, or interpret search performance. Also use when the user mentions "GSC," "Search Console," "indexing report," "Core Web Vitals," "Enhancements," "Insights report," "search performance," "search queries,"
Open skill - /seo-monitoring
When the user wants to build an SEO data analysis system, monitor indexing/traffic/keywords/backlinks, or set up benchmarks. Also use when the user mentions "SEO data analysis," "SEO monitoring," "article database," "traffic benchmark," "penalty recovery," "SEO work document,"
Open skill - /ai-traffic
When the user wants to track AI search traffic in GA4 or GSC. Also use when the user mentions "AI traffic," "ChatGPT referral," "Perplexity traffic," "AI Overviews," "GA4 AI sources," "AI search analytics," "track AI referrals," "AI search traffic," "Claude traffic," or "how to
Open skill - /traffic
When the user wants to analyze website traffic sources, attribution, or dark traffic. Also use when the user mentions "traffic sources," "dark traffic," "direct traffic," "UTM parameters," "traffic attribution," "channel attribution," "attribution optimization," "channel
Open skill - /tracking
When the user wants to set up, audit, or optimize analytics tracking (GA4, events, conversions). Also use when the user mentions "Google Analytics," "GA4," "event tracking," "conversions," "attribution model," "gtag," "data layer," "GA4 setup," "conversion tracking," "event
Open skill - /community-forum
When the user wants to promote via forums, communities, or invite users to join a community. Also use when the user mentions "forum promotion," "Indie Hacker," "Hacker News," "community growth," "Discord promotion," "vertical community," "brand encyclopedia," "Wikipedia,"
Open skill