core-web-vitals SKILL.md skillB
core-web-vitals from tech-leads-club/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tech-leads-club/agent-skills/core-web-vitals@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tech-leads-club/agent-skills
- Path
packages/skills-catalog/skills/(performance)/core-web-vitals/SKILL.md- Versions recorded
- 2
- Latest version
- v1.0, committed Feb 26, 2026
- First version recorded
- Feb 5, 2026
- Size
- 12,001 bytes
- Repository stars
- 7,124
- License
- a license file GitHub does not identify
Optimize Core Web Vitals (LCP, INP, CLS) for better page experience and search ranking. Use when asked to "improve Core Web Vitals", "fix LCP", "reduce CLS", "optimize INP", "page experience optimization", or "fix layout shifts". Focuses specifically on the three Core Web Vitals metrics. Do NOT use for general web performance (use perf-web-optimization), Lighthouse audits (use perf-lighthouse), or Astro-specific optimization (use perf-astro).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Core Web Vitals optimization Targeted optimization for the three Core Web Vitals metrics that affect Google Search ranking and user experience. ## The three metrics | Metric | Measures | Good | Needs work | Poor | | ------- | ---------------- | ------- | ------------- | ------- | | **LCP** | Loading | ≤ 2.5s | 2.5s – 4s | > 4s | | **INP** | Interactivity | ≤ 200ms | 200ms – 500ms | > 500ms | | **CLS** | Visual Stability | ≤ 0.1 | 0.1 – 0.25 | > 0.25 | Google measures at the **75th percentile** — 75% of page visits must meet "Good" thresholds. --- ## LCP: Largest Contentful Paint LCP measures when the largest visible content element renders. Usually this is: - Hero image or video - Large text block - Background image - `<svg>` element ### Common LCP issues **1. Slow server response (TTFB > 800ms)** ``` Fix: CDN, caching, optimized backend, edge rendering ``` **2. Render-blocking resources** ```html <!-- ❌ Blocks rendering --> <link rel="stylesheet" href="/all-styles.css" /> <!-- ✅ Critical CSS inlined, rest deferred --> <style> /* Critical above-fold CSS */ </style> …
Read the whole file at its exact version.
How to install
mdr add tech-leads-club/agent-skills/core-web-vitals@sha256:c2d043789e33bd25The line at the top of this page pins the label v1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_77yrr4fvrys45awb)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Feb 5, 2026 and Feb 26, 2026, about one every 21 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0 latest | 2026-02-26 | 8dca459 | 12,001 B | B | view · diff |
| v1.0 | 2026-02-05 | 905f8bb | 11,784 B | B | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12001 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
tech-leads-club/agent-skills · 7,124 stars · license a license file GitHub does not identify · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_77yrr4fvrys45awb GET https://markdownregistry.com/api/v1/resolve?ref=tech-leads-club/agent-skills/core-web-vitals GET https://markdownregistry.com/api/v1/blob/c2d043789e33bd25b76c3b3756deb2e124237de25b1e30944c2eb2e624f0927e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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