Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add roedyrustam/vibes-plug --skill performance-web-vitalsgit clone --depth 1 https://github.com/roedyrustam/vibes-plugWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/roedyrustam/vibes-plug/performance-web-vitals)<a href="https://agentmods.dev/skills/roedyrustam/vibes-plug/performance-web-vitals"><img src="https://agentmods.dev/badge/skills/roedyrustam/vibes-plug/performance-web-vitals/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/roedyrustam/vibes-plug/performance-web-vitals"><img src="https://agentmods.dev/badge/skills/roedyrustam/vibes-plug/performance-web-vitals.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.03243 |
| Opus 5.5 | $0.00032 | $0.01297 |
| Sonnet 5.5 | $0.00016 | $0.00649 |
| Haiku 4.5 | $0.00008 | $0.00324 |
Grade A, and why
performance-web-vitals scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 352 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web Performance & Core Web Vitals Expert
English
Orchestration & Integration
- Upstream Orchestrators: Works under
brainstormingandzero-to-prod-orchestrator(Phase 6 - Production Hardening & Web Performance) to achieve Lighthouse 95+ and green Core Web Vitals. - Downstream Cooperating Skills:
senior-frontend— Implement React 19useTransition, memoization, and component virtualization.modern-web-guidance— Apply CSS content-visibility, fetchpriority, and modern browser APIs.seo— Align Core Web Vitals (LCP, INP, CLS) with search indexing criteria.cloud-hosting-expert— Optimize edge caching, Brotli/Gzip compression, and CDN asset delivery.session-memory-manager— Store performance benchmark results and bundle budgets.
Description
Expert guide for measuring, diagnosing, and optimizing web application performance with a focus on Core Web Vitals (LCP, INP, CLS), JavaScript bundle optimization, image and font loading strategies, rendering performance, and achieving high Lighthouse scores. Covers Next.js 15, React 19, and modern browser APIs.
Trigger Conditions
- Improving Lighthouse performance score below 90.
- Diagnosing poor LCP, INP, or CLS metrics.
- Reducing JavaScript bundle size or eliminating render-blocking resources.
- Optimizing image loading, lazy loading, or font delivery.
- Implementing React performance patterns (memo, useDeferredValue, Suspense).
- Setting up Real User Monitoring (RUM) for Core Web Vitals.
- Optimizing server response times (TTFB).
Core Web Vitals Targets (2026 Standards)
| Metric | Good | Needs Improvement | Poor | Measures |
|---|---|---|---|---|
| LCP (Largest Contentful Paint) | ≤ 2.5s | 2.5–4.0s | > 4.0s | Loading performance |
| INP (Interaction to Next Paint) | ≤ 200ms | 200–500ms | > 500ms | Interactivity (replaced FID) |
| CLS (Cumulative Layout Shift) | ≤ 0.1 | 0.1–0.25 | > 0.25 | Visual stability |
| FCP (First Contentful Paint) | ≤ 1.8s | 1.8–3.0s | > 3.0s | Perceived loading |
| TTFB (Time to First Byte) | ≤ 800ms | 800–1800ms | > 1800ms | Server responsiveness |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago Changed · +11 lines · +79 tokens per session e4d2a4e0bbb5
- 7d ago Changed · +2 lines · -79 tokens per session 0da2b95440bc
- 10d ago Changed 41985a671723
- 19d ago Changed dbc3cff91f06
- 24d ago Changed 185c609e76a8
- 25d ago Changed 221742862545
- 27d ago Changed · -6 lines · +67 tokens per session 670d46182ac4
- 29d ago Changed · +6 lines · -67 tokens per session 84b69ceda60b
- 1mo ago Changed eef12ee20fcb
- 1mo ago First seen · 339 lines · 79 tokens per session scan A 2d98862f82e2
performance-web-vitals is a skill published in the GitHub repository roedyrustam/vibes-plug (115 stars, last pushed yesterday), licensed MIT. It adds 79 tokens to every session and 3,243 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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