How do I install the Vitals Fixer skill?

Run npx skillmds@latest add dvcrn/vitals-fixer in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Vitals Fixer safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: executes scripts, makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Vitals Fixer?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Vitals Fixer free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Vitals Fixer?

dvcrn (@dvcrn) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Vitals Fixer by dvcrn — Agent Skill

Name: Vitals Fixer
Rating: 4.5 (4 reviews)
Author: dvcrn

File contents

Core Web Vitals Fixer

Your Lighthouse scores are red. This tool tells you exactly why and how to fix it. LCP, FID, CLS. all the acronyms, all the solutions. No more guessing at performance problems.

One command. Zero config. Just works.

Quick Start

npx ai-core-vitals ./src

What It Does

Analyzes your code for Core Web Vitals issues
Identifies LCP bottlenecks like render-blocking resources
Finds CLS causes like images without dimensions
Spots FID problems from heavy JavaScript execution
Provides specific code changes, not just generic advice

Usage Examples

# Full project analysis
npx ai-core-vitals ./

# Focus on specific metric
npx ai-core-vitals ./src --metric lcp

# Analyze with a URL for real data
npx ai-core-vitals ./src --url https://yoursite.com

# Prioritized fix list
npx ai-core-vitals ./src --prioritize

# Output detailed report
npx ai-core-vitals ./src -o vitals-report.md

Best Practices

Fix LCP first - It's the biggest impact on perceived performance
Measure before and after - Run Lighthouse to validate your fixes
Don't trust dev mode - Production builds behave differently. Test both
Focus on the biggest wins - One large image fix beats ten micro-optimizations

When to Use This

Failed a Core Web Vitals assessment on Search Console
Preparing for a Lighthouse audit
Client complains the site feels slow
Building performance regression tests

Part of the LXGIC Dev Toolkit

This is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.

Find more:

GitHub: https://github.com/LXGIC-Studios
Twitter: https://x.com/lxgicstudios
Substack: https://lxgicstudios.substack.com
Website: https://lxgic.dev

Requirements

No install needed. Just run with npx. Node.js 18+ recommended.

npx ai-core-vitals --help

How It Works

The tool scans your source files for patterns known to hurt Web Vitals. It identifies specific issues like unoptimized images, missing preloads, layout-shifting elements, and heavy bundle imports. AI correlates these findings with your actual code to suggest targeted fixes.

License

MIT. Free forever. Use it however you want.

---name: vitals-fixerdescription: Fix Core Web Vitals issues with AI guidance. Use when your Lighthouse scores need improvement.---# Core Web Vitals FixerYour Lighthouse scores are red. This tool tells you exactly why and how to fix it. LCP, FID, CLS. all the acronyms, all the solutions. No more guessing at performance problems.**One command. Zero config. Just works.**## Quick Start```bashnpx ai-core-vitals ./src```## What It Does- Analyzes your code for Core Web Vitals issues- Identifies LCP bottlenecks like render-blocking resources- Finds CLS causes like images without dimensions- Spots FID problems from heavy JavaScript execution- Provides specific code changes, not just generic advice## Usage Examples```bash# Full project analysisnpx ai-core-vitals ./# Focus on specific metricnpx ai-core-vitals ./src --metric lcp# Analyze with a URL for real datanpx ai-core-vitals ./src --url https://yoursite.com# Prioritized fix listnpx ai-core-vitals ./src --prioritize# Output detailed reportnpx ai-core-vitals ./src -o vitals-report.md```## Best Practices- **Fix LCP first** - It's the biggest impact on perceived performance- **Measure before and after** - Run Lighthouse to validate your fixes- **Don't trust dev mode** - Production builds behave differently. Test both- **Focus on the biggest wins** - One large image fix beats ten micro-optimizations## When to Use This- Failed a Core Web Vitals assessment on Search Console- Preparing for a Lighthouse audit- Client complains the site feels slow- Building performance regression tests## Part of the LXGIC Dev ToolkitThis is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.**Find more:**- GitHub: https://github.com/LXGIC-Studios- Twitter: https://x.com/lxgicstudios- Substack: https://lxgicstudios.substack.com- Website: https://lxgic.dev## RequirementsNo install needed. Just run with npx. Node.js 18+ recommended.```bashnpx ai-core-vitals --help```## How It WorksThe tool scans your source files for patterns known to hurt Web Vitals. It identifies specific issues like unoptimized images, missing preloads, layout-shifting elements, and heavy bundle imports. AI correlates these findings with your actual code to suggest targeted fixes.## LicenseMIT. Free forever. Use it however you want.

Frequently asked questions

Vitals Fixer