How do I install the Critical skill?

Run npx skillmds@latest add javimosch/critical 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 Critical safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Critical?

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 Critical free to use?

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

Who published Critical?

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

Critical

Name: Critical
Author: javimosch

Use this skill when the user wants to extract critical CSS for above-the-fold content to improve page load performance.

javimosch c689fff 619 B Updated Sep 17, 2026

Web & Frontend

Install

Press C to copy

$ npx skillmds@latest add javimosch/critical

Installs into ~/.claude/skills (or .claude/skills inside a project). Restart Claude Code to pick it up.

Download SKILL.md

＋ Add to collection

README badge

[![SkillMD](https://skillmd.com/badge/javimosch/critical.svg)](https://skillmd.com/skills/javimosch/critical)

Trust & safety

3 of 3 audits passed

Last audited Sep 18, 2026 · commit c689fff

Works with: Claude Code Claude.ai OpenAI Codex +

File contents

critical Plugin

critical extracts and inlines critical CSS.

Usage Examples

"extract critical CSS from a webpage"
"inline critical CSS for performance"
"generate critical CSS for mobile and desktop"

Installation

npm install -g critical

Key Features

Above-the-fold CSS extraction
Critical CSS inlining
Responsive viewport support
HTML/CSS optimization
Page load performance improvement
Multiple page batch processing

javimosch/supercli/tree/main/plugins/critical/skills/quickstart commit c689fffeae

Frequently asked questions

npx skillmds@latest add javimosch/critical