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CSS Minification Checker

Reviews stylesheets and build setup to confirm CSS is minified for production.

Source Download skill
Repository
thedaviddias/Front-End-Checklist
Stars
74,632
Licence
MIT
Files
2 files

What it does

Once installed, the agent reviews your stylesheets, component styles, and responsive behavior with a focus on whether CSS is minified before release. It explains why minification shrinks files by removing whitespace, comments, and verbose syntax, and suggests build-tool setups such as cssnano, Lightning CSS, or CleanCSS. It can also check rendered layouts across breakpoints and interaction states before proposing a fix.

Great for

  • Front-end developers setting up or auditing a build pipeline (Vite, webpack, PostCSS)
  • Teams reviewing page performance before a production release
  • Beginners who want a guided explanation of CSS minification

Skip it if

  • Projects that do not use a build step or serve hand-written CSS directly, since the advice assumes a bundler is available
  • Anyone expecting the skill to measure real page speed; it provides guidance and review, not benchmarks, and the typical 20-40% savings figure is a general claim, not a measurement of your files

Try asking

  • “Check whether my production CSS is minified and tell me how to enable it in Vite.”
  • “Set up cssnano in my PostCSS pipeline to minify all stylesheets.”
  • “Review my component styles and flag anything that would be missed by minification or breaks at mobile breakpoints.”
  • “Explain to my team why minifying CSS and enabling Gzip or Brotli improves load time.”
Step-by-step guide: how to use CSS Minification CheckerInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 2 original files, the MIT licence and an attribution note.

    css-minification.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip css-minification.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip css-minification.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Point the agent at your actual build config and built output so it can check what is really shipped, not just the theory.
  • Ask for a specific framework (for example Next.js or Vite) so the suggested configuration matches your project.
  • Review any proposed build-config changes yourself before committing, since the agent may suggest tools that do not match your setup.

What's inside

  • references/rule.md
  • SKILL.md

Redistributed unmodified from thedaviddias/Front-End-Checklist under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.