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Phy CSS Dead Code

Category: General  ·  Sub-category: orchestration-frameworks  ·  Last updated:
type:audit
Unused CSS detector and dead selector auditor. Scans your stylesheet files against all HTML, JSX, TSX, Vue, and template files to find selectors that are defined but never referenced anywhere in your codebase. Detects CSS framework (Tailwind, Bootstrap, CSS Modules, vanilla CSS, Sass/SCSS) and applies the right analysis strategy for each. Reports estimated byte savings per dead rule, finds !important overuse, duplicate selectors, and orphaned media-query blocks. Generates a safe-deletion plan with exact grep verification commands. Works with PostCSS, Sass, Less, and raw CSS. Zero external API — uses npx and grep only. Triggers on "unused CSS", "dead CSS", "CSS bloat", "remove unused styles", "CSS cleanup", "what CSS can I delete", "/css-dead-code".
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

CSS only grows. Every sprint adds new rules; almost none get removed. A feature gets deleted — the styles stay. A component gets renamed — the old class selectors stay. After a year, 30-40% of your stylesheet is dead weight: downloaded by every user, parsed by every browser, doing nothing.

What this skill does

Phy CSS Dead Code is a community-contributed Claude Code skill in the orchestration-frameworks sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/phy-css-dead-code/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Phy CSS Dead Code Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/phy-css-dead-code
curl -L https://claudskills.com/skills/phy-css-dead-code/SKILL.md \
  -o ~/.claude/skills/phy-css-dead-code/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/phy-css-dead-code/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/phy-css-dead-code/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\phy-css-dead-code\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Phy CSS Dead Code Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/phy-css-dead-code/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Phy CSS Dead Code skill do?
Unused CSS detector and dead selector auditor. Scans your stylesheet files against all HTML, JSX, TSX, Vue, and template files to find selectors that are defined but never referenced anywhere in your codebase. Detects CSS framework (Tailwind, Bootstrap, CSS Modules, vanilla CSS, Sass/SCSS) and applies the right analysis strategy for each. Reports estimated byte savings per dead rule, finds !important overuse, duplicate selectors, and orphaned media-query blocks. Generates a safe-deletion plan with exact grep verification commands. Works with PostCSS, Sass, Less, and raw CSS. Zero external API — uses npx and grep only. Triggers on "unused CSS", "dead CSS", "CSS bloat", "remove unused styles", "CSS cleanup", "what CSS can I delete", "/css-dead-code".
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Phy CSS Dead Code skill?
Use Phy CSS Dead Code when your Claude Code task falls under the General category — specifically in the orchestration frameworks area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Phy CSS Dead Code" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Phy CSS Dead Code skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Phy CSS Dead Code is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
LeoYeAI. (2026). Phy CSS Dead Code [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/phy-css-dead-code/
BibTeX
@misc{phy-css-dead-code-2026,
  author    = {LeoYeAI},
  title     = {Phy CSS Dead Code [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/phy-css-dead-code/}
}

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Security scan

Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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