A set of rules for using Tailwind CSS version 4, a CSS toolkit built from small reusable styling classes. It covers theme values, class composition, layout, sizing, typography, and related styling work.

Use it when writing, reviewing, refactoring, debugging, or understanding Tailwind CSS v4 classes and theme configuration.

It keeps Tailwind styles consistent and makes clear when a custom CSS rule is appropriate instead of adding more utility classes.

tailwindcss — Skill by xobotyi

Install

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.

agentmods

npx agentmods add skills/xobotyi/cc-foundry/tailwindcss

Any agent

npx skills add xobotyi/cc-foundry --skill tailwindcss

Clone the repo

git clone --depth 1 https://github.com/xobotyi/cc-foundry

Made for: Claude Code, Codex.

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,132 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00070	$0.05132
Opus 5	$0.00035	$0.02566
Sonnet 5	$0.00014	$0.01026
Haiku 4.5	$0.00007	$0.00513

Measured 2d ago against content hash 9bc62af17e74, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

tailwindcss scanned grade B with 1 finding 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 2d 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

- Don't lecture — state what's wrong and how to fix it.

plugins/frontend/skills/tailwindcss/SKILL.md · 389 lines

How it starts

The opening of the file, as written. The whole thing — 389 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tailwind CSS v4

Utility classes are the default. Custom CSS is the escape hatch.

Skill(frontend:css)

Skip only for trivial class additions where no CSS reasoning is needed.

Tailwind CSS uses CSS-first configuration: design tokens live in @theme, custom utilities use @utility, and there is no JavaScript configuration file. Constrain yourself to the design system; break out only with intention.

References

Theme — [${CLAUDE_SKILL_DIR}/references/theme-configuration.md]: Theme tokens, @theme options, namespace mapping, color system
Class authoring — [${CLAUDE_SKILL_DIR}/references/class-authoring.md]: Class composition, variants, dark mode, breakpoints
Custom utilities — [${CLAUDE_SKILL_DIR}/references/custom-utilities-and-variants.md]: @utility, @custom-variant, directives, @source
Layout — [${CLAUDE_SKILL_DIR}/references/layout.md]: Display, position, flexbox, grid, alignment, order utilities
Sizing — [${CLAUDE_SKILL_DIR}/references/sizing-and-spacing.md]: Spacing scale, width/height, padding/margin, borders, box model
Typography — [${CLAUDE_SKILL_DIR}/references/typography.md]: Font properties, text spacing, styling, decoration, layout
Backgrounds — [${CLAUDE_SKILL_DIR}/references/backgrounds-and-effects.md]: Gradients, shadows, rings, opacity, SVG, filters
Transforms — [${CLAUDE_SKILL_DIR}/references/transforms-and-animations.md]: Transitions, animations, 2D/3D transforms, masks
Framework — [${CLAUDE_SKILL_DIR}/references/framework-integration.md]: Preflight, CSS Modules, class binding (React, Vue, Svelte)

Entry Point and Installation

Single import: @import "tailwindcss"; — provides preflight reset, theme variables, and all utilities. No @tailwind base/components/utilities (v3 syntax)
Vite: install @tailwindcss/vite plugin. PostCSS: install @tailwindcss/postcss. CLI: npx @tailwindcss/cli -i input.css -o output.css
No tailwind.config.js in v4 — all configuration lives in CSS via @theme
Remove postcss-import and autoprefixer — v4 handles both internally
Do not use Sass, Less, or Stylus with Tailwind v4 — Tailwind is the preprocessor (handles @import, nesting, variables, vendor prefixes)

Read the full file on GitHub · 389 lines

Files

What ships with it

10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

2d ago First seen · 389 lines · 70 tokens per session scan B 9bc62af17e74

Subscribe to this mod's changes

tailwindcss is a skill published in the GitHub repository xobotyi/cc-foundry (20 stars, last pushed 2d ago), licensed MIT. It adds 70 tokens to every session and 5,132 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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