A guide to Tailwind CSS v4, a CSS framework that styles interfaces with small utility classes and a CSS-based configuration.

Use it when configuring Tailwind, migrating to v4, defining themes and design tokens, building responsive layouts, or optimizing CSS output.

It helps keep generated CSS smaller and builds faster while using Tailwind v4's current configuration and responsive styling patterns.

tailwind — Skill for Claude Code and Codex by PyModel

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.

Any agent

npx skills add PyModel/react-frontend-skills --skill tailwind

Clone the repo

git clone --depth 1 https://github.com/PyModel/react-frontend-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/pymodel/react-frontend-skills/tailwind/github.svg)](https://agentmods.dev/skills/pymodel/react-frontend-skills/tailwind)

Your own site

<a href="https://agentmods.dev/skills/pymodel/react-frontend-skills/tailwind"><img src="https://agentmods.dev/badge/skills/pymodel/react-frontend-skills/tailwind/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/pymodel/react-frontend-skills/tailwind"><img src="https://agentmods.dev/badge/skills/pymodel/react-frontend-skills/tailwind.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,497 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 86% copy Near-identical to another mod 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 5.1	$0.00012	$0.01497
Opus 5.5	$0.00005	$0.00599
Sonnet 5.5	$0.00002	$0.00299
Haiku 4.5	$0.00001	$0.00150

Measured 20d ago against content hash 7c772585f930, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tailwind scanned grade A with 0 findings 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 20d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

86% identical to tailwind — 33 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/tailwind/SKILL.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tailwind Labs Tailwind CSS v4 Best Practices

Comprehensive performance optimization guide for Tailwind CSS v4 applications, maintained by Tailwind Labs. Contains 42 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

Configuring Tailwind CSS v4 build tooling (Vite plugin, PostCSS, CLI)
Writing or migrating styles using v4's CSS-first approach
Optimizing CSS bundle size and build performance
Implementing responsive designs with breakpoints or container queries
Setting up theming with @theme directive and design tokens

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Build Configuration	CRITICAL	`build-`
2	CSS Generation	CRITICAL	`gen-`
3	Bundle Optimization	HIGH	`bundle-`
4	Utility Patterns	HIGH	`util-`
5	Component Architecture	MEDIUM-HIGH	`comp-`
6	Theming & Design Tokens	MEDIUM	`theme-`
7	Responsive & Adaptive	MEDIUM	`resp-`
8	Animation & Transitions	LOW-MEDIUM	`anim-`

Quick Reference

1. Build Configuration (CRITICAL)

build-vite-plugin - Use Vite Plugin Over PostCSS
build-css-import - Use CSS Import Over @tailwind Directives
build-content-detection - Leverage Automatic Content Detection
build-node-version - Use Node.js 20+ for the upgrade tool
build-postcss-simplify - Remove Redundant PostCSS Plugins
build-cli-package - Use Correct CLI Package

2. CSS Generation (CRITICAL)

gen-css-first-config - Use CSS-First Configuration Over JavaScript
gen-avoid-theme-bloat - Avoid Excessive Theme Variables
gen-oklch-colors - Use OKLCH Color Space for Vivid Colors
gen-utility-directive - Use @utility for Custom Utilities
gen-dynamic-utilities - Use Dynamic Utility Values
gen-css-variable-syntax - Use Parentheses for CSS Variable References

Read the full file on GitHub · 110 lines

Files

What ships with it

42 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.

20d ago Changed · -3 lines · -78 tokens per session 7c772585f930
1mo ago First seen · 113 lines · 90 tokens per session scan A 5740b0028251

Subscribe to this mod's changes

tailwind is a skill published in the GitHub repository PyModel/react-frontend-skills (37 stars, last pushed 3d ago), licensed MIT. It adds 12 tokens to every session and 1,497 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 86% identical to tailwind, differing in 33 lines, and is treated as a copy.

CSS and styling Claude Code Frontend agent-skills ai-agents ai-coding-assistant codex cursor

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tailwind