Expert guidance for leveraging Tailwind CSS V4's new Oxide engine, CSS-first configuration, and modern styling paradigms. This skill transforms Claude into a Tailwind V4 architecture specialist, capable of designing component systems, optimizing performance, and executing complex styling challenges with precision.
SkillScore96Maintained
Automatic
◆Frontend / UI pack
Last verified 9/4/2026
What it changes
Passed 22 of 23 test cases with the skill, and 18 of 23 without it.
Without skill78%
With skill96%
Checks it passed that the model alone missed
Uses .outline-hidden in button variant classes.
Explains that v4 changed default border color to #e5e7eb.
Specifies checking browser compatibility during the audit step.
and 1 more in the full report
4 fixed18 passed either way1 still failing0 broke
Pass-rate lift
+17 pp
Tokens
+117%
Agent turns
0%
Response time
-13%
Model gemini-3.6-flashMeasured 9/4/2026v122 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 4
Prompt
After migrating to Tailwind CSS v4, our input borders changed from inheriting the element's current text color to displaying a default light gray line. Why did this happen and which utility class restores inherited text color for borders?
What was checked, without and with the skill
Checked
Without skill
With skill
Explains that v4 changed default border color to #e5e7eb.
Missed
Passed
Recommends .border-current to inherit text color.
Passed
Passed
case-13 · gemini-3.6-flash · 9/4/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md352 lines2 filesincludes scripts
Tailwind CSS V4 Mastery Skill
Philosophy: CSS-First Thinking
Tailwind V4 represents a philosophical shift from JavaScript-centric utility frameworks to CSS-native, declarative styling. This skill installs that mental model:
Configuration is CSS — @theme {} replaces tailwind.config.js
Speed is Architectural — Oxide engine (Rust) replaces JavaScript parser
Modern Standards First — Leverages @property, color-mix(), CSS nesting
Performance as a First-Class Citizen — 10-100x faster than v3
The correct mental model for V4: "CSS is the source of truth. JavaScript configuration is outdated."
Run project commands with just. Check for justfile in project root, list available tasks, execute common operations like test, build, lint. Triggers on: run tests, build project, list tasks, check available commands, run script, project commands.