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Agent skill

Tailwind V4

by mastra-ai in mastra-ai/mastra

Tailwind CSS v4 usage guide and v3-to-v4 differences. An agent skill from mastra-ai/mastra.

Custom licenceAuto-check passedFrontend & Design

Install Tailwind V4

skills CLI
$ npx skills add mastra-ai/mastra --skill tailwind-v4 -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mastra-ai/mastra tailwind-v4 --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mastra-ai/mastra.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/tailwind-v4 .claude/skills/tailwind-v4 && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
tailwind-v4
GitHub stars
29k
Token cost
~2.5k tokens
SKILL.md length
753 words
Files
1
Skills in repo
44
Repo updated
First seen
Licence
Custom licence

At a glance

Tailwind CSS v4 usage guide and v3-to-v4 differences. An agent skill from mastra-ai/mastra.

  • Tasks involving Tailwind classes
  • SKILL.md covers Version and sources, CSS-first configuration, v3 → v4 renames and Prefer generated utilities…, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • CSS-first configuration

What it does

Tailwind V4 is an agent skill from mastra-ai/mastra. Tailwind CSS v4 usage guide and v3-to-v4 differences. This skill should be used when writing, reviewing, or refactoring any Tailwind CSS code in this repo. Triggers on tasks involving Tailwind classes, @theme blocks, CSS-first configuration, or cleanup of v3-era syntax.

Its SKILL.md is about 2.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering CSS and styling and Refactoring. It works with Tailwind CSS. The repository describes itself as: Mastra is the modern TypeScript framework for AI-powered applications and agents.

When your agent uses it

  • Tasks involving Tailwind classes
  • CSS-first configuration
  • Cleanup of v3-era syntax

Example prompts

  • “/tailwind-v4”

What it can do on your machine

Read from SKILL.md and the folder at commit b98829a. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • tailwindcss.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Tailwind V4 loads about 2.5k tokens when it runs. Until then it costs about 71 tokens; SKILL.md has 753 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~71
When it runs · the whole SKILL.md, loaded when a task matches
~2.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 753 words (~2,546 tokens).

“How to write idiomatic Tailwind v4 and spot v3-era syntax that still compiles but should not appear in new code.”

— opening of SKILL.md by mastra-ai, Custom licence
name
tailwind-v4

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/tailwind-v4 of mastra-ai/mastra.

Open the folder on GitHubat commit b98829a

Compare with similar skills

Tailwind V4 next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Tailwind V4 compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Tailwind V4 this skillmastra-ai/mastra29k—~2.5kAutomated safety check: PassCustom licence
Unslop UIJCarterJohnson/vibecoded-design-tells513—~1.9kAutomated safety check: PassCustom licence
Frontend Code Stylemailtrap/mailtrap-local109—~2.7kAutomated safety check: PassMIT
Frontend UI FunctionalvictorGPT/vibeusage130—~939Automated safety check: PassMIT
Frontend UI Foundryjiushiwon/wg-skills114—~1.4kAutomated safety check: PassApache-2.0
Bulletproof Frontendaaddrick/claude-pipeline130—~1kAutomated safety check: PassMIT

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    mailtrap/mailtrap-local

    A skill your agent uses when writing or refactoring React + Tailwind v4 code in this repo.

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Works with

Categories

Questions about Tailwind V4

What does Tailwind V4 do?

Tailwind CSS v4 usage guide and v3-to-v4 differences. An agent skill from mastra-ai/mastra. Tailwind V4 is an agent skill from mastra-ai/mastra. Tailwind CSS v4 usage guide and v3-to-v4 differences.

When should I use Tailwind V4?

Tailwind V4 fits situations like: tasks involving Tailwind classes; CSS-first configuration; cleanup of v3-era syntax.

How do I install Tailwind V4 in Claude Code?

Run `npx skills add mastra-ai/mastra --skill tailwind-v4 -a claude-code`. Or copy the skill folder (.claude/skills/tailwind-v4 in mastra-ai/mastra) into .claude/skills/tailwind-v4 in your project. Claude Code loads it when a task matches its description.

How do I install Tailwind V4 in Codex?

Run `npx skills add mastra-ai/mastra --skill tailwind-v4 -a codex`. Or copy the skill folder (.claude/skills/tailwind-v4 in mastra-ai/mastra) into .agents/skills/tailwind-v4 in your project. Codex loads it when a task matches its description.

Can I use Tailwind V4 in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mastra-ai/mastra --skill tailwind-v4 -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tailwind-v4, .gemini/skills/tailwind-v4, .github/skills/tailwind-v4 and .opencode/skills/tailwind-v4 in your project.

What does Tailwind V4 need to run?

SKILL.md names no scripts, command-line tools or credentials: Tailwind V4 is instructions for the agent only.

Does Tailwind V4 access the network?

SKILL.md names 1 domain. As links in the text: tailwindcss.com. This is read from the text; nothing was executed.

Is Tailwind V4 safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Tailwind V4 use?

Tailwind V4 has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Tailwind V4 use?

About 2.5k tokens (SKILL.md is roughly 10k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Tailwind V4?

Skills that share tags, products or a category with Tailwind V4: Unslop UI (JCarterJohnson/vibecoded-design-tells, 513 stars), Frontend Code Style (mailtrap/mailtrap-local, 109 stars), Frontend UI Functional (victorGPT/vibeusage, 130 stars) and Frontend UI Foundry (jiushiwon/wg-skills, 114 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Tailwind V4?

mastra-ai (a GitHub organization) maintains it in mastra-ai/mastra, which has 28,698 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on October 11, 2026.

Source: mastra-ai/mastra on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.