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Tailwind Theme Builder · jezweb | DecimalAI

frontendby jezweb

Tailwind Theme Builder

jezweb/tailwind-theme-builder

Source jezweb/claude-skills ↗License MIT

Set up Tailwind v4 + shadcn/ui themed UI with dark mode. Install deps, configure CSS variables via @theme inline, wire dark mode toggle, verify.

SkillScore86Maintained

Automatic

Frontend / UI pack

Last verified 8/14/2026

What it changes

Passed 16 of 19 test cases with the skill, and 13 of 19 without it.

Without skill68%

With skill86%

Checks it passed that the model alone missed

Maps variables using @theme inline.
Advises against using @apply inside @layer base.
Recommends tw-animate-css instead of tailwindcss-animate.

and 3 more in the full report

5 fixed14 passed either way2 still failing1 broke

Pass-rate lift: +18 pp
Tokens: +151%
Agent turns: 0%
Response time: -32%

Model gemini-3.6-flashMeasured 8/14/2026v119 of 22 cases passed with skill · 19 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jezweb-tailwind-theme-builder/SKILL.md https://app.decimal.ai/s/jezweb-tailwind-theme-builder/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jezweb-tailwind-theme-builder, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jezweb-tailwind-theme-builder/ and pins it in .decimal/skills.lock

decimalai skills add jezweb-tailwind-theme-builder

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jezweb-tailwind-theme-builder/SKILL.md https://app.decimal.ai/s/jezweb-tailwind-theme-builder/SKILL.md

Raw file: /s/jezweb-tailwind-theme-builder/SKILL.md ↗ · machine-readable summary at /s/jezweb-tailwind-theme-builder.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 5

Prompt

Our shadcn components require animation support in Tailwind CSS v4. Should we install `tailwindcss-animate`, or is there a different package recommended for v4 compatibility?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommends tw-animate-css instead of tailwindcss-animate.	Missed	Passed

case-09 · gemini-3.6-flash · 8/14/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md408 lines8 files

Tailwind Theme Builder

Set up a fully themed Tailwind v4 + shadcn/ui project with dark mode. Produces configured CSS, theme provider, and working component library.

Architecture: The Four-Step Pattern

Tailwind v4 requires a specific architecture for CSS variable-based theming. This pattern is mandatory -- skipping or modifying steps breaks the theme.

How It Works

CSS Variable Definition --> @theme inline Mapping --> Tailwind Utility Class
--background           --> --color-background     --> bg-background
(with hsl() wrapper)      (references variable)     (generated class)

Dark mode switching:

ThemeProvider toggles .dark class on <html>
  --> CSS variables update automatically (.dark overrides :root)
  --> Tailwind utilities reference updated variables
  --> UI updates without re-render

Best Practices

Semantic names: Use --primary not --blue-500
Foreground pairing: Every background colour needs a foreground (--primary + --primary-foreground)
WCAG contrast: Normal text 4.5:1, large text 3:1, UI components 3:1
Chart colours: Use separate variables with @theme inline mapping, reference via var(--chart-1) in style props

Workflow

Step 1: Install Dependencies

pnpm add tailwindcss @tailwindcss/vite
pnpm add -D @types/node tw-animate-css

Track record

Benchmark

16 / 19

test cases passed, vs 13 / 19 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jezweb / claude-skills

plugins/frontend/skills/tailwind-theme-builder/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 7 files

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

asymmetric-al/tailwind-v4-shadcnSet up Tailwind v4 with shadcn/ui using @theme inline pattern and CSS variable architecture. Four-step pattern: CSS variables, Tailwind mapping, base styles, automatic dark mode. Prevents 8 documented errors. Use when initializing React projects with Tailwind v4, or fixing colors not working, tw-animate-css errors, @theme inline dark mode conflicts, @apply breaking, v3 migration issues.Close match+23 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Tailwind Theme Builder

Architecture: The Four-Step Pattern

How It Works

Best Practices

Workflow

Step 1: Install Dependencies

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills