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.
npx skills add existential-birds/beagle --skill tailwind-v4git clone --depth 1 https://github.com/existential-birds/beagleWrote 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.
[](https://agentmods.dev/skills/existential-birds/beagle/tailwind-v4)<a href="https://agentmods.dev/skills/existential-birds/beagle/tailwind-v4"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/tailwind-v4/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.
<a href="https://agentmods.dev/skills/existential-birds/beagle/tailwind-v4"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/tailwind-v4.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00070 | $0.01837 |
| Opus 5.5 | $0.00028 | $0.00735 |
| Sonnet 5.5 | $0.00014 | $0.00367 |
| Haiku 4.5 | $0.00007 | $0.00184 |
Grade A, and why
tailwind-v4 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 1mo 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- tailwind-v4 — 86% identical, 8 lines differ
- tailwind-v4 — 86% identical, 8 lines differ
How it starts
The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tailwind CSS v4 Best Practices
Quick Reference
Vite Plugin Setup:
// vite.config.ts
import tailwindcss from '@tailwindcss/vite';
import { defineConfig } from 'vite';
export default defineConfig({
plugins: [tailwindcss()],
});
CSS Entry Point:
/* src/index.css */
@import 'tailwindcss';
@theme Inline Directive:
@theme inline {
--color-primary: oklch(60% 0.24 262);
--color-surface: oklch(98% 0.002 247);
}
Key Differences from v3
| Feature | v3 | v4 |
|---|---|---|
| Configuration | tailwind.config.js | @theme in CSS |
| Build Tool | PostCSS plugin | @tailwindcss/vite |
| Colors | rgb() / hsl() | oklch() (default) |
| Theme Extension | extend: {} in JS | CSS variables |
| Dark Mode | darkMode config option | CSS variants |
@theme Directive Modes
default (standard mode)
Generates CSS variables that can be referenced elsewhere:
@theme {
--color-brand: oklch(60% 0.24 262);
}
/* Generates: :root { --color-brand: oklch(...); } */
/* Usage: text-brand → color: var(--color-brand) */
Note: You can also use @theme default explicitly to mark theme values that can be overridden by non-default @theme declarations.
inline
Inlines values directly without CSS variables (better performance):
@theme inline {
--color-brand: oklch(60% 0.24 262);
}
/* Usage: text-brand → color: oklch(60% 0.24 262) */
reference
Inlines values as fallbacks without emitting CSS variables:
@theme reference {
--color-internal: oklch(50% 0.1 180);
}
/* No :root variable, but utilities use fallback */
/* Usage: bg-internal → background-color: var(--color-internal, oklch(50% 0.1 180)) */
OKLCH Color Format
OKLCH provides perceptually uniform colors with better consistency across hues:
oklch(L% C H)
- L (Lightness): 0% (black) to 100% (white)
- C (Chroma): 0 (gray) to ~0.4 (vibrant)
- H (Hue): 0-360 degrees (red → yellow → green → blue → magenta)
What ships with it
3 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.
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.
- 1mo ago First seen · 234 lines · 70 tokens per session scan A 3bb7eec610f1
tailwind-v4 is a skill published in the GitHub repository existential-birds/beagle (82 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 70 tokens to every session and 1,837 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-16.
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