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 aj-geddes/useful-ai-prompts --skill css-architecturegit clone --depth 1 https://github.com/aj-geddes/useful-ai-promptsWrote 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/aj-geddes/useful-ai-prompts/css-architecture)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/css-architecture"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/css-architecture/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/aj-geddes/useful-ai-prompts/css-architecture"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/css-architecture.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 | $0.00036 | $0.00561 |
| Opus 5 | $0.00018 | $0.00280 |
| Sonnet 5 | $0.00007 | $0.00112 |
| Haiku 4.5 | $0.00004 | $0.00056 |
Grade A, and why
css-architecture 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSS Architecture
Table of Contents
Overview
Build maintainable CSS systems using methodologies like BEM (Block Element Modifier), SMACSS, and CSS-in-JS patterns with proper organization and conventions.
When to Use
- Large-scale stylesheets
- Component-based styling
- Design system development
- Multiple team collaboration
- CSS scalability and reusability
Quick Start
Minimal working example:
/* Block - standalone component */
.button {
display: inline-block;
padding: 10px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: all 0.3s ease;
}
/* Element - component part */
.button__icon {
margin-right: 8px;
vertical-align: middle;
}
/* Modifier - variant */
.button--primary {
background-color: #007bff;
color: white;
}
.button--primary:hover {
background-color: #0056b3;
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| BEM (Block Element Modifier) Pattern | BEM (Block Element Modifier) Pattern |
| SMACSS (Scalable and Modular Architecture for CSS) | SMACSS (Scalable and Modular Architecture for CSS) |
| CSS-in-JS with Styled Components | CSS-in-JS with Styled Components |
| CSS Variables (Custom Properties) | CSS Variables (Custom Properties) |
| Utility-First CSS (Tailwind Pattern) | Utility-First CSS (Tailwind Pattern) |
Best Practices
✅ DO
- Follow established patterns and conventions
- Write clean, maintainable code
- Add appropriate documentation
- Test thoroughly before deploying
What ships with it
6 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.
- references/bem-block-element-modifier-pattern.md 1.2 KB
- references/css-in-js-with-styled-components.md 1.3 KB
- references/css-variables-custom-properties.md 1.6 KB
- references/smacss-scalable-and-modular-architecture-for-css.md 1.3 KB
- references/utility-first-css-tailwind-pattern.md 1.4 KB
- templates/component-template.tsx 318 B
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.
- 9d ago First seen · 89 lines · 36 tokens per session scan A 91fe44eb14a9
css-architecture is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (338 stars, last pushed 6mo ago), licensed MIT. It adds 36 tokens to every session and 561 once invoked, about $0.0002 per session on Opus 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 2026-09-03.
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