agentmods.dev

css-architecture

css-architecture is a skill for Claude Code, Codex from aj-geddes/useful-ai-prompts. It costs 36 tokens per session (561 once invoked), scanned A, original, MIT.

A guide to organizing CSS, the language that controls a web page's visual style, so styles remain understandable as a project grows. It covers BEM, SMACSS, and CSS-in-JS naming and organization patterns.

In plain words
What is it for?
Use it to structure large stylesheets, style reusable components, build design systems, and coordinate CSS across teams.
Why use it?
It reduces conflicting rules, duplicated styles, and difficult-to-change stylesheets. Clear conventions also make shared components easier for multiple developers to maintain.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 376repo +1 8mo ago A scan Socket: passSnyk: pass 36 tokens original MIT

Good fit Use it to structure large stylesheets, style reusable components, build design systems, and coordinate CSS across teams.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/aj-geddes/useful-ai-prompts/css-architecture
View source ↗ aj-geddes/useful-ai-prompts
Install

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.

Any agent
npx skills add aj-geddes/useful-ai-prompts --skill css-architecture
Clone the repo
git clone --depth 1 https://github.com/aj-geddes/useful-ai-prompts

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for css-architecture

README.md
[![agentmods](https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/css-architecture/github.svg)](https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/css-architecture)
Your own site
<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.

agentmods 80×15 button for css-architecture

Your own site · 80×15
<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>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 561 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • Socket pass 16 Sept 2026
  • Snyk pass 16 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00036 $0.00561
Opus 5.5 $0.00014 $0.00224
Sonnet 5.5 $0.00007 $0.00112
Haiku 4.5 $0.00004 $0.00056

Measured 2mo ago against content hash 91fe44eb14a9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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.

skills/css-architecture/SKILL.md · 89 lines

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

Read the full file on GitHub · 89 lines

Files

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.

Changes

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.

  1. 2mo ago First seen · 89 lines · 36 tokens per session scan A 91fe44eb14a9

Subscribe to this mod's changes

css-architecture is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (376 stars, last pushed 8mo ago), licensed MIT. It adds 36 tokens to every session and 561 once invoked, about $0.0001 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 2026-09-03.

CSS and stylingFrontend
Related

css-architecture compared with skills from other repositories

css-architecture next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
css-architectureaj-geddes/useful-ai-promptsSkill3768mo agoMITA36Claude Code, Codex
anti-slop-designsickn33/agentic-awesome-skillsSkill49kyesterdayMITA34Claude Code
chakra-ui-builderchakra-ui/chakra-uiSkill41kyesterdayMITA214Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codexSkill34k3d agoMITA52Codex
open-design-setupcompozy/compozySkill2.8kyesterdayMITA67Claude Code, Codex
edit-sitemicrosoft/power-platform-skillsSkill1.1kyesterdayMITA104Claude Code
frontend-visual-qadaymade/claude-code-skillsSkill1.5kyesterdayMITA125Claude Code, Codex