What is wp-css-system?

A plain-CSS design system for basic WordPress themes. It uses CSS variables for shared design values and BEM naming for classes, without frameworks, preprocessors, or a build step.

Use it when building or converting a basic WordPress theme with colors, spacing, fonts, and other shared styles. It is not for Tailwind projects.

It keeps design values and class names consistent across the demo and WordPress theme. It also avoids needing tools that compile or transform CSS.

wp-css-system — Skill for Claude Code by yojahny55

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 yojahny55/claude-wp-builder --skill wp-css-system

Clone the repo

git clone --depth 1 https://github.com/yojahny55/claude-wp-builder

Made for: Claude Code.

Or install claude-wp-builder, the plugin that ships this one along with the rest of its 15 skills, 30 commands, 15 agents.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/yojahny55/claude-wp-builder/wp-css-system.svg)](https://agentmods.dev/skills/yojahny55/claude-wp-builder/wp-css-system)

Your own site

<a href="https://agentmods.dev/skills/yojahny55/claude-wp-builder/wp-css-system"><img src="https://agentmods.dev/badge/skills/yojahny55/claude-wp-builder/wp-css-system.svg" alt="Measured on agentmods" height="20"></a>

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,818 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

NVIDIA SkillSpector pass 7 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.

Model	Per session	Once invoked
Fable 5.1	$0.00026	$0.04818
Opus 5	$0.00013	$0.02409
Sonnet 5	$0.00005	$0.00964
Haiku 4.5	$0.00003	$0.00482

Measured 2d ago against content hash c828e0c0877b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

wp-css-system 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 2d 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/wp-css-system/SKILL.md · 657 lines

How it starts

The opening of the file, as written. The whole thing — 657 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Applies to template=basic only. If the project's .claude/CLAUDE.md says Template: tailwind, stop and use the wp-tailwind-system skill instead. The two are mutually exclusive: this skill's BEM + :root custom-property system is the wrong output surface for a Tailwind theme.

CSS Design System Standards

This skill defines the CSS architecture for template=basic themes. The system uses CSS custom properties (variables), BEM naming, and no build tools -- plain CSS files served directly.

Principles

No frameworks on this template -- basic themes use no Bootstrap, Tailwind, Foundation, or any CSS framework. (A tailwind project is not covered by this skill at all — see the banner above.)
No preprocessors -- no Sass, Less, or PostCSS
No build step -- CSS files are authored and served as-is
All values use custom properties -- never hardcode colors, spacing, font sizes, or other design tokens directly in rules
BEM naming convention for all class names
Consistency between demo HTML and WordPress theme CSS -- the design system carries over from the demo to the theme unchanged
Layout is flex or grid -- position: absolute is only for a real superposition (see below)

Custom Property Reference

All design tokens are defined in :root at the top of the main stylesheet.

Colors

:root {
    /* Primary palette */
    --color-primary: #1a5632;
    --color-primary-light: #2d7a4a;
    --color-primary-dark: #0f3d22;

    /* Secondary palette */
    --color-secondary: #c9a84c;
    --color-secondary-light: #d4b96e;
    --color-secondary-dark: #a88a2e;

    /* Tertiary palette */
    --color-tertiary: #2c3e50;
    --color-tertiary-light: #3d5571;
    --color-tertiary-dark: #1a2530;

    /* Neutral scale (gray ramp) */
    --color-neutral-50: #fafafa;
    --color-neutral-100: #f5f5f5;
    --color-neutral-200: #e5e5e5;
    --color-neutral-300: #d4d4d4;
    --color-neutral-400: #a3a3a3;
    --color-neutral-500: #737373;
    --color-neutral-600: #525252;
    --color-neutral-700: #404040;
    --color-neutral-800: #262626;
    --color-neutral-900: #171717;

    /* Semantic colors */
    --color-text: var(--color-neutral-800);
    --color-text-light: var(--color-neutral-500);
    --color-text-inverse: #ffffff;
    --color-background: #ffffff;
    --color-background-alt: var(--color-neutral-50);
    --color-border: var(--color-neutral-200);
    --color-success: #16a34a;
    --color-error: #dc2626;
    --color-warning: #f59e0b;
}

Read the full file on GitHub · 657 lines

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.

2d ago Changed · +83 lines c828e0c0877b
8d ago First seen · 574 lines · 26 tokens per session scan A e7dfffceb13b

Subscribe to this mod's changes

wp-css-system is a skill published in the GitHub repository yojahny55/claude-wp-builder (6 stars, last pushed today), licensed MIT. It adds 26 tokens to every session and 4,818 once invoked, about $0.0001 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 2026-08-31.

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