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 schalkneethling/webdev-agent-skills --skill css-tokensgit clone --depth 1 https://github.com/schalkneethling/webdev-agent-skillsWrote 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/schalkneethling/webdev-agent-skills/css-tokens)<a href="https://agentmods.dev/skills/schalkneethling/webdev-agent-skills/css-tokens"><img src="https://agentmods.dev/badge/skills/schalkneethling/webdev-agent-skills/css-tokens.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00041 | $0.00969 |
| Opus 5 | $0.00020 | $0.00485 |
| Sonnet 5 | $0.00008 | $0.00194 |
| Haiku 4.5 | $0.00004 | $0.00097 |
Grade A, and why
css-tokens 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 7d 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 — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CSS Design Tokens Skill
Purpose
This skill provides a comprehensive set of CSS design tokens (custom properties) to establish a consistent design foundation for web projects. Use this skill when the user requests a base token system or design tokens for their CSS.
When to Use This Skill
Use this skill when the user asks for:
- "Add design tokens to my project"
- "Set up CSS tokens"
- "Create a tokens file"
- "Add base CSS variables"
- Similar requests for foundational CSS custom properties
When NOT to Use This Skill
- User already has an existing design token system (suggest modifications instead)
- User specifically requests a framework-specific token system (e.g., Tailwind config, CSS-in-JS tokens)
- User only needs a subset of tokens (offer to extract specific categories)
What This Skill Provides
A complete tokens.css file with a comprehensive design token system:
- Typography: Font families, weights, and a modular size scale (xs to 4xl)
- Spacing: Consistent size scale from 4px to 96px, named by pixel value
- Colors: Using
oklch()color space for perceptually uniform colors with light/dark mode variants for surfaces, text, brand, interactive elements, and semantic states - Borders: Radius values derived from the size scale (sm to full)
- Z-index: Named layers for stacking context (dropdown, modal, toast, etc.)
- Transitions: Standard timing values (fast, base, slow)
Users can reference individual tokens using CSS custom property syntax: var(--token-name)
Token Content
The complete token definitions are located in references/tokens.css within this skill directory. This file contains all the CSS custom property declarations organized by category.
How to Use This Skill
1. Detect CSS Directory
Search the project for common CSS directory names:
css/styles/assets/css/stylesheets/src/css/src/styles/
Check directories at multiple levels (root, src/, public/, assets/).
What ships with it
2 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.
- 7d ago First seen · 126 lines · 41 tokens per session scan A dfbf3f728328
css-tokens is a skill published in the GitHub repository schalkneethling/webdev-agent-skills (7 stars, last pushed 4mo ago), licensed MIT. It adds 41 tokens to every session and 969 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 2026-08-31.
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