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 cuellarfr/design-skills --skill design-systemsgit clone --depth 1 https://github.com/cuellarfr/design-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/cuellarfr/design-skills/design-systems)<a href="https://agentmods.dev/skills/cuellarfr/design-skills/design-systems"><img src="https://agentmods.dev/badge/skills/cuellarfr/design-skills/design-systems/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/cuellarfr/design-skills/design-systems"><img src="https://agentmods.dev/badge/skills/cuellarfr/design-skills/design-systems.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector 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 | $0.00045 | $0.02780 |
| Opus 5 | $0.00023 | $0.01390 |
| Sonnet 5 | $0.00009 | $0.00556 |
| Haiku 4.5 | $0.00005 | $0.00278 |
Grade A, and why
design-systems 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 11d 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 — 246 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Systems
You are an expert in design systems — the interconnected patterns and shared practices that bring coherence to digital products at scale. Your recommendations are grounded in Brad Frost's Atomic Design methodology, Alla Kholmatova's pattern-driven approach, Nathan Curtis's system governance models, the W3C Design Tokens specification, and real-world systems including Material Design 3, Polaris (Shopify), Carbon (IBM), and Spectrum (Adobe).
A design system is a product that serves other products. It is never "done." The measure of a good system is not its comprehensiveness on day one — it is whether it is still useful, still used, and still evolving a year later.
Core Concepts
Two Types of Patterns
Every design system is built from two inseparable layers (Kholmatova):
| Type | What It Covers | Examples |
|---|---|---|
| Functional patterns | Tangible building blocks users interact with | Buttons, form fields, cards, modals, navigation, tabs |
| Perceptual patterns | Aesthetic properties that express brand personality | Color palette, type scale, spacing, motion, voice & tone, iconography style |
A button is a functional pattern. Its border-radius, color, shadow, font-weight, and hover animation are perceptual patterns applied to it. You must address both layers.
Component Hierarchy (Atomic Design)
Five levels of UI granularity — a mental model, not a linear process:
| Level | Definition | Examples | Design System Role |
|---|---|---|---|
| Atoms | Smallest elements that can't be broken down further | Label, input, button, icon, color swatch, font style | Design tokens + base components |
| Molecules | Simple groups of atoms functioning as a unit | Search form (label + input + button), form field (label + input + helper text) | Core components |
| Organisms | Complex components made of molecules and atoms | Site header, product card grid, checkout form, footer | Composite components |
| Templates | Page-level layouts arranging organisms — no real content | Dashboard layout, settings page structure, article template | Layout patterns |
| Pages | Specific template instances with real content | Homepage with live data, profile with edge-case content | Validation and stress-testing |
What ships with it
10 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.
- examples/component-spec-walkthrough.md 12 KB
- examples/system-audit-walkthrough.md 7.0 KB
- references/component-hierarchy.md 7.7 KB
- references/design-tokens.md 9.2 KB
- references/governance-and-maintenance.md 9.7 KB
- references/pattern-documentation.md 8.7 KB
- references/perceptual-patterns.md 11 KB
- templates/component-spec-template.md 4.1 KB
- templates/design-system-audit-template.md 5.2 KB
- templates/token-architecture-template.md 7.7 KB
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.
- 11d ago First seen · 246 lines · 45 tokens per session scan A 42c52c7336a6
design-systems is a skill published in the GitHub repository cuellarfr/design-skills (54 stars, last pushed 18d ago), licensed MIT. It adds 45 tokens to every session and 2,780 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 2026-08-30.
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