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 design-system-creationgit 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/design-system-creation)<a href="https://agentmods.dev/skills/aj-geddes/useful-ai-prompts/design-system-creation"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/design-system-creation/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/design-system-creation"><img src="https://agentmods.dev/badge/skills/aj-geddes/useful-ai-prompts/design-system-creation.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 | $0.00030 | $0.00627 |
| Opus 5 | $0.00015 | $0.00313 |
| Sonnet 5 | $0.00006 | $0.00125 |
| Haiku 4.5 | $0.00003 | $0.00063 |
Grade A, and why
design-system-creation 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 — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design System Creation
Table of Contents
Overview
A design system is a structured set of components, guidelines, and principles that ensure consistency, accelerate development, and improve product quality.
When to Use
- Multiple product interfaces or teams
- Scaling design consistency
- Reducing redundant component development
- Improving design-to-dev handoff
- Creating shared language across teams
- Building reusable components
- Documenting design standards
Quick Start
Minimal working example:
Design System Structure:
Foundation Layer:
Typography:
- Typefaces (Roboto, Inter)
- Font sizes (scale: 12, 14, 16, 20, 28, 36, 48)
- Font weights (Regular, Medium, Bold)
- Line heights and letter spacing
Colors:
- Primary brand color (#2196F3)
- Secondary colors
- Neutral palette (grays)
- Semantic colors (success, error, warning)
- Dark mode variants
Spacing:
- Base unit: 4px
- Scale: 4, 8, 12, 16, 24, 32, 48, 64px
- Apply consistently across UI
Shadows & Elevation:
- Elevation 0 (flat)
- Elevation 1, 2, 4, 8, 16 (increasing depth)
- Used for modals, cards, overlays
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Design System Components | Design System Components |
| Component Documentation | Component Documentation |
| Design System Governance | Design System Governance |
| Design System Documentation | Design System Documentation |
Best Practices
✅ DO
- Start with essential components
- Document every component thoroughly
- Include code examples
- Test components across browsers
- Include accessibility guidance
- Version the design system
- Have clear governance
- Communicate updates proactively
- Gather feedback from users
- Maintain incrementally
What ships with it
5 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.
- 9d ago First seen · 104 lines · 30 tokens per session scan A 66cc42df3fcd
design-system-creation is a skill published in the GitHub repository aj-geddes/useful-ai-prompts (338 stars, last pushed 6mo ago), licensed MIT. It adds 30 tokens to every session and 627 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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