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 cosmicstack-labs/mercury-agent-skills --skill component-design-systemsgit clone --depth 1 https://github.com/cosmicstack-labs/mercury-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/cosmicstack-labs/mercury-agent-skills/component-design-systems)<a href="https://agentmods.dev/skills/cosmicstack-labs/mercury-agent-skills/component-design-systems"><img src="https://agentmods.dev/badge/skills/cosmicstack-labs/mercury-agent-skills/component-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/cosmicstack-labs/mercury-agent-skills/component-design-systems"><img src="https://agentmods.dev/badge/skills/cosmicstack-labs/mercury-agent-skills/component-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 | $0.00022 | $0.00413 |
| Opus 5 | $0.00011 | $0.00206 |
| Sonnet 5 | $0.00004 | $0.00083 |
| Haiku 4.5 | $0.00002 | $0.00041 |
Grade A, and why
component-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 5d 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.
What it actually says
Component Design Systems
Patterns for building scalable, accessible, and maintainable component libraries.
Architecture
design-system/
├── tokens/ # Design tokens
│ ├── colors.json
│ ├── typography.json
│ └── spacing.json
├── primitives/ # Base components
│ ├── Button/
│ ├── Input/
│ └── Text/
├── patterns/ # Composed patterns
│ ├── FormField/
│ ├── DataTable/
│ └── Modal/
└── docs/ # Documentation
└── Storybook/
Component API Design
// Compound component pattern
<Select>
<Select.Label>Country</Select.Label>
<Select.Trigger>
<Select.Value placeholder="Select a country" />
</Select.Trigger>
<Select.Content>
<Select.Item value="us">United States</Select.Item>
<Select.Item value="uk">United Kingdom</Select.Item>
</Select.Content>
</Select>
Common Mistakes
- No design tokens: Hardcoded values everywhere. Use tokens for colors, spacing, typography.
- Missing accessibility: Always include ARIA labels, keyboard nav, focus management.
- Too opinionated: Components should work out-of-box but be customizable via props/composition.
- No versioning strategy: Use semver. Document breaking changes clearly.
- No visual regression tests: Use Chromatic/Percy to catch unintended style 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.
- 5d ago First seen · 60 lines · 22 tokens per session scan A 393e19c52806
component-design-systems is a skill published in the GitHub repository cosmicstack-labs/mercury-agent-skills (471 stars, last pushed 14d ago), licensed MIT. It adds 22 tokens to every session and 413 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 2026-09-03.
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