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 blencorp/skills --skill nci-design-systemgit clone --depth 1 https://github.com/blencorp/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/blencorp/skills/nci-design-system)<a href="https://agentmods.dev/skills/blencorp/skills/nci-design-system"><img src="https://agentmods.dev/badge/skills/blencorp/skills/nci-design-system/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/blencorp/skills/nci-design-system"><img src="https://agentmods.dev/badge/skills/blencorp/skills/nci-design-system.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00064 | $0.00481 |
| Opus 5 | $0.00032 | $0.00241 |
| Sonnet 5 | $0.00013 | $0.00096 |
| Haiku 4.5 | $0.00006 | $0.00048 |
Grade A, and why
nci-design-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 10d 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 — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.
NCI Design System
Build within the system's documented scope and delivery model.
Before editing
- Confirm the product owner and that this system is authorized for the target surface.
- Read references/implementation.md before installing or changing dependencies.
- Read references/sources.md when checking versions, provenance, license, or release state.
- Inspect the existing framework, package manager, asset pipeline, and accessibility tests. Preserve them unless the official integration requires a change.
Workflow
- Choose one documented delivery path; do not mix compiled, source, CDN, and framework-wrapper paths accidentally.
- Pin the dependency or downloaded asset version and keep upstream notices.
- Reuse official components, tokens, content guidance, and templates before adding custom UI.
- Extend through documented tokens, properties, slots, Sass settings, or composition. Do not edit vendored package files.
- Test semantic structure, keyboard operation, focus order and visibility, accessible names, error recovery, zoom/reflow, contrast, and target browsers.
- Report custom patterns, unsupported requirements, and upstream gaps explicitly.
Boundaries
- Scope: National Cancer Institute products. NCIDS is not a generic NIH or HHS design system.
- Release: current public release with authenticated package, CDN, and direct-download paths (see the sources ledger for the version snapshot).
- Delivery: GitHub Packages for Sass/JavaScript, pinned CDN bundles, or direct download.
- Do not invent component APIs, tokens, package names, or compliance claims.
- Do not import another jurisdiction's branding to fill a gap.
- A passing component example does not prove the completed service conforms to WCAG, Section 508, the ADA, or local policy.
References
- Implementation — packages, setup, and integration decisions
- Sources — authoritative URLs, snapshot versions, ownership, and license notes
What ships with it
3 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.
- 10d ago First seen · 39 lines · 64 tokens per session scan A a3adcd21475e
nci-design-system is a skill published in the GitHub repository blencorp/skills (5 stars, last pushed 22d ago), licensed Apache-2.0. It adds 64 tokens to every session and 481 once invoked, about $0.0003 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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