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 dayvisonassis/sdd-skills --skill design-systemgit clone --depth 1 https://github.com/dayvisonassis/sdd-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/dayvisonassis/sdd-skills/design-system)<a href="https://agentmods.dev/skills/dayvisonassis/sdd-skills/design-system"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/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/dayvisonassis/sdd-skills/design-system"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/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 | $0.00113 | $0.02817 |
| Opus 5.5 | $0.00045 | $0.01127 |
| Sonnet 5.5 | $0.00023 | $0.00563 |
| Haiku 4.5 | $0.00011 | $0.00282 |
Grade A, and why
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 18d 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 — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design System
One answer to "which design rules apply to this UI?", for every skill and person that asks.
The baseline guides; the project's doc binds. A rule is the project's only when the project wrote it down in a tracked document. Everything this skill bundles is guidance for UI that is being written — never a gate, and never a defect by itself.
References, loaded on demand, all of which travel with this skill:
references/material-3.md(the default baseline: color roles, type scale, shape, state, motion, layout),references/interface-rules.md(interaction and accessibility rules, each tagged[gate]or[review]),references/design-direction.md(the brand layer and interface writing, for what a system leaves free),references/measuring.md(auditing by measured value) andreferences/design-system-template.md(the shape of a project's own doc).Rationale — why this skill exists and what it took from where:
https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Skill_Design_System.md. That file is not part of an installed copy; everything needed to run is in this folder.
INPUT
mode—apply(default: UI is about to be written, or another skill dispatched this one),authororaudit.- The target: the files, surfaces or routes concerned (
apply,audit); nothing forauthor. - Auto-discovers:
GATES.md, the project's design-system doc, and the UI library from the project's manifest.
OUTPUT
- Always, first: the resolution line — which source binds and why. One of:
design system: <path>·design system: <path> (untracked — local to this machine)·baseline: Material 3 — the project declares no design system·library conventions: <library> — Material 3 does not apply. apply— the rules for the UI at hand, gated ones first, and the verification to run.author— the project's design-system doc, written from the template at a tracked path.audit— a findings report. No file is edited.
What ships with it
7 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.
- 18d ago First seen · 204 lines · 113 tokens per session scan A 4ba6752fc198
design-system is a skill published in the GitHub repository dayvisonassis/sdd-skills (3 stars, last pushed 16d ago), licensed MIT. It adds 113 tokens to every session and 2,817 once invoked, about $0.0005 per session on Opus 5.5. 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 2026-10-12.
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