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 markdavidgan/apple-dev-skills --skill apple-design-languagegit clone --depth 1 https://github.com/markdavidgan/apple-dev-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/markdavidgan/apple-dev-skills/apple-design-language)<a href="https://agentmods.dev/skills/markdavidgan/apple-dev-skills/apple-design-language"><img src="https://agentmods.dev/badge/skills/markdavidgan/apple-dev-skills/apple-design-language.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.01529 |
| Opus 5 | $0.00000 | $0.00764 |
| Sonnet 5 | $0.00000 | $0.00306 |
| Haiku 4.5 | $0.00000 | $0.00153 |
Grade A, and why
apple-design-language 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 8d 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 — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Apple Design Language
The editorial layer for Apple apps on iOS, iPadOS, and macOS: the parts of "feels Apple-quality" that aren't a spacing number — copy, interaction states, empty/error states, and the judgment of when to follow versus tastefully break the Human Interface Guidelines. Think in capabilities (touch vs. pointer, compact vs. regular vs. window), not device names.
This skill is the entry point to the design language. It owns four things and routes everything else.
Orientation index
| Concern | Where it lives |
|---|---|
| Spacing, optical alignment, padding, corner concentricity, hairlines, depth | swiftui-micro-craft |
| Motion timing, named springs, gestures, haptics | swiftui-micro-craft |
| Type scale mechanics, SF Symbol sizing/weight, Dynamic Type plumbing | swiftui-micro-craft |
| Color, design tokens, Liquid Glass, system materials | apple-design |
| VoiceOver, Dynamic Type coverage, tap-target sizing | ios-accessibility |
| Adaptive layout, size classes, multi-platform navigation | cross-platform-adaptivity |
| UX writing & copy | this skill → references/ux-writing.md |
| Forms, validation, focus, loading, control states | this skill → references/interaction-states.md |
| Empty & error states | this skill → references/empty-error-states.md |
| When to follow vs. break HIG; quality-vs-slop judgment | this skill (below) |
| Worked examples of tasteful HIG deviation | this skill → references/exemplars.md |
HIG is the floor, not the ceiling
The Human Interface Guidelines encode what is safe and approvable. Meet that floor everywhere. But Apple's own best apps — and most Apple Design Award winners — exceed or selectively break the defaults where it serves the user. "HIG-compliant" and "great" are not the same target. Your job: clear the floor without exception, then raise the ceiling deliberately.
Deviation decision gates
Deviate from a HIG default only when all four hold:
- Named benefit — you can state the user benefit in one sentence that isn't "looks better," "feels modern," or "cleaner."
- Survives the slop check — it is not one of the numbered tells below (and will pass
swiftui-design-checkonce that exists). - Survives assistive tech — still correct under VoiceOver and Dynamic Type at AX5 (see
ios-accessibility). - Systematic — applied as a rule across the app, not a one-off that creates an inconsistency.
What ships with it
4 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.
- 8d ago First seen · 89 lines · 0 tokens per session scan A 4b1effaa2bae
apple-design-language is a skill published in the GitHub repository markdavidgan/apple-dev-skills (5 stars, last pushed 9d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,529 tokens. 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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