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 johnrogers/claude-swift-engineering --skill ios-higgit clone --depth 1 https://github.com/johnrogers/claude-swift-engineeringWrote 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/johnrogers/claude-swift-engineering/ios-hig)<a href="https://agentmods.dev/skills/johnrogers/claude-swift-engineering/ios-hig"><img src="https://agentmods.dev/badge/skills/johnrogers/claude-swift-engineering/ios-hig/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/johnrogers/claude-swift-engineering/ios-hig"><img src="https://agentmods.dev/badge/skills/johnrogers/claude-swift-engineering/ios-hig.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 | $0.00049 | $0.00570 |
| Opus 5 | $0.00024 | $0.00285 |
| Sonnet 5 | $0.00010 | $0.00114 |
| Haiku 4.5 | $0.00005 | $0.00057 |
Grade A, and why
ios-hig 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 — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.
iOS Human Interface Guidelines
Apple's Human Interface Guidelines define the visual language, interaction patterns, and accessibility standards that make iOS apps feel native and intuitive. The core principle: clarity and consistency through thoughtful design.
Reference Loading Guide
ALWAYS load reference files if there is even a small chance the content may be required. It's better to have the context than to miss a pattern or make a mistake.
| Reference | Load When |
|---|---|
| Interaction | Touch targets, navigation, layout, hierarchy, or gesture patterns |
| Content | Empty states, writing copy, typography, or placeholder text |
| Visual Design | Colors, materials, contrast, dark mode, or SF Symbols |
| Accessibility | VoiceOver, Dynamic Type, Reduce Motion, or accessibility labels |
| Feedback | Animations, haptics, loading states, or error messages |
| Performance | Responsiveness, system components, or app launch |
| Privacy | Permission requests, data handling, or privacy-sensitive APIs |
Common Mistakes
-
Touch targets smaller than 44x44 points — Buttons and interactive elements must be at least 44x44 points (iOS) to accommodate thumbs. Smaller targets cause frustrated users and accessibility failures.
-
Ignoring Dynamic Type constraints — Text with fixed sizes doesn't respect user accessibility settings. Use Dynamic Type sizes, test with Large or Extra Large settings, and avoid hardcoded font sizes.
-
Insufficient color contrast in dark mode — Colors that work in light mode may fail accessibility in dark mode. Test with Reduce Contrast accessibility setting enabled for both modes.
-
Over-animating transitions — Animations that feel smooth at 60fps can trigger motion sickness in users with vestibular issues. Respect Reduce Motion settings and keep animations under 300ms.
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.
- 10d ago First seen · 37 lines · 49 tokens per session scan A 518374646e96
ios-hig is a skill published in the GitHub repository johnrogers/claude-swift-engineering (228 stars, last pushed 7mo ago), licensed MIT. It adds 49 tokens to every session and 570 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 2026-08-30.
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