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 swiftui-advancedgit 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/swiftui-advanced)<a href="https://agentmods.dev/skills/johnrogers/claude-swift-engineering/swiftui-advanced"><img src="https://agentmods.dev/badge/skills/johnrogers/claude-swift-engineering/swiftui-advanced/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/swiftui-advanced"><img src="https://agentmods.dev/badge/skills/johnrogers/claude-swift-engineering/swiftui-advanced.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 | $0.00060 | $0.00637 |
| Opus 5 | $0.00030 | $0.00318 |
| Sonnet 5 | $0.00012 | $0.00127 |
| Haiku 4.5 | $0.00006 | $0.00064 |
Grade A, and why
swiftui-advanced 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 9d 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 — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SwiftUI Advanced
Advanced SwiftUI patterns for gesture composition, adaptive layouts, architecture decisions, and performance optimization.
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 |
|---|---|
| Gestures | Composing multiple gestures, GestureState, custom recognizers |
| Adaptive Layout | ViewThatFits, AnyLayout, size classes, iOS 26 free-form windows |
| Architecture | MVVM vs TCA decision, State-as-Bridge, property wrapper selection |
| Performance | Instruments 26, view body optimization, unnecessary updates |
Core Workflow
- Identify pattern category from user's question
- Load relevant reference for detailed patterns and code examples
- Apply pattern following the decision trees and anti-patterns
- Verify using provided checklists or profiling guidance
Decision Trees
Gesture Composition
- Both gestures at same time? ->
.simultaneously - One must complete before next? ->
.sequenced - Only one should win? ->
.exclusively
Layout Adaptation
- Pick best-fitting variant? ->
ViewThatFits - Animated H/V switch? ->
AnyLayout - Need actual dimensions? ->
onGeometryChange
Architecture Selection
- Small app, Apple patterns? -> @Observable + State-as-Bridge
- Complex presentation logic? -> MVVM with @Observable
- Rigorous testability needed? -> TCA
Common Mistakes
-
Gesture composition order matters —
.simultaneouslyand.sequencedhave different trigger timing. Swapping them silently changes behavior. Understand gesture semantics before using. -
ViewThatFits over-used — ViewThatFits remeasures on every view change. For animated H/V switches, use
AnyLayoutinstead. Use ViewThatFits only for static variant selection.
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.
- 9d ago First seen · 56 lines · 60 tokens per session scan A d9bb73267949
swiftui-advanced is a skill published in the GitHub repository johnrogers/claude-swift-engineering (228 stars, last pushed 7mo ago), licensed MIT. It adds 60 tokens to every session and 637 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 2026-08-30.
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