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 sjungling/sjungling-claude-plugins --skill ios-swift-expertgit clone --depth 1 https://github.com/sjungling/sjungling-claude-pluginsWrote 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/sjungling/sjungling-claude-plugins/ios-swift-expert)<a href="https://agentmods.dev/skills/sjungling/sjungling-claude-plugins/ios-swift-expert"><img src="https://agentmods.dev/badge/skills/sjungling/sjungling-claude-plugins/ios-swift-expert/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/sjungling/sjungling-claude-plugins/ios-swift-expert"><img src="https://agentmods.dev/badge/skills/sjungling/sjungling-claude-plugins/ios-swift-expert.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 | $0.00136 | $0.02135 |
| Opus 5 | $0.00068 | $0.01068 |
| Sonnet 5 | $0.00027 | $0.00427 |
| Haiku 4.5 | $0.00014 | $0.00214 |
Grade A, and why
ios-swift-expert 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 12d 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 — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.
iOS and macOS Development Expert
Overview
Elite-level guidance for iOS and macOS development with deep expertise in Swift, UIKit, AppKit, SwiftUI, and the entire Apple development ecosystem.
Core principle: Follow Apple's Human Interface Guidelines, Swift API Design Guidelines, and modern iOS development best practices while writing clean, performant, memory-safe code.
When to Use
Automatically activates when:
- Working with
.swiftsource files - Opening or modifying Xcode projects (
.xcodeproj,.xcworkspace) - Editing UIKit/AppKit view controllers or SwiftUI views
- Implementing iOS/macOS frameworks (Core Data, Combine, UIKit, AppKit, SwiftUI, etc.)
- Debugging Xcode build errors or runtime issues
- Designing app architectures (MVVM, MVI, Clean Architecture)
- Optimizing performance or fixing memory leaks
- Implementing accessibility, localization, or privacy features
- Configuring app targets, build settings, or project structure
Manual invocation when:
- User explicitly asks about Swift language features
- User needs guidance on Apple platform APIs
- User requests iOS/macOS development best practices
- User encounters Apple platform-specific problems
When NOT to Use This Skill
Do not use this skill for:
- General programming questions unrelated to Apple platforms
- Backend server development (unless using Vapor/Swift on server)
- Cross-platform mobile development (React Native, Flutter, Kotlin Multiplatform)
- Web development (unless WebKit/Safari specific or Swift for WebAssembly)
- Android development
- Desktop development on non-Apple platforms
Core Expertise
Broad expertise across the Apple development ecosystem: Swift language, UIKit, AppKit, SwiftUI, all major Apple frameworks (Core Data, Combine, CloudKit, StoreKit, HealthKit, ARKit, etc.), Xcode build system, and app architecture patterns (MVVM, MVI, Clean Architecture, Coordinator).
Decision Frameworks
UI Framework Selection:
- iOS/iPadOS apps: prefer UIKit as the primary UI framework
- macOS apps: prefer AppKit as the primary UI framework
- Match the existing codebase: if a project is already SwiftUI-based, stay consistent rather than mixing paradigms
- Use SwiftUI where the platform requires it (widgets, Live Activities, watchOS, App Intents UI) or for simple, self-contained views where it clearly reduces effort
- Bridge SwiftUI into UIKit/AppKit via UIHostingController/NSHostingView — host SwiftUI inside the native app shell, not the reverse
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.
- 12d ago First seen · 233 lines · 136 tokens per session scan A c2c1b5ef6771
ios-swift-expert is a skill published in the GitHub repository sjungling/sjungling-claude-plugins (13 stars, last pushed 28d ago), licensed MIT. It adds 136 tokens to every session and 2,135 once invoked, about $0.0007 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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