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 cruisediary/apple-app-review-skills --skill usage-description-auditgit clone --depth 1 https://github.com/cruisediary/apple-app-review-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/cruisediary/apple-app-review-skills/usage-description-audit)<a href="https://agentmods.dev/skills/cruisediary/apple-app-review-skills/usage-description-audit"><img src="https://agentmods.dev/badge/skills/cruisediary/apple-app-review-skills/usage-description-audit/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/cruisediary/apple-app-review-skills/usage-description-audit"><img src="https://agentmods.dev/badge/skills/cruisediary/apple-app-review-skills/usage-description-audit.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 | $0.00038 | $0.02303 |
| Opus 5 | $0.00019 | $0.01151 |
| Sonnet 5 | $0.00008 | $0.00461 |
| Haiku 4.5 | $0.00004 | $0.00230 |
Grade A, and why
usage-description-audit 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 6d 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 — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Usage Description Audit
Purpose
Detects missing or insufficiently descriptive NS*UsageDescription keys in Info.plist that cause guaranteed App Store rejection under Guideline 5.1.1(ii).
Apple Guideline
- Primary: 5.1.1(ii) — Data Collection and Storage: Purpose Strings
- Related: 5.1.1(i), 5.1.2
- Reference:
references/guidelines/5-legal.md
Real-World Rejection Cases
-
Case: OneSignal SDK silently added
NSLocationAlwaysUsageDescriptiondependency, app rejected for missing key even though developer never used location Source: https://github.com/OneSignal/OneSignal-iOS-SDK/issues/490 Root cause: Third-party SDK references location APIs, requiring NSUsageDescription even if app doesn't call them directly. Note:NSLocationAlwaysUsageDescriptionis deprecated since iOS 11. The current required key isNSLocationAlwaysAndWhenInUseUsageDescription. Some older SDKs may still inject the deprecated key — add both keys if using Always authorization to cover all iOS versions. -
Case: Urban Airship library caused rejection for
NSLocationAlwaysUsageDescriptionnot set by developer Source: https://github.com/urbanairship/ios-library/issues/205 Root cause: SDK dependency chain included location APIs without developer's knowledge. Always auditPods/and.build/dependency trees for injectedNSUsageDescriptionkeys after adding a new SDK. -
Case: Generic string "App needs access" rejected — reviewer flagged as insufficient justification Source: Apple Developer Forums Root cause: Purpose strings must clearly describe the specific use case, not generic access reasons
-
Case: App declared NSCameraUsageDescription in Info.plist but had no camera feature in the UI — reviewer could not find any camera usage — rejected for requesting unnecessary permission under Guideline 5.1.1(ii) Source: Apple Developer Forums (Guideline 5.1.1 threads on unnecessary permission requests) Root cause: Requesting a permission not actually used in the app violates Guideline 5.1.1(ii); remove any NS*UsageDescription key for APIs the app does not actually call
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.
- 6d ago First seen · 161 lines · 38 tokens per session scan A 9cc92cbafbf6
usage-description-audit is a skill published in the GitHub repository cruisediary/apple-app-review-skills (16 stars, last pushed 4mo ago), licensed MIT. It adds 38 tokens to every session and 2,303 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 2026-09-05.
Other skills, from other repositories
boutique-store
Create and use Boutique Store for Swift data persistence, including initialization, @Stored controllers, CRUD operations, operation chaining, and granular event monitoring. Use when persisting arrays of items, building data controllers, or working with Boutique's Store type.
boutique-stored-values
Persist individual values with Boutique's @StoredValue (UserDefaults) and @SecurelyStoredValue (Keychain), including set, reset, toggle, bindings, keypath setters, array and dictionary helpers, and async observation. Use when storing preferences, settings, feature flags, or sensitive data like auth tokens.
boutique-swiftui
Integrate Boutique with SwiftUI views using onChange, onStoreDidLoad, bindings, and preview stores. Use when building SwiftUI views that display or react to Boutique-persisted data.
swift-expert
Expert-level Swift development for iOS, macOS with SwiftUI, Combine, and modern Swift 5.9+. Use when the user mentions iOS, macOS, SwiftUI, Combine, async await, or Apple platforms, or when the task involves Modern Swift Features, Basics and Optionals, Functions and Closures, or Structs and Classes.
swift-focusengine-pro
Reviews, writes, and fixes focus management code for all Apple platforms (tvOS, iOS/iPadOS, watchOS, visionOS, macOS), covering SwiftUI, UIKit, AppKit, and RealityKit. Use when reading, writing, or reviewing apps that handle focus, hover, key view loops, or Digital Crown navigation.
app-store-review
Audit an iOS app's App Store submission readiness and rejection risk for a fintech app — App Review Guidelines domains (Safety/Performance/Business/Design/Legal), PrivacyInfo.xcprivacy (NSPrivacyAccessedAPITypes required-reason APIs, NSPrivacyTrackingDomains, NSPrivacyCollectedDataTypes), App Privacy nutrition labels…