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 private-api-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/private-api-audit)<a href="https://agentmods.dev/skills/cruisediary/apple-app-review-skills/private-api-audit"><img src="https://agentmods.dev/badge/skills/cruisediary/apple-app-review-skills/private-api-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/private-api-audit"><img src="https://agentmods.dev/badge/skills/cruisediary/apple-app-review-skills/private-api-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 | $0.00047 | $0.02036 |
| Opus 5 | $0.00023 | $0.01018 |
| Sonnet 5 | $0.00009 | $0.00407 |
| Haiku 4.5 | $0.00005 | $0.00204 |
Grade A, and why
private-api-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 7d 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 — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Private API Audit
Purpose
Detects usage of private Apple APIs, undocumented frameworks, and runtime introspection patterns that bypass the public SDK — enforcing Guideline 2.5.1 which allows only public APIs and frameworks. Private API usage causes automated binary rejection at upload and account termination on repeated violations.
Apple Guideline
- Primary: 2.5.1 — Performance: Public APIs Only
- Related: 2.5.4
- Reference:
references/guidelines/2-performance.md
Real-World Rejection Cases
-
Case: App used
dlopento load a private framework at runtime — rejected with ITMS-90338 "Non-public API usage" during automated binary analysis Source: Apple Developer Forums (multiple reports) Root cause: Apple's automated binary analysis scans fordlopencalls and symbol references to non-public frameworks — even if the app passes human review, the binary scanner will catch private API usage and reject with a specific ITMS error code -
Case: App called
[UIDevice _supportsForceTouch]via performSelector to detect 3D Touch capability on older devices — Apple's binary scanner flagged the underscore-prefixed private method Source: Stack Overflow (private API detection reports) Root cause: Apple's static analysis flags any symbol beginning with an underscore that resolves to a private UIKit or Foundation method — use only public APIs with@availablechecks for feature detection -
Case: App used
NSClassFromString(@"_UIBackdropView")to access a private UIKit view class for a visual effect — binary was rejected before human review Source: Apple Developer Forums (2.5.1 enforcement reports) Root cause:NSClassFromStringwith internal Apple class names (prefixed with_UI,_NS,CA) is treated as private API usage by the binary scanner
Trigger
Invoke on any iOS/macOS project before App Store submission to detect private API patterns that cause automated rejection.
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.
- 7d ago First seen · 143 lines · 47 tokens per session scan A a31d41689d79
private-api-audit is a skill published in the GitHub repository cruisediary/apple-app-review-skills (16 stars, last pushed 4mo ago), licensed MIT. It adds 47 tokens to every session and 2,036 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.
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