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 TalissonVitorino/kmp-ios-skills --skill storekitgit clone --depth 1 https://github.com/TalissonVitorino/kmp-ios-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/talissonvitorino/kmp-ios-skills/storekit)<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/storekit"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/storekit/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/talissonvitorino/kmp-ios-skills/storekit"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/storekit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00242 | $0.04270 |
| Opus 5 | $0.00121 | $0.02135 |
| Sonnet 5 | $0.00048 | $0.00854 |
| Haiku 4.5 | $0.00024 | $0.00427 |
Grade A, and why
storekit 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 — 383 lines — stays where its author put it; the contents beside it link to each section on GitHub.
StoreKit 2 (In-App Purchases & Subscriptions)
Modern async StoreKit for a fintech iOS app: sell products, verify transactions, gate entitlements, and keep the server as the source of truth. Grounded in Apple's StoreKit, StoreKit Views, and StoreKit Test frameworks (iOS 15+ APIs; iOS 26 era).
- Use StoreKit 2 (
import StoreKit,Product/Transaction), not the deprecatedSKPaymentQueue/SKProductStoreKit 1 API, for any new code. - Digital goods and subscriptions only. Real-world goods/services and money
movement go through Apple Pay / your PSP — see
passkit. Mixing them up is an App Store rejection (seeapp-store-review). - KMP boundary: IAP is Apple-native — keep it in
iosMain/Swift. Expose acommonMaininterface EntitlementStore { fun isSubscribed(): Boolean }and bind anactualthat reads the verified StoreKit entitlement; seeexpect-actualandkmp-ios-integration. Never let shared code decide purchase validity. - Trust the server, not the client. The device signal is for UX; grant paid
features from a server that validates transactions (App Store Server API) and
reacts to App Store Server Notifications V2 — see
references/server-and-security.md.
Contents
- Setup
- Fetch products
- Purchase + PurchaseResult
- Verification (VerificationResult)
- Entitlements + the updates listener
- Subscriptions (status / RenewalState)
- SwiftUI store views
- Offers (intro / promotional / win-back / offer codes)
- Refunds & manage subscriptions
- Ask to Buy & Family Sharing
- StoreKit testing (.storekit)
- Correctness checklist
- References:
references/server-and-security.md,references/offers-and-testing.md
Setup
- Add the In-App Purchase capability; configure products in App Store Connect
(or a
.storekitfile for local testing — see below). - Product IDs are opaque strings; keep them in one typed source of truth:
What ships with it
2 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.
- 7d ago First seen · 383 lines · 242 tokens per session scan A c84403979f06
storekit is a skill published in the GitHub repository TalissonVitorino/kmp-ios-skills (12 stars, last pushed 17d ago), licensed MIT. It adds 242 tokens to every session and 4,270 once invoked, about $0.0012 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 2026-09-03.
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