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 5.5 | $0.00097 | $0.01708 |
| Sonnet 5.5 | $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 1mo 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.
- 1mo 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 (16 stars, last pushed 2mo ago), licensed MIT. It adds 242 tokens to every session and 4,270 once invoked, about $0.0010 per session on Opus 5.5. 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.
Other skills, from other repositories
compose-multiplatform
Use when building one shared Compose UI in Kotlin across Android, iOS, and desktop — commonMain @Composables, expect/actual, source-set placement, native interop, multiplatform ViewModel/navigation/Koin. NOT a single-platform native build (that is kotlin-android / swift-ios), and NOT Dart/Flutter cross-platform UI…
cmp-firebase-connect
Add Firebase to a create-cmp app and wire it to its OWN real Firebase project. Use this when the user wants Firebase in their app, or asks "add firebase", "connect my app to firebase", "set up google-services.json", "wire firebase", "create a firebase project for this app", "replace the mock firebase config", "get a…
cmp-audit
Adversarial audit of one subsystem of a Kotlin/Compose Multiplatform app against its spec AND against platform semantics — the class of defect desktop-tier tests cannot see (alarms, notifications, PendingIntents, reboot, process death, DST). Use this when the user says "audit the notifications", "double check X for…
add-feature
Add a new conforming vertical-slice feature (Screen + ViewModel + UseCase + Repository + spec + tests + golden tree + nav route + DI wiring) to this Compose Multiplatform app, cloned deterministically from the project's configured exemplar feature (qa/approvals.json's exemplarFeature — home by default). Use this when…
add-screen
Add a presentation-only slice — Screen + ViewModel + tests + golden tree + spec + nav route — for an EXISTING entity/repository in this Compose Multiplatform app, cloned deterministically from the project's configured exemplar feature's presentation layer (qa/approvals.json's exemplarFeature — home by default).…
add-repository
Add a data/domain slice ONLY — model, repository interface + impl, use case, and a hand-written fake — to this Compose Multiplatform app, cloned deterministically from the project's configured exemplar feature's data layer (qa/approvals.json's exemplarFeature — home by default). No screen, no ViewModel, no nav route…