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Agent skill

Storekit

by johnrogers in johnrogers/claude-swift-engineering

A skill your agent uses when implementing in-app purchases, StoreKit 2 subscriptions, consumables, non-consumables, or transaction handling.

MITAuto-check passedMobile

Install Storekit

skills CLI
$ npx skills add johnrogers/claude-swift-engineering --skill storekit -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install johnrogers/claude-swift-engineering storekit --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/johnrogers/claude-swift-engineering.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/swift-engineering/skills/storekit .claude/skills/storekit && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
storekit
GitHub stars
231
Token cost
~799 tokens
SKILL.md length
285 words
Files
6 (incl. references)
Skills in repo
17
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when implementing in-app purchases, StoreKit 2 subscriptions, consumables, non-consumables, or transaction handling.

  • Works in 6 steps: Create .storekit configuration file… → Test purchases locally in Xcode simulator → Implement centralized StoreManager with… → …
  • Implementing in-app purchases
  • SKILL.md covers Reference Loading Guide, Core Workflow, Essential Architecture and Common Mistakes
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Storekit is an agent skill from johnrogers/claude-swift-engineering. Use when implementing in-app purchases, StoreKit 2 subscriptions, consumables, non-consumables, or transaction handling. Covers testing-first workflow with .storekit configuration, StoreManager architecture, and transaction verification.

Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `references/getting-started.md`, `references/products.md` and `references/storekit-views.md`).

It sits in Mobile, covering iOS development. The repository describes itself as: A collection of agents and skills to aid in the planning, implementation, documentation and testing of Swift/TCA code. The licence is MIT.

When your agent uses it

  • Implementing in-app purchases
  • StoreKit 2 subscriptions
  • Non-consumables
  • Transaction handling

Example prompts

  • “/storekit”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Create .storekit configuration file first (before any code)
  2. Test purchases locally in Xcode simulator
  3. Implement centralized StoreManager with @MainActor
  4. Set up Transaction.updates listener at app launch
  5. Display products with ProductView or custom UI
  6. Always call transaction.finish() after granting entitlements

What it can do on your machine

Read from SKILL.md and the folder at commit 1dc2cf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are swift).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Storekit loads about 799 tokens when it runs, and up to ~5k if it reads all its reference files. Until then it costs about 62 tokens; SKILL.md has 285 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~62
When it runs · the whole SKILL.md, loaded when a task matches
~799
With references · SKILL.md plus every file in references/, read only if the agent opens them
~5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from johnrogers/claude-swift-engineering at commit 1dc2cf4, republished under its MIT licence (© johnrogers). 285 words, ~799 tokens.

Download SKILL.mdSave it as .claude/skills/storekit/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.
name
storekit
description
Use when implementing in-app purchases, StoreKit 2 subscriptions, consumables, non-consumables, or transaction handling. Covers testing-first workflow with .storekit configuration, StoreManager architecture, and transaction verification.

StoreKit

StoreKit 2 patterns for implementing in-app purchases with async/await APIs, automatic verification, and SwiftUI integration.

Reference Loading Guide

ALWAYS load reference files if there is even a small chance the content may be required. It's better to have the context than to miss a pattern or make a mistake.

ReferenceLoad When
Getting StartedSetting up .storekit configuration file, testing-first workflow
ProductsLoading products, product types, purchasing with Product.purchase()
SubscriptionsAuto-renewable subscriptions, subscription groups, offers, renewal tracking
TransactionsTransaction listener, verification, finishing transactions, restore purchases
StoreKit ViewsProductView, SubscriptionStoreView, SubscriptionOfferView in SwiftUI

Core Workflow

  1. Create .storekit configuration file first (before any code)
  2. Test purchases locally in Xcode simulator
  3. Implement centralized StoreManager with @MainActor
  4. Set up Transaction.updates listener at app launch
  5. Display products with ProductView or custom UI
  6. Always call transaction.finish() after granting entitlements

Essential Architecture

swift
@MainActor
final class StoreManager: ObservableObject {
    @Published private(set) var products: [Product] = []
    @Published private(set) var purchasedProductIDs: Set<String> = []
    private var transactionListener: Task<Void, Never>?

    init() {
        transactionListener = listenForTransactions()
        Task { await loadProducts() }
    }
}

Common Mistakes

  1. Missing .finish() calls on transactions — Forgetting to call transaction.finish() after granting entitlements causes transactions to never complete. The user won't see their purchase reflected. Always call finish().

  2. Unsafe StoreManager state — Shared StoreManager without @MainActor can have race conditions. Multiple async tasks can update @Published properties concurrently, corrupting state. Use @MainActor for thread safety.

  3. No transaction listener at app launch — Not setting up Transaction.updates listener means app crashes or misses refunded/canceled purchases. Listen for transactions immediately in @main, not when user taps purchase button.

  4. Hardcoded product IDs — Hardcoded IDs make testing and localization hard. Use configuration files or environment variables for product IDs. Same applies to prices (fetch from App Store, don't hardcode).

  5. Ignoring verification failures — App Store verification fails silently sometimes. Not checking verification status means accepting unverified transactions (security risk). Always verify before granting entitlements.

© johnrogers, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files (references) in plugins/swift-engineering/skills/storekit of johnrogers/claude-swift-engineering.

  • SKILL.md
  • references/getting-started.md
  • references/products.md
  • references/storekit-views.md
  • references/subscriptions.md
  • references/transactions.md

Open the folder on GitHubat commit 1dc2cf4

Compare with similar skills

Storekit next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Storekit compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Storekit this skilljohnrogers/claude-swift-engineering231—~799Automated safety check: PassMIT
Swiftui Protwostraws/SwiftUI-Agent-Skill5.1k2 repos~1.5kAutomated safety check: PassMIT
Swiftui UI PatternsAFK-surf/OpenBridge4304 repos~887Automated safety check: PassMIT
Swiftui Performance Auditharperreed/dotfiles3348 repos~1.4kAutomated safety check: PassNone
Swift Testing ExpertAvdLee/Swift-Testing-Agent-Skill4691 repos~1.2kAutomated safety check: PassMIT
Hig Project Contextraintree-technology/hig-doctor1435 repos~1.2kAutomated safety check: PassMIT

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Categories

Questions about Storekit

What does Storekit do?

A skill your agent uses when implementing in-app purchases, StoreKit 2 subscriptions, consumables, non-consumables, or transaction handling. Storekit is an agent skill from johnrogers/claude-swift-engineering. Use when implementing in-app purchases, StoreKit 2 subscriptions, consumables, non-consumables, or transaction handling.

When should I use Storekit?

Storekit fits situations like: implementing in-app purchases; storeKit 2 subscriptions; non-consumables; transaction handling.

How do I install Storekit in Claude Code?

Run `npx skills add johnrogers/claude-swift-engineering --skill storekit -a claude-code`. Or copy the skill folder (plugins/swift-engineering/skills/storekit in johnrogers/claude-swift-engineering) into .claude/skills/storekit in your project. Claude Code loads it when a task matches its description.

How do I install Storekit in Codex?

Run `npx skills add johnrogers/claude-swift-engineering --skill storekit -a codex`. Or copy the skill folder (plugins/swift-engineering/skills/storekit in johnrogers/claude-swift-engineering) into .agents/skills/storekit in your project. Codex loads it when a task matches its description.

Can I use Storekit in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add johnrogers/claude-swift-engineering --skill storekit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/storekit, .gemini/skills/storekit, .github/skills/storekit and .opencode/skills/storekit in your project.

What does Storekit need to run?

SKILL.md names no scripts, command-line tools or credentials: Storekit is instructions for the agent only.

Does Storekit access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Storekit safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Storekit use?

Storekit is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Storekit use?

About 799 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.2k tokens, read only when the agent opens those files.

What are the alternatives to Storekit?

Skills that share tags, products or a category with Storekit: Swiftui Pro (twostraws/SwiftUI-Agent-Skill, 5.1k stars), Swiftui UI Patterns (AFK-surf/OpenBridge, 430 stars), Swiftui Performance Audit (harperreed/dotfiles, 334 stars) and Swift Testing Expert (AvdLee/Swift-Testing-Agent-Skill, 469 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Storekit?

johnrogers (a GitHub user) maintains it in johnrogers/claude-swift-engineering, which has 231 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on January 18, 2026.

Source: johnrogers/claude-swift-engineering on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.