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 Abdullah4AI/apple-developer-toolkit --skill state-managementgit clone --depth 1 https://github.com/Abdullah4AI/apple-developer-toolkitWrote 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/abdullah4ai/apple-developer-toolkit/state-management)<a href="https://agentmods.dev/skills/abdullah4ai/apple-developer-toolkit/state-management"><img src="https://agentmods.dev/badge/skills/abdullah4ai/apple-developer-toolkit/state-management/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/abdullah4ai/apple-developer-toolkit/state-management"><img src="https://agentmods.dev/badge/skills/abdullah4ai/apple-developer-toolkit/state-management.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 | $0.00028 | $0.02935 |
| Opus 5 | $0.00014 | $0.01468 |
| Sonnet 5 | $0.00006 | $0.00587 |
| Haiku 4.5 | $0.00003 | $0.00294 |
Grade A, and why
state-management 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 5d 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 — 453 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SwiftUI State Management Reference
Property Wrapper Selection Guide
| Wrapper | Use When | Notes |
|---|---|---|
@State |
Internal view state that triggers updates | Must be private |
@Binding |
Child view needs to modify parent's state | Don't use for read-only |
@Bindable |
iOS 17+: View receives @Observable object and needs bindings |
For injected observables |
let |
Read-only value passed from parent | Simplest option |
var |
Read-only value that child observes via .onChange() |
For reactive reads |
Legacy (Pre-iOS 17):
| Wrapper | Use When | Notes |
|---|---|---|
@StateObject |
View owns an ObservableObject instance |
Use @State with @Observable instead |
@ObservedObject |
View receives an ObservableObject from outside |
Never create inline |
@State
Always mark @State properties as private. Use for internal view state that triggers UI updates.
// Correct
@State private var isAnimating = false
@State private var selectedTab = 0
Why Private? Marking state as private makes it clear what's created by the view versus what's passed in. It also prevents accidentally passing initial values that will be ignored (see "Don't Pass Values as @State" below).
iOS 17+ with @Observable (Preferred)
Always prefer @Observable over ObservableObject. With iOS 17's @Observable macro, use @State instead of @StateObject:
@Observable
@MainActor // Always mark @Observable classes with @MainActor
final class DataModel {
var name = "Some Name"
var count = 0
}
struct MyView: View {
@State private var model = DataModel() // Use @State, not @StateObject
var body: some View {
VStack {
TextField("Name", text: $model.name)
Stepper("Count: \(model.count)", value: $model.count)
}
}
}
Note: You may want to mark @Observable classes with @MainActor to ensure thread safety with SwiftUI, unless your project or package uses Default Actor Isolation set to MainActor—in which case, the explicit attribute is redundant and can be omitted.
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.
- 5d ago First seen · 453 lines · 28 tokens per session scan A 0cac5ffd1d6a
state-management is a skill published in the GitHub repository Abdullah4AI/apple-developer-toolkit (10 stars, last pushed yesterday), licensed MIT. It adds 28 tokens to every session and 2,935 once invoked, about $0.0001 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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