Guides type-driven design in Rust. Use when encoding invariants in types, applying newtype pattern, implementing type state machines, using PhantomData, or making invalid states unrepresentable.
インストール方法を見るインストールする前に、エージェントに与えられる指示の中身を確認できます。
Layer 1: Language Mechanics
How can the type system prevent invalid states?
Before reaching for runtime checks:
Before adding runtime validation:
Can the type encode the constraint?
When is validation possible?
Result with clear errorWho needs to know the invariant?
| Pattern | Purpose | Example |
|---|---|---|
| Newtype | Type safety | struct UserId(u64); |
| Type State | State machine | Connection<Connected> |
| PhantomData | Variance/lifetime | PhantomData<&'a T> |
| Marker Trait | Capability flag | trait Validated {} |
| Builder | Gradual construction | Builder::new().name("x").build() |
| Sealed Trait | Prevent external impl | mod private { pub trait Sealed {} } |
struct Email(String); // Not just any string
impl Email {
pub fn new(s: &str) -> Result<Self, ValidationError> {
// Validate once, trust forever
validate_email(s)?;
Ok(Self(s.to_string()))
}
}
struct Connection<State>(TcpStream, PhantomData<State>);
struct Disconnected;
struct Connected;
struct Authenticated;
impl Connection<Disconnected> {
fn connect(self) -> Connection<Connected> { todo!() }
}
impl Connection<Connected> {
fn authenticate(self) -> Connection<Authenticated> { todo!() }
}
// compile error if you call authenticate() on Disconnected
| Need | Pattern |
|---|---|
| Type safety for primitives | Newtype |
| Compile-time state validation | Type State |
| Lifetime/variance markers | PhantomData |
| Capability flags | Marker Trait |
| Gradual construction | Builder |
| Closed set of impls | Sealed Trait |
| Anti-Pattern | Why Bad | Better |
|---|---|---|
| Boolean flags for states | Runtime errors | Type state |
| String for semantic types | No type safety | Newtype |
Option for uninitialized | Unclear invariant | Builder |
| Public fields with invariants | Invariant violation | Private + validated new() |
zero-cost-abstractions — trait design for newtypeserror-handling — validation errors in constructorsanti-patterns — primitive obsession and boolean blindnessまだレビューはありません。使ってみた感想をお寄せください。
概要と使いどころ
Add an iOS App Clip target to an Expo app. Use when the user mentions App Clip, AASA, apple-app-site-association, appclips, smart app banner, or wants to ship a lightweight iOS Clip invoked from a URL alongside their parent app.
日本語の概要は準備中です。原文の説明を表示しています。
Automates browser interactions for web testing, form filling, screenshots, and data extraction. Use when the user needs to navigate websites, interact with web pages, fill forms, take screenshots, test web applications, or extract information from web pages.
日本語の概要は準備中です。原文の説明を表示しています。
Add Agentation visual feedback toolbar to a Next.js project
日本語の概要は準備中です。原文の説明を表示しています。
Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.
日本語の概要は準備中です。原文の説明を表示しています。
Derive and implement first-principles audio-coupled haptic and kinetic UI feedback. Use when designing, reviewing, or coding haptics/audio for mobile apps, native iOS/Android, React Native/Expo, SwiftUI, games, detent pickers, toggles, sliders, page curls, scroll gestures, wallet/signature flows, Solana transactions, backend/realtime state changes, confirmations, settlements, and semantic UI events where feedback should follow signal math instead of ad hoc vibration calls.
日本語の概要は準備中です。原文の説明を表示しています。
Babysit a GitHub pull request during a user-approved monitoring window by polling review comments, CI checks/workflow runs, and mergeability state. Diagnose failures, retry likely flaky failures up to 3 times, auto-fix/push branch-related issues when appropriate, and report fresh review feedback. Use when the user asks Codex to monitor a PR, watch CI, handle review comments, or keep an eye on failures and feedback on an open PR.
日本語の概要は準備中です。原文の説明を表示しています。