Developer Tools & Repos Agent Skills for ChatGPT

When to activate: Swift/Objective-C interop, @objc, bridging headers, C interop, Swift/C++ interop, NS prefixed types

Swift 6.1–6.3 knowledge: default MainActor isolation, @concurrent, InlineArray, Span, @c interop, module selectors, Swift Testing updates.

Use when reviewing Swift code for modern idioms, working with noncopyable types, implementing drag and drop, adding debug deep links, or…

When to activate: Swift Macros, @attached, freestanding macros, #stringify, macro expansion, SE-0382, SE-0389

Use when Swift code owns a unique resource, has `~Copyable`/`borrowing`/`consuming` diagnostics, or needs an ownership-aware API.

When to activate: Swift Package Manager, Package.swift, dependencies, targets, products, local packages, version resolution

Use when the task claims a latency, throughput, allocation, memory, startup, compilation, or energy improvement, or when optimizing hot…

Use when optimizing Swift code performance, reducing memory usage, improving runtime efficiency, dealing with COW, ARC overhead, generics…

When to activate: Swift performance optimization, value types, COW, ARC, Instruments profiling, memory layout, compile-time optimization

Use when protocol-oriented programming in Swift including protocol extensions, default implementations, protocol composition, associated…

When to activate: Swift protocols, protocol extensions, associated types, protocol composition, existentials, primary associated types…

Use for an adversarial review of a Swift diff or pull request.

When to activate: Keychain, certificate pinning, encryption, biometrics, secure storage, App Transport Security in Swift

This skill should be used when the user is working with Swift or SwiftUI, asks to "write SwiftUI code", "create iOS app", "fix SwiftUI…

- Building iOS, iPadOS, or macOS apps with SwiftUI - Implementing async/await networking with URLSession - Setting up Core Data for local…

Use when writing unit tests, adopting Swift Testing framework, making tests run faster without simulator, architecting code for…

Use when Swift code has copying, mutation, identity, copy-on-write, large aggregates, or a struct-versus-class decision.

Use when working with SwiftData - @Model definitions, @Query in SwiftUI, @Relationship macros, ModelContext patterns, CloudKit…

Use when the user mentions SwiftData review, @Model issues, SwiftData migration safety, or SwiftData performance checking.

Reviews SwiftData code for model design, queries, concurrency, and migrations.

Use when creating SwiftData custom schema migrations with VersionedSchema and SchemaMigrationPlan - property type changes, relationship…