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Found 415 Skills
Discovers business domains in a Swift codebase by tracing what users can DO — not by reading folder names or architecture docs. Maps each domain's vertical slice (Types → Config → Repo → Service → Runtime → UI), identifies providers (external SDK bridges), and separates cross-cutting concerns. Produces a domain map that drives all downstream decisions: folder structure, SPM targets, enforcement specs, migration plans. Use this skill whenever the user wants to understand their codebase domains, find what's cross-cutting vs domain-specific, restructure a Swift project, figure out where code belongs, or map a product's capabilities to architectural boundaries. Triggers on "what are my domains", "where does this belong", "map this codebase", "what's cross-cutting", "organize this project", "is this a domain or infra", "restructure this", "architecture review", or any request to understand the business domain structure of a Swift codebase.
Build, review, or improve Core Data persistence in apps that have not adopted SwiftData. Use when working with NSManagedObject subclasses, NSFetchedResultsController for list-driven UI, NSBatchInsertRequest / NSBatchDeleteRequest / NSBatchUpdateRequest for bulk operations, NSPersistentHistoryChangeRequest for persistent history tracking and multi-target sync, NSStagedMigrationManager for staged schema migrations (iOS 17+), NSCompositeAttributeDescription for composite attributes (iOS 17+), or when integrating Core Data threading with Swift Concurrency. For Core Data + SwiftData coexistence or migration, see the swiftdata skill instead.
Debug SwiftUI application issues systematically. This skill helps diagnose and resolve SwiftUI-specific problems including view update failures, state management issues with @State/@Binding/@ObservedObject, NavigationStack problems, memory leaks from retain cycles, preview crashes, Combine publisher issues, and animation glitches. Provides Xcode debugger techniques, Instruments profiling, and LLDB commands for iOS/macOS development.
iOS development expert including SwiftUI, UIKit, and Apple frameworks
Expert guidance on SwiftNIO best practices, patterns, and implementation. Use when developers mention: (1) SwiftNIO, NIO, ByteBuffer, Channel, ChannelPipeline, ChannelHandler, EventLoop, NIOAsyncChannel, or NIOFileSystem, (2) EventLoopFuture, ServerBootstrap, or DatagramBootstrap, (3) TCP/UDP server or client implementation, (4) ByteToMessageDecoder or wire protocol codecs, (5) binary protocol parsing or serialization, (6) blocking the event loop issues.
iOS, iPadOS, and tvOS development with Swift, SwiftUI, and UIKit. Use when building Apple platform apps, implementing iOS-specific features, or following Apple Human Interface Guidelines.
Use when implementing drag and drop, copy/paste, ShareLink, or ANY content sharing between apps or views - covers Transferable protocol, TransferRepresentation types, UTType declarations, SwiftUI surfaces, and NSItemProvider bridging
The Composable Architecture (TCA) - A library for building Swift applications with state management, composition, and testability
Expert guidance on The Composable Architecture (TCA) for Swift, focusing on ReducerProtocol, macros, and testability.
Build, test, and manage Xcode projects and Swift packages. Use when the user mentions Xcode, iOS/macOS app development, simulators, Swift packages, or needs to build/test Apple platform apps. Triggers on "build", "run", "test", "simulator", "xcodebuild", "swift package", "iOS app", "macOS app".
Write, review, or improve SwiftUI code following best practices for state management, view composition, performance, and modern APIs. Use when building SwiftUI features, refactoring views, reviewing code quality, or adopting modern SwiftUI patterns.
Generate SwiftUI components following Apple HIG. Use when creating iOS UI components, building SwiftUI views, or need code scaffolding for iOS interfaces.