Swift Concurrency

Apply the smallest change that makes isolation and ownership correct while preserving observable behavior.

Contents

• Scope and Toolchain Preflight
• Diagnostic Workflow
• Isolation Decisions
• Safety Rules
• Interop and Streams
• Common Mistakes
• Review Checklist
• References

Scope and Toolchain Preflight

This skill owns compiler concurrency diagnostics, actor isolation, Sendable, task structure, cancellation, reentrancy, async sequences, continuations, and synchronization. Route routine SwiftUI .task ownership to swiftui-patterns, app architecture to swift-architecture, and test syntax to swift-testing.