---

name: migrating-to-swift-concurrency description: Provides the complete Swift Concurrency Migration Guide. Use when migrating to Swift 6, resolving data-race safety errors, understanding Sendable and actor isolation, or incrementally adopting async/await.

Swift Concurrency Migration Guide

The complete content of the Swift Concurrency Migration Guide by Apple. This guide helps you migrate your code to take advantage of Swift's data-race safety guarantees and the Swift 6 language mode.

Documentation

• Data Race Safety (Guide/DataRaceSafety.md): Learn about the fundamental concepts Swift uses to enable data-race-free
• Migration Strategy (Guide/MigrationStrategy.md): Get started migrating your project to the Swift 6 language mode.
• Enable data-race safety checking (Guide/EnableDataRaceSafety.md): Use Swift 6 to get full data-race safety checking or add checking to an existing Swift 5 project.
• Common Compiler Errors (Guide/CommonProblems.md): Identify, understand, and address common problems you can encounter while
• Incremental Adoption (Guide/IncrementalAdoption.md): Learn how you can introduce Swift concurrency features into your project
• Migrating to upcoming language features (Guide/FeatureMigration.md): Migrate your project to upcoming language features.
• Source Compatibility (Guide/SourceCompatibility.md): See an overview of potential source compatibility issues.
• Library Evolution (Guide/LibraryEvolution.md): Annotate library APIs for concurrency while preserving source and ABI
• Runtime Behavior (Guide/RuntimeBehavior.md): Learn how Swift concurrency runtime semantics differ from other runtimes you may

Code Examples

Swift source files demonstrating migration patterns and concurrency concepts:

• Boundaries.swift (Examples/Boundaries.swift): Example code demonstrating Boundaries.
• ConformanceMismatches.swift (Examples/ConformanceMismatches.swift): Example code demonstrating ConformanceMismatches.
• DispatchQueue_PendingWork.swift (Examples/DispatchQueue_PendingWork.swift): Example code demonstrating DispatchQueue PendingWork.
• Globals.swift (Examples/Globals.swift): Example code demonstrating Globals.
• IncrementalMigration.swift (Examples/IncrementalMigration.swift): Example code demonstrating IncrementalMigration.
• PreconcurrencyImport.swift (Examples/PreconcurrencyImport.swift): Example code demonstrating PreconcurrencyImport.
• main.swift (Examples/main.swift): Example code demonstrating main.

Usage Notes

• Start with Data Race Safety to understand the core concepts
• Follow the Migration Strategy for a recommended approach
• Refer to Common Problems for solutions to typical issues
• Use the Code Examples as reference implementations

License & Attribution

Content License

The documentation and example code in this skill are from the Swift Concurrency Migration Guide, copyright Apple Inc. and the Swift project authors, distributed under the Apache 2.0 License.

Skill Structure License

The structure and organization of this skill (this index file) is copyright Kyle Hughes, distributed under the MIT License.