Migrating To Swift Concurrency
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.
Install
$ agentstack add skill-kylehughes-the-unofficial-swift-concurrency-migration-skill-migrating-to-swift-concurrency ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
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Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
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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](Guide/DataRaceSafety.md)): Learn about the fundamental concepts Swift uses to enable data-race-free
- Migration Strategy ([Guide/MigrationStrategy.md](Guide/MigrationStrategy.md)): Get started migrating your project to the Swift 6 language mode.
- Enable data-race safety checking ([Guide/EnableDataRaceSafety.md](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](Guide/CommonProblems.md)): Identify, understand, and address common problems you can encounter while
- Incremental Adoption ([Guide/IncrementalAdoption.md](Guide/IncrementalAdoption.md)): Learn how you can introduce Swift concurrency features into your project
- Migrating to upcoming language features ([Guide/FeatureMigration.md](Guide/FeatureMigration.md)): Migrate your project to upcoming language features.
- Source Compatibility ([Guide/SourceCompatibility.md](Guide/SourceCompatibility.md)): See an overview of potential source compatibility issues.
- Library Evolution ([Guide/LibraryEvolution.md](Guide/LibraryEvolution.md)): Annotate library APIs for concurrency while preserving source and ABI
- Runtime Behavior ([Guide/RuntimeBehavior.md](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](Examples/Boundaries.swift)): Example code demonstrating Boundaries.
- ConformanceMismatches.swift ([Examples/ConformanceMismatches.swift](Examples/ConformanceMismatches.swift)): Example code demonstrating ConformanceMismatches.
- DispatchQueuePendingWork.swift ([Examples/DispatchQueuePendingWork.swift](Examples/DispatchQueue_PendingWork.swift)): Example code demonstrating DispatchQueue PendingWork.
- Globals.swift ([Examples/Globals.swift](Examples/Globals.swift)): Example code demonstrating Globals.
- IncrementalMigration.swift ([Examples/IncrementalMigration.swift](Examples/IncrementalMigration.swift)): Example code demonstrating IncrementalMigration.
- PreconcurrencyImport.swift ([Examples/PreconcurrencyImport.swift](Examples/PreconcurrencyImport.swift)): Example code demonstrating PreconcurrencyImport.
- main.swift ([Examples/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](LICENSE.txt).
Skill Structure License
The structure and organization of this skill (this index file) is copyright Kyle Hughes, distributed under the MIT License.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: kylehughes
- Source: kylehughes/the-unofficial-swift-concurrency-migration-skill
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.