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Swift concurrency: async/await, Actor, Task, Sendable patterns.
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| name | swift-concurrency |
| promoted_to | swift |
| description | Swift concurrency: async/await, Actor, Task, Sendable patterns. |
| user-invocable | false |
| context | fork |
| agent | swift-general-engineer |
| routing | {"triggers":["swift concurrency","swift async await","Swift Actor","Swift Task group"],"not_for":"general Swift development (use swift-general-engineer agent) — this skill covers Swift concurrency patterns: actors, async/await, Sendable, structured concurrency","category":"swift","pairs_with":["swift-testing"]} |
Pattern catalog for Swift's structured concurrency model: async/await, Actors, TaskGroups, AsyncSequence, Sendable, and cancellation. Load the reference file matching the developer's question.
| Signal | Reference File | Content |
|---|---|---|
| async/await, Task, Sendable | references/fundamentals.md | async/await patterns, Task/Task.detached, Sendable/@Sendable |
| Actor, @MainActor, nonisolated | references/actor-isolation.md | Actor isolation, MainActor UI confinement, nonisolated opt-out |
| TaskGroup, AsyncSequence, AsyncStream, cancellation | references/task-patterns.md | Structured concurrency, rate-limited groups, streams, cancellation |
| Failure modes, common mistakes | references/preferred-patterns.md | Blocking MainActor, task leaking, actor reentrancy hazard |
TaskGroup over loose Task { } whenever possible; structured tasks propagate cancellation and errors automatically.-strict-concurrency=complete) and resolve all warnings before they become errors in Swift 6.Task stored in a property should have a corresponding cancellation path.references/fundamentals.md -- async/await, Task, Sendable basicsreferences/actor-isolation.md -- Actor, @MainActor, nonisolatedreferences/task-patterns.md -- TaskGroup, AsyncSequence, AsyncStream, cancellationreferences/preferred-patterns.md -- blocking, leaking, reentrancy mistakes