swift-concurrency-expert
Review and fix Swift concurrency issues such as actor isolation and Sendable violations.
Swift Concurrency Expert
Overview
Review and fix Swift Concurrency issues in Swift 6.2+ codebases by applying actor isolation, Sendable safety, and modern concurrency patterns with minimal behavior changes.
When to Use
- When the user asks to review Swift concurrency usage or fix compiler diagnostics.
- When you need guidance on actor isolation,
Sendable,@MainActor, or async migration.
Workflow
1. Triage the issue
- Capture the exact compiler diagnostics and the offending symbol(s).
- Check project concurrency settings: Swift language version (6.2+), strict concurrency level, and whether approachable concurrency (default actor isolation / main-actor-by-default) is enabled.
- Identify the current actor context (
@MainActor,actor,nonisolated) and whether a default actor isolation mode is enabled. - Confirm whether the code is UI-bound or intended to run off the main actor.
2. Apply the smallest safe fix
Prefer edits that preserve existing behavior while satisfying data-race safety.
Common fixes:
- UI-bound types: annotate the type or relevant members with
@MainActor. - Protocol conformance on main actor types: make the conformance isolated (e.g.,
extension Foo: @MainActor SomeProtocol). - Global/static state: protect with
@MainActoror move into an actor. - Background work: move expensive work into a
@concurrentasy
Subscribers only
The full skill, its 5 bundled files and every download is included with every paid Complete AI plan.
Details
| Source | Dimillian/Skills (MIT) |
|---|---|
| License | — |
| Risk label | safe ("critical" means the skill may run commands or touch files — read before use) |
| Files | SKILL.md, agents/openai.yaml, references/approachable-concurrency.md, references/swift-6-2-concurrency.md, references/swiftui-concurrency-tour-wwdc.md |
| Added | 2026-03-25 |
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