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swift-concurrency-expert

Swift Concurrency review and remediation for Swift 6.2+. Use when asked to review Swift Concurrency usage, improve concurrency compliance, or fix Swift concurrency compiler errors in a feature or file.

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包含的文件(3)

  • SKILL.md2.0 KB
  • references/swift-6-2-concurrency.md10.4 KB
  • references/swiftui-concurrency-tour-wwdc.md1.6 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

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.

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 @MainActor or move into an actor.
  • Background work: move expensive work into a @concurrent async function on a nonisolated type or use an actor to guard mutable state.
  • Sendable errors: prefer immutable/value types; add Sendable conformance only when correct; avoid @unchecked Sendable unless you can prove thread safety.

Reference material

  • See references/swift-6-2-concurrency.md for Swift 6.2 changes, patterns, and examples.
  • See references/approachable-concurrency.md when the project is opted into approachable concurrency mode.
  • See references/swiftui-concurrency-tour-wwdc.md for SwiftUI-specific concurrency guidance.

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