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swift-concurrency-6-2

Migrate Swift 6.2 code to actor-isolated async execution with explicit @concurrent parallelism.

1|Updated Mar 3, 2026
Search Tags:#concurrency#swift#mainactor#actor isolation#cpu offloading#data race prevention#protocol conformances
One-click install
npx skills add https://github.com/samymity/bridge-ventures-backend --skill swift-concurrency-6-2-samymity
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-concurrency-6-2
Source: https://github.com/samymity/bridge-ventures-backend/tree/main/.claude/skills/swift-concurrency-6-2
Command: npx skills add https://github.com/samymity/bridge-ventures-backend --skill swift-concurrency-6-2-samymity

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Swift 6.2 prevents data-race compiler errors caused by implicit background offloading of async work, especially around MainActor-isolated state and protocol conformances.

Core Features & Use Cases

  • Single-threaded by default: keeps async execution on the calling actor to reduce accidental threading hazards.
  • Isolated conformances: enables MainActor types to conform to non-isolated protocols safely under Swift 6.2 rules.
  • Explicit parallelism with @concurrent: moves CPU-intensive work to background threads only when you intentionally opt in.
  • MainActor default inference mode: reduces boilerplate by inferring isolation for app targets.
  • Migration-focused patterns: supports stepwise adoption when upgrading from Swift 5.x or earlier 6.x.

Quick Start

Enable Swift 6.2 Approachable Concurrency settings in your Xcode build and migrate your MainActor-heavy code to rely on actor-isolated async execution, using @concurrent only for explicitly parallel CPU work.

Frequently Asked Questions about swift-concurrency-6-2

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How does Swift 6.2 approachable concurrency prevent data races in MainActor-centric apps?▼

Swift 6.2 approachable concurrency prevents data races by keeping async execution on the calling actor by default, eliminating accidental threading hazards from implicit background offloading of MainActor-isolated state.

How do I migrate MainActor types to conform to non-isolated protocols in Swift 6.2?▼

You can migrate MainActor types to safely conform to non-isolated protocols in Swift 6.2 by using isolated conformances, which specifically address data-race compiler errors during the stepwise adoption process.

When should I use @concurrent for CPU-intensive async workflows in Swift?▼

Use the @concurrent attribute in Swift when you need to intentionally move CPU-intensive async workflows to background threads for explicit parallelism, as approachable concurrency keeps async work on the calling actor by default.

Does Swift 6.2 approachable concurrency require enabling specific build settings for MainActor inference?▼

Yes, adopting approachable concurrency requires enabling Swift 6.2 build settings including MainActor default inference mode, which reduces boilerplate by automatically inferring isolation for app targets.

What are the limitations of keeping async execution single-threaded by default in Swift 6.2?▼

Keeping async execution single-threaded by default limits automatic parallelism for CPU-intensive tasks, requiring explicit opt-in via @concurrent to offload hot paths and achieve background thread parallelism.

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