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swift-concurrency-macos

Develops data-race-free async Swift code for macOS apps with AppKit and XPC services.

1|Updated Jun 5, 2026
Search Tags:#appkit#sendable#macos development#swift concurrency#xpc services#strict concurrency#async swift
One-click install
npx skills add https://github.com/LaughingJackalope/macos-skills --skill swift-concurrency-macos
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-concurrency-macos
Source: https://github.com/LaughingJackalope/macos-skills/tree/main/swift-concurrency-macos
Command: npx skills add https://github.com/LaughingJackalope/macos-skills --skill swift-concurrency-macos

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Writing async Swift code for macOS that interacts with AppKit, XPC services, and background daemons often leads to data races, main thread crashes, and concurrency bugs when mixing legacy AppKit patterns with modern Swift concurrency. This Skill eliminates those risks by providing production-grade, macOS-specific concurrency patterns validated against Apple's latest documentation and WWDC sessions.

Core Features & Use Cases

  • Actor & Task Management: Implement thread-safe state with actors, structured task groups, and cooperative cancellation for parallel I/O and background work.
  • AppKit Bridging: Safely update UI from async contexts, handle legacy AppKit delegate callbacks, and avoid common main thread and run loop pitfalls.
  • XPC & Daemon Concurrency: Build async-safe XPC services and background launchd daemons without crashes or data races.
  • Use Case: A macOS document editor can use this Skill to safely process large files in parallel while updating the UI, and communicate with a privileged helper daemon via XPC without concurrency errors.

Quick Start

Use the swift-concurrency-macos skill to refactor your existing NSDocument subclass to use @MainActor isolation and add a parallel task group for batch thumbnail generation without data races.

Frequently Asked Questions about swift-concurrency-macos

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

FAQPage Schema
How do I write data-race-free async Swift code for macOS AppKit applications?▼

To write data-race-free async Swift code for macOS, use actor isolation and Sendable compliance to safely manage state across AppKit and background daemons. This ensures thread-safe UI updates and prevents concurrency bugs when migrating to Swift 6 strict concurrency.

What is the best way to bridge async Swift concurrency with legacy AppKit main thread updates?▼

The best way to bridge async Swift concurrency with AppKit is using @MainActor isolation. This pattern safely updates UI state from async contexts and handles legacy delegate callbacks without blocking the main run loop or causing thread crashes.

Can I use Swift structured task groups for parallel file I/O in macOS document editors?▼

Yes, you can use Swift structured task groups with cooperative cancellation for parallel file I/O in macOS document editors. This pattern processes large files concurrently while safely updating the UI without data races or deadlocks.

How do you build async-safe XPC services and launchd daemons in Swift?▼

Building async-safe XPC services and launchd daemons in Swift requires applying strict concurrency patterns to inter-process communication. This prevents crashes and data races when communicating with privileged helper daemons from background tasks.

Why does my macOS app crash when mixing legacy AppKit patterns with Swift 6 strict concurrency?▼

Your macOS app crashes because mixing legacy AppKit patterns with Swift 6 strict concurrency causes data races and main thread violations. Refactoring to use actor isolation and Sendable compliance eliminates these runtime concurrency bugs.

Do I need strict concurrency enabled to use async Swift patterns for macOS 26+ development?▼

For macOS 26+ development, enabling Swift 6 strict concurrency is recommended to validate your async patterns against data races. It ensures your AppKit bridging, XPC services, and background daemons are race-free and deadlock-safe.

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