swift-concurrency

Guide Swift code authors through async/await, actors, and structured concurrency migrations.

1|Updated Feb 24, 2026

Search Tags:#migration #concurrency #swift #async-await #actor #sendable #mainactor

Ready to run

npx skills add https://github.com/kmshdev/claude-swift-toolkit --skill swift-concurrency-kmshdev

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Please help me install this Agent Skill.
Skill: swift-concurrency
Source: https://github.com/kmshdev/claude-swift-toolkit/tree/main/skills/swift-concurrency
Command: npx skills add https://github.com/kmshdev/claude-swift-toolkit --skill swift-concurrency-kmshdev

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Write, review, or fix Swift concurrency code using actors, async/await, and structured concurrency to mitigate data races, deadlocks, and complexity in modern Swift apps.

Core Features & Use Cases

Actor isolation and custom actors for safe shared state management across UI and background tasks.
Structured concurrency patterns (async/await, Task groups, cancellation) for scalable async workflows.
Migration guidance from GCD to Swift Concurrency and adoption of Swift 6.2 approachable concurrency and main-actor-by-default.
Guidance for code review and safety checks to reduce concurrency-related bugs in Phase-based development.

Quick Start

Load the swift-concurrency skill and start applying async/await patterns in your codebase.

Frequently Asked Questions about swift-concurrency

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

FAQPage Schema

How do I migrate from GCD to Swift Concurrency using async/await?▼

Migrate from GCD to Swift Concurrency by replacing dispatch queues with structured concurrency patterns, utilizing async/await, Task groups, and actors to manage background tasks safely. This migration reduces data races and deadlocks while adopting Swift 6.2 approachable concurrency patterns.

What is the best way to handle shared mutable state in Swift without data races?▼

Handle shared mutable state safely in Swift by using actor isolation and custom actors. Actors serialize access to their mutable state, preventing data races and deadlocks across UI code and background tasks without needing manual locking mechanisms.

How do I use @MainActor and Sendable types for background tasks in Swift?▼

Use @MainActor to confine UI updates to the main thread and Sendable types to safely pass data across concurrent tasks. This combination ensures safe concurrent execution and aligns with main-actor-by-default patterns in Swift 6.2.

How does structured concurrency handle Task cancellation in Swift?▼

Structured concurrency in Swift handles Task cancellation by propagating cancellation signals through Task groups and child tasks. You must check for cancellation within your async workflows to stop ongoing operations cleanly and avoid unnecessary background work.

Can I get code review guidance for Swift concurrency safety checks?▼

Yes, you can receive code review guidance for Swift concurrency safety checks. The approach focuses on reviewing async patterns, actor isolation, and Sendable conformance to reduce concurrency-related bugs during phase-based development.

Why does my Swift Concurrency migration cause Sendable conformance errors?▼

Swift Concurrency migration causes Sendable conformance errors when non-Sendable types cross actor isolation boundaries or concurrent contexts. You must ensure shared types conform to Sendable or use nonisolated functions to resolve these safety violations.