guide-swift-concurrency

Analyze Swift concurrency code for correctness and strict concurrency diagnostics.

299|16|Updated Feb 19, 2026

Search Tags:#concurrency #swift #ios #code-review #async-await #actors #swift6

Ready to run

npx skills add https://github.com/Prisma-Labs-Dev/apple-skills --skill guide-swift-concurrency-prisma-labs-dev

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: guide-swift-concurrency
Source: https://github.com/Prisma-Labs-Dev/apple-skills/tree/main/skills/guide-swift-concurrency
Command: npx skills add https://github.com/Prisma-Labs-Dev/apple-skills --skill guide-swift-concurrency-prisma-labs-dev

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This skill addresses the complexity of modern Swift concurrency, helping developers avoid common pitfalls like actor reentrancy bugs, data races, and improper task management.

Core Features & Use Cases

Concurrency Review: Analyzes code for strict concurrency compliance, structured concurrency usage, and proper actor isolation.
Bug Prevention: Identifies dangerous patterns such as force-unwrapping actor state after suspension points or swallowing errors in unstructured tasks.
Migration Guidance: Provides clear paths for migrating legacy GCD and Combine code to modern async/await patterns.

Quick Start

Use the guide-swift-concurrency skill to review my current actor implementation for potential reentrancy bugs and data races.

Frequently Asked Questions about guide-swift-concurrency

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

FAQPage Schema

How do I find actor reentrancy bugs in my Swift concurrency code?▼

To find actor reentrancy bugs in Swift concurrency code, analyze your async-await implementations for dangerous patterns like force-unwrapping isolated state after suspension points. This identifies potential data races and ensures thread safety under Swift 6.2 standards.

What is the best way to migrate legacy GCD code to modern Swift concurrency?▼

The best way to migrate legacy GCD code to modern Swift concurrency is to transition to structured concurrency patterns and async-await APIs. This eliminates unstructured task swallowing and provides clear migration paths for legacy GCD and Combine codebases.

Does this Swift 6 strict concurrency analysis detect improper task cancellation handling?▼

Yes, Swift 6 strict concurrency analysis detects improper task cancellation handling by reviewing structured concurrency patterns. It validates that unstructured tasks properly propagate errors and handle cancellation correctly to prevent silent failures.

How do I check my iOS app for strict concurrency compliance and data races?▼

To check your iOS app for strict concurrency compliance and data races, validate your code against Swift 6.2 diagnostics. This reviews actor isolation boundaries and structured concurrency usage to eliminate data races and ensure thread safety.

Why does force-unwrapping actor state cause data races after an await suspension point?▼

Force-unwrapping actor state causes data races after an await suspension point because actor isolation is temporarily lifted during execution. Analyzing Swift concurrency code identifies these dangerous reentrancy issues to prevent unexpected state mutations.