Individual skill

swift-concurrency

Guide for building, auditing, and refactoring Swift code using modern concurrency patterns (Swift 6+). This skill should be used when working with async/await, Tasks, actors, MainActor, Sendable types, isolation domains, or when migrating legacy callback/Combine code to structured concurrency. Covers Approachable Concurrency settings, isolated parameters, and common pitfalls.

skills/swift-concurrency/SKILL.md

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Repository stars (not skill ratings): 230
Repository last updated: Jan 14, 2026
License: MIT

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SKILL.mdcore · 7,850 bytes
references/common-mistakes.mddoc · 6,242 bytes
references/fundamentals.mddoc · 5,362 bytes
references/glossary.mddoc · 7,997 bytes
references/isolation.mddoc · 6,390 bytes
references/sendable.mddoc · 6,070 bytes

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# Swift Concurrency

## Overview

This skill provides guidance for writing thread-safe Swift code using modern concurrency patterns. It covers three main workflows: building new async code, auditing existing code for issues, and refactoring legacy patterns to Swift 6+.

**Core principle**: Isolation is inherited by default. With Approachable Concurrency, code starts on MainActor and propagates through the program automatically. Opt out explicitly when needed.

## Workflow Decision Tree

```
What are you doing?
│
├─► BUILDING new async code