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concurrency

Enforces Swift 6 async/await, actors, and MainActor isolation across codebases.

Updated Jan 15, 2026
Search Tags:#concurrency#swift#async-await#actor#sendable#mainactor
One-click install
npx skills add https://github.com/vjr2005/Challenge --skill concurrency-vjr2005
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: concurrency
Source: https://github.com/vjr2005/Challenge/tree/main/.claude/skills/concurrency
Command: npx skills add https://github.com/vjr2005/Challenge --skill concurrency-vjr2005

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Swift concurrency can be complex and error-prone when scaling apps; this skill guides teams to adopt Swift 6 concurrency patterns (async/await, actors, and MainActor isolation) to improve safety, correctness, and performance.

Core Features & Use Cases

  • Automatic Sendable inference reduces boilerplate and prevents threading errors.
  • Default MainActor isolation for most types, with opt-out via nonisolated for actors and certain UI tests.
  • Guidance on using actors for shared mutable state and enforcing async/await usage across layers.
  • Prohibitions of legacy patterns like DispatchQueue, ObservableObject/Combine in favor of modern concurrency.

Quick Start

Configure default MainActor isolation and enable automatic Sendable inference to begin writing safe concurrent code.

Frequently Asked Questions about concurrency

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

FAQPage Schema
How do I use Swift 6 concurrency patterns to fix threading errors in my app?▼

Swift 6 concurrency eliminates threading errors by applying automatic Sendable inference and default MainActor isolation across your codebase to ensure safe asynchronous execution without legacy threading boilerplate.

What's the best way to migrate from DispatchQueue and Combine to modern Swift async/await?▼

Migrating to Swift async/await requires prohibiting legacy patterns like DispatchQueue and Combine, then enforcing actors for shared mutable state and default MainActor isolation across UI, domain, and data layers.

When do I need to use actors for shared mutable state in Swift?▼

Actors are needed for shared mutable state in Swift 6 to safely coordinate concurrent access, replacing legacy synchronization mechanisms with built-in isolation and async/await integration.

Does Swift 6 require explicit Sendable conformance for concurrent code?▼

Swift 6 does not require explicit Sendable conformance because it features automatic Sendable inference, which reduces boilerplate and prevents threading errors across asynchronous boundaries.

Can I opt out of MainActor isolation for specific types or UI tests in Swift?▼

You can opt out of default MainActor isolation using the nonisolated keyword for specific actors and certain UI tests, ensuring flexible concurrency boundaries without losing overall safety.

Why should I enforce async/await usage across all layers of my Swift app?▼

Enforcing async/await across UI, domain, and data layers improves reliability and correctness by scaling asynchronous execution safely, avoiding complex threading bugs inherent in legacy patterns.

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