iOS Concurrency Router

You MUST use this skill for ANY concurrency, async/await, threading, or Swift 6 concurrency work.

When to Use

Use this router when:

• Writing async/await code
• Seeing concurrency errors (data races, actor isolation)
• Working with @MainActor
• Dealing with Sendable conformance
• Optimizing Swift performance
• Migrating to Swift 6 concurrency
• App freezes during loading (likely main thread blocking)

Conflict Resolution

ios-concurrency vs ios-performance: When app freezes or feels slow:

1. Try ios-concurrency FIRST — Main thread blocking is the #1 cause of UI freezes. Check for synchronous work on @MainActor before profiling.