Swift Concurrency Expert

Overview

Review and fix Swift Concurrency issues in Swift 6.2+ codebases by applying actor isolation, Sendable safety, and modern concurrency patterns with minimal behavior changes.

When to Use

• When the user asks to review Swift concurrency usage or fix compiler diagnostics.
• When you need guidance on actor isolation, Sendable, @MainActor, or async migration.

Workflow

1. Triage the issue

• Capture the exact compiler diagnostics and the offending symbol(s).
• Check project concurrency settings: Swift language version (6.2+), strict concurrency level, and whether approachable concurrency (default actor isolation / main-actor-by-default) is enabled.
• Identify the current actor context (@MainActor, actor, nonisolated) and whether a default actor isolation mode is enabled.
• Confirm whether the code is UI-bound or intended to run off the main actor.