swift-concurrency-pro

The swift-concurrency-pro skill is designed to review Swift code with a focus on concurrency correctness, modern async/await API usage, and prevention of common concurrency-related pitfalls. It helps developers identify subtle issues in asynchronous Swift code that may lead to race conditions, actor isolation problems, incorrect task usage, or improper cancellation handling. By targeting Swift 6.2 and strict concurrency checking, it ensures code aligns with the latest language safety guarantees and best practices in structured concurrency.

This skill performs a systematic review process that prioritizes known risk areas and follows a structured set of reference-based checks, including actors, structured concurrency, cancellation, async streams, bridging between synchronous and asynchronous contexts, legacy interop patterns, and diagnostic mappings. It emphasizes structured concurrency over unstructured Task usage, prefers async/await over closure-based APIs, and ensures safe actor isolation and reentrancy handling. It also produces actionable findings organized by file, including line-level issues, rule violations, and before/after code fixes, followed by a prioritized summary of improvements.

It is intended for Swift developers, code reviewers, and engineering teams working with modern concurrency systems or migrating legacy asynchronous codebases to Swift 6.2+. It is especially useful in large projects where concurrency correctness is critical, such as networking layers, data processing pipelines, and test environments involving async execution. The skill helps ensure safer, more predictable concurrency behavior while maintaining adherence to modern Swift concurrency conventions.