Swift Stable

Use this skill as the language-semantic foundation. Respect the project's Swift tools version, supported platforms, strict-concurrency mode, and library-evolution contract.

Before changing code

1. Inspect Package.swift, Xcode project settings when present, CI, and compiler flags.
2. Record Swift tools/compiler version, platforms, target architectures, language mode, strict concurrency, and library evolution.
3. Compile the smallest affected target before diagnosing source semantics.
4. Load swift-package-manager for package topology and swift-concurrency for actor/task behavior.

Language rules