write-swift

Contains Shell Commands This skill contains shell command directives ( !command ) that may execute system commands. Review carefully before installing. Write Swift How to write Swift the way the language wants to be written, current through Swift 6.4. Toolchain baseline: Swift 6.3 (current release as of August 2026). Everything here compiles on 6.3 unless marked ⚠, which flags unreleased Swift 6.4 features. Concurrency guidance assumes the Swift 6.2 model — if the project is on 6.1 or earlier, §3's rules about async and @concurrent do not apply. The through-line: Swift is a progressive-disclosure language. Start with the simplest, most static, most single-threaded thing that works, and buy dynamism — concurrency, reference semantics, existentials, unsafe pointers — only where you can point at the reason. Every rule below is an application of that. Model this hierarchy of defaults. Move down a level only with a reason you can state: Need Reach for Move down only when Data struct / enum you need identity, sharing, or inheritance Abstraction concrete type you have repeated code across types Polymorphism some P (generic) you need heterogeneous storage → any P Execution main actor, synchronous profiling shows a hang → async → @concurrent → actor Memory Array , String profiling shows the cost → InlineArray , Span Safety safe API C interop or a measured hot path → Unsafe* Show more Installs 1.0K Repository emilkowalski/skills GitHub Stars 31.4K First Seen 1 day ago Security Audits Gen Agent Trust Hub Pass Socket Pass Snyk Pass