How to write modern Swift well â modeling with value types, Swift 6 data-race safety and approachable concurrency (@concurrent, main-actor-by-default, actors, task groups), protocols and generics (some vs any), API design, performance and ARC, Swift Testing, macros, and the modern language features agents don't know about yet.
Install
npx skills add emilkowalski/skills --skill write-swiftnpx skills add emilkowalski/skills --skill write-swift -a claude-code -gnpx skills add emilkowalski/skills --skill write-swift -a codex -ggemini skills install https://github.com/emilkowalski/skills.git --path skills/write-swiftgh skill install emilkowalski/skills write-swiftgit clone --depth 1 https://github.com/emilkowalski/skills /tmp/emilkowalski__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/emilkowalski__skills/skills/write-swift ~/.claude/skills/write-swift # Claude Code
cp -R /tmp/emilkowalski__skills/skills/write-swift ~/.agents/skills/write-swift # Codex, Cursor, Gemini CLI, Copilot, OpenCode