How to write modern Swift well — 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 orrrrli/clawd-harness --skill write-swiftnpx skills add orrrrli/clawd-harness --skill write-swift -a claude-code -gnpx skills add orrrrli/clawd-harness --skill write-swift -a codex -ggemini skills install https://github.com/orrrrli/clawd-harness.git --path skills/engineering/write-swiftgh skill install orrrrli/clawd-harness write-swiftgit clone --depth 1 https://github.com/orrrrli/clawd-harness /tmp/orrrrli__clawd-harness
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/orrrrli__clawd-harness/skills/engineering/write-swift ~/.claude/skills/write-swift # Claude Code
cp -R /tmp/orrrrli__clawd-harness/skills/engineering/write-swift ~/.agents/skills/write-swift # Codex, Cursor, Gemini CLI, Copilot, OpenCode