Bootstrap, develop, and design modern WinUI 3 desktop applications with C# and the Windows App SDK using official Microsoft guidance, WinUI Gallery patterns, Windows App SDK samples, and CommunityToolkit components.
Install
npx skills add openai/skills --skill winui-appnpx skills add openai/skills --skill winui-app -a claude-code -gnpx skills add openai/skills --skill winui-app -a codex -ggemini skills install https://github.com/openai/skills.git --path skills/.curated/winui-appgh skill install openai/skills winui-appgit clone --depth 1 https://github.com/openai/skills /tmp/openai__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/openai__skills/skills/.curated/winui-app ~/.claude/skills/winui-app # Claude Code
cp -R /tmp/openai__skills/skills/.curated/winui-app ~/.agents/skills/winui-app # Codex, Cursor, Gemini CLI, Copilot, OpenCode