Look up real Windows, WinRT, and Windows App SDK APIs (types, members, enums) from a project's references or the installed SDKs with winapp find-api instead of guessing. Use before coding against an unverified API, or to fix unknown-member, CS0117, CS1061, or WMC0011 errors. Not for registry code.
Install
npx skills add microsoft/winappCli --skill winapp-find-apinpx skills add microsoft/winappCli --skill winapp-find-api -a claude-code -gnpx skills add microsoft/winappCli --skill winapp-find-api -a codex -ggemini skills install https://github.com/microsoft/winappCli.git --path plugins/winapp/skills/winapp-find-apigh skill install microsoft/winappCli winapp-find-apigit clone --depth 1 https://github.com/microsoft/winappCli /tmp/microsoft__winappCli
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__winappCli/plugins/winapp/skills/winapp-find-api ~/.claude/skills/winapp-find-api # Claude Code
cp -R /tmp/microsoft__winappCli/plugins/winapp/skills/winapp-find-api ~/.agents/skills/winapp-find-api # Codex, Cursor, Gemini CLI, Copilot, OpenCode