Write and run automated UI tests for Windows desktop apps (WinUI 3, WPF, WinForms, Win32) with the winapp ui harness: one batch script, assertions, input, file pickers, dialogs, screenshots, locally or in Windows Sandbox. Use when asked for UI tests or to verify a feature end to end.
Install
npx skills add microsoft/winappCli --skill winui-ui-testingnpx skills add microsoft/winappCli --skill winui-ui-testing -a claude-code -gnpx skills add microsoft/winappCli --skill winui-ui-testing -a codex -ggemini skills install https://github.com/microsoft/winappCli.git --path plugins/winui/agent-plugin/skills/winui-ui-testinggh skill install microsoft/winappCli winui-ui-testinggit clone --depth 1 https://github.com/microsoft/winappCli /tmp/microsoft__winappCli
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/microsoft__winappCli/plugins/winui/agent-plugin/skills/winui-ui-testing ~/.claude/skills/winui-ui-testing # Claude Code
cp -R /tmp/microsoft__winappCli/plugins/winui/agent-plugin/skills/winui-ui-testing ~/.agents/skills/winui-ui-testing # Codex, Cursor, Gemini CLI, Copilot, OpenCode