Inspect a running WinUI 3 app's XAML with winapp devtools: resolved property values (margin, size, style), what a binding yields or why it's empty, the XAML line behind an element, live edits, and UI review comments left in the app. To click, type, read text or screenshot, use winapp-ui-automation.
Install
npx skills add microsoft/winappCli --skill winui-devtoolsnpx skills add microsoft/winappCli --skill winui-devtools -a claude-code -gnpx skills add microsoft/winappCli --skill winui-devtools -a codex -ggemini skills install https://github.com/microsoft/winappCli.git --path plugins/winapp/skills/winui-devtoolsgh skill install microsoft/winappCli winui-devtoolsgit 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/winui-devtools ~/.claude/skills/winui-devtools # Claude Code
cp -R /tmp/microsoft__winappCli/plugins/winapp/skills/winui-devtools ~/.agents/skills/winui-devtools # Codex, Cursor, Gemini CLI, Copilot, OpenCode