GetActiveWindowInfoTool

get_active_window_info — return the foreground package plus the active window's root-node class (typically the foreground activity's view-root class). Cheap and read-only; safe to poll.

No params.

On success returns package_name (String?), root_class (String?), and window_id (Int). Returns the long-form notConnectedError message when the service is not bound, and no_active_window when it is bound but no active-window root is available (see rootUnavailableError).