Arroyo can manage any number of NixOS hosts, though right now it seeks to only manage systems which are "endpoints" -- a place the user may want to deploy their Arroyo configuration to.
Server and cluster management will be explored at some point in the future, but for now this is designed to build laptops and desktops which can be given a bare-bones NixOS install through my NixOS Automatic Partitioning Installer and attached to the same network as a machine running Arroyo or capable of running Morph on a set of Arroyo tangled files.