A building system of a building including one or more memory devices having instructions thereon, that, when executed by one or more processors, cause the one or more processors to receive a command to perform an action for an entity. The instructions cause the one or more processors to identify a service configured to perform the action based on a building graph, the building graph including a plurality of nodes and a plurality of edges, wherein the plurality of nodes represent entities of the building, the service, and one or more other services, wherein the plurality of edges represent relationships between the entities and communication actions of the service with the one or more other services and cause the service to perform the action by causing the service to perform one or more communication actions with the one or more other services indicated by the building graph.