uNodeRuntime is a graph that can be run in runtime without generating c# script and its more easier to debug and its support live editing but it can’t be referenced by the other graphs.
Creating uNodeRuntime
New uNodeRuntime can be created easily, simply select any game object and click Add Component button in the inspector and navigate to uNode and select uNodeRuntime.
Or click ‘Create’ in project and navigate to ‘uNode > Runtime’