When you are dealing with a node in Marionette you have to supply an input. The node then does something to the input and the result is the output. If this node is part of a network, then the output will be carried to the next node. So you could use Marionette to make a rectangle then extrude it. If you want Marionette to make a rectangle, then you have to give it the correct inputs. If you want that rectangle to be extruded, then that also needs the correct inputs.