If you start up a new agent and run visualize wm, the resulting SVG has a single white stroke in it (which is invisible on a white background). There might be something in the manual or help about the command not including top-level architectural WME's, but I think it would be more helpful if the output image would say explicitly something like "We didn't create a graph because we found no WMEs besides architectural ones (^io, ^smem, etc.). Try command again after some productions have fired."
If you start up a new agent and run
visualize wm, the resulting SVG has a single white stroke in it (which is invisible on a white background). There might be something in the manual or help about the command not including top-level architectural WME's, but I think it would be more helpful if the output image would say explicitly something like "We didn't create a graph because we found no WMEs besides architectural ones (^io, ^smem, etc.). Try command again after some productions have fired."