I'm imagining a debug view that slows down the flow and shows data traveling through the graph, so you can see it at every step. Or with the circuit board meta

I'm imagining a debug view that slows down the flow and shows data traveling through the graph, so you can see it at every step. Or with the circuit board metaphor, a debug "probe" that would show the data (or a graph of data) traveling through that point. Different debugging tools will make sense in different domains, but we're considering the challenge.