I'm not familiar with this but it seems more geared towards visually representing flow charts but it doesn't have the necessary verbosity for visual scripting.

I'm not familiar with this but it seems more geared towards visually representing flow charts but it doesn't have the necessary verbosity for visual scripting. I might be wrong but I think this is only part of the puzzle. Can rules be defined such that, for example, a node port must be pointed to, or that a default value is available? Besides the declaration of a graph, there also needs to be a way to define semantics, ie something akin to a Language Server Protocol. That way tooling can enforce validity while editing a graph.