Sounds quite a lot like the Common Lisp experience when using Sly and Emacs. You can (trace) every function and see lexical scopes of variables, even bind them if you execute some s-expr that does not currently have some variable under that symbol.

The distributed aspect is a bit more difficult though. I don't know if there is a system that truly got this right. Maybe Erlang's BEAM VM together with a good debugger I don't yet know about.