That looks like another full-scale ERD generator, with much more detailed structural information too. Those make useful references, but what I'm trying to reach is a way of understanding parts of a relationship graph better and more quickly by navigating it from the inside with the terminal as a REPL of sorts (or, if you like, a very limited "parser" as in interactive fiction or a MUD) instead of the holistic and potentially overwhelming birds-eye view of an ERD.