@HbmMods How to conveniently add and modify the hbm's generated structures？I make a block which makes the process of exploring and generating buildings more interesting and challenging for players and I want to test whether it works well with the generated structure.

Are these tools useful for modifying or adding structures?

Those were meant for the structure component system which I don't know how it works since it was added via PR. You are free to make your own tools of course.

Structures are just lists of setBlock operations, there's no easy way of making larger modifications to those. As for adding new ones, there's probably a script for generating the code out of a schematic file, otherwise you'd have to do it by hand.