Something that occurred to me when thinking about #148. NBT-less tools are an issue that pops up from time-to-time when certain other mods interact with Gems. Lucky Cases for example, an issue which the mod author had no interest in fixing.
Idea is to randomize these tools of nothingness when they pop up. Could also be fun if you just want to 'give' yourself a random tool.
Not sure what the best place for that is, since it could be client- (JEI add-ons) or server-side (Lucky Cases). The onUpdate method should work for server-side. The client-side stuff may need something else, I'll look into it later.