Nikky mentioned this in the Discord, and I think it would be a good idea to have an API that does a general information dump of a target ItemStack, BlockState, Mob, or anything else that can have some sort of information with it. While it originally came up due to all the WAILA mods popping up, having a way to get an information dump should be general-purpose enough that a variety of mods could make use of it.

Personally I think this is out of scope for Fabric because not only is this not critical, but I think very few mods would actually display/use this information usefully.

I definitely agree that this out of scope. If you wanna adapt a pre-existing mod that does this, I recommend ProbeDataProvider. It's for 1.12 right now and is the driving system behind FruitPhone, my personal favorite WAILA-like.

i suggest doing this in your library code.

i also would suggest making this in a separate library rather than in fabricAPI
and i like ProbeDataProvider .. so adapting that would save a lot of api design work
there were attempts to port it to Rift at least

I'm keen on making ProbeDataProvider a Fabric-approved project, but this doesn't belong in API.