Here is a full explanation of coinage: https://ck3mod.com/mints-coinage/

Direct link to requirements: https://ck3mod.com/mints-coinage/#coin-types

Thanks for answering and making the mod, now I feel kinda stupid tbh lol. Is there any reason these requirements don't show up ingame?

Yours is a perfectly valid question. You are not the first one to ask it.

I guess it doesn't show the tooltip because this kind of post-decision window (generally used for things like barony selection in Holy Orders) won't show automated tooltips from the "is_valid" chunk when conditions are not met - as is usual in other parts. I'd need to manually add a tooltip with requirements.

Sorry about necroing the discussion but I think the question is worth it. When I form Rome as the Byzantines, I get the same result, as in my coinage options get shrunk, despite logically it would make sense for the Roman Empire title to be equal to the Byzantines from coins perspective. So I was wondering if it'd be possible maybe add the Roman Empire title as one of the triggers, like the Byzantines. Sorry if I'm assuming too much.

@fangwolf4.- Yep the Roman Empire should be able to do that (and other activities/decisions like the Byzantine Empire). Thanks!
I'll fix it in the next update.