I understand rituals are meant to be rather obscure and hard to gather information about, but we are legendary tier adventurers over here, experienced in identifying magics in stressful and hostile environment. We should be able to know what these rituals do.
Now, personally, I feel like you should have a full on spell description for each ritual. If you know how to work the thing, you should know what it does, at least roughly.
That said, what would make a LOT of sense, but still maintain the mystery of rituals is if the effects of the ritual you just performed were explicitly revealed to you, whether it were nothing or whatnot. I mean any mage that's doing this sort of ritual should have the spells to analyze the results, so it's not like there's a lore reason not to.
