Tuhi, your storage assistant · What Tuhi knows
Does Tuhi use my Mac's real storage numbers or guess?
Short answer: Tuhi uses your Mac's real numbers, read from the same figures the Home screen shows, and never guesses. Each answer is checked sentence by sentence and anything it can't back up is left out.
Tuhi uses your Mac's real numbers and never guesses them. Free space, the biggest space-users, and how much has been moved or freed are read from the very same figures shown on the Home screen, so an answer never disagrees with what you can see.
When Apple Intelligence writes the wording of an answer, Storage Studio checks it sentence by sentence against what it really knows, and leaves out anything it can't back up — including any size or percentage about your Mac it wasn't given. If Tuhi hasn't finished reading your storage yet, it says so — "I'm still reading your storage — give me a moment, then ask again" — rather than inventing a figure. See why Tuhi sometimes says "I don't know".