Tuhi, your storage assistant · What Tuhi knows
What does Tuhi do if my disk is full right now?
Short answer: When your disk is short on room right now, Tuhi sends you to Emergency Space, which lists the safest options first — files apps rebuild themselves — and does nothing until you choose.
If your disk is short on room right now, Tuhi sends you to Emergency Space rather than the routine tidy-up. Emergency Space shows what's using the disk, with the safest options first — clearing files that apps rebuild by themselves before moving anything of yours — and nothing happens until you choose.
When space is merely getting tight, Tuhi suggests a regular Run Tuhi tidy-up instead. See Where your space went.