All current tools/armor can only use one augment. Also the left slots won't be augment slots.

Originally posted by @BlakeBr0 in #267 (comment)

when will the update be? (1.18)

Awakened Supremium tools and armor added in version 6.0.0 can have 2 augments added. As far as the slots on the left, they were intended for adding essences to Staffs but I have put those on the backburner to prioritize adding other features instead.