The thrall would not craft but simply ensure your bench was fully stocked with materials so that when you go to craft you don’t spend extra time serching for what you need.
So long as you keep a tidy storage system this thrall will aid you not do it all for you.
The alternative is a hopper attachment to benches but that is a device that doesn’t belong in this fantastical era in my opinion. May as well use slaves for what they are meant for, doing the hard work and heavy lifting.
And before I get a social justice warrior in here up in arms about my last statement.
thrall
THrôl/
noun, literary
the state of being in someone’s power or having great power over someone.
“she was in thrall to her abusive husband”
-historical
a slave, servant, or captive.
plural noun: thralls