Workshop Witches are 1 of the 2 major types of witches in the world, the other are the Tower Witches.

They try to protect the world.

They go to cities where a lot of people gather and build a workshop there and keep watch to make sure no one is using magic for evil purposes

There are established workshops in every major city.

From there they do all their monitoring.

Those are their witchly duties or workshop works

They are normal civilians otherwise..