Well, it's not just tools. Its also all the parts and plates and what not that you need to make sure don't get away.Maybe one could have a tarp to catch tools, the entire big floating frame seems too clumsy, however.
I can see an open frame dock with a netting that just help prevent something important from drifting away. Imagine after several years or decades of orbital manufacture how many bolts, screws, and nut are in some random orbit with anything else. So, I can see there being motivation to help ensure a "clean" work site while working, uh, "out of doors", so to speak.
But that doesn't mean it needs to be as big or as rigid as the Star Trek thing. It can be something akin to an EZ Up that's just emplace over the work site for the duration of the work, at least for repairs.
For manufacture, where you have a 100 space welders blazing away with pocket fusion lances all over the hull, maybe something larger makes more sense.