Depends on the tool. For most stuff, we have 2 other guys in the shop (20 year experienced tech and barely a lube tech), plus the manager (who has his own box) so the basics are all covered. If it's something like a very large metric wrench, or a vacuum bleeder, sure no problem.
I expect it brought back promptly, in the same condition I lent it out. I got in a bit of an argument recently about properly wrapping my extension cords. If you're not going to wrap it up in a somewhat neat manor (doesn't need to be perfect) then you can't use it.
Something else that's saved me, especially from loaning things people should ALL have is a "my tool, my job" policy. (8 piece axle nut socket set - $80. Don't cry to me about the cost of a 29mm 12 point axle nut socket). I have the only one, thus, any job that requires removing a toyota axle nut, is now mine. Thanks for the gravy ticket, friend.
If you're in a jam and need it, sure. But the lube tech ain't gonna be doing 4 hour axle swaps using my socket, while I knock out LOFs since he's "busy" sucking at his job. Actually had to lay down the law recently about the torque wrenches. 25 ft/lbs is the minimum, not 27, yes, there is a difference. The wrench leaves the box with the adjuster locked, and it is to return that way. Any tool that has a directional lever, is to be returned in the "loosen" position, as I always keep them as such.
Borrowing works for a while, if you need it a lot, buy it. Having your own is ALWAYS faster than borrowing. Good tools don't have to be expensive. Spending 20 min online can literally save you thousands upon thousands per year.