Dar Zeelon:
I'm unfamiliar with software that automatically checks tolerances of CNC work in the machine. Altho I'm not debating your statement, I wonder about the method of checking to be sure of the part being in tolerance because of tool wear, breakage etc. Of course, you can set up a schedule of changing tooling using wear rates, tolerance checks, etc. using info gleaned from past records. "Twitchy handed humans" are amateurs. You can't be a skilled craftsman and be "twitchy handed". Yes, mistakes happen, but far fewer than you suggest.
As Down Under notes, these kinds of things CAN be accomplished by us "mere humans" quite capably and productively. Please, Dar Zeelon, give us credit for being more than complete incompetents.
Sincerely, Jackster

Had to edit to correct a spelling error, [error]