Tool device and machine tool

Machine tool, comprising:

• at least one tool carrier which comprises at least one interface for fluid and on which a tool device is held;
• wherein the at least one interface for fluid of the at least one tool carrier is in fluid connection with the at least one interface for fluid of the tool device;
• and
• wherein the tool device comprises:
• at least one interface for fluid;
• at least one piston device having a first piston face in fluid connection with the at least one interface for fluid and a second piston face opposite the first piston face;
• a return motion device which acts upon the first piston face;
• and
• a workpiece machining device coupled to the at least one piston device;
• wherein the at least one piston device is movable and positionable by force-biasing via the fluid.