A surgical instrument, a spacer sleeve for a surgical instrument, and a tool for a surgical instrument. The surgical instrument includes the sleeve, which is designed to receive a part of the tool. The sleeve has signal lines that extend axially along the sleeve. A magnetic memory output device is arranged on the sleeve and is electrically connected to the signal lines. The magnetic memory output device outputs information about the tool based on information contained in a magnetic memory surrounding a circumference of the part of the tool. The magnetic memory output device also transfers information to an analysis unit via the signal lines of the sleeve.