Unless you're working with magnetic compasses, magnetometers,
flux gate compasses, CRT's, or magnetic field measuring equipment,
I don't see much danger or risk from magnetized tools. However, if
you're playing with the powerful magnets found inside most hard disk
drives, methinks you should probably exercise some concientious
care in keeping them away from any magnetic storage material.
A "keeper" is usually sufficient (such as my steel desk).

I still wouldn't bring a magnetized tool near an analog tape recorder's play
head. However... as you'd demagnetize the head "as a matter of course" after
servicing the recorder, it probably doesn't matter.