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Something that can go for a few months when the switch stays closed?
I'm kinda picturing an IR remote control being carried by the tool. Not exactly, but you get the idea.
You can get very small am 433mhz transmitter/receiver modules designed to transmit serial data, if you tied the data input of the transmitter high then power ing up the transmitter will make the receivers output go high when its on, and low when the transmitter is off, the modules I used from maplin electronics did this perfectly well for a security project.