Diagnostics (Rank 1) Edit
At a glance, the Glass Walker can tell what is wrong with a machine. He can then enlist the aid of the machine's spirit in repairing the faulty device. Any technological spirit can teach this Gift.
The player rolls Perception + Crafts to determine the problem. She then spends one Gnosis point as the Garou mentally convinces the spirit of the device to aid her in fixing it. (Most such spirits are happy to do so — they don't want to be junk!) The time to fix the device is halved, and the player may subtract any successes on the Perception + Crafts roll from the successes necessary to fix the device.
Source: 3rd ed WWtA Corebook