Tools are items you can buy with money to aid you in stealing from other players houses. Tools can be bought from the interface in the upper right of the backpack and sold back for half price by toggling on "Sell Mode" in the backpack.
All items are one-use only and perform a specific function. On the turn that the player uses an item, mobiles (ie. dogs, cats and family members) do not move, however electricity still cycles as per a normal move.