I would like to see this as well, for all tools in the auction house. I can't see a way to determine if the tool you are looking at it is at full uses, partial, empty or broken.
There is a valid place on the auction house for all levels of tools, but I think it creates a hostile trading environment when you can't see what the auctioneer is actually selling.. i.e. that crappy so-and-so sold me a broken tool! grrrr.. but the crappy so-and-so was likely thinking they were helping out the poor soul that needed a broken tool for the Tinker skill..
Devs - Please add a level meter to the description of tools on the auction house. Thank you!!
I agree with this suggestion, and think in general there should be an "examine" on items on auction, that will tell you things like whether it's a regular or imbued teleport script, who wrote a note, how many uses are left in that jar of shrine powder.
Considering I think I just bought 3 broken tinkertools for $600 because I'm kind of in the middle of something and don't want to leave, yes. Please do this.