Foundryside by Robert Jackson Bennett. Our protagonist thief accidentally steals a talking key, but I don’t want to spoil too much. Plus it’s been a while so I don’t remember a lot of details. I liked how the magic was like logical programming. How do you make a carriage sitting on an even surface roll forward? Tell it that it’s now on an incline.
Edit: Oops. Flipped the author’s name
I was the same. I don’t use it enough to make the cost worth it, and I can wait a few extra days for free shipping. It usually ends up arriving faster than predicted anyway.