After realizing that these shorts had very little to do with the main story line of the Grisha series, I decided to read the rest of them.
The Too-Clever Fox, like The Witch of Duva, is a fairy tale set in the same world as the main series. (Alina even mentions the story in [b:Siege and Storm|14061955|Siege and Storm (The Grisha, #2)|Leigh Bardugo|https://d.gr-assets.com/books/1362166252s/14061955.jpg|19699752], comparing another character to the fox in the story.)
I liked this short better than Witch of Duva, although both of them were really fun to read. The Witch of Duva had fairy tale elements, but it was more of a cautionary tale, where Too-Clever Fox reads like a standard fable - you even have your witty fox trying to think his way out of a problem.
It's also hard to go wrong with stories about talking foxes, for me.