In my PhD thesis, I wish to describe a software toolbox that I created in equal parts along with 2 other people (say Alice and Bob).
Should I say
"This software toolbox was co-created with Alice and Bob?" or "This software toolbox was co-created by Alice and Bob?"
Since it is my Phd thesis, it is implicit that I am a creator. In fact, the university requires a covering statement that everything I say in the thesis is entirely my contribution, unless explicitly stated otherwise, properly acknowledged and appropriately referenced.
If it matters, this is in England, and although I am from India, I am not considered a native speaker by my institution.