This is fantastic, it's the right level for the structure that I'm interested in building. While langchain looks great, for my use case (generating templated code) I have a much stricter process and more branching than I can see it easily supporting (maybe it does? I can't quite figure it out). Marvin looks very nice.

Something I'd like to see in the docs and/or supported is caching, and setting details like temperature. I can wrap the ai_fns myself for caching though temperature would be very good.