I have designed and programmed an AI system for one of my previous games. It’s not that robust, but it would fit my game idea nicely. Am I allowed to use it or should I code one from scratch for the jam?
According to the rules page: https://itch.io/jam/scream-jam-2025
(( Can I use code or assets I worked on before the Jam Started...))
Planning before the jam is fine, and you are welcome to reuse some assets and code from previous projects, but it is something you should limit.
In the spirit of participating in a game jam, you should keep most of your development during the jam period to get the most out of it!