In your game description, just put you used some code from your previous Trijams.
On using pre-made assets: make sure you have the necessary rights to the assets you use in your game. Be aware that using assets that you yourself (or your team-member) didn't create during the jam time may affect your game's rating. Clearly state all pre-made assets you used on your game's itch.io page and link to where they originated from.
Thanks for the reply! And that could be the way to go, although not sure if that portion is interpreted in that way for code as well, since I don’t normally consider code to be an asset (I interpreted that rule to seem more related to art, music, etc. and interpreted it as being that all raw code needed to be completely new every time).
Either way, always better to be on the transparent side! Although if that’s the case then probably worth just rewriting the tool code brand new for each jam to not get a lower rating even though it’s identical each time lol
