I love this article linked below and I will happily summarize it as briefly as I can. Avoid using the word “shall” in your drafting.
I can’t even count how many times I’ve had to sit through arguments about what “shall” means. Half of the world seems to think it is permissive and the other half of the world believes it is mandatory. Depending on the circumstances, either might be right. My bottom line drafting tip on this topic is, if you mean may, use may; if you mean must, use must! Save everybody an argument down the road.
https://www.mnbar.org/resources/publications/bench-bar/2022/06/30/the-uses-and-misuses-of-shall