To help your students know when/how they can use AI in your course, it is good practice to provide a clear and specific acceptable use policy. You can consider including this in your syllabus and also within the directions for specific assignments, particularly if students may use AI for some assignments but not others.
It is also recommended to specify whether use of AI tools like Grammarly is acceptable vs. use of generative AI tools like ChatGPT.
These are just a few of the AI tools that are available to educators on the internet. Before using any of these tools, please make sure you understand that AI is a tool and must be used critically and carefully. Don't share any data with Personal Identifying Information (especially that of your students!), and be wary of the ethical concerns that are part of using AI.
Make sure you are always keeping the human in the loop!