If a student asks how to solve an equation, ideally a harness needs to have a state/memory of learner's past understanding, provide hints, use tools like problems/simulations/assessments and end the session with an evaluation to establish mastery.
All AI tutors I see are LLM+Prompts but I think a harness is really the right form factor for this problem. I want to see what others think and if there's an appetite for this beyond the K12 market where adoption would be super slow.