Eli5: what is a tool assisted speedrun?

Question

I kinda understand that tool might be something that automates some things during the speedrun but what I never got is to what extent it is meant that things are automated. Further, if some parts are, but we don’t know which are and which are not, how can we even assess the difficulty on the player’s behalf?

In: Technology

Answer 1

My son is a team lead in qa. He did a resi 4 t.a.s.  he said it’s a frame by frame perfect run.