The words in the brackets are telling the actors what to physically do, meaning it would be a stage direction.
It isn't dialogue because that is a conversation between two people.
It isn't dialect because that is how a person speaks. There is no speaking in the brackets.
It isn't narration because it isn't spoken allowed for the audience.
It isn't a description because that is too broad a term more often used for emotions.
For example, if you sign up for a credit card, you may think the bold print is good, but the small print may reveal that the interest rates are not what they need to be. Secondly, it could put you into a lot of debt if you click the I agree button, but you didn't know that they can lower your credit score, or even totally damage it.
Umm We can’t even see the questions nor answers?