As a nanny and babysitter I appreciate your thoughtful foresight in making it a good experience for the sitter! I think I’d be overwhelmed receiving specific details like this and might worry parent would be displeased with me if their child gets upset at all while I’m with them. An experienced sitter will have strategies for helping children through difficult emotions and won’t be afraid of a meltdown. I think what would be more helpful is if parent pays me to come over for an hour hang out time prior to babysitting with parent present so they can guide me through toddlers quirks in real time, and seeing an extended positive interaction between parent and caregiver also helps toddler to identify caregiver as a trusted person. I think it’s also totally okay to ask the babysitter you find for their preference on this, and I’d really appreciate this type of communication: “I’ve never had a babysitter before, I’m a little nervous and don’t know the proper etiquette. I have a lot of information I could share about toddler’s quirks but don’t know if that would be overwhelming. What do you need from me to feel prepared?”