I've seen this handled by making a team charter. It describes who you are and what you do in a couple paragraphs (no more than a page). Put it in front of uppe

I've seen this handled by making a team charter. It describes who you are and what you do in a couple paragraphs (no more than a page). Put it in front of upper management for comment/approval. Share it widely and keep it on hand when meeting with upper management or other teams. Expect it to be a living doc. Managing expectations is hard. Everyone will have different expectations of you unless you handle it for them.