Your question is SDK Requirements Then Build. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Give 5-7 requirements for an SDK that wraps an API, then build those requirements, tests, and documentation, fully working.
Choose a representative API surface and state any assumptions before implementing. Your solution should demonstrate production-quality error handling, request validation, authentication, retries, testability, and clear documentation without hiding important behavior behind abstractions.