How would you answer an interview scenario involving Prompt design for LLM applications?

For an interview scenario involving Prompt design for LLM applications, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Prompt design defines the instructions, context, examples, output format, and constraints given to a language model. In this scenario, given an extraction prompt that returns inconsistent JSON, explain how you would redesign the prompt and validate the response. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.