AI Feature Design Prompt

Help me design an AI feature for my product.

Product: [describe what your product does]
Feature idea: [describe what you want the AI to do]
User: [who will interact with this feature and when?]
Input: [what data or text will the AI receive?]
Desired output: [what should it produce?]
Constraints: [latency requirements, cost per call budget, privacy concerns]

Please help me think through:
1. Whether this feature makes sense to build with AI (vs rule-based logic)
2. Which AI approach is most appropriate (LLM, classification, extraction, generation)
3. What the core prompt or system prompt should contain
4. Key failure modes and how to handle them gracefully
5. How to evaluate whether it's working (what does 'good' look like?)
6. The simplest version to build first