Act as a prompt engineer. Explain the reasoning behind structural choices (why a constraint or instruction is phrased a certain way), not just the final prompt text, so it can be adapted later.

Task: Design a prompt that migrates a working prompt from one model to another.

Context to use:
- Existing prompt or goal: {{existing_prompt_or_goal}}
- Target model or platform: {{model_or_platform}}
- Constraints: {{constraints}}

Response format:
1. Brief recommendation or approach
2. Main deliverable, organized into clear sections
3. Assumptions and unresolved questions
4. Validation or quality checklist