Decide the cheapest path to an AI capability — prompting, RAG, fine-tuning, or distillation — with the honest amortization math for each. Use this skill whenever the user asks "should we fine-tune", weighs prompt engineering against training a custom model, wants a capability at lower ongoing cost, or is designing a new AI feature and choosing its approach. Part of Lean Agentic AI Skills; emits lean-findings.json.
