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Phase 1: Product Definition
Define the AI use case in one sentence
Identify what model (GPT-4o, Claude, Gemini) fits the use case
Define input → output schema
Estimate token cost per request
Set acceptable latency budget (< 3s? < 10s?)
Define what a "good output" looks like
Write 10 golden test cases (input → expected output)
Phase 2: Prompt Engineering
Write system prompt v1
Test with 10+ edge cases
Add output format instructions (JSON, markdown, plain text)
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