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The three-part prompt: role, goal, constraints

If you only learn one prompt structure, learn this one. It turns vague requests into focused ones, and it works in every AI tool.

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Issue
Level
Beginner
Time to apply
2 min

A strong prompt answers three questions: who the AI should be, what you're trying to achieve, and what limits it should respect.

The structure

  • Role: "You are an experienced [JOB] who [RELEVANT EXPERIENCE]."
  • Goal: "I need [OUTPUT] so that [WHY IT MATTERS / WHO IT'S FOR]."
  • Constraints: length, tone, format, things to avoid, and what you already tried.

Why "so that" matters

The purpose clause is the most skipped and the most valuable part. "A product description *so that* busy parents can decide in 10 seconds" produces a completely different result than "a product description".

Copy-ready prompt

Role, goal, constraints
You are a [ROLE] with [EXPERIENCE]. I need [OUTPUT] so that [PURPOSE / AUDIENCE]. Constraints: [LENGTH], [TONE], [FORMAT]. Avoid [THINGS TO AVOID].
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