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A great prompt is not magic. It's specification.

Click through a production-grade prompt, part by part, and see exactly what each COSTAR element contributes — and what silently breaks when you skip it.

More free playgrounds Join the free cohort

A real prompt — click any part

C

Context

Grounds the model in the situation. Without context, advice is generic — it can't weigh what matters (money movement, deploy frequency).

Without it: boilerplate code-review tips that ignore the stakes of a payments system.

Why COSTAR?

Context, Objective, Style, Tone, Audience, Response — six questions that turn “write me a code review” into a prompt a team can rely on. It is not magic words; it is specification. Our Prompt Craft Lab scores learners on exactly this, prompt by prompt.

What is the COSTAR prompt framework?

COSTAR structures a prompt into Context, Objective, Style, Tone, Audience and Response format — six explicit decisions that turn a vague request into a reliable specification.

Is prompt engineering still a real skill?

The magic-words era is over; the specification era is not. Engineers who can state context, objective and output contract precisely get consistently better results from any model.

How does miatz teach prompting?

In the Prompt Craft Lab, learners write prompts against real tasks and get scored on COSTAR and canonical technique, with an optimized rewrite and rationale every time.

Deeper dive: COSTAR, defined properly

Now lint it against a real model's official rules

Anatomy teaches what a well-formed prompt contains. Prompt X-Ray grades yours against the target model's own published guidelines — every finding with a receipt, free, no signup.

Open Prompt X-Ray Join free