What is Brief Prompting? The agency method for AI

Why better answers start with a brief

You ask ChatGPT or Claude for something. The answer is fine, generic and not quite yours. You tweak, retry, and eventually settle.

The problem usually isn't the model. It's the brief. Brief Prompting is a way to fix that, and this article explains what it is, why it works and how to do it.

Brief Prompting in one paragraph

Brief Prompting is the practice of briefing an AI the way a top agency briefs a creative. Before the creative starts, they get a clear brief: what we need, for whom, in what context, within which limits. Brief Prompting applies that discipline to AI, and gathers the information by interview rather than asking you to write a perfect prompt from a blank page. PromptDeck originated the term and built an app around it. See the Brief Prompting overview for the short version.

Why the agency analogy fits

Imagine handing a freelance copywriter a sticky note saying "write something about our new app." You would get questions back: who is it for? What's the tone? How long? What have we already said? What must we not say?

An AI doesn't ask. It guesses, and guesses average. A one-line prompt invites the most typical possible answer.

A good agency brief removes guesswork. It is also why strong creative work follows from it. The same logic transfers directly.

The nine parts of a brief

Brief Prompting uses nine elements:

You do not need all nine every time. A quick task might need four. A high-stakes one benefits from all nine.

Why interviews beat blank pages

Most people know a lot about what they want. They just don't know which details to write down.

A blank prompt box gives no hints. A question does. "Who is the audience?" is easy to answer; "write a comprehensive prompt" is not. Interviews turn recall into a series of small, easy decisions.

That is how PromptDeck works. It shows one question card at a time. You pick a depth:

• Quick: about 8 questions, for everyday tasks
• Standard: about 15 questions, for most work
• Deep: about 25 questions, for important or complex output

At the end it writes a single ready-to-paste prompt. For ChatGPT it uses markdown headings. For Claude it uses XML tags, which suit how Claude reads structured input. More on that in Claude XML prompting.

Before and after

A typical prompt:

Write a LinkedIn post about our new feature.

A briefed prompt:

# Role
You are a B2B social copywriter for a small SaaS company.

# Goal
Announce calendar sync and drive trial sign-ups.

# Audience
Operations managers at 10-50 person agencies. Sceptical of new tools.

# Context
Calendar sync was the most requested feature this year. It works with Google and Outlook.

# Constraints
Under 120 words. One link. No hashtags beyond two.

# Tone
Plain, confident, a little humorous.

# Format
Hook line, three short paragraphs, closing question.

# Avoid
"Excited to announce", emojis, buzzwords.

# Success criteria
Someone can say in one sentence what changed and why it matters.

The second takes a few minutes to produce by hand. By interview it takes about the same, with less effort and fewer omissions.

How to practise Brief Prompting by hand

You can use the method without any app. Try this:

1. State the goal in one sentence. If you can't, you aren't ready to prompt.
2. Name a real reader. "Marketing managers at mid-size B2B firms" beats "everyone."
3. Add context the AI can't know. Your product, history, past attempts.
4. List constraints. Length, format, reading level, banned words.
5. Describe tone with contrast. "Friendly but not chatty" is clearer than "friendly."
6. Include one example. Even a short sample steers style strongly.
7. Say what to avoid. Models respond well to explicit exclusions.
8. Define done. What would make you accept the first draft?

For the full method, read the Brief Prompting method guide.

Where examples come from

Examples are the part people skip most, because finding good ones takes effort. PromptDeck can search the web for real, published reference examples that fit your task, so your brief can point at what good looks like rather than at an abstraction.

When Brief Prompting helps most

• Writing that must sound like you or your brand
• Tasks with several constraints
• Work you will repeat or share with a team
• Anything where the first answer being wrong costs time

It helps least for trivial questions like "what's the capital of Peru." A brief for that is wasted effort.

How it relates to prompt engineering

Prompt engineering is the broader technical discipline, including techniques like few-shot examples, reasoning steps and testing. Brief Prompting is narrower and more accessible: it focuses on supplying the right information. The two overlap and complement each other. We compare them in prompt engineering vs Brief Prompting.

Try it

If you want to see Brief Prompting without setting it up yourself, try PromptDeck free. The first prompt is free. Pro is €9/month for 100 credits, or €79/year.

A brief still needs judgement

A strong brief reduces guesswork; it does not guarantee truth. Check factual claims, inspect sources and review the output before publishing. If you do not know an answer during the interview, say so rather than inventing a detail. An explicit unknown is more useful than a confident but false assumption.

FAQ

What is Brief Prompting in simple terms?

It's briefing an AI like an agency briefs a creative: you give goal, audience, context, constraints, tone, format, examples, what to avoid and success criteria, instead of a vague one-liner.

Who created Brief Prompting?

PromptDeck originated the term and the interview-based approach to gathering a brief.

Do I need a tool to use it?

No. You can write a brief by hand using the nine elements. A tool like PromptDeck speeds it up by asking the questions for you.

Does it work with both ChatGPT and Claude?

Yes. The method is model-agnostic. The finished prompt is usually formatted with markdown headings for ChatGPT and XML tags for Claude.

How long does a brief take?

By interview, a Quick session has about 8 questions and a Deep one about 25. Most people finish a Standard one in a few minutes.