How to write an agency brief: 5 essentials for faster, smarter creative

Having worked on both client-side and agency-side I can see and appreciate things from both sides of the fence. Now that I work agency-side I can see where I was going wrong in my marketing roles on client-side and what I was doing right in order to get the best out of my agency. In this three-part blog series I want to explore key ‘good practice’ methods. First on the agenda: briefing.

A strong agency brief speeds things up. It sharpens your focus. Reduces back and forth. Most importantly, it’s a guiding north star that ensures your investment delivers the commercial results your business needs.

Now in my role at Michon, I work with clients who wear multiple hats, have to run lean teams and need to deliver everything yesterday. So we know what makes a good brief… and what doesn’t.

Here’s how to make yours work harder.

Why briefing well matters

Your agency should bring fresh thinking, challenge assumptions and deliver measurable results. But that’s difficult to do without clear direction.

Taking the time to write a proper brief for your creative agency is undoubtedly time well spent. You might be up to your neck in paperwork with deadlines coming out of your ears but, in the longer term, the time you invest in giving the best brief you can, will pay dividends.

An effective brief gives your agency enough of the right detail to run at pace, act confidently and deliver work that hits the mark first time with zero handholding required. Ultimately, a well written brief generally results in a more efficient and therefore cost effective outcome for ALL parties, as the agency. Guesswork and misinterpretation only add time to a job. And as most agencies charge by the hour, neither side wishes to waste budget on it.

As one of our clients recently put it:

“I don’t have time to explain everything twice.”

If that feels familiar, it’s time to rethink your briefing approach.

The five must-haves in every effective brief

We’ve simplified the process to five essential questions. Answer these clearly, and you’ll get sharper strategy and smarter creative delivered more quickly.

1. What are we solving?

Start with the problem, not the execution. Is sales growth stalling? Are you launching a new service? Is the brand underperforming in a key market? Give your agency the business context and explain what needs to change as a result of the work.

Focus on what you want to achieve, rather than what you expect the finished creative to look like. Arriving with a predetermined solution can close down more effective possibilities before they’ve been explored. A clear outcome gives your agency the freedom to find the strongest way of reaching it.

2. Who’s the audience?

Get very specific. Internal or external? New prospects or loyal advocates? CFOs or frontline teams? Understanding what makes them tick is how your agency can create messaging that moves them.

3. What does success look like?

Is this about driving sales, changing perception, or getting internal buy-in?

Your agency works best when they know what you’ll be measuring – whether that’s conversions, sign-ups, employee engagement or EBITDA uplift.

4. How will the creative be used?

Pitch decks, social reels, merchandise, POS—your creative may need to do more than one job. Tell your agency where it needs to work, how widely it will be seen and how long it needs to remain relevant. Be clear about the number of assets or variations required too.

Understanding the full scope from the outset allows your agency to build an idea that can flex effectively across every format, audience and stage of the campaign, rather than trying to retrofit it later.

5. Why now?

Is there a product launch around the corner? A shift in market dynamics? Or pressure from leadership to deliver results? Understanding timing helps to prioritise and plan – and spot opportunities to go deliver above and beyond expectations too.

With all of these prompts, the more detail the better. It might feel like information overload but a good agency will be able to digest it all and come back with ideas that are grounded in data and insight.

Common briefing traps to avoid – and how to solve them

Share the budget early

Transparency speeds things up.

A ballpark figure is better than nothing to go on at all. Knowing the level of investment available means your agency can tailor solutions that are commercially viable from the outset. It helps shape realistic recommendations, prioritise key deliverables and avoid wasted effort on routes that won’t land. Every budget, whether big or small, should be treated with the same commercial focus.

Define what’s fixed – and what’s flexible

Set smart parameters. Whether it’s a deadline that can’t shift, a platform that must be used or a stakeholder who needs convincing, make those non-negotiables clear upfront.

Far from restricting creativity, a tight brief almost always delivers better results. Clear parameters funnel ideas, focusing our creative superpower with laser precision on where it matters most. They challenge us to interrogate and distil our thinking, making the strongest ideas even stronger.

But a tight brief shouldn’t be an inflexible one. Flag where there’s room to manoeuvre too. Is the proposed execution open to challenge? Could the messaging evolve? Giving your agency space to think laterally allows them to identify opportunities and add value beyond what’s expected.

Build in time to debrief

Once the project’s complete, take stock. Did the work meet the brief? What performed well? What could be improved? That reflection drives improvement and better results.

A good debrief can turn a one-off projects into long-term growth. It builds trust with your agency, can improve future outputs and keeps everyone aligned on what success looks like next time.

Stay open and collaborative

Agility is a two-way street. Even the best brief won’t answer every question. Be open to feedback, discussion and refinement. A strategic agency partner won’t just take your brief at face value, they’ll stress-test it, ask tough questions and push for stronger outcomes.

Final thought

Great work starts with a great brief. More clarity up front means less ambiguity down the line, fewer delays and better creative that hits the mark first time.

Here, we see every brief as an opportunity to solve complex challenges and shape standout ideas that deliver measurable impact. The more insight and direction you can provide from the outset, the more we can bring to the table – quickly and strategically.

When it comes to briefing, you really do get out what you put in – and with the right agency on board, that effort pays off.