In the world of marketing, advertising, creative & media, the brief has been the load-bearing wall of the discipline for as long as any of us can remember. Strategy briefs, creative briefs, media briefs, channel briefs. Each with its own template, its own ritual, its own gatekeepers. The brief was where thinking became transferable. It was the artefact that turned a strategist’s intent into something a creative team, a media planner, or an agency partner could act on.
That wall is shifting. And the question worth asking — out loud, in the room, with the people whose jobs are wrapped around the artefact — is whether it still holds anything up.
What’s actually changing
Three signals, all pointing in roughly the same direction.
The first is happening on ad platforms. Meta’s Advantage+ has all but dismantled the manual targeting playbook a generation of performance marketers learned by heart. Upload your creative, set your objective, hand the audience decision to the model. Google’s Performance Max does the same across its inventory. The pitch from both is essentially: stop briefing the audience, the algorithm knows them better than you do. Whether you believe that or not, the workflow has already moved.
The second is the rise of GEO and AEO — generative engine and answer engine optimisation. The premise is that an increasing share of buying journeys will start (and sometimes end) inside ChatGPT, Claude, Perplexity, or Gemini, where there is no SERP, no ad slot, and no media plan in the traditional sense. You are no longer briefing a channel. You are influencing how a model represents your category, your brand, and your competitors when someone asks it a question.
The third I recently read in this recent piece by Shiv Singh, The End of the Brief as We Know It. His argument is that the brief was a bridge between thinking and making — and that AI has collapsed the distance between those two acts to near zero. Business leaders, he writes, are no longer turning up with specification documents. They are turning up with working prototypes. The conversation is no longer about interpreting the brief; it is about improving something that already exists.
Put the three together and a reasonable question emerges. If the audience is chosen by an algorithm, the channel is a generative model, and the creative arrives as a prototype rather than a description of one — what is the brief actually briefing?
The uncomfortable bit
This is where it gets interesting for anyone responsible for capability inside a large organisation, because the brief was never just a document. It was a training apparatus. It was how junior strategists learned to think. It was how account teams learned to translate. It was how agencies and clients negotiated intent. Removing it (or even substantially reducing its role) does not just change a workflow. It removes a scaffold that an entire profession learned on.
The honest read is that some of what the brief did was genuinely valuable, and some of it was process theatre. The valuable part (sharpening the behaviour change you’re trying to drive, naming the audience truthfully, defining what good looks like) doesn’t go away. It arguably matters more, because the cycle time has collapsed and the cost of putting out fluent nonsense at scale is too high. The theatre part — the rounds of revisions, the template wars, the months-long brief-redesign projects Shiv references — probably should have died a while ago.
Practical things to consider, if any of this rings true
Rather than a list of how to write a better brief, here are four things worth pressure-testing in your own organisation. They cluster around the same idea: in an AI-mediated funnel, your competitive edge is the speed and quality of your feedback loop, not the elegance of your briefing document.
Start by asking what your team is actually measuring once a campaign is live on an Advantage+ or Performance Max-style platform. If the algorithm is choosing the audience, your performance data is no longer a clean test of your hypothesis — it is a test of the platform’s. Be deliberate about what you can still learn from it, and what you can’t. The skill that matters now is reading model behaviour, not writing audience definitions.
Then look at the loop between insight and creative. If you can prototype an ad, a landing page, or a customer journey in an afternoon, the question is no longer “did we write a good brief” but “how quickly can we tell a good output from a bad one, and act on it.” That is a judgement skill, and it has to live closer to the work than it used to. Worth asking who in your team has it, and how the people who don’t are going to develop it.
For GEO and AEO, the feedback loop is harder still, because you often cannot see the surface where you are being represented. Build a habit of regularly querying the major models for your category, your brand, and your competitors, and treat the answers as a measurement signal in their own right. The brief, here, is closer to a corpus than a document — what exists about you in the world is what the model will say about you.
And finally, be careful with the brief-shaped hole. If you do retire or shrink the brief, something has to do the work it was doing — naming the behaviour change, holding the line on brand, deciding when something is actually good. That work tends not to disappear. It tends to migrate, often invisibly, often onto people who were not set up to carry it.
Sitting with the question
So: is the brief dead? Probably not, in the literal sense. Briefs of some form will persist, because humans need shared artefacts to align around, and AI tools need clear inputs to produce useful outputs. But the brief as the central artefact of marketing — the document the rest of the system organises itself around — is harder to defend than it was eighteen months ago.
Whether that is a loss, a liberation, or something more interesting in between probably depends on what you thought the brief was for in the first place.
Cognitive Union works with large B2C and B2B businesses to build the commercial skills, digital fluency and customer-first thinking their teams need to perform — closing the capability gaps that sit between where teams are today and where the business needs them to be.
Lead. Don’t follow.
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