Most agency briefs are written for the briefer, not the agency. They list aspirations, omit constraints, and obscure the things the agency most needs to know. The result is a discovery process that re-creates the brief from scratch — paid for, of course, by the client. A useful brief shortens that process by weeks and changes what is possible inside the budget.

What a brief is for

A brief is the document that tells the agency what to make and what to be careful of. It is not a wish list, a vision statement, or an executive summary. Its job is to compress the founder's context — what's already been tried, what is non-negotiable, what success would look like — into something the team responding to it can actually act on. The shorter and more honest the brief, the better the response.

The reason most briefs miss is that the briefer writes them with the agency reading over their shoulder. The aspiration creeps in; the awkward truths drop out. The agency fills the gap with assumptions that are sometimes right and frequently expensive.

The six things to send

1. The decision the work has to support

Begin with the single decision the work is meant to enable. "We are about to raise a Series A and the deck is the bottleneck." "We are merging two product lines under one brand and need a credible articulation by Q3." "Our customer-acquisition cost has doubled and we need to know whether brand or product is the leak." The agency should know within thirty seconds why this work exists now.

2. The audience and the audience you're not for

One paragraph naming who specifically the work is for, in real recognisable terms — and one sentence naming who it is not for. The non-audience is the bit most briefs omit; it is the bit that gives the agency the most useful constraint. A brief addressed to "growth-stage SaaS founders, not enterprise procurement" tells the responder more than three pages of persona work.

3. What you have already tried

The work that has already been done — internal, agency, freelance — and what the result was. Most briefs hide this because it can feel embarrassing. Showing it accelerates the agency past the dead ends and prevents you from being charged again to discover them. The two sentences "we tried X internally and it stalled because of Y" are some of the highest-leverage in the document.

4. The constraints that are actually binding

Time, budget, regulatory, technical, political. Be specific. "We have £80k and the work has to be presentable by 30 June" is more useful than "we have a competitive budget and a tight timeline." Constraints are not weaknesses — they are how good agencies design proposals that can actually deliver. Ambiguous constraints become contested constraints; contested constraints become scope arguments.

5. What you mean by good

One paragraph describing what success would look like in twelve months — not at launch. The launch is a moment; the twelve-month outcome is the thing that justifies the spend. If the brief defines success only at launch, the agency will optimise for the launch and the long-tail value will be left on the table.

6. Who decides, and who else has to approve

Name the single person whose word is final on creative direction, and the people whose veto matters at each stage. Agencies that don't know who decides will design for the loudest voice in the room — which is rarely the right voice. This is one of the kindest things you can do for an agency relationship.

What to leave out

Three things routinely added to briefs that subtract value:

• Mood boards as direction. Mood boards are useful inputs to creative work, not constraints on it. Including them in the brief tells the agency what you like rather than what the work needs to do — and the agency will reverse-engineer the brief from the mood board, not the other way around.
• Long aspirational sections. Vision statements, mission paragraphs, and brand-purpose essays belong in the strategy, not the brief. The brief is operational. Save the philosophy for the kick-off conversation where it can be discussed, not assumed.
• Open-ended deliverable lists. "Logo, brand guidelines, website, social templates, deck, pitch materials, signage, ..." is not a brief; it is a wish list. The brief should ask the agency to recommend the right deliverables for the constraints you've named, not enumerate them all.

Common pitfalls

Three patterns recur. The first is the founder's-voice brief — written in the founder's preferred phrasing, full of internal references, hard for an outsider to parse. The second is the committee brief — every stakeholder added a paragraph, and the result has no centre of gravity. The third is the secondary-source brief — written by someone who is not the decision-maker, then forwarded; the agency responds to the wrong audience and the work is rebuilt at presentation.

All three are correctable in an hour. None is correctable after the agency has spent two weeks on the wrong premise.

What This Looks Like in Practice

The same operator-grade discipline we describe in brand strategy before Series A applies to the brief itself. A brief that names the decision, the audience, the constraints, and the definition of good is one that lets us start work from a clear premise — and lets the founder hold us accountable for it. The work that follows is materially better because the discovery phase doesn't have to invent what should already be on paper.

Closing

A good brief is two pages. It is honest about what has not worked, specific about what success looks like, and explicit about who decides. Writing one well takes an hour; not writing one well costs weeks.

If you are about to commission brand work and would value a quick sanity-check on the brief before you send it, we are happy to take a look.