How to Brief an Agency: A Founder's Guide

Most agency engagements go wrong before any work begins.

The kickoff is friendly. The proposal is signed. The team is assembled. Three weeks later, the founder is frustrated, the agency is confused, and both sides are quietly rewriting their assumptions about what the project was supposed to be.

The cause is almost always the same. The brief was wrong, incomplete, or never really existed. The agency made guesses to fill the gaps. The founder did not catch the guesses until the work was already underway. By the time the misalignment surfaced, the budget was committed and the timeline was tight.

A good brief prevents this. Not by being long, but by being specific in the right places. This guide is for founders and operators who have not hired an agency before, or who have hired one and felt like the process worked against them.

What a brief is, and what it is not

A brief is a written document that tells the agency three things: what the business is trying to achieve, what constraints exist, and how success will be measured.

It is not a list of features. It is not a wireframe. It is not a Pinterest board. It is not a competitor list, although it may include one. It is the strategic context that lets the agency make good decisions about everything that comes next.

The most common briefing mistake is to lead with the solution. "We need a new website with these ten pages and these five features." This skips the strategic layer and forces the agency to either build exactly what was specified, even if it is wrong, or to push back and risk seeming difficult. Neither produces good work.

A better brief leads with the problem. "Our current website is producing ten leads a month. We need it to produce forty. Here is what we know about why it is underperforming. Here is the audience we are trying to reach. Here is what success looks like." That brief lets the agency think.

The five sections every brief needs

The structure below works for almost any agency engagement, whether it is a website, a brand, a campaign, or ongoing marketing services. Adjust the depth of each section based on the size of the project.

Business context

A few paragraphs explaining the business. What it does. Who it serves. How it makes money. How it is doing. What is changing. The agency cannot make good decisions without understanding the business. Most briefs underdeliver here, assuming the agency will figure it out from the website. Do not assume that.

Specifically include: revenue range or stage, growth trajectory, competitive position, and any recent shifts in strategy or market. The agency does not need to see your books. It does need to know whether you are an established business looking to optimize or an emerging one looking to scale.

The problem to solve

This is the most important section, and the one most briefs skip.

Why are you doing this project, now? What is broken or limiting that the work is meant to address? What happens if you do nothing? What have you tried already, and why did it not work?

A brief that opens with "we want a new website" tells the agency very little. A brief that opens with "our current website was built five years ago, our positioning has shifted twice since then, and we are losing high-intent prospects to a competitor whose site is significantly clearer than ours" tells the agency exactly what kind of work is needed.

Be honest about uncertainty. If you do not know exactly what is wrong, say so. The diagnostic phase is part of what you are paying for.

The audience

Who is the work for? Not in demographic terms, but in decision-making terms. What do they care about? What are they comparing? What objections do they raise? What does the agency need to know to write copy that resonates with them?

If the audience is multiple distinct segments, list each one and its priority. Most briefs say "small and medium businesses" and stop there. That is not enough information to design for. Two SMBs in different industries with different urgency levels are effectively different audiences.

If you have done customer research, share it. If you have not, say so. Either is acceptable. Pretending you have done research you have not is a common briefing mistake that produces work disconnected from reality.

Goals and success metrics

What does success look like, and how will you measure it?

Be specific. "Increase leads" is not measurable. "Increase qualified leads from the website to forty per month within six months of launch" is. Some goals are quantitative. Others are qualitative. Both are valid, but both should be written down.

This section also serves a second purpose. By making goals explicit, the brief allows the agency to push back if the goals are unrealistic given the timeline, budget, or scope. Better to have that conversation in week one than week eight.

Constraints

Budget. Timeline. Stakeholders. Technology. Brand guidelines. Anything that limits what the agency can or should do.

The most common omission is budget. Founders sometimes withhold the budget out of a belief that revealing it will cause the agency to spend exactly that amount. The opposite is closer to true. Withholding the budget forces the agency to either guess, in which case the proposal is poorly tailored, or to provide multiple options, in which case the founder has to make scoping decisions without enough information.

Provide a budget range. Even a wide one. "Between thirty and fifty thousand" is more useful than no number at all. The agency can then tell you what is realistically possible at each end of that range.

What not to put in the brief

The brief should describe the problem and the parameters. It should not prescribe the solution.

Specifically, avoid:

A page-by-page sitemap. Let the agency propose the structure based on the strategic brief. If you have strong opinions about specific pages, share them as preferences, not requirements.

A list of features ("we need a chat widget, a portfolio carousel, an FAQ accordion"). The agency should propose features based on what serves the goals. A long features list before strategy is a sign that the founder is buying tactics instead of outcomes.

Visual references that are too prescriptive. Showing three sites you admire is useful context. Demanding the new site look "exactly like that one" eliminates the agency's ability to design for your business. The references should communicate taste, not specification.

Detailed copy. Unless the project is explicitly limited to design and the copy is locked, do not write the copy in the brief. The agency should be involved in messaging strategy, and dictating the copy upfront often produces wording that is wrong for the audience or disconnected from the design.

What to ask the agency to provide

A good brief invites a specific kind of response. The proposal should answer:

How does the agency interpret the problem? Their interpretation often reveals more than their solution. If they have understood the brief, the interpretation will surface nuances you did not write down. If they have not, the interpretation will read like a generic restatement.

What approach would they take? Not a final plan, but a clear point of view on how they would tackle the work. This is where good agencies separate themselves. The mediocre agency will describe a process. The strong agency will describe a thesis.

What would the engagement look like in the first thirty days? Specific, week-by-week. The first month of any agency engagement sets the trajectory. If the agency cannot describe it concretely, that is a warning.

Who is on the team, and what is each person doing? Names, roles, time allocations. If the proposal vagues this up, the agency is hiding something. Often that something is that the senior people you are about to meet will hand you off to junior people the moment the contract is signed.

A clear scope and price. With assumptions stated. Vague pricing is almost always bad pricing.

The signal you are looking for

The point of a good brief is not to commodity-shop multiple agencies on identical specs. It is to find the agency whose interpretation of your problem makes you think, "I had not seen it that way, but that is correct."

The agency that responds with a deeper read of your situation than you wrote in the brief is the agency to take seriously. They have already started doing the strategic work, before any contract. The agencies that respond with surface-level summaries and generic processes are showing you what working with them will feel like.

A great brief produces great proposals. A great proposal produces a great engagement. A great engagement produces work that compounds for years.

The brief is the first one percent of the project, and it determines disproportionately how the rest of the ninety-nine percent will go. Spend the time. Write it well. The work that follows will be measurably better for it.