How to Brief an Agency: A Practical Guide and Checklist

To brief an agency well, give it a clear problem, one message, a specific audience, the brand’s rules (including what it must never say), the exact deliverables and the standard the work will be judged against. Then stay involved: a brief is the start of a conversation, not a handoff. Most disappointing agency work traces back to a brief that left the important decisions to the agency, and an approval process that judged the work by taste rather than by the brief.

This guide covers what to prepare, how to run the briefing, and how to keep agency work on strategy once it goes into production. For the brief document itself and a template, see creative brief.

Before the briefing: decide what only you can decide

An agency can solve a creative problem. It can’t make your strategic decisions for you. Settle these before you brief:

Decision	Why you have to make it
The business problem	“Increase awareness” isn’t a problem. “First-time buyers don’t know we offer fitting” is.
The single message	If you give three messages, the agency will choose one, or try all three and land none.
The audience	Only you know which customers you actually want more of.
What’s off-limits	Claims, framings, words and audiences the brand avoids. The agency can’t guess these.
How success will be judged	Who approves, against what criteria, and what happens if the work misses.

What to give the agency

1. The written brief: background, objective, audience, insight, single-minded message, reasons to believe, voice, mandatories, must-avoids, deliverables, timeline and budget.
2. The strategy documents: positioning statement, messaging framework and voice guidelines. Link them, but also put the parts that matter for this project into the brief itself.
3. Examples: approved past work and, just as useful, rejected work with a short reason.
4. Format constraints: for performance work, character limits, number of variants and channel rules. A message that works in a 60-second film may not survive a 30-character headline.
5. Access to people: the product team, sales or customer service, for insight the brief can’t capture.

How to run the briefing

• Brief in person or on a call, not only by email. The questions an agency asks reveal what the brief doesn’t answer.
• Explain the reasoning, not just the instructions. Teams that understand why a rule exists apply it better in situations the brief didn’t anticipate.
• Ask the agency to brief you back. In their own words: the problem, the audience, the message, the must-avoids. Any gap shows up immediately.
• Agree on the review process. Who sees what, when, how many rounds, and against which criteria.

Briefing agencies on performance work

Brand campaigns get careful briefs. Performance advertising, where the volume is, often gets a spreadsheet of keywords and a budget. That’s where brand presentation tends to slip: hundreds of short ads written quickly, by junior specialists or AI tools, judged on click-through rate.

For performance work, add three things to the brief:

• Approved short-form lines for each core message, already within character limits.
• A list of banned words and framings for ads: for a premium brand, typically discount language in headlines, urgency phrases and generic calls to action used on their own.
• A rule for how every ad will be checked against the brand’s strategy before it goes live, and by whom.

In our benchmark of premium retailers’ Google Ads, 42% of headlines led with a discount and 37% were generic templates. Those ads weren’t wrong by any agency’s usual standards. They just weren’t briefed against the brand.

How to judge the work that comes back

Judge the work against the brief, not against personal preference. A short checklist:

• Does it deliver the single message?
• Is it aimed at the audience in the brief?
• Does it use the brand’s voice?
• Does it avoid everything on the must-avoid list?
• Could a competitor have published it unchanged?

For high-volume work, the checklist has to be applied to every piece, not a sample. That’s only practical with a systematic check, run independently of the agency that wrote the copy. An agency checking its own work, like an AI tool grading its own output, tends to approve its own patterns. We explain why in brand compliance tool vs AI copy generator.

Working with several agencies

When a brand works with several agencies, by channel or by market, each one slowly develops its own version of the brand. Three practices keep them aligned:

1. One strategy source for all agencies, not separate decks per agency.
2. The same check for everyone, so agencies are judged by the same standard and see the same feedback.
3. Regular reporting on how each agency’s work matches the strategy, so differences are visible early. That reporting belongs in your brand governance model.

Agency briefing checklist

• Business problem stated in one sentence.
• One single-minded message.
• Audience described as a situation, not a demographic.
• Must-avoids listed: claims, framings, words, audiences.
• Strategy documents linked and the relevant parts copied into the brief.
• Approved and rejected examples attached.
• Format constraints and variant counts specified.
• Review process, approvers and criteria agreed.
• Agency has briefed back in its own words.
• Every piece of work will be checked against the brief before publication.

FAQ

Vashor is a brand governance platform that checks every ad against the brand’s declared strategy before it goes live, whichever agency wrote it. It never writes the copy. See how Vashor checks your content →