How to Vet a Marketing Agency (From People Who Are One)

We're an agency writing about how to choose an agency, so by all means take this with the appropriate pinch of salt. But here's why we think it's worth writing anyway: we've sat on the other side of the table too. We've hired vendors, been disappointed, and inherited the wreckage of brands who picked the wrong partner before they found us. We know exactly how the bad ones operate, because we've had to clean up after them.

Choosing an agency is one of the higher-stakes calls a growing brand makes, and most people make it on instinct and a nice-looking portfolio. That's understandable and almost always a mistake. The difference between a partner who genuinely moves your business and a vendor who just fills your calendar shows up early, in the very first conversations, if you know what you're listening for.

The one distinction that tells you everything

Here's the question underneath all the other questions: does this agency think, or does it just produce?

A content vendor asks what you want posted. A strategic partner asks what you're trying to achieve, and then tells you what they'd do about it, and why. It's a subtle difference in the first meeting and an enormous one over a year. If your opening conversation is all about deliverables, how many posts, how many reels, what's the turnaround, you're talking to a production line. If it's about your business, your customers, and what success would actually look like, you might have found a partner. We try to talk about outcomes before formats in every first call, because the format should be a consequence of the strategy, never the starting point.

Questions that cut through the pitch

Pitches are designed to impress. These questions are designed to get past that and see how an agency actually thinks:

• "What would you do differently from what we're doing now, and why?" A good agency will have a point of view within minutes. A weak one will flatter your current approach.
• "How do you measure success, and how often will we hear about it?" This tests whether they're accountable to results or just to activity.
• "Who, specifically, will do the work day to day?" Plenty of agencies sell you the senior team in the pitch and hand you juniors after you sign. Find out before, not after.
• "Show me a result you're proud of, and walk me through how you got there." Anyone can show a pretty deck. Far fewer can explain the thinking that produced a result.

Red flags worth walking away from

Some signals are bad enough that we'd advise ending the conversation, however charming the people are:

• Guarantees of specific numbers. Nobody credible promises outcomes they don't fully control. "We'll get you 50k followers" is a sales tactic, not a strategy.
• No curiosity about your business model, only your channels. If they don't care how you make money, they can't help you make more of it.
• A deck-and-disappear model with no real measurement loop. Strategy without follow-through is just expensive theatre.
• Pricing with no relationship to scope. If the number doesn't move when the work changes, the number was never really about the work.

Agency, freelancer, or in-house?

An agency isn't always the right answer, and we'll happily say so. If you have a single, well-defined task, design this one thing, run this one campaign, a good freelancer is often the most efficient choice, and you shouldn't pay agency overhead for it. If your marketing has grown to the point where volume and institutional memory justify a salaried team, building in-house starts to make sense.

An agency earns its place in the middle of that spectrum: when you need real strategy plus execution across several channels, and you need it now, and building the whole department yourself would be slower and more expensive than it's worth. The honest agencies will tell you when you're outside that sweet spot. Be a little wary of the ones who insist they're the answer to every situation.

Trust the chemistry, then verify it

You're going to spend a lot of time with these people. If the early conversations feel sharp, honest, and genuinely curious about your business, that's a real signal and worth weighting. But don't stop at the feeling. Check references. Ask their current clients the uncomfortable questions. Look at results you can verify rather than claims you can't.

The right partner shouldn't feel like a supplier you manage. It should feel like you've added the smartest person in the room to your marketing meetings, someone who'll disagree with you when you're wrong and have the work to back it up. That's a high bar. It should be.