An AI agency is a company you pay to build one AI system, like a tool that answers every new lead within five minutes. They build it, test it, invoice you, and leave. That's the right buy when you know what you want built and someone on your staff will own it after. If nobody will, don't buy it.
Leads come in through your website at 9pm and sit there until somebody gets to them in the morning. Your office manager spends every Friday afternoon building the same report. One of your staff is already pasting client emails into ChatGPT to draft the replies.
Three decks, three follow-up emails, and every one of them is some form of AI agency. One calls itself an AI automation agency, one an AI development agency, one an AI consultancy. Odds are one of them is reselling somebody else's software with a login.
I've sold agency work for years, ads mostly. These days I'm into AI employees. I had one of them pull the search numbers for this post and read the top ten pages, to see what you'd get if you typed what does an AI agency do into Google. It then gave me the brief that I read before starting to work on this post.
An AI agency builds for you and then leaves
Take the 9pm leads. You want every one of them answered within five minutes, whatever time it comes in. An AI agency builds that. They pick the software, write the replies it sends, connect it to your inbox and your CRM, test it for a couple of weeks, and show your office manager how to log in. Then they send the final invoice.
A team of people, a start date, an end date, and a bill with their hours behind it.
Fair trade. Nobody at your business has a spare week this month. They do.
The agency will build you a lead responder if you ask for it, or something that drafts proposals if you ask for that instead. Deciding where to use AI, and what's worth building first, is a consultant's work, not an agency's. I cover that in how to compare AI consultants.
Once the agency leaves, it's either somebody already on your payroll looking after it, or it's no one and the work won't get done. Nobody will catch it when it starts getting things wrong.
After the handover, the lead responder is yours
The agency's last invoice is paid. The lead responder is still signed into your inbox and your CRM, still answering the 9pm leads. Nobody at the agency is watching it.
It follows the steps the agency wrote in the spring. In the fall you raise your rates, and it keeps quoting the old ones until somebody at your business changes them.
The first person to hear about it is whoever answers your phone. A lead calls to ask why the email and the website show two prices. Your receptionist takes that call and walks it over to someone. That someone needs a name.
Building it is a project. Running it isn't.
Building the lead responder has an end. The agency sets it up, tests it, hands it over, and the project is done.
Running it never ends. A lead comes in tonight and another one tomorrow. Every new Google review wants an answer, the quote you sent Thursday went quiet, and the Friday report is due again next Friday. Somebody has to hold that job next month and the month after, and the agency's team is gone.
When that kind of work goes to AI, it's closer to a hiring decision than a build. I wrote about what to ask for in choosing an AI staffing agency.
A retainer with no end date costs more than the invoice
A project fee pays for the lead responder, one build and one last invoice. A retainer pays the agency every month, which is fair when there's something each month you can open and check, like the replies the responder sent and what the agency changed.
With no end date and nothing to open, you pay twice, once on the invoice and once in your own time reading a report that doesn't say what anyone did to the responder... or you stop reading it and keep paying.
When an agency is the wrong buy
An agency is the wrong buy when nobody on your staff will take the lead responder on. You'll have replies going out in your name that nobody reads.
It's the wrong buy when the work you want off your plate is different every week. This week it's cleaning up a client spreadsheet, next week it's a form the bank needs, the week after it's a letter you've been putting off. An agency can build a system for work that repeats, like the 9pm leads. It can't build one for work that's never the same twice. That's a job for a person, or for you and ChatGPT on a Tuesday afternoon.
Or you haven't picked what to build yet. The 9pm leads bother you, and so does the Friday report. An agency will build whatever you name. Picking it is work to do before anyone quotes, with someone who can tell you which jobs AI can actually hold.
The invoice won't tell you which one you bought
An agency sells you people who build the lead responder and hand it over. I build digital employees, AI that holds a job inside your business, like answering every 9pm lead within five minutes. Each one reports to someone on your staff on how many leads it answered, and how fast.
Two different purchases. Say out loud which one you're buying before you sign.