How to Brief an AI Consultancy: What to Put in the First Email

29 June 2026 · AxionIQ · ai-consultancy / ai-vendor-rfp / project-scope / hiring-an-ai-agency / briefing

Knowing how to brief an AI consultancy is the difference between a useful reply on day one and three weeks of discovery calls that go nowhere. The brief that works is short. It names the outcome you want, the constraint you cannot move, and the budget you can defend. It does not specify the model, the framework, or the tech stack. Get those three things on the page and any competent partner can tell you within a day whether they can help, roughly what it costs, and where the risk sits. Six lines is enough.

The wrong way most buyers write the first email

There are two failure modes, and they are mirror images of each other.

The first is the tool-led brief. It reads: “We want to build an AI agent using GPT and a vector database to handle customer queries.” This over-specifies the solution and under-specifies the problem. You have just told a consultancy how to build something before anyone has agreed what success looks like. A good partner will quietly ignore your architecture and ask what you are actually trying to fix, which wastes the first call. A weaker one will simply build what you asked for, even when a far simpler approach would have worked.

The second is the vision brief. It reads: “We want to use AI to transform how we work and stay ahead of the curve.” This is the opposite problem. There is no outcome, no constraint, and no number, so there is nothing to price and nothing to verify. Hiring an AI agency on this basis guarantees a long, expensive discovery phase whose main output is the brief you should have written yourself.

Both come from the same place: uncertainty about what you are allowed to ask for, and a sense that briefing a technical supplier means sounding technical yourself. Buyers assume that learning how to brief an AI consultancy means learning enough about AI to specify the build. It does not. It means getting precise about your own business, which is the one thing no consultancy can do for you. The fix is a structure that forces the right three answers.

How to brief an AI consultancy: the six-line brief

Here is the AI project scope template we ask new prospects to fill in. It is deliberately short, because length hides the gaps.

1. The outcome. What measurable thing should be different in 90 days? “Cut first-response time on email enquiries from 6 hours to under 5 minutes.” Not “improve customer service.”
2. The volume. The number that sizes the problem. “Roughly 400 enquiries a week, 60% out of hours.”
3. The constraint. The thing that cannot move. “Must integrate with our existing CRM. Data stays in the UK. No customer-facing AI without a human escalation path.”
4. The current cost. What the problem costs you today, in money or time. “Two part-time staff, about £2,400 a month, and we still miss the evenings.”
5. The budget band. A range you can defend, not a precise figure. “We can justify £10k to £20k for build, plus a running cost under £500 a month.”
6. The decision. Who signs it off and by when. “I decide. I want to start within the month.”

That is the whole brief. A consultancy that cannot give you a useful response to those six lines is not the right consultancy. Notice what is absent: no mention of models, frameworks, or whether it should be a chatbot or an agent. Those are the supplier’s job to recommend, and the recommendation is part of what you are evaluating.

It is worth saying what this template is not. It is not a specification, and it is not a contract. It is a filter. The point of knowing how to brief an AI consultancy this tightly is to find out, fast and cheaply, whether a given partner thinks the way you need them to. A supplier who reads six lines and immediately asks about your current cost and your escalation constraint is one who builds for outcomes. A supplier who reads the same six lines and starts talking about which model they would use has told you something useful about how they will run the project.

The single most useful line is number four, the current cost. It is also the one buyers skip most. Without it, the partner cannot tell you whether the project pays back, and you cannot tell whether their proposal is reasonable. If you are unsure how the pricing on the other side should be shaped, our piece on outcome-based pricing for AI services explains what to look for in the reply.

A real example

A UK wholesaler wanted “an AI system to help the sales team.” That was the entire first email. Three consultancies had already given them three wildly different proposals, ranging from £8,000 to £140,000, which told the buyer nothing except that nobody had agreed the problem.

We sent back the six-line template. The answers reframed everything. The real outcome was not a sales tool; it was reducing the 90 minutes a day the internal team spent answering the same stock-availability questions from trade customers. The volume was about 300 enquiries a week. The constraint was that pricing logic had to stay with humans. The current cost was roughly one full-time equivalent. The budget band was modest and the decision-maker was the MD himself.

With that in hand, the scope became obvious and small: an internal availability-and-lead-times agent, not a sales platform. It came in at the low end of the range and shipped in under a month. The lesson was not that they briefed us well. It was that the act of answering the six questions told them what they actually needed, before a penny was spent. That is what a good brief is really for.

What this means for you

Knowing how to brief an AI consultancy well is a skill you build once and reuse on every project, internal or external. Three things to do before you send a single enquiry.

• Write the outcome line first, and put a number in it. If you cannot finish the sentence “in 90 days, X will have changed from A to B,” you are not ready to brief anyone. Spend an hour on this line before you do anything else.
• Cost the problem, not the solution. Work out what the current process costs in money or hours. This single figure is what turns an AI vendor RFP from a wish list into a business case, and it is the number every credible partner will ask for anyway.
• Send the same six lines to everyone. Identical briefs make proposals comparable. When you are hiring an AI agency, wildly divergent quotes against an identical brief are a signal: it usually means the cheap one scoped less than you need, or the expensive one is solving a bigger problem than you have.

Knowing how to brief an AI consultancy is genuinely most of the battle, because the brief is where the thinking happens. The supplier selection is easier once the problem is clear.

Frequently asked questions

How long should the first email to an AI consultancy be?

Short. Six lines of substance beat six paragraphs of context. State the outcome, volume, constraint, current cost, budget band, and who decides. A good partner would rather have a tight brief they can react to than a long one they have to decode. You can always add detail on the first call.

Should I tell an AI consultancy my budget?

Yes, as a band rather than a single figure. Withholding budget does not get you a better price; it gets you a proposal aimed at a guess. A defensible range lets a partner scope to fit, and the gap between their proposal and your band is itself useful information about whether you have agreed the problem.

Is learning how to brief an AI consultancy worth the effort for a small project?

Especially for a small project. The smaller the budget, the less room there is for a long discovery phase to eat it. A tight brief is what lets a modest project skip straight to a useful proposal. Knowing how to brief an AI consultancy is the single highest-leverage hour you can spend before any AI engagement, large or small.

Do I need a formal AI vendor RFP?

For most SME projects, no. A formal AI vendor RFP makes sense for large, multi-supplier procurements, but for a focused build it slows everyone down. The six-line brief does the same job faster. Reserve the heavy process for when the spend and the number of stakeholders genuinely warrant it.

A clear brief saves you the most expensive thing in any AI project, which is wasted discovery time. If you would like to pressure-test your outcome line before you send it anywhere, look at how we scope engagements or just send us your six lines and we will tell you honestly whether we are the right fit.