The Setup
A marketing agency we've been watching for 18 months runs 25 people against a portfolio that would normally require 40. They don't have a secret growth channel. They don't have proprietary AI. They run four agents, all built on off-the-shelf tools, all managed by one operations lead.
Here's the full stack — what each agent does, what it replaces, and what it costs.
Agent 1: The Intake Agent
What it does: Handles all inbound inquiries. Every form submission, every DM, every "hey do you guys..." email. The agent classifies the inquiry (new business / existing client / recruiter / spam), asks 3-5 qualifying questions if warranted, books a discovery call if the scoring thresholds are met, and sends a templated "sorry, not a fit" response otherwise.
What it replaces: A $55K/year business development coordinator.
What it costs: About $180/mo in API credits + a $2,500 one-time build.
Agent 2: The Research Agent
What it does: Any time a new prospect is booked, the agent pulls a 2-page pre-read: company overview, recent news, key people, org chart if available, top 3 strategic bets the company has made in the last 18 months, and 5 candidate talking points the account lead can use.
What it replaces: About 4 hours of research per prospect, previously done by account leads before calls.
What it costs: ~$4 per pre-read in API + data costs. At 12 prospects/week, that's ~$190/mo.
Agent 3: The Creative Brief Agent
What it does: Translates a 30-minute client meeting (transcript input) into a structured creative brief — objective, audience, deliverables, deadlines, budget, tone, brand guardrails — in the agency's house template.
What it replaces: 2-3 hours of post-meeting work by a project manager or account lead.
What it costs: ~$1.50 per brief. Maybe $60/mo all in.
Agent 4: The Weekly Exec Brief Agent
What it does: Every Monday at 7 AM, pulls data from HubSpot, Toggl, Notion, and the agency's P&L. Produces a 1-page report: active projects + health, hours burn vs. quoted, cash position + 30-day runway, pipeline velocity, and three specific recommendations for the partners to look at this week.
What it replaces: A finance manager's weekly report prep + a COO's Sunday-night meeting prep.
What it costs: ~$25/month in credits + a $1,800 one-time build.
The Whole Picture
Ongoing run-rate cost: ~$455/month. One-time build cost: ~$4,300 amortized over a year. The four agents replace about 1.5 full-time roles at ~$130K/year total fully loaded. The net math is stark.
But the quieter change is in how the remaining 25 people spend their time. Before: lots of scoped "coordination" work. After: client strategy, creative execution, and new business — the things the agency was hired for.
Why This Is Not Out of Reach for a 10-Person SMB
Most SMB owners look at a setup like this and think "We'd need a CTO to build all that." You don't. Every one of these four agents is a Claude Project with a custom system prompt, a couple of integrations, and a Slack or email delivery mechanism. Tools like Ascero AI's Agent Packs install all four patterns with a fixed fee and a 2-week turnaround.
The hard part is never the technology. The hard part is deciding which four. That's what the $2,500 AI Audit is for — it maps your workflows, ranks them by ROI, and tells you the order.