Three buyer types dominate agent purchases, and each cares about different outcomes. Ops leaders buy efficiency — they want hours saved, error rates down, and headcount flat while volume grows. Revenue leaders buy pipeline — meetings booked, leads enriched, proposals generated faster. Compliance and legal buy audit trails — every action logged, every decision explainable, every output reviewable.

The critical insight: sell to the budget holder, not the user. A support agent should be pitched to the VP of Support with ROI math ('40% of tier-1 tickets resolved without human touch'), not to the engineering team with architecture appeals. An engineering champion helps you get in the door; the budget holder gets you paid.

Map your buyer persona. If your agent saves ops time but the budget sits with IT, you need an IT security/compliance angle. If it saves time but procurement controls software spend, you need a revenue attribution story.

Horizontal agents ('AI email writer,' 'AI meeting assistant') compete on price against free tools from OpenAI, Google, and Microsoft. Vertical agents ('HIPAA-compliant prior auth agent,' 'construction bid review agent') compete on trust, workflow depth, and domain expertise — advantages that take months to replicate.

Vertical almost always wins for indie builders and small teams. You do not need to out-spend horizontal players; you need to out-know them in one industry. A dental billing agent that understands CDT codes, payer rules, and clearinghouse formats is defensible. A generic 'AI for healthcare' product is not.

Pick a vertical where you have domain access (former job, advisor network, design partner) and where the workflow has expensive manual steps. Real estate transaction coordination, insurance claims intake, and legal document review are strong examples with clear ROI and reachable buyers.

Enterprise adoption follows a predictable curve: pilots in 2025-2026, standardization in 2027-2028. Right now, enterprises are running 3-5 agent pilots across teams, looking for 2-3 winners to roll out company-wide. This is the best window for design partners — enterprises are actively buying but have not locked in vendors yet.

SMBs move faster but spend less. A 50-person company will adopt in days (Stripe checkout, self-serve onboarding) but pay $200-1,000/month. A 5,000-person enterprise takes 3-9 months but pays $25,000-250,000/year. Match your sales motion to your target segment.

The fastest SMB adoption path: integrate with tools they already pay for and trust. An agent that works inside HubSpot, QuickBooks, or Zendesk inherits their distribution and trust. Standalone agents require building trust from scratch.