For solo founders and small teams (under ~50 people) building with AI in 2026, the build-vs-buy decision tree has inverted: specification, not engineering capacity, is now the bottleneck. The teams that can describe their workflow in operational detail can ship things they could not previously afford to build; the teams that cannot still cannot ship, regardless of how good the AI tooling is.

Operators-register companion to AM-101/102/103 build-log series. Anchored against three Q1 2026 ventures Peter shipped with AI-paired development (DealVex B2B SaaS for autodealer, Rhino-basketball club ops, agentmodeai publication). 60-day review: any of the three ventures stalls because of capacity (would weaken), any new venture launches under same model (would strengthen), specific specification-failure modes surface in defensible form.