Agent reliability became a funded product category in four places at once this week.

Prefactor and Cekura at the top of Product Hunt. Replit disclosing its marketing agent reviews its own nightly traces and A/B-tests prompt-change PRs. Monaco's Sam Blond telling SaaStr AI 2026 that most AI sales tools are "dead on arrival" and buyers must pressure-test unhappy paths and audit exactly what the tool writes back to the CRM. Arize closing a $70M Series C for LLM observability. The layer being funded is no longer the agent. It's the thing that proves the agent didn't quietly break. (Product Hunt)