Building the Safety Layer for AI Agents

Raindrop is building the safety layer for AI agents. As agents get more capable and take on more complex work, Raindrop detects when they go wrong in production, from failed tool calls and hallucinations to problems companies didn’t even know to look for. They’re already used by companies including Vercel, Clay, Framer, and Speak, and just raised a Series A, bringing their total funding to $50 million.

In this episode of Founder Firesides, the founders sat down with YC's Diana Hu to share how a tool they originally built to debug their own coding agent became the company, why better AI agents actually create more ways for things to go wrong, and how their new simulations product can catch failures before they ever reach production.