Y Combinator
Inside YC's AI Playbook
Summarised with Bite · 17 min read
YC general partner Pete Koomen reveals how YC transformed itself into an AI-native organization over the past year, building internal agent infrastructure that lets every employee tap into the collective intelligence of the entire team. The key insight: organizations that give employees control over AI prompts and centralize context in one accessible database will leapfrog competitors still treating AI as a corporate-controlled feature.
0:00 – 6:00
The Finance Team Problem That Started Everything
About a year ago, Pete Koomen sat in a meeting with YC's finance team that felt deeply wrong. Engineers were describing how they'd build custom software for complicated financial workflows, booking journal entries, logging priced rounds, all the mechanics that make YC run. The finance team would explain a workflow, engineers would disappear for weeks to encode it deterministically, then hand back purpose-built software. Repeat. At the same time, Pete was using Cursor and Windsurf for his own coding, experiencing what felt like superpowers. The divide kept growing. Why were finance people stuck waiting on engineers when AI could let them encode their own workflows in plain English? So YC built its own internal agent harness, starting with a simple tool registry. The first breakthrough came from a tool that let agents run read-only SQL queries against YC's production database. It sounds mundane until you realize YC runs everything on custom software sitting in one Postgres database: every funded company, every founder, every note from partners, every financial transaction. When all that context lives in one schema, an agent can answer questions like "show me all investors who backed space companies in the last four batches" without a data scientist writing SQL for hours. The magic wasn't just speed. It was volume. Partners started asking 10x more questions because friction vanished. You didn't need to justify your curiosity to someone else's backlog. Today YC has over 350 tools in the registry, everything from managing office hours to booking journal entries to planning events. The infrastructure that started as a finance project became the substrate for how YC operates.
6 more sections in the app
- 6:00 – 13:00Why Most Companies Are Still Stuck in 2013
- 13:00 – 21:00The Tool Registry as Organizational Memory
- 21:00 – 28:00The Two-Sentence Description Skill That Became Superhuman
- 28:00 – 34:00The Radical Transparency That Made It Work
- 34:00 – 45:00Horseless Carriages and the Future of Software
- 45:00 – 46:15Two Futures: Corporate Control or the Personal AI Revolution
