Yaz Caleb

Yaz Caleb

Yaz Celebi / Yağız Erkam Çelebi

I build companies and the software inside them. Right now that means authorization for autonomous systems: agents call APIs, move money and sign contracts, but nobody has a good answer for who gets to say yes. Veto is my answer.

Turkish-Albanian, grew up in Ankara. Self-taught, finished high school three years early. I like Camus, Orwell, tennis and isolation lifts.

Age16

Now

The veto.so homepage: Stop risky AI actions before they happen.

Veto

Runtime authorization for AI agents. Veto checks risky actions before money moves, data leaves, records change or a customer gets contacted. Built at Plaw, Inc.

First page of the preprint Can Is Not May: Authority Models for Governable AI Agents

Can Is Not May

My preprint on authority models. Across 7,427 trials, prompt-only guardrails let agents take unauthorized actions 18.3% of the time; an external authority model let through none. Plaw and Arizona State University, March 2026.

Looking for a founding team[email protected]
Raising a pre-seed roundSchedule a call

Writing

All essays

Previously

Clade AI
Founder, 30+ people, shut down
ThirdLayer
YC W25
Cluely
One week
NASA Space Apps
Mentor, 2023
TED-Ed
Talk on terms and conditions
Yaz as a kid in a GAP sweatshirt
Before the companies.
Princess Maggie, a labrador, mid-yawn
Princess Maggie, 8.