AI Engineer World's Fair 2026 — unofficial import demo

Managing Partner, Untapped Capital

Yohei Nakajima is a General Partner and co-founder of Untapped Capital, a pre-seed venture fund backing unexpected founders at the earliest stages. He is best known as the creator of BabyAGI, one of the early open-source autonomous agent experiments that helped popularize task-driven AI agents. Yohei’s work sits at the intersection of venture capital, software prototyping, and frontier AI research: he builds tools and experiments to understand where technology is going, then uses those lessons to support founders and shape investment theses. Most recently, Yohei has been developing ActiveGraph, an event-log-native architecture for building agents that are replayable, inspectable, forkable, and capable of continuous improvement. Across investing, writing, demos, and open-source projects, his approach is simple: build to learn, share what works, and help more people understand what AI-native systems make possible.