yao

About yao

Yao is an open-source runtime for building AI agents and web applications — shipped as a single binary.

Think of Yao Agent as a cage, not an animal. What you put inside determines the behavior; the cage keeps it controlled.

Create Hook runs before the executor — inject context, enforce constraints, route requests. Next Hook runs after — validate output, trigger downstream actions, drive multi-step loops. The AI does the heavy lifting. You define the boundaries.

From the project's README

yao is an open-source project written primarily in Go, with 7.6k stars on GitHub. It was last updated in August 2026.