Harness Engineering — Building Reliable Workflows Around Non-Deterministic Agents

Six months ago this was a blog post. Then a second blog post. Then Bridle, Sellier, intent-driven-delivery, and eventually Keystone. Now it’s a book: Harness Engineering — Building Reliable Workflows Around Non-Deterministic Agents. What surprised me writing it: the experiments earned their place. Bridle taught me the flywheel. Sellier taught me defaults beat flexibility. IDD taught me the team layer can be reified. Keystone is the synthesis they pointed at. It’s on LeanPub now. Pay what you want, starts at