Open-sourced harness day 4: Jev for routing and workflow composition

Miguel Ríos Berríos @MiguelriosENOriginally posted 2026.10.23

Open original on X

Day 4 of open sourcing parts of our harness. Today we made significant improvements to our workflow DSL. We are using it in our self-improving loop - turning agentic loops into more deterministic recipes. With these improvements (a lot of @typesafe's Jev in routing, classification, and workflow composition), we have been able to reduce the cost of agents significantly without sacrificing performance. I meant to open source the learning loop as well, but removing the business logic from @grepdotai still needs work. Enjoy the demo tho : )