Repo · Agents & browsers

System One Harness

Python controller that turns a System One decision model into an agent loop: observe an environment, compile a finite action space into typed…

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The system one Harness for system one models

How builders describe it

Python controller that turns a System One decision model into an agent loop: observe an environment, compile a finite action space into typed questions, gate by confidence, execute one action per step, and record a full trace. First supported model is TypeSafe Jev (OpenRouter or TypeSafe API).

A Python harness for System One models. It runs Jev and other decision models locally, or through HarnessRouter.ai.

The decision Jev makes

Pick the next click, field or navigation from the legal actions on screen.

Where it fits

Browser agents need to choose an action on every step. With Jev each step is a choice from the actions actually available on the page, which keeps agents fast and on the rails. All 299 agents & browsers projects →

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