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System One Harness

harnessrouter/systemoneharness

Open-source harness that turns a System One decision model such as TypeSafe's Jev into an agent loop: one model call per step, only declared actions, risk-based confidence gates and complete traces. Works with Python processes, MCP servers, browsers and the UHP protocol.

STEP BY STEP

Install guide

The full step-by-step guide lives in a Google Docs document.

Open the guide in Google DocsUpdated 9/23/2026
GitHub preview image of System One Harness
GitHub stars
125
Language
Python
Added
9/23/2026

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