HarnessRouter open-sourced: one interface for System One (Jev), Codex and Claude Code
A developer open-sourced a unified agent harness layer where System One (powered by Jev) and 13 other harnesses including Codex and Claude Code share one protocol, and it runs locally for free.
Finally, an OpenRouter for agent harnesses! (including System One by Jev) Devs just open-sourced plug-and-play infrastructure layer that lets you run any harness under a single interface for free, like: - Codex - Claude code - Hermes - DeepSeek Harness - System One, powered by Jev - And 9 more agent harnesses This means you can bring Jev into the same product that already uses Codex, Claude Code, or another supported harness, without writing another implementation for sessions, streaming, files, cancellation, and failure handling. Here's the repo: http://github.com/HarnessRouter/harnessrouter The harnesses run locally, and the Unified Harness Protocol (UHP) defines the common task interface with an OpenAI Responses-compatible API. If you want to dive deeper, the article below explains how to set up Jev from scratch, check it out ↓
This post quotes another post: x.com/zodchiii/status/2101243146596384854