Harness Engineering 2.0 is here!

Harness Engineering 2.0 has arrived, offering a new infrastructure layer called HarnessRouter that turns existing harnesses like Codex and Claude Code into plug-and-play agent backends. This allows products to run tasks, retrieve results, and switch harnesses through a single API, implementing the Unified Harness Protocol (UHP) and providing an OpenAI Responses-compatible API.

The platform supports 30 harness × model configurations, with varying metrics for cost and speed depending on the task. To get started, users can run the platform locally using Docker, integrate it into their product, or use starter kits. A self-host Community Edition option is also available for those who prefer to control their own infrastructure.

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