Nice paper showing just how far you can push an agent harness.

In most setups, the default coding agent harness is static. Capabilities get wired in at design time, and the run has no way to change how it is being executed.

openJiuwen is an open-source harness built to fix that.

It reaches 82.6% on SWE-bench Verified and 87.19% on Terminal-Bench 2.1, ahead of the strongest official leaderboard entries by 3.4 and 3.39 points.

A bit on how openJiuwen works:

Rail-based composition lets developers assemble single agents, delegated sub-agents and swarm flows over one shared execution substrate.

Runtime evidence from semantic diagnostics, execution outcomes and task progress then reshapes context, feedback and task control while the run is still going.

The model policy stays fixed throughout, so the gains are attributable to the harness rather than to the model underneath it.

Paper: https://t.co/QegawA8cxB

Chat with Paper: https://t.co/DTmu2Dx8vu