HarnessBridge: Learnable Bidirectional Controller for LLM Agent Harness

In three linesHarnessBridge is a learnable agent-environment interface controller using bidirectional projection. The module distills raw observations into compact decision-relevant states and converts proposed actions into executable transitions. Trained on Terminal-Bench 2.0 and SWE-bench Verified, it matches specialized harnesses while reducing token usage and trajectory length.

Summary generated by Claude — human-verified