Harness Handbook: Making Evolving Agent Harnesses Readable,Navigable, and Editable
- Published
- Source
- arXiv
- Paper number
- 644
- Field
- AI / General
- arXiv ID
- 2607.13285
Key points
- It defines the behavior localization problem as finding where in the code a behavior described by a change request is implemented.
- Harness Handbook reorganizes code by behavior rather than by file or function, and links each behavior directly to source code.
- Behavior-Guided Progressive Disclosure (BGPD) guides exploration step by step from high-level behavior descriptions to relevant implementation details.
- On two open-source harnesses, Codex and Terminus-2, it outperforms the baselines with win rates of 38.3% and 45.6%, compared with 28.3% and 26.7%.
- It delivers especially large gains on multi-file edits, rarely executed code paths, and interactions across modules.
Paper links
External research summaries. These are not HDATF publications or measured product results.