Paper: component-level harness design for coding agents on SWE-Bench and Terminal-Bench

The paper “An Empirical Study of Harness Design for Coding Agents” (HF papers/2609.20804) keeps a fixed execution loop and varies planning, action space, and context management across four models on SWE-Bench Verified and Terminal-Bench 2.1 (176 matched settings). Key findings: context management grows more valuable as the window shrinks (mostly by preventing overflow failures); rule-based elision before LLM summarization is the strongest efficiency combo; planning acts as an accuracy scaffold for weaker models and matters less for stronger ones.