Ablations show how to evaluate coding-agent harnesses
A paper published on September 26, 2026 reports 176 configurations tested on two benchmarks and describes differing effects from context summarization and explicit planning.
Source: Ablations de harnesses para agentes de programação (arxiv.org). Text prepared with AI from this source.
What happened and what to do
The paper reports 176 ablation configurations evaluated on SWE-Bench and Terminal-Bench. According to the text, rule-based context trimming combined with a short summary outperformed more elaborate retrieval mechanisms. Explicit planning helped weaker models but did not raise the success rate of the models referenced in the excerpt. The paper was published on September 26, 2026.
For a company building coding agents, the practical response is to measure each harness component against tasks representative of its own environment. A team can log results, latency, and cost by configuration, compare context and planning strategies, and track regressions on a dashboard before adopting more complex components.
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