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How Do Agent Harnesses Create Value? Planning Information and Release Control in Stateful LLM Agents

arXiv · AI, language, vision and robotics · article · Sep 17, 2026 · UTC

Agent harnesses supply planning guidance, organize execution, and check completion. We study how these components affect success, erroneous acceptance, and cost in two Retail experiments and an Airline pilot in $τ^2$-bench. The primary comparison pairs prewritten task-specific plans (Fixed) with shuffled policy text matched in word count (Sham), isolating the contribution of guidance content. Across 265 matched cells, Fixed improves oracle-verified success by 7.17 percentage points (90\% task-clustered bootstrap interval, 1.15--13.36 points), with gains concentrated in higher-complexity tasks.

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Evidence & attribution

arXiv · AI, language, vision and robotics · 2026-09-17T14:30:14.000Z
arXiv · Artificial Intelligence · 2026-09-17T14:30:14.000Z

First collected: 2026-09-19T20:26:32.566Z. This is not the publication date.