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arXiv · 2610.41482

KEEPER: Learning Control-Sufficient Textual Memory for Long-Horizon LLM Agents

Jinkyeong Choi·Chaebin Jeong·Junsung Jeon·Donghyeon Park
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Abstract

Recursive textual memory can carry earlier errors into later updates, yet task performance alone does not establish memory reliability. We define self-consistency bias as the persistence of incorrect claims already present in the incoming memory. We present KEEPER, a comparative analysis of four auxiliary objectives along information-content and update-sensitivity axes within a shared recursive interface, examining how supervision targets relate to agent performance. Among evaluated conditions, reward-related prediction achieve the highest task performance before and after offline reinforcement learning, outperforming joint supervision. A claim-level analysis of one baseline trajectory documents error persistence despite corrective observations. Together, these analyses motivate evaluating error persistence and valid-information retention alongside task outcomes.

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Jinkyeong Choi, Chaebin Jeong, Junsung Jeon, Donghyeon Park. 2026-10-30. KEEPER: Learning Control-Sufficient Textual Memory for Long-Horizon LLM Agents. https://arxiv.org/abs/2610.41482

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