HyMem: Hierarchical Context Management for Long-Horizon Agents via Information Isolation
This study addresses planning information loss and reasoning degradation in LLM agents during long-horizon tasks caused by context redundancy. We propose a hierarchical context management framework that functionally isolates planning and execution layers, employing independent reasoning modules to prevent subtask contamination of global memory while utilizing structured summarization to maintain long-range coherence. Experimental results demonstrate that this framework achieves Pass@1 scores of 66.7% on GAIA and 61.3% on BrowseComp-Plus, outperforming the strongest baselines by 6.1 and 4.7 percentage points, respectively. These findings confirm that our approach effectively mitigates context bloat and significantly enhances performance on complex, long-horizon tasks.