Long-Horizon LLM Agents

LLM: Large Language Model

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60 papers in the last four weeks, up 161% on the four weeks before. 0.6% of all new papers.

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HarnessBridge: Learnable Bidirectional Controller for LLM Agent Harness
Jun 11, 2026Xiaoxuan Wang, Haixin Wang, Alexander Taylor +3Agent Harness Optimization LLM Agent Training
University of California, Los Angeles
WISE: A Long-Horizon Agent in Minecraft with Why-Which Reasoning
Jun 11, 2026Renmin Cheng, Changhao ChenCausal Reasoning Long-Horizon Agent Tasks
The Hong Kong University of Science and Technology · The Hong Kong University of Science and Technology (Guangzhou)
Toward Generalist Autonomous Research via Hypothesis-Tree Refinement
Jun 10, 2026Jiajie Jin, Yuyang Hu, Kai Qiu +15Long-Horizon LLM Agents Autonomous Experimentation
Gaoling School of Artificial Intelligence, Renmin University of China · Microsoft Research
Goal-Autopilot: A Verifiable Anti-Fabrication Firewall for Unattended Long-Horizon Agents
Jun 10, 2026Youwang DengAI Agent Reliability LLM Hallucination Mitigation
EpistemicaLab — Independent Research
ISE: An Execution-Grounded Recipe for Multi-Turn OS-Agent Trajectories
Jun 9, 2026Siyuan Luo, Nairong Zheng, Lin Zhou +6Synthetic Data Generation Tool-Using Agents
University of Electronic Science and Technology of China · SenseTime Research
Learning What to Remember: Observability-Safe Memory Retention via Constrained Optimization for Long-Horizon Language Agents
Jun 9, 2026Qingcan Kang, Liu Mingyang, Shixiong Kai +3Stochastic Optimization Long-Horizon LLM Agents
Department of Industrial Engineering and Decision Analytics, Hong Kong University of Science and Technology · Department of Computer Science, City University of Hong Kong · Huawei Noah’s Ark Lab
ActiveMem: Distributed Active Memory for Long-Horizon LLM Reasoning
Jun 9, 2026Yunhan Jiang, Wenbin Duan, Shasha Guo +3Long-Horizon LLM Agents Agent Memory Management
State Key Laboratory of AI Safety, Institute of Computing Technology, Chinese Academy of Sciences · University of Chinese Academy of Sciences
HIPIF: Hierarchical Planning and Information Folding for Long-Horizon LLM Agent Learning
Jun 9, 2026Juncheng Diao, Zhicong Lu, Peiguang Li +6Hierarchical RL Long-Horizon LLM Agents
1Meituan · University of Chinese Academy of Sciences
Less Context, Better Agents: Efficient Context Engineering for Long-Horizon Tool-Using LLM Agents
Jun 8, 2026Abhilasha Lodha, Mahsa Pahlavikhah Varnosfaderani, Abir Chakraborty +1LLM Inference Efficiency Tool-Augmented Language Model Agents
Microsoft
SearchSwarm: Towards Delegation Intelligence in Agentic LLMs for Long-Horizon Deep Research
Jun 8, 2026Pu Ning, Quan Chen, Kun Tao +7Multi-Agent LLM Systems LLM Agent Orchestration
Tsinghua University · Peking University · Ant Group +1
Can the Environment Speak for Itself? $T^{2}$ -GRPO: A Turn-Trajectory Group Relative Policy Optimization for Caregiver Agents
Jun 7, 2026Yutong Song, Jiang Wu, Pengfei Zhang +4Reward Shaping Healthcare
University of California, Irvine · Independent Researcher · Kennesaw State University
Benchmarking Open-Ended Multi-Agent Coordination in Language Agents
Jun 6, 2026Kale-ab Abebe Tessera, Andras Szecsenyi, Cameron Barker +7Multi-Agent Coordination LLM Agent Evaluation
University of Edinburgh · University of Oxford · University College London
To Nuke or Not to Nuke: LLMs' (Missing) Ethical Reasoning and Actions in a High-Stakes Decision-Making Simulation
Jun 6, 2026John Chen, Sihan Cheng, Can Gurkan +1Moral Reasoning in Language Models LLM Agent Evaluation
University of Arizona, Tucson, AZ, USA · Northwestern University, Evanston, IL, USA
IntentKV: Cross-Turn Intent-Aware KV Cache Pruning for Agent Inference
Jun 6, 2026Junjie Li, Jiong Lou, Jie LiKV Caching KV-Cache Management
Shanghai Jiao Tong University
Silent Failure in LLM Agent Systems: The Entropy Principle and the Inevitable Disorder of Autonomous Agents
Jun 6, 2026Dexing LiuAgent Failure Analysis AI Agent Governance
Shanghai Qijing Digital Technology Co., Ltd.
VideoWeaver: Evaluating and Evolving Skills for Agentic Long Video Generation
Jun 6, 2026Jianhui Wei, Yan Zhang, Jie Tan +7Long Video Generation Agentic Video Generation
Zhejiang University · ByteDance
Agentopia: Long-Term Life Simulation and Learning in Agent Societies
Jun 5, 2026Xintao Wang, Sirui Zheng, Hongqiu Wu +10Multi-Agent LLM Systems Human Behavior Simulation
Fudan University · Independent Researcher · Johns Hopkins University +1
Signal-Driven Observation for Long-Horizon Web Agents
Jun 4, 2026Shubham Gaur, Ian LaneActive Perception Long-Horizon LLM Agents
Department of Computer Science and Engineering, University of California, Santa Cruz, CA, USA.
Agent Memory: Characterization and System Implications of Stateful Long-Horizon Workloads
Jun 4, 2026Yasmine Omri, Ziyu Gan, Zachary Broveak +6Agent Memory LLM Agent Memory
Stanford University · Independent Researcher · MICAS, KU Leuven +1
Beyond Semantic Organization: Memory as Execution State Management for Long-Horizon Agents
Jun 4, 2026Yaoqi Chen, Haibin Lai, Yuru Feng +12Agent Memory Long-Horizon LLM Agents
University of Science and Technology of China · Microsoft · University of California, San Diego +1
Evolving Agents in the Dark: Retrospective Harness Optimization via Self-Preference
Jun 4, 2026Wenbo Pan, Shujie Liu, Chin-Yew Lin +5Software Engineering Agents Agent Harness Optimization
City University of Hong Kong · Microsoft Research Asia
AdaMEM: Test-Time Adaptive Memory for Language Agents
Jun 4, 2026Yunxiang Zhang, Yiheng Li, Ali Payani +1Agent Memory Test-Time Adaptation
University of Michigan · 2Cisco Research.
Personal AI Agent for Camera Roll VQA
Jun 3, 2026Thao Nguyen, Krishna Kumar Singh, Donghyun Kim +2Visual Question Answering Long-Horizon LLM Agents
University of Wisconsin-Madison · Adobe Research · Korea University
Multi $^2$ : Hierarchical Multi-Agent Decision-Making with LLM-Based Agents in Interactive Environments
Jun 2, 2026Sangeun Park, Minhae KwonMulti-Agent LLM Systems Hierarchical RL
Department of Electrical and Computer Engineering, Sungkyunkwan University, Republic of Korea.
MemTrain: Self-Supervised Context Memory Training
Jun 2, 2026Ziheng Li, Xingrun Xing, Haoqing Wang +2LLM Agent Memory Persistent Memory for Language Models
State Key Laboratory of General Artificial Intelligence, School of Intelligence Science and Technology, Peking University · Samsung Research, Beijing, China
WRIT: Write-Read Intensive Trajectory Synthesis for Multi-Turn User-Facing Agents
Jun 1, 2026Hengrui Gu, Xiaotian Han, Kaixiong ZhouTool-Augmented Language Model Agents Tool-Using Agents
North Carolina State University · Case Western Reserve University
CoMAP: Co-Evolving World Models and Agent Policies for LLM Agents
Jun 1, 2026Youwei Liu, Jian Wang, Hanlin Wang +1LLM World Models LLM Agent Training
Central South University · College of Computer Science, Sichuan University · Department of Computing, The Hong Kong Polytechnic University
SIRI: Self-Internalizing Reinforcement Learning with Intrinsic Skills for LLM Agent Training
Jun 1, 2026Zhongyu He, Yuanfan Li, Fei Huang +9LLM Agent Skill Learning Long-Horizon LLM Agents
Xiamen University · Meituan · Macao Polytechnic University
SkillAdaptor: Self-Adapting Skills for LLM Agents from Trajectories
May 31, 2026Zhuoyun Yu, Xin Xie, Wuguannan Yao +4LLM Agent Skill Learning Long-Horizon LLM Agents
♠Zhejiang University · ♣Ant Digital Technologies, Ant Group · ♢Zhejiang University - Ant Group Joint Laboratory of Knowledge Graph +1
CoMIC: Collaborative Memory and Insights Circulation for Long-Horizon LLM Agents in Cloud-Edge Systems
May 30, 2026Yannan Wang, Longli Yang, Zhen Liu +2LLM Agent Memory Edge Computing
Beijing Jiaotong University · WMG, University of Warwick · The Alan Turing Institute +2

Jun 11, 2026, cs.AIJ/K move · Enter open · S save

HarnessBridge: Learnable Bidirectional Controller for LLM Agent Harness

Xiaoxuan Wang, Haixin Wang, Alexander Taylor, Jason Cong+2

University of California, Los Angeles

Agent Harness Optimization LLM Agent Training Long-Horizon LLM Agents LLM Agent Harnesses

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Large language models are increasingly deployed as agents for long-horizon tasks, yet their performance is shaped not only by model capability and environment design, but also by the harness that mediates agent--environment interaction. Existing harnesses are largely manually engineered, making them difficult to scale as trajectories grow longer and interactions become more complex. In this work, we ask whether harness can be generated by a learnable plug-in module that can be trained in an end-to-end fashion. We introduce HarnessBridge, a lightweight learnable harness controller that parameterizes the agent--environment interface as a bidirectional projection. HarnessBridge learns two bidirectional projections: observation projection, which distills raw trajectories into compact, decision-relevant states, and action projection, which converts proposed actions into executable transitions or trajectory-grounded rejections. We train HarnessBridge on a harness supervision dataset via unified instruction tuning. On Terminal-Bench~2.0 and SWE-bench Verified, HarnessBridge matches or surpasses strong specialized harnesses while substantially reducing token usage and trajectory length, and generalizes from smaller generators to larger commercial models.

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