I am a PhD candidate in the School of Computing at National University of Singapore (NUS), advised by Prof. Bryan Hooi. Prior to that, I received my Master’s degree at Beijing University of Posts and Telecommunications, jointly advised by Prof. Chuan Shi and Prof. Xiao Wang. My research interests include Large Language Models, self-evolving Agents.
🔥 News
- 2026.04: Two accepted by ICML 2026
- 2026.01: One paper accepted by ICLR 2026
📝 Publications
Just-In-Time Reinforcement Learning: Continual Learning in LLM Agents Without Gradient Updates
Yibo Li, Zijie Lin, Ailin Deng, Xuan Zhang, Yufei He, Shuo Ji, Tri Cao, Bryan Hooi
ICML 2026 🌟 Spotlight (Top 2.2%)
Memory is Reconstructed, Not Retrieved: Graph Memory for LLM Agents
Shuo Ji, Yibo Li, Bryan Hooi
ICML 2026
APEX: Autonomous Policy Exploration for Self-Evolving LLM Agents
Yibo Li, Jiashuo Yang, Zhi Zheng, Zhiyuan Hu, Yuan Sui, Shizun Wang, Yufei He, Bryan Hooi
Preprint
WARD: Adversarially Robust Defense of Web Agents Against Prompt Injections
Tri Cao, Yulin Chen, Hieu Cao, Yibo Li, Khoi Le, Thong Nguyen, Yuexin Li, Yufei He, Yue Liu, Shuicheng Yan, Bryan Hooi
Preprint
TACT: Mitigating Overthinking and Overacting in Coding Agents via Activation Steering
Yuan Sui, Yulin Chen, Yibo Li, Xue Jiang, Yufei He, Yihong Dong, Xiaoxin He, Tianyu Gao, Bryan Hooi
Preprint
WebAgentGuard: A Reasoning-Driven Guard Model for Detecting Prompt Injection Attacks in Web Agents
Yulin Chen, Tri Cao, Haoran Li, Yue Liu, Yibo Li, Yufei He, Le Minh Khoi, Yangqiu Song, Shuicheng Yan, Bryan Hooi
Preprint
Learning to Learn-at-Test-Time: Language Agents with Learnable Adaptation Policies
Zhanzhi Lou, Hui Chen, Yibo Li, Qian Wang, Bryan Hooi
Preprint
Qianyun Guo, Yibo Li, Yue Liu, Bryan Hooi
Preprint
GuardReasoner-Omni: A Reasoning-based Multi-modal Guardrail for Text, Image, and Video
Zhenhao Zhu, Yue Liu, Yanpei Guo, Wenjie Qu, Cancan Chen, Yufei He, Yibo Li, Yulin Chen, Tianyi Wu, Huiying Xu, Xinzhong Zhu, Jiaheng Zhang
Preprint
Yufei He, Juncheng Liu, Zhiyuan Hu, Yulin Chen, Yue Liu, Yuan Sui, Yibo Li, Nuo Chen, Jun Hu, Bryan Hooi, Xinxing Xu, Jiang Bian
Preprint
EvoTest: Evolutionary Test-Time Learning for Self-Improving Agentic Systems
Yufei He, Juncheng Liu, Yue Liu, Yibo Li, Tri Cao, Zhiyuan Hu, Xinxing Xu, Bryan Hooi
ICLR 2026
ConfTuner: Training Large Language Models to Express Their Confidence Verbally
Yibo Li, Miao Xiong, Jiaying Wu, Bryan Hooi
NeurIPS 2025
MLR-Bench: Evaluating AI Agents on Open-Ended Machine Learning Research
Hui Chen, Miao Xiong, Yujie Lu, Wei Han, Ailin Deng, Yufei He, Jiaying Wu, Yibo Li, Yue Liu, Bryan Hooi
NeurIPS 2025
AuCoGNN: Enhancing Graph Fairness Learning under Distribution Shifts with Automated Graph Generation
Xiao Wang, Yibo Li, Yujie Xing, Shaohua Fan, Chuan Shi
TKDE 2025
Advancing Molecular Graph-Text Pre-training via Fine-grained Alignment
Yibo Li, Yuan Fang, Mengmei Zhang, Chuan Shi
KDD 2025
Graph foundation models: Concepts, opportunities and challenges
Jiawei Liu, Cheng Yang, Zhiyuan Lu, Junze Chen, Yibo Li, Mengmei Zhang, Ting Bai, Yuan Fang, Lichao Sun, Philip S. Yu, Chuan Shi
TPAMI 2025
Graph Fairness Learning under Distribution Shifts
Yibo Li, Xiao Wang, Yujie Xing, Shaohua Fan, Ruijia Wang, Yaoqi Liu, Chuan Shi
WWW 2024
A Generalized Neural Diffusion Framework on Graphs
Yibo Li, Xiao Wang, Hongrui Liu, Chuan Shi
AAAI 2024
Less is More: on the Over-Globalizing Problem in Graph Transformers
Yujie Xing, Xiao Wang, Yibo Li, Hai Huang, Chuan Shi
ICML 2024 🗣️ Oral
Towards adaptive information fusion in graph convolutional networks
Meiqi Zhu, Xiao Wang, Chuan Shi, Yibo Li, Junping Du
TKDE 2023
Tianyu Zhao, Cheng Yang, Yibo Li, Quan Gan, Zhenyi Wang, Fengqi Liang, Huan Zhao, Yingxia Shao, Xiao Wang, Chuan Shi
SIGIR 2022
🎖 Honors and Awards
- 2022.07 Outstanding Graduate Student Award of Beijing
- 2023.10 The University’s First-Class Scholarship
📖 Educations
- 2025.08 - now, PhD candidate in School of Computing, National University of Singapore, Singapore
- 2022.09 - 2025.06, Postgraduate in the School of Computer Science, Beijing University of Posts and Telecommunications, Beijing, China
- 2018.09 - 2022.06, Undergraduate in the School of Computer Science, Beijing University of Posts and Telecommunications, Beijing, China
💻 Internships
- 2023.10 - 2024.03, Singapore Management University, Singapore