MCP-Bench: Benchmarking Tool-Using LLM Agents with Complex Real-World Tasks via MCP Servers - Wang, Zhenting; Chang, Qi; Patel, Hemani; Biju, Shashank; Wu, Cheng-En; Liu, Quan; Ding, Aolin; Rezazadeh, Alireza; Shah, Ankit Parag; Bao, Yujia; Siow, Eugene (International Conference on Learning Representations, 2026)