This paper introduces MCPVerse, a novel benchmark for evaluating the external tool utilization of large-scale language models (LLMs) that evolve from text generators to inferring agents. MCPVerse integrates over 550 real-world tools, provides a massive action space of over 140,000 tokens, and leverages real-time, answer-based outcome evaluation for time-sensitive tasks. Benchmarking state-of-the-art LLMs in three modes (Oracle, Standard, and Max-Scale) reveals that while most models suffer performance degradation when faced with a larger tool set, agent models such as Claude-4-Sonnet can improve accuracy by leveraging the expanded search space.