Long-Horizon Agent Reliability Becomes the Bottleneck

E-Commerce Bench shows that frontier models struggle to sustain economically coherent behavior over a simulated year, while harness, protocol-separation, memory, and embodied-agent evaluations point to continual verification and structured interfaces as key deployment requirements. Robotaxi explanation research further shows the value of causally faithful planner diagnostics, but real-world generalization is still unproven.