PeakMojo's Green Agent evaluates AI agents on long-horizon, multi-step tasks using multimodal video analysis. Rather than relying solely on final output correctness, our evaluation agent captures and analyzes the full execution trace of a Purple Agent through recorded video — assessing decision quality, task decomposition, error recovery, and goal completion across extended task horizons. This enables evaluation of agent behaviors invisible to text-only or outcome-based benchmarks, particularly for agentic workflows involving tool use, browsing, and computer interaction.