This green assessor agent is designed to evaluate an agent’s ability to perform realistic, end-to-end physics analysis workflows. Rather than focusing on isolated reasoning or coding tasks, it assesses whether an agent can explore real experimental data, extract meaningful physical quantities, and produce scientifically valid results. The evaluation is structured into three complementary components. First, a **hard check** verifies the presence of required physical observables; if the target quantities are not produced, the task receives zero score. Second, a **rule-based evaluation** applies deterministic, physics-motivated criteria to ensure reproducibility and objective correctness. Finally, an **LLM-based reasoning judge** evaluates the methodological soundness and analysis logic, allowing controlled flexibility in assessing scientifically reasonable approaches. The current benchmark task focuses on reconstructing the Z boson mass from di-muon events by exploring ROOT files and performing a peak fit. Other tasks will be evaluated in Phase 2. The green agent is designed to be extensible, enabling additional analysis tasks to be incorporated under the same multi-layer evaluation framework.