{
    "action": "tool_call",
    "reasoning": "The gold table iris_by_species already holds per-species aggregates for all four measures, so I'll query it directly to compare the metrics across the category.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM iris_by_species",
        "purpose": "Per-species aggregates of all measures to identify which metric varies most across species",
        "source": "gold"
    }
}