{
    "action": "tool_call",
    "reasoning": "The gold table Iris_by_Species holds per-species aggregates of all four measures, so I'll query it directly to compare how well each measure separates the species.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM Iris_by_Species",
        "purpose": "Get per-species aggregates of all four measures to see which varies most across Species",
        "source": "gold"
    }
}