{
    "action": "tool_call",
    "reasoning": "Gold table iris_by_species holds per-species aggregates of all four measures, so I can compare feature separation across species directly from it.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT species, row_count, petal_length__avg, petal_length__min, petal_length__max, petal_width__avg, sepal_length__avg, sepal_width__avg FROM iris_by_species",
        "purpose": "Compare the four measures across species to pick the metric that best separates them",
        "source": "gold"
    }
}