{
    "action": "tool_call",
    "reasoning": "The evidence section is empty, so none of my earlier figures are backed by a tool result in this turn. I'll re-query the per-species gold table to ground the petal_length claims before answering.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT species, row_count, petal_length__avg, petal_length__min, petal_length__max, petal_length__median, sepal_width__avg, sepal_width__min, sepal_width__max FROM iris_by_species ORDER BY petal_length__avg",
        "purpose": "Compare per-species petal_length and sepal_width ranges to judge which feature separates species best",
        "source": "gold"
    }
}