{
    "action": "tool_call",
    "reasoning": "No evidence is shown for this turn, so I need to ground the answer by querying the gold table Iris_by_Species, which has per-species aggregates.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM Iris_by_Species",
        "purpose": "Per-species counts and min/avg/median/max of each measurement to see which features separate species",
        "source": "gold"
    }
}