{
    "action": "tool_call",
    "reasoning": "Fetch the specimens with the highest and lowest petal_length to show the extremes and which species they belong to.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT 'highest' AS extreme, species, petal_length, petal_width, sepal_length, sepal_width FROM raw.iris WHERE petal_length = (SELECT MAX(petal_length) FROM raw.iris) UNION ALL SELECT 'lowest' AS extreme, species, petal_length, petal_width, sepal_length, sepal_width FROM raw.iris WHERE petal_length = (SELECT MIN(petal_length) FROM raw.iris)",
        "purpose": "Show highest and lowest petal_length records",
        "source": "raw"
    }
}