{
    "action": "tool_call",
    "reasoning": "I will use a CTE to find the highest and lowest records for PetalLengthCm, which is widely considered the most discriminative (important) metric in the Iris dataset for classifying species. Using a CTE avoids the syntax error caused by starting the query with parentheses.",
    "tool": "query_sql",
    "args": {
        "purpose": "Find the highest and lowest records for PetalLengthCm",
        "source": "raw",
        "sql": "WITH highest AS (\n    SELECT 'Highest (Petal Length)' as Extremum, Id, Species, PetalLengthCm, PetalWidthCm, SepalLengthCm, SepalWidthCm\n    FROM raw.Iris\n    ORDER BY PetalLengthCm DESC\n    LIMIT 1\n),\nlowest AS (\n    SELECT 'Lowest (Petal Length)' as Extremum, Id, Species, PetalLengthCm, PetalWidthCm, SepalLengthCm, SepalWidthCm\n    FROM raw.Iris\n    ORDER BY PetalLengthCm ASC\n    LIMIT 1\n)\nSELECT * FROM highest\nUNION ALL\nSELECT * FROM lowest"
    }
}