{
    "action": "tool_call",
    "reasoning": "PetalLengthCm has the highest eta-squared (0.9413). Retrieve its highest and lowest records with a single WITH/UNION query that starts with SELECT/WITH.",
    "tool": "query_sql",
    "args": {
        "sql": "WITH ranked AS (SELECT Id, Species, PetalLengthCm, PetalWidthCm, SepalLengthCm, SepalWidthCm, ROW_NUMBER() OVER (ORDER BY PetalLengthCm DESC, Id) AS rn_high, ROW_NUMBER() OVER (ORDER BY PetalLengthCm ASC, Id) AS rn_low FROM raw.Iris) SELECT CASE WHEN rn_high <= 5 THEN 'highest' ELSE 'lowest' END AS extreme, Id, Species, PetalLengthCm, PetalWidthCm, SepalLengthCm, SepalWidthCm FROM ranked WHERE rn_high <= 5 OR rn_low <= 5 ORDER BY PetalLengthCm DESC, Id",
        "purpose": "Top 5 and bottom 5 records by PetalLengthCm, the metric with highest eta-squared"
    }
}