{
    "action": "tool_call",
    "reasoning": "Check for Simpson's paradox by comparing the overall correlation of sepal length and width with the within-species correlations, using raw rows since gold has no correlations.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT 'ALL' AS grp, COUNT(*) AS n, corr(sepal_length, sepal_width) AS corr_sepal_len_width, corr(petal_length, sepal_width) AS corr_petal_len_sepal_width FROM raw.iris UNION ALL SELECT species, COUNT(*), corr(sepal_length, sepal_width), corr(petal_length, sepal_width) FROM raw.iris GROUP BY species",
        "purpose": "Check for Simpson's paradox: overall vs within-species correlation of sepal length and width",
        "source": "raw"
    }
}