{
    "action": "tool_call",
    "reasoning": "My earlier draft quoted correlation figures that I have no executed query result for in this turn. I need to compute pooled and per-species correlations before I can make the Simpson's paradox claim.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT 'ALL' AS grp, COUNT(*) AS n, corr(sepal_length, sepal_width) AS r_sepal_len_vs_sepal_wid, corr(petal_length, sepal_width) AS r_petal_len_vs_sepal_wid FROM raw.iris UNION ALL SELECT species AS grp, COUNT(*) AS n, corr(sepal_length, sepal_width), corr(petal_length, sepal_width) FROM raw.iris GROUP BY species ORDER BY grp",
        "purpose": "Compare pooled vs within-species correlations to test for a Simpson's paradox",
        "source": "raw"
    }
}