{
    "action": "tool_call",
    "reasoning": "Get value frequencies for Species and the metadata categorical columns in one query.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT 'Species' AS column_name, Species AS value, COUNT(*) AS freq, ROUND(100.0*COUNT(*)/150,1) AS pct FROM raw.Iris GROUP BY Species UNION ALL SELECT '_source_system', _source_system, COUNT(*), ROUND(100.0*COUNT(*)/150,1) FROM raw.Iris GROUP BY _source_system UNION ALL SELECT '_source_file', _source_file, COUNT(*), ROUND(100.0*COUNT(*)/150,1) FROM raw.Iris GROUP BY _source_file UNION ALL SELECT '_batch_id', _batch_id, COUNT(*), ROUND(100.0*COUNT(*)/150,1) FROM raw.Iris GROUP BY _batch_id ORDER BY column_name, freq DESC",
        "purpose": "Value frequencies for Species and the metadata categorical columns",
        "source": "raw"
    }
}