{
    "action": "tool_call",
    "reasoning": "I already have the breakdown for Sex. Now I need to get the most common values for the other main categorical columns: Pclass, Survived, Cabin, Parch, and Embarked. I'll query each separately since UNION ALL failed.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT Pclass, COUNT(*) as frequency, ROUND(100.0 * COUNT(*) / SUM(COUNT(*)) OVER (), 1) as percentage FROM raw.titanic WHERE Pclass IS NOT NULL GROUP BY Pclass ORDER BY frequency DESC",
        "purpose": "Get distribution of Pclass values",
        "source": "raw"
    }
}