{
    "action": "tool_call",
    "reasoning": "I have survival by sex showing a dramatic 74.2% survival rate for females vs 18.9% for males. Now I need to check survival by passenger class to compare which categorical variable shows the stronger relationship with survival. This will let me determine whether Sex or Pclass is the 'most important category'.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT Pclass, Survived, row_count, ROUND(100.0 * row_count / SUM(row_count) OVER (PARTITION BY Pclass), 1) as pct_within_class FROM titanic_by_Pclass_Survived ORDER BY Pclass, Survived",
        "purpose": "Calculate survival rates by passenger class to compare with sex-based survival rates",
        "source": "gold"
    }
}