{
    "action": "tool_call",
    "reasoning": "To find the most surprising finding, I need to look for patterns that violate clinical trial expectations. Let me start by examining the adverse event severity and relationship patterns, as well as treatment arm distributions. I'll check for unexpected imbalances or anomalies in the safety data.",
    "tool": "query_sql",
    "purpose": "Examine adverse event severity distribution and relationship to study drug across treatment arms",
    "args": {
        "sql": "SELECT AEREL, AESEV, COUNT(*) as event_count, COUNT(DISTINCT USUBJID) as subject_count FROM raw.ae WHERE AEREL IS NOT NULL AND AESEV IS NOT NULL GROUP BY AEREL, AESEV ORDER BY event_count DESC",
        "source": "raw"
    }
}