{
    "action": "tool_call",
    "reasoning": "To find the most surprising or counterintuitive finding, I need to explore the data systematically. Let me start by examining the adverse event patterns and treatment arm distributions. I'll look at the gold tables first to see what pre-aggregated insights are available, particularly around adverse events by treatment arm and severity.",
    "tool": "get_gold_tables",
    "args": {}
}