{
    "action": "tool_call",
    "reasoning": "I have no tool results in evidence, so the numbers in my earlier draft are unverified. I'll pull the gold table by primary_bedtime_app to ground the answer. I don't know its columns, so I'll select everything.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM bedtime_screentime_sleep_debt_by_primary_bedtime_app",
        "purpose": "Compare sleep latency, sleep duration and fatigue across bedtime apps",
        "source": "gold"
    }
}