{
    "action": "tool_call",
    "reasoning": "No question text is visible beyond the attempted query, which asks for null counts per column. Use the analytics.column_overview metadata to get null counts and percent missing for every column in one query.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT column_name, null_count, ROUND(100.0 * null_count / 8500, 2) AS pct_missing FROM analytics.column_overview WHERE table_name = 'bedtime_screentime_sleep_debt' ORDER BY null_count DESC, column_name",
        "purpose": "Null counts and percent missing for every column",
        "source": "raw"
    }
}