{
    "action": "tool_call",
    "reasoning": "My previous draft was prose that I can't back with visible tool results, and its counts were inconsistent: it said 7 categorical dimensions but listed 6, and it ignored the 5 ingestion metadata columns. I'll pull the column metadata so the breakdown of identifier, categorical, numeric and timestamp columns is grounded.",
    "tool": "inspect_columns",
    "args": {
        "table": "bedtime_screentime_sleep_debt",
        "columns": null
    }
}