{
    "action": "tool_call",
    "reasoning": "Count distinct values for each categorical (VARCHAR/classifier) column in one query.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS total_rows, COUNT(DISTINCT user_id) AS user_id, COUNT(DISTINCT gender) AS gender, COUNT(DISTINCT occupation_type) AS occupation_type, COUNT(DISTINCT chronotype) AS chronotype, COUNT(DISTINCT primary_bedtime_app) AS primary_bedtime_app, COUNT(DISTINCT sleep_debt_category) AS sleep_debt_category, COUNT(DISTINCT blue_light_filter_active) AS blue_light_filter_active FROM raw.bedtime_screentime_sleep_debt",
        "purpose": "Distinct counts for categorical columns",
        "source": "raw"
    }
}