{
    "action": "tool_call",
    "reasoning": "Compute null counts and percent missing per column from the profiling metadata view, which holds null_count for each column.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT column_name, null_count, ROUND(100.0 * null_count / 4500, 2) AS pct_missing FROM analytics.column_overview WHERE table_name = 'Social_media_impact_on_life' ORDER BY null_count DESC, column_name",
        "purpose": "Null count and percent missing per column",
        "source": "raw"
    }
}