{
    "action": "tool_call",
    "reasoning": "I need an executed result to ground the dataset size and shape. I'll pull the row and column counts for all five tables from the overview metadata.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT table_name, row_count, column_count FROM analytics.table_overview ORDER BY row_count DESC",
        "purpose": "Row and column counts per monthly table",
        "source": "raw"
    }
}