{
    "action": "tool_call",
    "reasoning": "No evidence is visible in this turn, so I'll re-ground the size and column counts from the metadata overview before answering.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT table_name, row_count, column_count FROM analytics.table_overview ORDER BY row_count DESC",
        "purpose": "Get row and column counts for each table to describe dataset size",
        "source": "raw"
    }
}