{
    "action": "tool_call",
    "reasoning": "My earlier draft cited a table-overview result that is not in the evidence, so I need to run the query before I answer. Row counts per table come from the analytics.table_overview metadata view.",
    "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 and time coverage",
        "source": "raw"
    }
}