{
    "action": "tool_call",
    "reasoning": "I need to list the columns, their data types, and their meanings. I will join the metadata table `meta.columns` (to get the physical data types) with `raw.data_dictionary` (to get the descriptions/meanings) to provide a complete and accurate table.",
    "tool": "query_sql",
    "args": {
        "purpose": "Get columns, data types, and meanings",
        "source": "raw",
        "sql": "SELECT m.table_name, m.column_name, m.phys_type AS data_type, d.Description AS meaning FROM meta.columns m LEFT JOIN raw.data_dictionary d ON m.table_name = d.Table AND m.column_name = d.Field WHERE m.table_name IN ('accounts', 'products', 'sales_teams', 'b2b_sales_funnel_pipeline') ORDER BY m.table_name, m.column_name"
    }
}