{
    "action": "tool_call",
    "reasoning": "I will query the data dictionary and join it with the column metadata to provide a complete list of columns, their data types, and their meanings, which will render as a table for the user.",
    "tool": "query_sql",
    "args": {
        "purpose": "List columns, data types, and meanings",
        "source": "raw",
        "sql": "SELECT d.\"Table\" AS table_name, d.\"Field\" AS column_name, c.phys_type AS data_type, d.\"Description\" AS meaning FROM raw.data_dictionary d LEFT JOIN meta.columns c ON d.\"Table\" = c.table_name AND d.\"Field\" = c.column_name ORDER BY d.\"Table\", d.\"Field\""
    }
}