```json { "action": "tool_call", "reasoning": "The evidence shows only 50 rows from what seems to be a partial column listing. I need to query the complete column metadata from meta.columns to get all columns across all tables with their types and semantic roles. I'll select the essential fields: table, column name, physical type, and semantic role which indicates what each column means.", "tool": "query_sql", "sql": "SELECT table_name, column_name, phys_type AS data_type, semantic_role, rough_kind FROM meta.columns ORDER BY table_name, column_name", "purpose": "Get complete list of all columns with their data types and semantic meanings" } ```