```json { "action": "tool_call", "reasoning": "I need to get a comprehensive list of all columns across all tables with their data types and meanings. The evidence so far shows only the first 50 columns. Let me query the metadata to get the complete picture.", "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 across all tables with their data types and semantic meanings" } ```