```json { "action": "tool_call", "reasoning": "The question asks for a comprehensive list of all columns across all tables in the dataset, with their data types and meanings. The dataset has 13 tables with many columns. I'll use inspect_columns on each table to get the detailed metadata including types and semantic roles. I'll start with the largest table (beer_ratings) and work through the others systematically.", "tool": "inspect_columns", "args": { "table": "raw.beer_ratings" } } ```