```json { "action": "tool_call", "reasoning": "The question asks for columns, their data types, and meanings. The dataset card shows raw.ittf_player_info has 13 columns with basic type info, but I need detailed metadata including semantic descriptions. I'll use inspect_columns to get comprehensive information about all columns in the table.", "tool": "inspect_columns", "args": { "table": "raw.ittf_player_info" } } ```