```json { "action": "tool_call", "reasoning": "The dataset card shows raw.callyeah_analytics_2026_07_23 has 14 columns, all typed as VARCHAR except _ingestion_timestamp (TIMESTAMP). To classify them properly as identifiers, dimensions, metrics, or dates/times, I need detailed metadata including semantic roles, null counts, distinct counts, and value ranges. I'll use inspect_columns to get this information for all columns in the table.", "tool": "inspect_columns", "args": { "table": "callyeah_analytics_2026_07_23" } } ```