I need to identify categorical columns and count their distinct values. Let me start by getting an overview of the dataset's columns to understand which ones are categorical. ```json { "action": "tool_call", "reasoning": "I need to understand the dataset structure and identify categorical columns. The read_insight overview section will give me a high-level understanding of the dataset's composition and which columns are categorical.", "tool": "read_insight", "args": { "section": "overview" } } ```