{
    "action": "tool_call",
    "reasoning": "The question asks for natural segmentation of records. I've seen the dataset overview showing columns_catalog dominates with 74.6% of rows, and I have semantic_role/rough_kind distributions for columns_catalog. I should check if other major tables (job_logs, llm_calls, column_tags, tag_lineage_edges) have clear categorical dimensions that would enable meaningful segmentation. Let me start with job_logs since it's the second-largest table at 14.8% of records.",
    "tool": "inspect_columns",
    "args": {
        "table": "job_logs"
    }
}