{
    "action": "tool_call",
    "reasoning": "I need to get the complete list of all 69 columns with their types and semantic roles to provide a comprehensive classification. I'll query the analytics.column_overview metadata table which contains this information for all columns.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT column_name, phys_type, semantic_role FROM analytics.column_overview WHERE table_name = 'epoch_ai_benchmarks' ORDER BY column_name",
        "purpose": "Get complete list of all 69 columns with their types and semantic roles for classification",
        "source": "raw"
    }
}