{
    "action": "tool_call",
    "reasoning": "I've already checked the two largest tables (columns_catalog and job_logs) for exact duplicates and found none. Now I need to check the remaining high-volume tables (llm_calls, column_tags, tag_lineage_edges) and then provide a comprehensive answer about duplicates across the dataset.",
    "tool": "query_sql",
    "purpose": "Check for exact duplicate rows in llm_calls table",
    "args": {
        "sql": "SELECT llm_call_id, model_name, prompt_tokens, completion_tokens, COUNT(*) as duplicate_count FROM raw.llm_calls GROUP BY llm_call_id, model_name, prompt_tokens, completion_tokens HAVING COUNT(*) > 1 LIMIT 50"
    }
}