{
    "action": "tool_call",
    "reasoning": "I have evidence showing llm_calls contains cost_usd as a key metric with a wide range (0.0 to 1.696842). I've seen the extremes, but I should verify if there are other important numeric metrics across the dataset. Let me check the columns_catalog table (the largest table at 74.6% of rows) to see what metrics it tracks, as it may contain more business-critical measures than LLM costs.",
    "tool": "inspect_columns",
    "args": {
        "table": "columns_catalog"
    }
}