{
    "action": "tool_call",
    "reasoning": "I have hourly LLM call data with cost and latency metrics. I can see some patterns in the evidence (e.g., zero-cost periods, latency spikes), but I need to look at the full time series to identify all notable spikes, dips, and breaks. Let me query the complete hourly trend to get a comprehensive view of the temporal patterns.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT created_at__yyyy_mm_dd_hh, row_count, cost_usd__sum, latency_ms__avg FROM gold.llm_calls_by_created_at__yyyy_mm_dd_hh ORDER BY created_at__yyyy_mm_dd_hh",
        "purpose": "Get complete hourly time series of LLM calls to identify all spikes, dips, and breaks in volume, cost, and latency",
        "source": "gold"
    }
}