{
    "action": "tool_call",
    "reasoning": "I found temporal columns in step-0, and step-2 showed gold tables with temporal aggregations. The error in step-4 revealed that gold tables need source='gold' in query_sql. Let me query the gold table for llm_calls temporal patterns to find spikes/dips.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM llm_calls_by_created_at__yyyy_mm_dd_hh ORDER BY created_at__yyyy_mm_dd_hh",
        "purpose": "Get hourly LLM call volumes to identify spikes and dips",
        "source": "gold"
    }
}