{
    "action": "tool_call",
    "reasoning": "I need to determine the time period covered by the dataset. The previous query result in the evidence seems to have returned 'Voicemail' for the min_day, which suggests the 'Day' column might contain non-date strings or headers. I will query the actual values in the 'Day' column to find the valid date range.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT MIN(Day) as min_day, MAX(Day) as max_day, MIN(_ingestion_timestamp) as min_ingest, MAX(_ingestion_timestamp) as max_ingest FROM raw.callyeah_analytics_2026_07_23 WHERE Day != 'Voicemail'",
        "purpose": "Find the time period covered by the dataset, excluding any header rows that might have slipped into the data.",
        "source": "raw"
    }
}