{
    "action": "tool_call",
    "reasoning": "The evidence shows 4 outcomes for adverse events, but I notice something striking: there are 3 FATAL events marked as serious='N' (not serious), which is counterintuitive since death is by definition the most serious outcome. I need to verify this is real data and not a data quality issue by examining these specific fatal cases to understand if this represents a genuine coding anomaly or has a clinical explanation.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT USUBJID, AETERM, AEDECOD, AESER, AEOUT, AESTDTC, AEENDTC, AEREL FROM raw.ae WHERE AEOUT = 'FATAL' ORDER BY AESTDTC",
        "purpose": "Examine the 3 fatal adverse events to verify they are truly marked as non-serious and understand the context",
        "source": "raw"
    }
}