{
    "action": "tool_call",
    "reasoning": "The quality_issues table shows only 3 distinct combinations of kind/severity with very high-level categories ('high_null' and 'other'). The actual quality issue details are in the 'message' field, which contains ~192 distinct values describing specific problems. I need to examine the actual messages to understand what types of data quality issues exist beyond just 'high nulls'.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT message, COUNT(*) as occurrence_count FROM raw.quality_issues GROUP BY message ORDER BY occurrence_count DESC LIMIT 30",
        "purpose": "Get the specific data quality issue messages to understand what types of problems exist (outliers, impossible values, inconsistent formats, mixed units, etc.)",
        "source": "raw"
    }
}