{
    "action": "tool_call",
    "reasoning": "I have evidence on quality_issues (384 'other' medium, 25 'high_null' medium, 8 'high_null' high) and neal_findings (724 findings across 9 kinds). The question asks for a comprehensive view of data-quality issues. I should check if there are other quality-tracking tables or columns that capture impossible values, inconsistent formats, or mixed units. Let me search for tables that might contain validation rules, data type mismatches, or format inconsistencies.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT table_name, COUNT(*) as column_count FROM analytics.column_overview WHERE rough_kind IN ('MIXED', 'INVALID') OR semantic_role LIKE '%invalid%' OR semantic_role LIKE '%mixed%' GROUP BY table_name ORDER BY column_count DESC LIMIT 20",
        "purpose": "Find tables with columns flagged as mixed types or invalid data",
        "source": "raw"
    }
}