{
    "action": "tool_call",
    "reasoning": "I have evidence showing industry distribution (63 industries), temporal patterns (34 months), and deal size distribution (69 distinct amounts). Now I need to examine the Valuation column to understand valuation-based segmentation. The previous query failed because Valuation contains both 'na' and 'n/a' values. I'll write a corrected query that handles both null representations and examines the valuation distribution.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT CASE WHEN Valuation IN ('na', 'n/a', '') THEN 'Not disclosed' ELSE 'Disclosed' END AS valuation_status, COUNT(*) AS deal_count, ROUND(COUNT(*) * 100.0 / SUM(COUNT(*)) OVER (), 1) AS pct_of_deals FROM raw.\"Largest US Venture Funding Deals Of 2023\" GROUP BY 1 ORDER BY 2 DESC",
        "purpose": "Determine how many deals have disclosed vs undisclosed valuations to assess valuation as a segmentation dimension",
        "source": "raw"
    }
}