{
    "action": "tool_call",
    "reasoning": "No query results are visible in the evidence, so I'll recompute missing-value counts (NULL or blank) for all analytic columns in one query to ground the answer.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS total_rows, COUNT(*) - COUNT(NULLIF(TRIM(User_ID),'')) AS User_ID, COUNT(*) - COUNT(NULLIF(TRIM(Age),'')) AS Age, COUNT(*) - COUNT(NULLIF(TRIM(Gender),'')) AS Gender, COUNT(*) - COUNT(NULLIF(TRIM(Country),'')) AS Country, COUNT(*) - COUNT(NULLIF(TRIM(User_Type),'')) AS User_Type, COUNT(*) - COUNT(NULLIF(TRIM(Education_Level),'')) AS Education_Level, COUNT(*) - COUNT(NULLIF(TRIM(Profession),'')) AS Profession, COUNT(*) - COUNT(NULLIF(TRIM(Monthly_Income),'')) AS Monthly_Income, COUNT(*) - COUNT(NULLIF(TRIM(AI_Tool),'')) AS AI_Tool, COUNT(*) - COUNT(NULLIF(TRIM(AI_Purpose),'')) AS AI_Purpose, COUNT(*) - COUNT(NULLIF(TRIM(AI_Usage_Hours_Per_Day),'')) AS AI_Usage_Hours_Per_Day, COUNT(*) - COUNT(NULLIF(TRIM(Tasks_Performed),'')) AS Tasks_Performed, COUNT(*) - COUNT(NULLIF(TRIM(Monthly_AI_Cost),'')) AS Monthly_AI_Cost, COUNT(*) - COUNT(Productivity_Score) AS Productivity_Score, COUNT(*) - COUNT(Accuracy_Rating) AS Accuracy_Rating, COUNT(*) - COUNT(Satisfaction_Score) AS Satisfaction_Score, COUNT(*) - COUNT(NULLIF(TRIM(Time_Saved_Hours_Per_Week),'')) AS Time_Saved_Hours_Per_Week, COUNT(*) - COUNT(NULLIF(TRIM(Work_or_Study_Hours_Per_Day),'')) AS Work_or_Study_Hours_Per_Day, COUNT(*) - COUNT(NULLIF(TRIM(Would_Recommend),'')) AS Would_Recommend FROM raw.AI_Usage_and_Impact_on_Students_and_Professionals",
        "purpose": "Count missing values (NULL or blank) per column across all analytic columns",
        "source": "raw"
    }
}