{
    "action": "tool_call",
    "reasoning": "No tool results are in my evidence, and my earlier draft cited numbers I can't show. I will recompute the usage correlations from the raw table so the answer rests on a query that actually ran.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS n, corr(Daily_Usage_Hours, Mental_Health_Index) AS usage_vs_mental, corr(Daily_Usage_Hours, Sleep_Duration_Hours) AS usage_vs_sleep_hours, corr(Daily_Usage_Hours, Academic_Performance_GPA) AS usage_vs_gpa, corr(Daily_Usage_Hours, Sleep_Quality_Score) AS usage_vs_sleep_quality, corr(Daily_Usage_Hours, Perceived_Stress_Score) AS usage_vs_stress, corr(Sleep_Duration_Hours, Mental_Health_Index) AS sleep_vs_mental, corr(Perceived_Stress_Score, Mental_Health_Index) AS stress_vs_mental, corr(Academic_Performance_GPA, Mental_Health_Index) AS gpa_vs_mental FROM raw.Social_media_impact_on_life",
        "purpose": "Compute pairwise correlations between daily usage and wellbeing measures across all students",
        "source": "raw"
    }
}