{
    "action": "tool_call",
    "reasoning": "The evidence section is empty here, so I can't cite the earlier correlation numbers. I'll recompute them in one query before answering.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS n, ROUND(AVG(Daily_Usage_Hours),2) AS avg_usage_hours, ROUND(CORR(Daily_Usage_Hours, Mental_Health_Index),3) AS usage_vs_mental_health, ROUND(CORR(Daily_Usage_Hours, Perceived_Stress_Score),3) AS usage_vs_stress, ROUND(CORR(Daily_Usage_Hours, Sleep_Duration_Hours),3) AS usage_vs_sleep, ROUND(CORR(Daily_Usage_Hours, Academic_Performance_GPA),3) AS usage_vs_gpa, ROUND(CORR(Sleep_Duration_Hours, Academic_Performance_GPA),3) AS sleep_vs_gpa, ROUND(CORR(Sleep_Quality_Score, Mental_Health_Index),3) AS sleepquality_vs_mental_health FROM raw.Social_media_impact_on_life",
        "purpose": "Recompute the key correlations to ground the three most interesting questions",
        "source": "raw"
    }
}