{
    "action": "tool_call",
    "reasoning": "The inspect_columns result shows geographic columns in ip_geo (city, country, country_code, region) and nia_messages (author_geo). I need to check the actual distribution of values across these geographic dimensions. I'll start by querying the ip_geo table to see how records are distributed by country and region, then check nia_messages.author_geo distribution.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT country, region, COUNT(*) as record_count FROM raw.ip_geo GROUP BY country, region ORDER BY record_count DESC LIMIT 50",
        "purpose": "Get distribution of records across countries and regions in ip_geo table",
        "source": "raw"
    }
}