{
    "action": "tool_call",
    "reasoning": "To get the meaning of each column, I will query the analytics.column_overview table which contains semantic roles and descriptions for all columns in the raw.ae table.",
    "tool": "query_sql",
    "args": {
        "purpose": "Get column descriptions and semantic roles",
        "source": "raw",
        "sql": "SELECT column_name, phys_type, semantic_role, rough_kind FROM analytics.column_overview WHERE table_name = 'ae' ORDER BY column_name"
    }
}