{
    "action": "tool_call",
    "reasoning": "I have the columns for beer_ratings from step-0, but the question asks for columns across the entire dataset (13 tables). I need to get column metadata for all tables. I'll query the meta.columns table which contains column information for all tables in the dataset.",
    "tool": "query_sql",
    "purpose": "Get all columns across all tables with their types and semantic roles",
    "sql": "SELECT table_name, column_name, phys_type, semantic_role, rough_kind FROM meta.columns ORDER BY table_name, column_name"
}