{
    "action": "tool_call",
    "reasoning": "I need to get a comprehensive view of all columns across all tables to classify them properly. The evidence so far shows metadata queries that returned 50 rows (truncated), but I need the complete picture. I'll query the meta.columns table to get all columns with their physical types and semantic roles, which will allow me to classify them into identifiers, categorical dimensions, numeric metrics, and dates/times.",
    "tool": "query_sql",
    "sql": "SELECT table_name, column_name, phys_type, semantic_role, rough_kind FROM meta.columns ORDER BY table_name, column_name",
    "purpose": "Get complete column metadata across all tables to classify by type"
}