{
    "action": "tool_call",
    "reasoning": "I need to identify all categorical columns across the dataset and count their distinct values. Starting by querying the metadata to find VARCHAR/TEXT columns which are typically categorical, along with their distinct counts.",
    "tool": "query_sql",
    "purpose": "Get all columns with their types to identify categorical columns",
    "sql": "SELECT table_name, column_name, phys_type, semantic_role, rough_kind, distinct_count, approx_distinct_count FROM analytics.column_overview WHERE phys_type IN ('VARCHAR', 'TEXT') ORDER BY table_name, column_name",
    "source": "raw"
}