{
    "action": "tool_call",
    "reasoning": "I have partial results showing approximate distinct counts for some categorical columns (language, admin_note, comments, currency, rating_text, user_type). However, the step-0 result shows many more categorical columns across the dataset. I need to get a complete picture by querying all columns with semantic_role='classifier' or rough_kind='categorical' from the column metadata to ensure I capture all categorical columns and their distinct counts.",
    "tool": "query_sql",
    "purpose": "Get complete list of all categorical columns with their distinct counts",
    "sql": "SELECT table_name, column_name, phys_type, approx_distinct_count, distinct_count FROM analytics.column_overview WHERE semantic_role = 'classifier' OR rough_kind = 'categorical' ORDER BY table_name, column_name"
}