{
    "action": "tool_call",
    "reasoning": "I have already obtained distinct counts for many categorical columns in steps 1-3, but those results were truncated at 50 rows. I need to get a complete count of distinct values for ALL categorical columns across all tables. I'll write a SQL query that aggregates distinct counts for all columns with rough_kind='categorical' or semantic_role='classifier' from the meta.columns table, which contains the complete metadata.",
    "tool": "query_sql",
    "sql": "SELECT table_name, column_name, phys_type, approx_distinct_count FROM meta.columns WHERE rough_kind = 'categorical' OR semantic_role = 'classifier' ORDER BY table_name, approx_distinct_count DESC",
    "purpose": "Get complete list of all categorical columns with their distinct value counts",
    "source": "raw"
}