I need to provide a comprehensive list of all columns across all tables in this dataset, with their data types and meanings. The evidence I already have shows columns from just a few tables (analysis_run_llm_usage, analysis_runs, batches, classification_candidates). I need to get the complete picture across all 51 tables. Let me query the metadata to get all columns with their types and semantic roles, which will tell us what each column means. ```json { "action": "tool_call", "reasoning": "I need to retrieve all columns across all tables in the dataset with their data types and semantic meanings. The meta.columns table contains this information with phys_type (data type), semantic_role (what the column represents), and rough_kind (categorical/numeric/text/temporal). I'll query this to get the complete catalog.", "tool": "query_sql", "args": { "sql": "SELECT table_name, column_name, phys_type AS data_type, semantic_role, rough_kind FROM meta.columns ORDER BY table_name, column_name", "purpose": "Get complete list of all columns with their data types and semantic meanings across all tables" } } ```