I need to identify columns with missing values and calculate the percentage of missing data for each. Let me query the column metadata to get null counts for all columns in the dataset. ```json { "action": "tool_call", "reasoning": "I'll use inspect_columns to get detailed metadata including null counts for all columns in the titanic table. This will show me which columns have missing values and allow me to calculate the percentage missing.", "tool": "inspect_columns", "args": { "table": "titanic" } } ```