```json { "action": "tool_call", "reasoning": "The question asks me to identify the most important numeric metric. I need to understand what this dataset is about and what its key measures are. The card shows MEASURES: raw.adsl.AGE, raw.adsl.DMDY, raw.adsl.TRTDURD, but I should read the overview insight to understand the dataset's purpose and which metric would be most important in that context.", "tool": "read_insight", "args": { "section": "overview" } } ```