Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It reveals that grouping commas and currency are handled, and non-numeric rows are excluded and counted, which is useful preprocessing context. However, it does not mention error cases or output format, which would be helpful but not critical for a simple statistics tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.