Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds useful behavioral context beyond the readOnlyHint: it specifies the aggregation scope (last 24h), the types of data returned, and that the freshness measurement refers to the Peppol Directory export behind every other endpoint. However, it does not detail the output shape or any aggregation quirks, which could matter when an agent interprets the result.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.