Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations available, the description carries the burden. It discloses one key behavioral trait (no payload expansion) and mentions persistence, but does not describe ordering, return fields, or whether the list is limited to a particular scope beyond 'recent.' It adds some useful context but is not comprehensive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.