Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations supplied, the description carries the full disclosure burden. It does contribute genuine behavior: the default filter excludes 'new' and results are sorted most-recently-updated first, which an agent could not have inferred. However, it says nothing about pagination, result limits, return shape, or how supplying the status parameter changes the default filter.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.