Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden, but it only states the action without disclosing details like authentication requirements, potential pagination, or the exact nature of 'published'. However, the word 'published' does add a filtering behavior, which is minimal but useful.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.