Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide no safety hints (all false), so the description carries the burden. It discloses that the operation may consume Influship account or API usage, and specifies the fetched scope (current record plus up to six recent posts). It does not mention rate limits or auth, but the usage warning adds material value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.