Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden but only states the action without behavioral details. It doesn't disclose permissions needed, whether archiving is reversible (though 'unarchive_document' exists), rate limits, or what happens to archived documents (e.g., moved to a list accessible via 'list_archived_documents').
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.