Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. 'List XProfile fields' implies a read operation but doesn't specify whether this requires authentication, what permissions are needed, whether results are paginated, or what format the output takes. For a tool with zero annotation coverage, this is insufficient - it doesn't describe the tool's behavior beyond the basic action.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.