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 but offers minimal information. 'Get all properties' implies a read-only operation, but doesn't specify whether this returns metadata about properties versus actual property values, whether it's paginated, requires authentication, has rate limits, or what format the output takes. For a tool with no annotation coverage, this is insufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.