Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. While 'obtiene' implies a read operation, the description doesn't specify whether this requires authentication, what happens with invalid IDs, whether it's idempotent, or what format the response takes. For a read tool with zero annotation coverage, this leaves significant behavioral questions unanswered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.