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. It only states what the tool does ('obtiene la lista') but doesn't describe important behavioral aspects: whether this is a read-only operation, what format the list returns, whether there are pagination limits, authentication requirements, or error conditions. For a tool with zero annotation coverage, this is inadequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.