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 states 'update' implies a mutation, but doesn't specify whether this requires authentication, what happens to the old token (e.g., revocation), if changes are immediate or reversible, or any rate limits. For a security-sensitive tool like an API key update, this lack of detail is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.