Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. "Fetch" implies a read-only operation and the return contents are mentioned (metadata and chunk texts), but there is no explicit statement about side effects, permissions, rate limits, pagination, or error behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.