Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the behavioral burden. It discloses the HTTP method (GET, implying read-only) and meaningful auth behavior ('BYOK fail-closed'). It does not describe return values or error behavior, but these are less critical for a simple retrieval tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.