Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden. It usefully reveals that results include a 'literal English gloss', but it does not disclose ordering, determinism, error behavior, pagination, or the full response shape. This is adequate for a simple read operation but incomplete without annotation support.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.