Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses a key behavioral trait: it does not create an Assembly, and it returns structured issues. However, it does not elaborate on side effects (if any), required permissions, or operational details like rate limits or error behavior. The non-mutating nature is partially implied but not fully explicit.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.