Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the full burden of behavioral disclosure. It essentially restates the tool's function without revealing any additional behavior such as return format, pagination, or case sensitivity. The schema notes 'exact match' but the description itself adds no such context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.