Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It only states 'plain-text search', which hints at input format but does not reveal return behavior, side effects, access requirements, or whether it is read-only. The agent has no information about what happens on a match or no match, pagination, or performance characteristics.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.