Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered structurally. Beyond that, the description says nothing about matching semantics (substring, token, fuzzy), result ranking, result caps, or whether the search spans the whole corpus or just local blocks, which are the traits an agent would actually need.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.