Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the description adds real value beyond them: it states source code is never returned (a security/data-scope constraint) and that names are user-defined text. It also implies access scoping via 'permitted project'. Pagination behavior past the first page is not described.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.