Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden, but it only reveals that a dossier is generated and paths are returned. It does not disclose side effects, whether it mutates session state, idempotency, required permissions, or what 'export paths' refer to.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.