Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare this is not read-only, not open-world, and not destructive. The description adds useful context that undeclared shell commands are invisible and that this is not a blanket approval, but it does not explain what declaration actually does, whether it grants execution rights, or how it interacts with approval workflows.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.