Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure, but it only states 'Rename a notebook' without explaining side effects, idempotency, or permission requirements. It lacks any detail about what happens when the tool is invoked, such as whether the title is overwritten or if there are ordering constraints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.