Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full responsibility for behavioral transparency. It reveals that the tool mutates the document by renaming a page, but does not disclose side effects, such as impact on nested elements or potential name conflicts. No read-only or destructive hints are provided.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.