Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint and openWorldHint, setting a low bar. The description adds that details include 'tabs and lists', which is useful content context, but it does not disclose other behavioral aspects like error handling or permission requirements. It adds some value beyond annotations but is not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.