Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and destructiveHint, so the description adds value by explaining the display vs. raw distinction and that the result is formatted. It does not detail formatting behavior or edge cases, but for a simple read tool with strong annotations this is sufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.