Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already communicate that this is a read-only, idempotent, non-destructive operation. The description adds that the content is full markdown, but does not discuss behavior for missing slugs or other edge cases; the output schema presumably covers return shape.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.