Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark this as a safe, read-only, idempotent operation. The description adds behavioral context by specifying the post's content blocks, categories, and tags, which clarifies the granularity of the response. There is no contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.