Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide readOnlyHint=false and destructiveHint=false, so the description adds value by detailing side effects: image uploads, Gutenberg conversion, featured image generation, and SEO metadata handling. It also clarifies draft vs. live behavior. Slightly more could be said about reversibility or permission requirements, but the core behavior is disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.