Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden. It discloses the return format (Markdown) and the scope (full text vs summary), which is useful. However, it doesn't disclose potential failure modes (e.g., what happens if the slug doesn't exist), rate limits, or whether the article content is cached or fetched live. For a simple read operation, this is adequate but 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.