Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of explaining behavior. It clearly states the transformation from HTML to markdown/headings, which is the core behavior. However, it does not disclose any limitations, error conditions, or performance characteristics, so it partially meets the need.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.