Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does well: it discloses the free-tier rate limit (10/day), the auth mechanism (WEB2MD_LICENSE_KEY env var), and the content-stripping behavior. It omits failure modes such as paywalled, private, or script-rendered pages, which is the main remaining gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.