Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden and does substantial work: it discloses the link is revocable, expiresAt is optional, the WiFi password is never embedded in Markdown but unlocked within 150 m of coordinates, and Bearer auth is required. It does not cover side effects on existing shares or error/return behavior, so it is not exhaustive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.