Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. It only states the basic write operation ('Add a comment') without revealing any side effects, required permissions, or constraints (e.g., whether duplicates are allowed, or if the comment must be unique).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.