Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('Post') which implies a write operation, but doesn't cover important aspects like authentication requirements, rate limits, error conditions, whether comments are editable after creation, or what happens on success. The description is minimal and leaves critical behavioral traits unspecified.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.