Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden, and it discloses almost nothing: it does not say what is returned, whether the output is static prompt text or generated content, or how the optional query changes behavior. The claims "No setup, works in any LLM chatbot" are marketing assertions rather than behavioral facts an agent can act on.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.