Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full disclosure burden, yet it says nothing about what the tool returns, whether it reads or mutates anything, or what the operating playbook contains. The only behavioral claims ("no setup," "works in any LLM chatbot") are ambient rather than functional, so an agent still cannot predict the response.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.