Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It explicitly discloses the read-only behavior, which is a key guarantee. However, it does not mention other potential behaviors like authentication requirements or output format, but for a simple show command this is adequate. The read-only disclosure is valuable and not contradicted by any annotation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.