Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full burden of disclosing side effects. It transparently states that 'Output is not captured' and that the tool is refused under a specific condition, which are important behavioral traits. It does not mention other potential side effects (e.g., persistence or state changes), but the disclosed information is valuable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.