Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It transparently states that the tool returns code snippets rather than performing an action, which is useful. However, it does not disclose details like whether the output is a complete file, whether it makes external requests, or how the goal values change the returned wiring.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.