Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. 'List' implies a read-only, non-destructive operation, and 'collections and their variables' adds structural context. However, it does not clarify whether 'all' includes only local variables or also team/library variables, nor what the response contains.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.