Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden but provides minimal behavioral information. It doesn't disclose whether this is a read-only operation, what happens if no elements exist, performance characteristics, or what format the text content is returned in. The phrase 'all elements' is vague without context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.