Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, non-destructive. The description goes well beyond annotations by disclosing electable and skip_reason behavior, the full list of skip reasons, and the reassurance that a skipped preceding item does not delay yours. This is significant, non-obvious context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.