Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the read-only nature is covered. The description adds a small behavioral detail by mentioning 'remaining time', which implies a computed field, but it does not disclose any other behavioral traits like data source, pagination, or potential latency. It adds some value but not rich context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.