Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must disclose behavioral traits. It only says 'List all conversations' without mentioning whether it is read-only, requires authentication, has pagination, or any side effects. This leaves significant ambiguity about its operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.