Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint and non-destructive, so safety is covered. The description adds nothing beyond that: it doesn't say whether 'details' include messages, notes, or metadata, nor under what conditions the call fails (unknown convoId, wrong agentId, cross-workspace). For a lookup whose main risk is a wasted/incorrect call, that is a real gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.