Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description bears full responsibility. It only notes that the tool lists 'accessible' spaces, implying authentication-based filtering, but omits details about side effects, rate limits, or whether the list is paginated. The phrase 'Official API' adds minimal behavioral insight.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.