Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations (readOnlyHint, destructiveHint) already establish safety, and the description adds significant behavioral detail: it explicitly lists excluded data (Organization ids, agent prompts, credentials, integration configuration, arbitrary metadata). This goes beyond annotations to set expectations about what the response will not contain, which is valuable for agents.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.