Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered externally. The description adds nothing beyond that: no mention of error behavior for unknown ids, whether a missing tasklist falls back to @default, or what the response contains. Even with output schema present, the near-zero contribution from the text keeps this low.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.