Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide destructiveHint, idempotentHint, and openWorldHint. The description adds a specific behavioral trait: 'Missing names are ignored,' which clarifies the idempotent behavior beyond the annotation. It does not contradict annotations and adds useful context about handling non-existent secrets.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.