Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide some hints (not read-only, not destructive, not idempotent). The description adds extensive behavioral details: full write gates (karma, extension, size, quota, file-count), error list, authentication requirement, rate limit (60 ops/hour), and that a new dst gets fresh created_at. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.