Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, non-destructive, closed-world behavior, but the description adds execution semantics not present there: 'Execution: synchronous' and 'Task support: forbidden'. It also discloses output handling (returned JSON is internal state; use assistantSummary first; never display raw JSON), which is genuine behavioral context beyond structured fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.