Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden: it discloses the core effect (read-only, blocks inserts) and the return shape ('ok/error status object'), which is helpful since no output schema exists. It does not address reversibility, required permissions, whether existing data or other write operations (updates/deletes) are affected, or error conditions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.