Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Goes well beyond the annotations: discloses the keyless server-key model, a whitelist that rejects unlisted/HuggingFace ids, rate limiting, and a non-obvious retry behavior for reasoning models that exhaust max_tokens (retried once at 4096). No contradiction with readOnlyHint=true, openWorldHint=true, idempotentHint=false.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.