Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses the core behavior of creating and signing a JWT, which is the primary action. However, it adds little beyond the readOnlyHint annotation; for example, it does not mention that the token includes an expiration timestamp or that signing is a pure function. The annotation covers safety, so the description is adequate but not enriching.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.