Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
There are no annotations, so the description carries the full disclosure burden. It clearly says the tool generates URLs/IIIF links and documents defaults, but it does not explicitly state that the operation is read-only, what happens on invalid input, or whether any network request is made to resolve the image. That is acceptable for a simple URL-generation tool but not fully transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.