Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. It states the action ('changes canvas size') which implies a mutation, but doesn't disclose whether this is destructive to existing content, requires specific permissions, has side effects, or what happens to objects outside the new bounds. For a mutation tool with zero annotation coverage, this is inadequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.