Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden and delivers none of it: it does not say whether the body replaces or merges existing fields, what permissions are required, whether the update is reversible, or what happens on a partial payload. For a mutation tool with a free-form nested body, this is a severe gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.