Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of disclosing behavioral implications. It mentions appending text but does not describe whether a new paragraph is created, how formatting is handled, if there are size limits, or what the response contains. The mutation is implied but lacks deeper transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.