Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It discloses that the cell value and formatting are preserved, which is a key behavioral trait. However, it does not mention potential side effects, permissions, or error conditions, so it's 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.