Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses key behavioral details: only open/unchecked items are returned, only unarchived notes are included, and each result carries note ID and title. It does not state whether the operation is read-only or if there are side effects, but the verb 'Get' and the suggestion to check off items afterwards imply a safe read. This is more transparent than many tool descriptions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.