Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses the action (delete) and the precondition (only completed or failed tasks). However, it does not mention whether deletion is irreversible or if there are any side effects. Given no annotations, the description carries the burden, and it provides adequate but minimal transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.