Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It explicitly discloses that the tool returns 'undone tasks' and only from 'every active project', which are important behavioral constraints. This goes beyond simply restating the name. It stops short of describing return format or pagination, but for a simple read-only list tool, this is adequate and useful.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.