Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It only mentions that it uses `ps` and is fast, but fails to disclose output format (e.g., columns such as PID, command, CPU%, MEM%), whether the limit parameter caps the result count, or any side effects. This leaves the agent guessing about the tool's behavior beyond the basic function.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.