Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds real behavioral detail beyond the annotations: temporary files are deleted and partial recordings are discarded, so the agent knows nothing recoverable is left behind. There is mild tension with destructiveHint=false since files are removed, but these are intermediate artifacts the tool itself created rather than user data, and the deletion is explicitly disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.