Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations available, the description carries the full burden and does so thoroughly: link decay uses a 90-day half-life, links below 0.01 are deleted, episodic memories are archived to memory_historica, and excluded categories are enumerated. It also explicitly warns that dry_run=False executes changes.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.