Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It mentions the input (retrieval history) and the formula (median survival span -> decay rate), but does not disclose whether this mutates the system's memory parameters, requires any prerequisites, or what side effects may occur. This is a significant transparency gap for a calibration operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.