Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds the side effect of commission calculation beyond what annotations provide (annotations show destructiveHint=false and readOnlyHint=false, but this is a mutation). However, it does not disclose potential irreversibility or other behavioral traits like whether it changes booking status permanently.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.