Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden. The verb 'Search' implies a non-mutating read operation, which is the primary behavior. However, the description does not explicitly state that it is read-only or safe, nor does it mention any output format beyond the implicit BGG ID.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.