Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and openWorldHint, covering safety. The description adds that the data is read live from GitHub, which conveys freshness and external dependency. It doesn't mention rate limits or network behavior, but this is a simple read-only operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.