Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotation readOnlyHint=true already indicates this is a safe read operation. The description adds the useful context that the list is filtered by SourceBuild eligibility, but does not disclose additional behaviors such as pagination, sorting, or permission requirements. Since annotations cover the safety profile, a score of 3 is appropriate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.