Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It implies a read-only operation through the verb 'List', but fails to mention pagination behavior, possible error states (e.g., repository not found), or whether the operation is idempotent. The claim of listing 'all' milestones contradicts the schema's default state='open' filter without explanation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.