Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral traits. It discloses that the tool returns metadata and optional SKILL.md body, mentions response includes version, stats, install command, and SKILL.md content, and states free usage. It implies read-only operation by 'Fetch', but does not explicitly confirm idempotency or no side effects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.