Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide comprehensive behavioral hints (readOnlyHint: true, destructiveHint: false, idempotentHint: true, openWorldHint: true), so the description's burden is reduced. The description adds minimal value by indicating it's a GET operation, which aligns with the read-only nature. However, it doesn't provide any additional behavioral context about what 'show' means operationally, what gets displayed, or any constraints beyond what annotations already cover.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.