Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must fully detail behavior. It only states 'Convert a slug back to readable text' without explaining how the conversion works (e.g., replacing separators with spaces, handling capitalization). No mention of edge cases, permissions, or return format. This is insufficient for a tool with 3 parameters.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.