Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses key behavioral traits: it applies changes to actual files (implying mutation/destructive action), performs automatic backup (safety measure), and handles 'all pending changes' (scope). However, it doesn't detail error handling, permissions required, rate limits, or what 'pending changes' entails, leaving gaps for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.