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 states 'Update' implies a mutation, but doesn't specify required permissions, whether changes are reversible, error handling, or any side effects. This is inadequate for a mutation tool with zero annotation coverage, as critical behavioral traits are missing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.