Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Update an existing collection schema' conveys only that this is a mutation operation, with no mention of whether it replaces or merges the schema, whether data is affected, whether validation occurs, or what the consequences are.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.