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 only states 'Delete a webhook,' which implies mutation but does not disclose that deletion is irreversible, may require permissions, or what happens on failure or nonexistent IDs. This is a destructive operation lacking caveats, similar to the update_drive calibration example that scored 2.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.