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A schema annotation is a documentation snippet that appears in the Content Completion Assistant offering more information about the current proposal.

This feature is enabled by default, but you can disable it by deselecting the Show annotations in Content Completion Assistant option in the Annotations preferences page.

Collecting Annotations from the JSON Schema

In a JSON Schema, the annotations are specified in the value of the title and description properties like this:
"idType": {
  "title": "The 'id' property",
  "description": "Specifies a required ID for this person.",
  "type": "string",
  "maxLength": 20
}