BetaOptional BetacommentOptional BetacontextOptional BetadatasetBetamessageBetaparentThe comment being replied to. Replies to a reply join the same thread.
Optional BetaperspectiveOptional BetaprojectOptional BetaresourceExplicit resource to use. On an individual operation this overrides any default;
on a SanityConfig it becomes the instance's default resource. Unlike
projectId/dataset, this can also be a media library or canvas resource.
A dataset handle rather than a document one: everything placing the reply — the thread, the field, the document it targets — is read off the parent comment, so naming a document here would only be a second source of truth.