mutation GraphCheckMutation(
  $graph_id: ID!
  $proposed_schema: String
  $variant: String
  $git_context: GitContextInput!
  $config: HistoricQueryParameters!
) {
  service(id: $graph_id) {
    checkSchema(
      proposedSchemaDocument: $proposed_schema
      baseSchemaTag: $variant
      gitContext: $git_context
      historicParameters: $config
    ) {
      targetUrl
      diffToPrevious {
        severity
        numberOfCheckedOperations
        changes {
          severity
          code
          description
        }
      }
    }
  }
}