val openApiSpec: OpenAPI =
    def addTagsToOperation(operation: OpenAPI.Operation, tags: Seq[String]): OpenAPI.Operation =
      operation.copy(tags = operation.tags ++ tags)

    def addTagsToPathItem(pathItem: OpenAPI.PathItem, tags: Seq[String]): OpenAPI.PathItem =
      pathItem.copy(
        get = pathItem.get.map(addTagsToOperation(_, tags)),
        put = pathItem.put.map(addTagsToOperation(_, tags)),
        post = pathItem.post.map(addTagsToOperation(_, tags)),
        delete = pathItem.delete.map(addTagsToOperation(_, tags)),
        options = pathItem.options.map(addTagsToOperation(_, tags)),
        head = pathItem.head.map(addTagsToOperation(_, tags)),
        patch = pathItem.patch.map(addTagsToOperation(_, tags)),
        trace = pathItem.trace.map(addTagsToOperation(_, tags))
      )

    def addTagsToOpenApiSpec(openApiSpec: OpenAPI, tags: Seq[String]): OpenAPI =
      openApiSpec.copy(paths = openApiSpec.paths.map {
        case (path, pathItem) => (path, addTagsToPathItem(pathItem, tags))
      })

    val defaultEndpointSpec = addTagsToOpenApiSpec(OpenAPIGen.fromEndpoints(defaultEndpoints), Seq("default"))
    val adminSpec = addTagsToOpenApiSpec(OpenAPIGen.fromEndpoints(adminEndpoints), Seq("admin"))

    (defaultEndpointSpec ++ adminSpec)
      .title("Example service")
      .copy(tags = List(OpenAPI.Tag("default", None, None), OpenAPI.Tag("admin", None, None)))