Best practices via Rubocop

Is there a list of good practices for Grape? I would like to add some rubocop cops to check developers are following good practices.

For example: it is better to use declared(params) instead of params as params doesn't remove unvalidated params. Cop:

module RuboCop
  module Cop
    module Grape
      class Params < RuboCop::Cop::Cop
        MSG = 'Avoid using params variable. Use declared(params) instead (to remove unvalidated params). More info: https://github.com/ruby-grape/grape#declared'.freeze

        def_node_matcher :params_used?, <<-END
          (send (send nil :params) :[] ...)
        END

        def on_send(node)
          return unless in_grape_api?(node)
          params_used?(node) do
            add_offense(node, :expression, format(MSG, node.source))
          end
        end

        private

        def in_grape_api?(node)
          path = node.location.expression.source_buffer.name
          models_path = File.join(Dir.pwd, 'app', 'api')

          path.start_with?(models_path)
        end
      end
    end
  end
end

Start by reviewing the proposed Params cop and the linked Grape guidance for declared(params). Determine which Grape best practices are agreed and which RuboCop cops would be in scope; done requires an agreed practices list and implementation scope.