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let message_size_limit = Protocol.Constants_repr.sc_rollup_message_size_limit

let protocol_max_batch_size =
  let open Protocol in
  let open Alpha_context in
  let empty_message_op : _ Operation.t =
    let open Operation in
    {
      shell = {branch = Block_hash.zero};
      protocol_data =
        {
          signature = Some Signature.zero;
          contents =
            Single
              (Manager_operation
                 {
                   source = Signature.Public_key_hash.zero;
                   fee = Tez.of_mutez_exn Int64.max_int;
                   counter = Manager_counter.Internal_for_tests.of_int max_int;
                   gas_limit =
                     Gas.Arith.integral_of_int_exn ((max_int - 1) / 1000);
                   storage_limit = Z.of_int max_int;
                   operation = Sc_rollup_add_messages {messages = [""]};
                 });
        };
    }
  in
  Protocol.Constants_repr.max_operation_data_length
  - Data_encoding.Binary.length
      Operation.encoding_with_legacy_attestation_name
      (Operation.pack empty_message_op)