diff --git a/lib/cucumber/formatter/message.rb b/lib/cucumber/formatter/message.rb
index 38f3b4f71..a4abcb805 100644
--- a/lib/cucumber/formatter/message.rb
+++ b/lib/cucumber/formatter/message.rb
@@ -1,20 +1,23 @@
 # frozen_string_literal: true
 
 require 'cucumber/formatter/io'
-require 'cucumber/formatter/message_builder'
+require 'cucumber/query'
 
 module Cucumber
   module Formatter
     # The formatter used for <tt>--format message</tt>
-    class Message < MessageBuilder
+    class Message
       include Io
 
       def initialize(config)
         @io = ensure_io(config.out_stream, config.error_stream)
-        super(config)
+        @repository = Cucumber::Repository.new
+        @query = Cucumber::Query.new(@repository)
+        config.on_event :envelope, &method(:output_envelope)
       end
 
-      def output_envelope(envelope)
+      def output_envelope(event)
+        envelope = event.envelope
         @repository.update(envelope)
         @io.write(envelope.to_json)
         @io.write("\n")
diff --git a/lib/cucumber/formatter/message_builder.rb b/lib/cucumber/formatter/message_builder.rb
index 86a0e9204..7cc31fa84 100644
--- a/lib/cucumber/formatter/message_builder.rb
+++ b/lib/cucumber/formatter/message_builder.rb
@@ -3,8 +3,6 @@
 require 'base64'
 require 'cucumber/formatter/backtrace_filter'
 
-require 'cucumber/query'
-
 module Cucumber
   module Formatter
     class MessageBuilder
@@ -14,7 +12,6 @@ class MessageBuilder
       def initialize(config)
         @config = config
         @repository = Cucumber::Repository.new
-        @query = Cucumber::Query.new(@repository)
 
         @test_run_started_id = config.id_generator.new_id
 
@@ -27,7 +24,6 @@ def initialize(config)
         @step_match_arguments_by_test_step_id = {}
 
         # Ensure all handlers for events occur after all ivars are instantiated
-        config.on_event :envelope, &method(:on_envelope)
 
         config.on_event :gherkin_source_parsed, &method(:on_gherkin_source_parsed)
         config.on_event :gherkin_source_read, &method(:on_gherkin_source_read)
@@ -35,7 +31,6 @@ def initialize(config)
         config.on_event :hook_test_step_created, &method(:on_hook_test_step_created)
 
         config.on_event :step_activated, &method(:on_step_activated)
-        config.on_event :step_definition_registered, &method(:on_step_definition_registered)
 
         config.on_event :test_case_created, &method(:on_test_case_created)
         config.on_event :test_case_ready, &method(:on_test_case_ready)
@@ -74,15 +69,11 @@ def attach(src, media_type, filename)
         end
 
         message = Cucumber::Messages::Envelope.new(attachment: Cucumber::Messages::Attachment.new(**attachment_data))
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       private
 
-      def on_envelope(event)
-        output_envelope(event.envelope)
-      end
-
       def on_gherkin_source_parsed(_event)
         # TODO: Handle GherkinSourceParsed
       end
@@ -96,7 +87,7 @@ def on_gherkin_source_read(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_hook_test_step_created(event)
@@ -108,10 +99,6 @@ def on_step_activated(event)
         @step_match_arguments_by_test_step_id[event.test_step.id] = event.step_match.step_arguments
       end
 
-      def on_step_definition_registered(event)
-        output_envelope(event.step_definition.to_envelope)
-      end
-
       def on_test_case_created(event)
         @pickle_id_by_test_case_id[event.test_case.id] = event.pickle.id
       end
@@ -129,7 +116,7 @@ def on_test_case_ready(event)
         # TODO: This may be a redundant update. But for now we're leaving this in whilst we're in the transitory phase
         @repository.update(message)
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_case_started(event)
@@ -153,7 +140,8 @@ def on_test_case_started(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
+        @repository.update(message)
       end
 
       def on_test_case_finished(event)
@@ -176,7 +164,7 @@ def on_test_case_finished(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_run_started(*)
@@ -187,7 +175,7 @@ def on_test_run_started(*)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_run_finished(event)
@@ -199,7 +187,7 @@ def on_test_run_finished(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_run_hook_started(event)
@@ -214,7 +202,7 @@ def on_test_run_hook_started(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_run_hook_finished(event)
@@ -238,7 +226,7 @@ def on_test_run_hook_finished(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_step_created(event)
@@ -267,7 +255,7 @@ def on_test_step_started(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_test_step_finished(event)
@@ -305,7 +293,7 @@ def on_test_step_finished(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def on_undefined_parameter_type(event)
@@ -316,7 +304,7 @@ def on_undefined_parameter_type(event)
           )
         )
 
-        output_envelope(message)
+        @config.event_bus.envelope(message)
       end
 
       def test_step_to_message(step)
diff --git a/lib/cucumber/formatter/rerun.rb b/lib/cucumber/formatter/rerun.rb
index bbf7b3081..ae6436628 100644
--- a/lib/cucumber/formatter/rerun.rb
+++ b/lib/cucumber/formatter/rerun.rb
@@ -1,17 +1,23 @@
 # frozen_string_literal: true
 
 require 'cucumber/formatter/io'
-require 'cucumber/formatter/message_builder'
+require 'cucumber/query'
 
 module Cucumber
   module Formatter
-    class Rerun < MessageBuilder
+    class Rerun
+      include Io
+
       def initialize(config)
+        @config = config
         @io = ensure_io(config.out_stream, config.error_stream)
-        super(config)
+        @repository = Cucumber::Repository.new
+        @query = Cucumber::Query.new(@repository)
+        config.on_event :envelope, &method(:output_envelope)
       end
 
-      def output_envelope(envelope)
+      def output_envelope(event)
+        envelope = event.envelope
         @repository.update(envelope)
         finish_report if envelope.test_run_finished
       end
diff --git a/lib/cucumber/glue/registry_and_more.rb b/lib/cucumber/glue/registry_and_more.rb
index f042c027a..09ef22962 100644
--- a/lib/cucumber/glue/registry_and_more.rb
+++ b/lib/cucumber/glue/registry_and_more.rb
@@ -99,6 +99,7 @@ def register_rb_step_definition(string_or_regexp, proc_or_sym, options)
         step_definition = StepDefinition.new(@configuration.id_generator.new_id, self, string_or_regexp, proc_or_sym, options)
         @step_definitions << step_definition
         @configuration.notify :step_definition_registered, step_definition
+        @configuration.notify :envelope, step_definition.to_envelope
         step_definition
       rescue Cucumber::CucumberExpressions::UndefinedParameterTypeError => e
         # TODO: add a way to extract the parameter type directly from the error.
diff --git a/lib/cucumber/runtime.rb b/lib/cucumber/runtime.rb
index 3315fd171..9efd5ca43 100644
--- a/lib/cucumber/runtime.rb
+++ b/lib/cucumber/runtime.rb
@@ -191,12 +191,16 @@ def set_encoding
     def report
       return @report if @report
 
-      reports = [summary_report] + formatters
+      reports = [message_builder, summary_report] + formatters
       reports << fail_fast_report if @configuration.fail_fast?
       reports << publish_banner_printer unless @configuration.publish_quiet?
       @report ||= Formatter::Fanout.new(reports)
     end
 
+    def message_builder
+      @message_builder ||= Formatter::MessageBuilder.new(@configuration)
+    end
+
     def summary_report
       @summary_report ||= Core::Report::Summary.new(@configuration.event_bus)
     end
diff --git a/spec/cucumber/formatter/rerun_spec.rb b/spec/cucumber/formatter/rerun_spec.rb
index ae4385701..6c8cefc60 100644
--- a/spec/cucumber/formatter/rerun_spec.rb
+++ b/spec/cucumber/formatter/rerun_spec.rb
@@ -36,6 +36,7 @@ module Formatter
           end
 
           described_class.new(config)
+          MessageBuilder.new(config)
           execute [gherkin], [StandardStepActions.new, Filters::BroadcastTestRunStartedEvent.new(config), Filters::BroadcastTestCaseReadyEvent.new(config)], config.event_bus
           config.event_bus.test_run_finished
 
@@ -70,6 +71,7 @@ module Formatter
           end
 
           described_class.new(config)
+          MessageBuilder.new(config)
           execute [foo, bar], [StandardStepActions.new, Filters::BroadcastTestRunStartedEvent.new(config), Filters::BroadcastTestCaseReadyEvent.new(config)], config.event_bus
           config.event_bus.test_run_finished
 
@@ -88,6 +90,7 @@ module Formatter
           end
 
           described_class.new(config)
+          MessageBuilder.new(config)
           execute [gherkin], [StandardStepActions.new, Filters::BroadcastTestRunStartedEvent.new(config), Filters::BroadcastTestCaseReadyEvent.new(config)], config.event_bus
           config.event_bus.test_run_finished
 
@@ -107,6 +110,7 @@ module Formatter
             end
 
             described_class.new(config)
+            MessageBuilder.new(config)
             execute [gherkin], [FakeObjects::FlakyStepActions.new, Filters::BroadcastTestRunStartedEvent.new(config), Filters::BroadcastTestCaseReadyEvent.new(config)], config.event_bus
 
             config.event_bus.test_run_finished
@@ -128,6 +132,7 @@ module Formatter
             end
 
             described_class.new(config)
+            MessageBuilder.new(config)
             execute [gherkin], [FakeObjects::FlakyStepActions.new, Filters::BroadcastTestRunStartedEvent.new(config), Filters::BroadcastTestCaseReadyEvent.new(config)], config.event_bus
             config.event_bus.test_run_finished
 
@@ -144,6 +149,7 @@ module Formatter
             end
 
             described_class.new(config)
+            MessageBuilder.new(config)
             execute [gherkin, gherkin], [StandardStepActions.new, Filters::BroadcastTestRunStartedEvent.new(config), Filters::BroadcastTestCaseReadyEvent.new(config)], config.event_bus
             config.event_bus.test_run_finished
 
diff --git a/spec/cucumber/formatter/spec_helper.rb b/spec/cucumber/formatter/spec_helper.rb
index 85b7ad34b..ba9d14ee1 100644
--- a/spec/cucumber/formatter/spec_helper.rb
+++ b/spec/cucumber/formatter/spec_helper.rb
@@ -21,7 +21,7 @@ module SpecHelper
 
       def run_defined_feature
         define_steps
-        actual_runtime.visitor = Fanout.new([@formatter])
+        actual_runtime.visitor = Fanout.new([actual_runtime.send(:message_builder), @formatter])
         receiver = Test::Runner.new(event_bus)
 
         event_bus.gherkin_source_read(gherkin_doc.uri, gherkin_doc.body)