diff --git a/lib/project_types/extension/commands/build.rb b/lib/project_types/extension/commands/build.rb
index 262ca5aa72..f7a9a27799 100644
--- a/lib/project_types/extension/commands/build.rb
+++ b/lib/project_types/extension/commands/build.rb
@@ -24,21 +24,16 @@ def self.help
       private
 
       def run_new_flow(project)
-        Tasks::RunExtensionCommand.new(
+        output = Tasks::RunExtensionCommand.new(
           type: project.specification_identifier.downcase,
           command: "build",
           config_file_name: specification_handler.server_config_file,
           context: @ctx,
         ).call
 
-        @ctx.puts(@ctx.message("build.build_success_message"))
+        @ctx.puts(output)
       rescue => error
-        if error.message.include?("no such file or directory")
-          @ctx.abort(@ctx.message("build.directory_not_found"))
-        else
-          @ctx.debug(error)
-          @ctx.abort(@ctx.message("build.build_failure_message"))
-        end
+        @ctx.abort(error.message)
       end
 
       def run_legacy_flow
diff --git a/lib/project_types/extension/messages/messages.rb b/lib/project_types/extension/messages/messages.rb
index de6198d58c..cfd77334db 100644
--- a/lib/project_types/extension/messages/messages.rb
+++ b/lib/project_types/extension/messages/messages.rb
@@ -67,9 +67,6 @@ module Messages
             Usage: {{command:%s extension build}}
         HELP
         frame_title: "Building extension with: %s…",
-        build_failure_message: "Failed to build extension code.",
-        build_success_message: "Build was successful!",
-        directory_not_found: "Build directory not found.",
       },
       register: {
         help: <<~HELP,
diff --git a/lib/project_types/extension/models/development_server.rb b/lib/project_types/extension/models/development_server.rb
index e5ec445f3b..265ffc58f4 100644
--- a/lib/project_types/extension/models/development_server.rb
+++ b/lib/project_types/extension/models/development_server.rb
@@ -33,8 +33,8 @@ def create(server_config)
       end
 
       def build(server_config)
-        _, error, status = CLI::Kit::System.capture3(executable, "build", "-", stdin_data: server_config.to_yaml)
-        return if status.success?
+        output, error, status = CLI::Kit::System.capture3(executable, "build", "-", stdin_data: server_config.to_yaml)
+        return output if status.success?
         raise DevelopmentServerError, error
       end
 
diff --git a/test/project_types/extension/models/development_server_test.rb b/test/project_types/extension/models/development_server_test.rb
index 00785b8da0..fbf6b3ec9f 100644
--- a/test/project_types/extension/models/development_server_test.rb
+++ b/test/project_types/extension/models/development_server_test.rb
@@ -32,9 +32,10 @@ def test_build_calls_executable_and_is_successful
 
           CLI::Kit::System.expects(:capture3)
             .with(@development_server.executable, "build", "-", stdin_data: server_config.to_yaml)
-            .returns(["", nil, mock(success?: true)])
+            .returns(["some output", nil, mock(success?: true)])
 
-          @development_server.build(server_config)
+          output = @development_server.build(server_config)
+          assert_equal "some output", output
         end
       end