diff --git a/lib/engines/content_object_store/app/lib/content_object_store/publishable.rb b/lib/engines/content_object_store/app/lib/content_object_store/publishable.rb
index 543e5a1be849..0149c07cb023 100644
--- a/lib/engines/content_object_store/app/lib/content_object_store/publishable.rb
+++ b/lib/engines/content_object_store/app/lib/content_object_store/publishable.rb
@@ -57,7 +57,11 @@ def remove_cache_for_host_content(content_block_edition:)
         content_block_document: content_block_edition.document,
       )
       host_content_items.each do |host_content_item|
-        ContentObjectStore::PublishIntentWorker.perform_async(host_content_item.base_path, Time.zone.now.to_s)
+        ContentObjectStore::PublishIntentWorker.perform_async(
+          host_content_item.base_path,
+          host_content_item.publishing_app,
+          Time.zone.now.to_s,
+        )
       end
     end
 
diff --git a/lib/engines/content_object_store/app/workers/content_object_store/publish_intent_worker.rb b/lib/engines/content_object_store/app/workers/content_object_store/publish_intent_worker.rb
index a727fac801d6..840027d52575 100644
--- a/lib/engines/content_object_store/app/workers/content_object_store/publish_intent_worker.rb
+++ b/lib/engines/content_object_store/app/workers/content_object_store/publish_intent_worker.rb
@@ -4,9 +4,9 @@ module ContentObjectStore
   class PublishIntentWorker < WorkerBase
     sidekiq_options queue: :content_block_publishing
 
-    def perform(base_path, publish_timestamp)
+    def perform(base_path, publishing_app, publish_timestamp)
       publish_timestamp = Time.zone.parse(publish_timestamp)
-      publish_intent = PublishingApi::PublishIntentPresenter.new(base_path, publish_timestamp)
+      publish_intent = PublishingApi::PublishIntentPresenter.new(base_path, publish_timestamp, publishing_app)
 
       Services.publishing_api.put_intent(base_path, publish_intent.as_json)
     end
diff --git a/lib/engines/content_object_store/test/integration/content_block/workflow_test.rb b/lib/engines/content_object_store/test/integration/content_block/workflow_test.rb
index b8c68f2d31be..9e086de05a78 100644
--- a/lib/engines/content_object_store/test/integration/content_block/workflow_test.rb
+++ b/lib/engines/content_object_store/test/integration/content_block/workflow_test.rb
@@ -121,6 +121,7 @@ class ContentObjectStore::ContentBlock::WorkflowTest < ActionDispatch::Integrati
           "document_type" => "document",
           "base_path" => "/host-document",
           "content_id" => "1234abc",
+          "publishing_app" => "host_publisher",
           "primary_publishing_organisation" => {
             "content_id" => "456abc",
             "title" => "Organisation",
@@ -140,7 +141,7 @@ class ContentObjectStore::ContentBlock::WorkflowTest < ActionDispatch::Integrati
     publishing_api_mock.expect :put_intent, {}, ["/host-document",
                                                  {
                                                    publish_time: Time.zone.now,
-                                                   publishing_app: "whitehall",
+                                                   publishing_app: "host_publisher",
                                                    rendering_app: "government-frontend",
                                                    routes: [{ path: "/host-document", type: "exact" }],
                                                  }]
@@ -280,6 +281,7 @@ class ContentObjectStore::ContentBlock::WorkflowTest < ActionDispatch::Integrati
           "document_type" => "document",
           "base_path" => "/host-document",
           "content_id" => "1234abc",
+          "publishing_app" => "host_publisher",
           "primary_publishing_organisation" => {
             "content_id" => "456abc",
             "title" => "Organisation",
@@ -299,7 +301,7 @@ class ContentObjectStore::ContentBlock::WorkflowTest < ActionDispatch::Integrati
     publishing_api_mock.expect :put_intent, {}, ["/host-document",
                                                  {
                                                    publish_time: Time.zone.now,
-                                                   publishing_app: "whitehall",
+                                                   publishing_app: "host_publisher",
                                                    rendering_app: "government-frontend",
                                                    routes: [{ path: "/host-document", type: "exact" }],
                                                  }]
diff --git a/lib/engines/content_object_store/test/unit/app/services/publish_edition_service_test.rb b/lib/engines/content_object_store/test/unit/app/services/publish_edition_service_test.rb
index d59262266d3d..fe5f28158cb8 100644
--- a/lib/engines/content_object_store/test/unit/app/services/publish_edition_service_test.rb
+++ b/lib/engines/content_object_store/test/unit/app/services/publish_edition_service_test.rb
@@ -83,6 +83,7 @@ class ContentObjectStore::PublishEditionServiceTest < ActiveSupport::TestCase
             "document_type" => "document",
             "base_path" => "/host-document",
             "content_id" => "1234abc",
+            "publishing_app" => "example-app",
             "primary_publishing_organisation" => {
               "content_id" => "456abc",
               "title" => "Organisation",
@@ -93,7 +94,11 @@ class ContentObjectStore::PublishEditionServiceTest < ActiveSupport::TestCase
 
       stub_publishing_api_has_embedded_content(content_id:, total: 0, results: host_content)
 
-      ContentObjectStore::PublishIntentWorker.expects(:perform_async).with("/host-document", Time.zone.now.to_s).once
+      ContentObjectStore::PublishIntentWorker.expects(:perform_async).with(
+        "/host-document",
+        "example-app",
+        Time.zone.now.to_s,
+      ).once
 
       ContentObjectStore::PublishEditionService.new(schema).call(edition)
     end
diff --git a/lib/engines/content_object_store/test/unit/app/services/update_edition_service_test.rb b/lib/engines/content_object_store/test/unit/app/services/update_edition_service_test.rb
index 81bb2b240230..b3071b7509b1 100644
--- a/lib/engines/content_object_store/test/unit/app/services/update_edition_service_test.rb
+++ b/lib/engines/content_object_store/test/unit/app/services/update_edition_service_test.rb
@@ -251,6 +251,7 @@ class ContentObjectStore::UpdateEditionServiceTest < ActiveSupport::TestCase
             "document_type" => "document",
             "base_path" => "/host-document",
             "content_id" => "1234abc",
+            "publishing_app" => "example-app",
             "primary_publishing_organisation" => {
               "content_id" => "456abc",
               "title" => "Organisation",
@@ -261,7 +262,11 @@ class ContentObjectStore::UpdateEditionServiceTest < ActiveSupport::TestCase
 
       stub_publishing_api_has_embedded_content(content_id:, total: 0, results: dependent_content)
 
-      ContentObjectStore::PublishIntentWorker.expects(:perform_async).with("/host-document", Time.zone.now.to_s).once
+      ContentObjectStore::PublishIntentWorker.expects(:perform_async).with(
+        "/host-document",
+        "example-app",
+        Time.zone.now.to_s,
+      ).once
 
       ContentObjectStore::UpdateEditionService
         .new(schema, @original_content_block_edition)
diff --git a/lib/engines/content_object_store/test/unit/app/workers/publish_intent_worker_test.rb b/lib/engines/content_object_store/test/unit/app/workers/publish_intent_worker_test.rb
index d97abd3d2cc7..4e83af34e621 100644
--- a/lib/engines/content_object_store/test/unit/app/workers/publish_intent_worker_test.rb
+++ b/lib/engines/content_object_store/test/unit/app/workers/publish_intent_worker_test.rb
@@ -4,10 +4,11 @@ class ContentObjectStore::PublishIntentWorkerTest < ActiveSupport::TestCase
   test "#perform adds a publishing intent to the Publishing API" do
     base_path = "/base-path"
     timestamp = Time.zone.now.to_s
+    publishing_app = "publisher"
     publish_intent = { foo: "bar" }
 
-    PublishingApi::PublishIntentPresenter.expects(:new).with(base_path, timestamp).once.returns(publish_intent)
+    PublishingApi::PublishIntentPresenter.expects(:new).with(base_path, timestamp, publishing_app).once.returns(publish_intent)
     Services.publishing_api.expects(:put_intent).once.with(base_path, publish_intent.as_json)
-    ContentObjectStore::PublishIntentWorker.new.perform(base_path, timestamp)
+    ContentObjectStore::PublishIntentWorker.new.perform(base_path, publishing_app, timestamp)
   end
 end