diff --git a/homeassistant/components/assist_pipeline/pipeline.py b/homeassistant/components/assist_pipeline/pipeline.py
index e41b358ce506a..85bd92563dbb3 100644
--- a/homeassistant/components/assist_pipeline/pipeline.py
+++ b/homeassistant/components/assist_pipeline/pipeline.py
@@ -40,11 +40,11 @@
 STORAGE_VERSION = 1
 
 STORAGE_FIELDS = {
-    vol.Required("conversation_engine"): str,
+    vol.Optional("conversation_engine", default=None): vol.Any(str, None),
     vol.Required("language"): str,
     vol.Required("name"): str,
-    vol.Required("stt_engine"): str,
-    vol.Required("tts_engine"): str,
+    vol.Optional("stt_engine", default=None): vol.Any(str, None),
+    vol.Optional("tts_engine", default=None): vol.Any(str, None),
 }
 
 STORED_PIPELINE_RUNS = 10
diff --git a/tests/components/assist_pipeline/test_pipeline.py b/tests/components/assist_pipeline/test_pipeline.py
index 6eee84d9e9b7e..f84fb2fa1d1ea 100644
--- a/tests/components/assist_pipeline/test_pipeline.py
+++ b/tests/components/assist_pipeline/test_pipeline.py
@@ -34,11 +34,11 @@ async def test_load_datasets(hass: HomeAssistant, init_components) -> None:
             "tts_engine": "tts_engine_2",
         },
         {
-            "conversation_engine": "conversation_engine_3",
+            "conversation_engine": None,
             "language": "language_3",
             "name": "name_3",
-            "stt_engine": "stt_engine_3",
-            "tts_engine": "tts_engine_3",
+            "stt_engine": None,
+            "tts_engine": None,
         },
     ]
     pipeline_ids = []
@@ -91,12 +91,12 @@ async def test_loading_datasets_from_storage(
                     "tts_engine": "tts_engine_2",
                 },
                 {
-                    "conversation_engine": "conversation_engine_3",
+                    "conversation_engine": None,
                     "id": "01GX8ZWBAQSV1HP3WGJPFWEJ8J",
                     "language": "language_3",
                     "name": "name_3",
-                    "stt_engine": "stt_engine_3",
-                    "tts_engine": "tts_engine_3",
+                    "stt_engine": None,
+                    "tts_engine": None,
                 },
             ],
             "preferred_item": "01GX8ZWBAQYWNB1XV3EXEZ75DY",
diff --git a/tests/components/assist_pipeline/test_websocket.py b/tests/components/assist_pipeline/test_websocket.py
index c34dc187490d0..4a61901c14e6f 100644
--- a/tests/components/assist_pipeline/test_websocket.py
+++ b/tests/components/assist_pipeline/test_websocket.py
@@ -613,6 +613,35 @@ async def test_add_pipeline(
         tts_engine="test_tts_engine",
     )
 
+    await client.send_json_auto_id(
+        {
+            "type": "assist_pipeline/pipeline/create",
+            "language": "test_language",
+            "name": "test_name",
+        }
+    )
+    msg = await client.receive_json()
+    assert msg["success"]
+    assert msg["result"] == {
+        "conversation_engine": None,
+        "id": ANY,
+        "language": "test_language",
+        "name": "test_name",
+        "stt_engine": None,
+        "tts_engine": None,
+    }
+
+    assert len(pipeline_store.data) == 2
+    pipeline = pipeline_store.data[msg["result"]["id"]]
+    assert pipeline == Pipeline(
+        conversation_engine=None,
+        id=msg["result"]["id"],
+        language="test_language",
+        name="test_name",
+        stt_engine=None,
+        tts_engine=None,
+    )
+
 
 async def test_delete_pipeline(
     hass: HomeAssistant, hass_ws_client: WebSocketGenerator, init_components
@@ -808,6 +837,38 @@ async def test_update_pipeline(
         tts_engine="new_tts_engine",
     )
 
+    await client.send_json_auto_id(
+        {
+            "type": "assist_pipeline/pipeline/update",
+            "conversation_engine": None,
+            "language": "new_language",
+            "name": "new_name",
+            "pipeline_id": pipeline_id,
+            "stt_engine": None,
+            "tts_engine": None,
+        }
+    )
+    msg = await client.receive_json()
+    assert msg["success"]
+    assert msg["result"] == {
+        "conversation_engine": None,
+        "id": pipeline_id,
+        "language": "new_language",
+        "name": "new_name",
+        "stt_engine": None,
+        "tts_engine": None,
+    }
+
+    pipeline = pipeline_store.data[pipeline_id]
+    assert pipeline == Pipeline(
+        conversation_engine=None,
+        id=pipeline_id,
+        language="new_language",
+        name="new_name",
+        stt_engine=None,
+        tts_engine=None,
+    )
+
 
 async def test_set_preferred_pipeline(
     hass: HomeAssistant, hass_ws_client: WebSocketGenerator, init_components