diff --git a/homeassistant/components/assist_pipeline/pipeline.py b/homeassistant/components/assist_pipeline/pipeline.py
index c6aa14bff151d5..ce6f3e8d024a2c 100644
--- a/homeassistant/components/assist_pipeline/pipeline.py
+++ b/homeassistant/components/assist_pipeline/pipeline.py
@@ -5,7 +5,7 @@
 import array
 import asyncio
 from collections import defaultdict, deque
-from collections.abc import AsyncGenerator, AsyncIterable, Callable, Iterable
+from collections.abc import AsyncGenerator, AsyncIterable, Callable
 from dataclasses import asdict, dataclass, field
 from enum import StrEnum
 import logging
@@ -118,8 +118,10 @@ def validate_language(data: dict[str, Any]) -> Any:
 @callback
 def _async_resolve_default_pipeline_settings(
     hass: HomeAssistant,
-    stt_engine_id: str | None,
-    tts_engine_id: str | None,
+    *,
+    conversation_engine_id: str | None = None,
+    stt_engine_id: str | None = None,
+    tts_engine_id: str | None = None,
     pipeline_name: str,
 ) -> dict[str, str | None]:
     """Resolve settings for a default pipeline.
@@ -137,12 +139,13 @@ def _async_resolve_default_pipeline_settings(
     wake_word_entity = None
     wake_word_id = None
 
+    if conversation_engine_id is None:
+        conversation_engine_id = conversation.HOME_ASSISTANT_AGENT
+
     # Find a matching language supported by the Home Assistant conversation agent
     conversation_languages = language_util.matches(
         hass.config.language,
-        conversation.async_get_conversation_languages(
-            hass, conversation.HOME_ASSISTANT_AGENT
-        ),
+        conversation.async_get_conversation_languages(hass, conversation_engine_id),
         country=hass.config.country,
     )
     if conversation_languages:
@@ -201,7 +204,7 @@ def _async_resolve_default_pipeline_settings(
             tts_engine_id = None
 
     return {
-        "conversation_engine": conversation.HOME_ASSISTANT_AGENT,
+        "conversation_engine": conversation_engine_id,
         "conversation_language": conversation_language,
         "language": hass.config.language,
         "name": pipeline_name,
@@ -224,7 +227,7 @@ async def _async_create_default_pipeline(
     default stt / tts engines.
     """
     pipeline_settings = _async_resolve_default_pipeline_settings(
-        hass, stt_engine_id=None, tts_engine_id=None, pipeline_name="Home Assistant"
+        hass, pipeline_name="Home Assistant"
     )
     return await pipeline_store.async_create_item(pipeline_settings)
 
@@ -243,7 +246,10 @@ async def async_create_default_pipeline(
     pipeline_data: PipelineData = hass.data[DOMAIN]
     pipeline_store = pipeline_data.pipeline_store
     pipeline_settings = _async_resolve_default_pipeline_settings(
-        hass, stt_engine_id, tts_engine_id, pipeline_name=pipeline_name
+        hass,
+        stt_engine_id=stt_engine_id,
+        tts_engine_id=tts_engine_id,
+        pipeline_name=pipeline_name,
     )
     if (
         pipeline_settings["stt_engine"] != stt_engine_id
@@ -274,11 +280,11 @@ def async_get_pipeline(hass: HomeAssistant, pipeline_id: str | None = None) -> P
 
 
 @callback
-def async_get_pipelines(hass: HomeAssistant) -> Iterable[Pipeline]:
+def async_get_pipelines(hass: HomeAssistant) -> list[Pipeline]:
     """Get all pipelines."""
     pipeline_data: PipelineData = hass.data[DOMAIN]
 
-    return pipeline_data.pipeline_store.data.values()
+    return list(pipeline_data.pipeline_store.data.values())
 
 
 async def async_update_pipeline(
@@ -1675,7 +1681,7 @@ def ws_list_item(
         connection.send_result(
             msg["id"],
             {
-                "pipelines": self.storage_collection.async_items(),
+                "pipelines": async_get_pipelines(hass),
                 "preferred_pipeline": self.storage_collection.async_get_preferred_item(),
             },
         )