diff --git a/homeassistant/components/conversation/models.py b/homeassistant/components/conversation/models.py
index 902b52483e0..724e520e6df 100644
--- a/homeassistant/components/conversation/models.py
+++ b/homeassistant/components/conversation/models.py
@@ -23,11 +23,22 @@ class ConversationInput:
     """User input to be processed."""
 
     text: str
+    """User spoken text."""
+
     context: Context
+    """Context of the request."""
+
     conversation_id: str | None
+    """Unique identifier for the conversation."""
+
     device_id: str | None
+    """Unique identifier for the device."""
+
     language: str
+    """Language of the request."""
+
     agent_id: str | None = None
+    """Agent to use for processing."""
 
 
 @dataclass(slots=True)
diff --git a/tests/components/conversation/test_agent_manager.py b/tests/components/conversation/test_agent_manager.py
new file mode 100644
index 00000000000..47b58a522a8
--- /dev/null
+++ b/tests/components/conversation/test_agent_manager.py
@@ -0,0 +1,34 @@
+"""Test agent manager."""
+
+from unittest.mock import patch
+
+from homeassistant.components.conversation import ConversationResult, async_converse
+from homeassistant.core import Context, HomeAssistant
+from homeassistant.helpers.intent import IntentResponse
+
+
+async def test_async_converse(hass: HomeAssistant, init_components) -> None:
+    """Test the async_converse method."""
+    context = Context()
+    with patch(
+        "homeassistant.components.conversation.default_agent.DefaultAgent.async_process",
+        return_value=ConversationResult(response=IntentResponse(language="test lang")),
+    ) as mock_process:
+        await async_converse(
+            hass,
+            text="test command",
+            conversation_id="test id",
+            context=context,
+            language="test lang",
+            agent_id="conversation.home_assistant",
+            device_id="test device id",
+        )
+
+    assert mock_process.called
+    conversation_input = mock_process.call_args[0][0]
+    assert conversation_input.text == "test command"
+    assert conversation_input.conversation_id == "test id"
+    assert conversation_input.context is context
+    assert conversation_input.language == "test lang"
+    assert conversation_input.agent_id == "conversation.home_assistant"
+    assert conversation_input.device_id == "test device id"