diff --git a/src/a2a/client/helpers.py b/src/a2a/client/helpers.py
index 930c71e6..67a39ce7 100644
--- a/src/a2a/client/helpers.py
+++ b/src/a2a/client/helpers.py
@@ -1,22 +1,32 @@
 """Helper functions for the A2A client."""
 
+from typing import Any
 from uuid import uuid4
 
 from a2a.types import Message, Part, Role, TextPart
 
 
 def create_text_message_object(
-    role: Role = Role.user, content: str = ''
+    role: Role = Role.user,
+    content: str = '',
+    extensions: list[str] | None = None,
+    metadata: dict[str, Any] | None = None,
 ) -> Message:
     """Create a Message object containing a single TextPart.
 
     Args:
         role: The role of the message sender (user or agent). Defaults to Role.user.
         content: The text content of the message. Defaults to an empty string.
+        extensions: The extensions of the message. Defaults to an empty list.
+        metadata: The metadata of the message. Defaults to an empty dictionary.
 
     Returns:
         A `Message` object with a new UUID message_id.
     """
     return Message(
-        role=role, parts=[Part(TextPart(text=content))], message_id=str(uuid4())
+        role=role,
+        parts=[Part(TextPart(text=content))],
+        message_id=str(uuid4()),
+        extensions=extensions or [],
+        metadata=metadata or {},
     )
diff --git a/tests/client/test_jsonrpc_client.py b/tests/client/test_jsonrpc_client.py
index 58feec25..57600cf5 100644
--- a/tests/client/test_jsonrpc_client.py
+++ b/tests/client/test_jsonrpc_client.py
@@ -378,6 +378,64 @@ async def test_send_message_success(
         assert isinstance(response, Message)
         assert response.model_dump() == success_response.model_dump()
 
+    @pytest.mark.asyncio
+    async def test_send_message_success_with_extensions(
+        self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
+    ):
+        client = JsonRpcTransport(
+            httpx_client=mock_httpx_client, agent_card=mock_agent_card
+        )
+        params = MessageSendParams(
+            message=create_text_message_object(
+                content='Hello', extensions=['test']
+            )
+        )
+        success_response = create_text_message_object(
+            role=Role.agent, content='Hi there!', extensions=['test']
+        )
+        rpc_response = SendMessageSuccessResponse(
+            id='123', jsonrpc='2.0', result=success_response
+        )
+        response = httpx.Response(
+            200, json=rpc_response.model_dump(mode='json')
+        )
+        response.request = httpx.Request('POST', 'http://agent.example.com/api')
+        mock_httpx_client.post.return_value = response
+
+        response = await client.send_message(request=params)
+
+        assert isinstance(response, Message)
+        assert response.model_dump() == success_response.model_dump()
+
+    @pytest.mark.asyncio
+    async def test_send_message_success_with_metadata(
+        self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
+    ):
+        client = JsonRpcTransport(
+            httpx_client=mock_httpx_client, agent_card=mock_agent_card
+        )
+        params = MessageSendParams(
+            message=create_text_message_object(
+                content='Hello', metadata={'test': 'test'}
+            )
+        )
+        success_response = create_text_message_object(
+            role=Role.agent, content='Hi there!', metadata={'test': 'test'}
+        )
+        rpc_response = SendMessageSuccessResponse(
+            id='123', jsonrpc='2.0', result=success_response
+        )
+        response = httpx.Response(
+            200, json=rpc_response.model_dump(mode='json')
+        )
+        response.request = httpx.Request('POST', 'http://agent.example.com/api')
+        mock_httpx_client.post.return_value = response
+
+        response = await client.send_message(request=params)
+
+        assert isinstance(response, Message)
+        assert response.model_dump() == success_response.model_dump()
+
     @pytest.mark.asyncio
     async def test_send_message_error_response(
         self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock