fix: Handle readtimeout errors.

src/a2a/client/__init__.py

@@ -10,6 +10,7 @@
     A2AClientError,
     A2AClientHTTPError,
     A2AClientJSONError,
+    A2AClientTimeoutError,
 )
 from a2a.client.grpc_client import A2AGrpcClient
 from a2a.client.helpers import create_text_message_object
@@ -22,6 +23,7 @@
     'A2AClientError',
     'A2AClientHTTPError',
     'A2AClientJSONError',
+    'A2AClientTimeoutError',
     'A2AGrpcClient',
     'AuthInterceptor',
     'ClientCallContext',

src/a2a/client/client.py

@@ -10,7 +10,11 @@
 from httpx_sse import SSEError, aconnect_sse
 from pydantic import ValidationError
 
-from a2a.client.errors import A2AClientHTTPError, A2AClientJSONError
+from a2a.client.errors import (
+    A2AClientHTTPError,
+    A2AClientJSONError,
+    A2AClientTimeoutError,
+)
 from a2a.client.middleware import ClientCallContext, ClientCallInterceptor
 from a2a.types import (
     AgentCard,
@@ -340,6 +344,8 @@ async def _send_request(
             )
             response.raise_for_status()
             return response.json()
+        except httpx.ReadTimeout as e:
+            raise A2AClientTimeoutError('Client Request timed out') from e
         except httpx.HTTPStatusError as e:
             raise A2AClientHTTPError(e.response.status_code, str(e)) from e
         except json.JSONDecodeError as e:

src/a2a/client/errors.py

@@ -31,3 +31,16 @@ def __init__(self, message: str):
         """
         self.message = message
         super().__init__(f'JSON Error: {message}')
+
+
+class A2AClientTimeoutError(A2AClientError):
+    """Client exception for timeout errors during a request."""
+
+    def __init__(self, message: str):
+        """Initializes the A2AClientTimeoutError.
+
+        Args:
+            message: A descriptive error message.
+        """
+        self.message = message
+        super().__init__(f'Timeout Error: {message}')

tests/client/test_client.py

@@ -14,6 +14,7 @@
     A2AClient,
     A2AClientHTTPError,
     A2AClientJSONError,
+    A2AClientTimeoutError,
     create_text_message_object,
 )
 from a2a.types import (
@@ -1266,3 +1267,23 @@ async def test_cancel_task_error_response(
                 mode='json', exclude_none=True
             ) == error_details.model_dump(exclude_none=True)
             assert response.root.id == 'err_cancel_req'
+
+    @pytest.mark.asyncio
+    async def test_send_message_client_timeout(
+        self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
+    ):
+        mock_httpx_client.post.side_effect = httpx.ReadTimeout(
+            'Request timed out'
+        )
+        client = A2AClient(
+            httpx_client=mock_httpx_client, agent_card=mock_agent_card
+        )
+
+        params = MessageSendParams(
+            message=create_text_message_object(content='Hello')
+        )
+
+        request = SendMessageRequest(id=123, params=params)
+
+        with pytest.raises(A2AClientTimeoutError):
+            await client.send_message(request=request)