fix: Append metadata and context id when processing TaskStatusUpdateE…

src/a2a/server/events/event_consumer.py

@@ -138,6 +138,10 @@ async def consume_all(self) -> AsyncGenerator[Event]:
                 # python 3.12 and get a queue empty error on an open queue
                 if self.queue.is_closed():
                     break
+            except Exception as e:
+                logger.error(f'Stopping event consumption due to exception: {e}')
+                self._exception = e
+                continue
 
     def agent_task_callback(self, agent_task: asyncio.Task[None]) -> None:
         """Callback to handle exceptions from the agent's execution task.

src/a2a/server/request_handlers/default_request_handler.py

@@ -248,7 +248,9 @@ async def on_message_send(
                 raise ServerError(
                     InternalError(message='Task ID mismatch in agent response')
                 )
-
+        except Exception as e:
+            logger.error(f'Agent execution failed. Error: {e}')
+            raise
         finally:
             if interrupted:
                 # TODO: Track this disconnected cleanup task.

src/a2a/server/tasks/task_manager.py

@@ -130,7 +130,10 @@ async def save_task_event(
                     task.history = [task.status.message]
                 else:
                     task.history.append(task.status.message)
-
+            if event.metadata:
+                if not task.metadata:
+                    task.metadata = {}
+                task.metadata.update(event.metadata)
             task.status = event.status
         else:
             logger.debug('Appending artifact to task %s', task.id)

tests/server/tasks/test_task_manager.py

@@ -127,6 +127,27 @@ async def test_save_task_event_artifact_update(
     updated_task.artifacts = [new_artifact]
     mock_task_store.save.assert_called_once_with(updated_task)
 
+@pytest.mark.asyncio
+async def test_save_task_event_metadata_update(
+    task_manager: TaskManager, mock_task_store: AsyncMock
+) -> None:
+    """Test saving an updated metadata for an existing task."""
+    initial_task = Task(**MINIMAL_TASK)
+    mock_task_store.get.return_value = initial_task
+    new_metadata = {"meta_key_test": "meta_value_test"}
+
+    event = TaskStatusUpdateEvent(
+        taskId=MINIMAL_TASK['id'],
+        contextId=MINIMAL_TASK['contextId'],
+        metadata=new_metadata,
+        status=TaskStatus(state=TaskState.working),
+        final=False,
+    )
+    await task_manager.save_task_event(event)
+
+    updated_task = mock_task_store.save.call_args.args[0]
+    assert updated_task.metadata == new_metadata
+
 
 @pytest.mark.asyncio
 async def test_ensure_task_existing(