chore: merge main into 1.0-dev

Author: ishymko

.github/workflows/python-publish.yml

@@ -26,7 +26,7 @@ jobs:
         run: uv build
 
       - name: Upload distributions
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: release-dists
           path: dist/
@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Retrieve release distributions
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: release-dists
           path: dist/

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.3.25](https://github.com/a2aproject/a2a-python/compare/v0.3.24...v0.3.25) (2026-03-10)
+
+
+### Features
+
+* Implement a vertex based task store ([#752](https://github.com/a2aproject/a2a-python/issues/752)) ([fa14dbf](https://github.com/a2aproject/a2a-python/commit/fa14dbf46b603f288a1f1c474401483bf53950e4))
+
+
+### Bug Fixes
+
+* return background task from consume_and_break_on_interrupt to prevent GC ([#775](https://github.com/a2aproject/a2a-python/issues/775)) ([a236d4d](https://github.com/a2aproject/a2a-python/commit/a236d4df8dceb2db1e1170e0b57599f3837ebd71))
+* use default_factory for mutable field defaults in ServerCallContext ([#744](https://github.com/a2aproject/a2a-python/issues/744)) ([22b25d6](https://github.com/a2aproject/a2a-python/commit/22b25d653e57e2d1453bbc282052e51dbd904ac6))
+
 ## [0.3.24](https://github.com/a2aproject/a2a-python/compare/v0.3.23...v0.3.24) (2026-02-20)
 
 

src/a2a/contrib/__init__.py

@@ -19,8 +19,8 @@ class ServerCallContext(BaseModel):
 
     model_config = ConfigDict(arbitrary_types_allowed=True)
 
-    state: State = Field(default={})
-    user: User = Field(default=UnauthenticatedUser())
+    state: State = Field(default_factory=dict)
+    user: User = Field(default_factory=UnauthenticatedUser)
     tenant: str = Field(default='')
     requested_extensions: set[str] = Field(default_factory=set)
     activated_extensions: set[str] = Field(default_factory=set)

src/a2a/server/context.py

@@ -351,12 +351,17 @@ async def push_notification_callback(event: Event) -> None:
             (
                 result,
                 interrupted_or_non_blocking,
+                bg_consume_task,
             ) = await result_aggregator.consume_and_break_on_interrupt(
                 consumer,
                 blocking=blocking,
                 event_callback=push_notification_callback,
             )
 
+            if bg_consume_task is not None:
+                bg_consume_task.set_name(f'continue_consuming:{task_id}')
+                self._track_background_task(bg_consume_task)
+
         except Exception:
             logger.exception('Agent execution failed')
             producer_task.cancel()

src/a2a/server/request_handlers/default_request_handler.py

@@ -99,7 +99,7 @@ async def consume_and_break_on_interrupt(
         consumer: EventConsumer,
         blocking: bool = True,
         event_callback: Callable[[Event], Awaitable[None]] | None = None,
-    ) -> tuple[Task | Message | None, bool]:
+    ) -> tuple[Task | Message | None, bool, asyncio.Task | None]:
         """Processes the event stream until completion or an interruptible state is encountered.
 
         If `blocking` is False, it returns after the first event that creates a Task or Message.
@@ -119,16 +119,23 @@ async def consume_and_break_on_interrupt(
             A tuple containing:
             - The current aggregated result (`Task` or `Message`) at the point of completion or interruption.
             - A boolean indicating whether the consumption was interrupted (`True`) or completed naturally (`False`).
+            - The background ``asyncio.Task`` that continues consuming events
+              after an interruption, or ``None`` when no background work was
+              spawned.  **Callers must hold a strong reference** to this task
+              (e.g. in a ``set``) to prevent the garbage collector from
+              collecting it before it finishes — the event loop only keeps
+              weak references to tasks.
 
         Raises:
             BaseException: If the `EventConsumer` raises an exception during consumption.
         """
         event_stream = consumer.consume_all()
         interrupted = False
+        bg_task: asyncio.Task | None = None
         async for event in event_stream:
             if isinstance(event, Message):
                 self._message = event
-                return event, False
+                return event, False, None
             await self.task_manager.process(event)
 
             if event_callback:
@@ -161,13 +168,13 @@ async def consume_and_break_on_interrupt(
 
             if should_interrupt:
                 # Continue consuming the rest of the events in the background.
-                # TODO: We should track all outstanding tasks to ensure they eventually complete.
-                asyncio.create_task(  # noqa: RUF006
+                # The caller is responsible for tracking this task to prevent GC.
+                bg_task = asyncio.create_task(
                     self._continue_consuming(event_stream, event_callback)
                 )
                 interrupted = True
                 break
-        return await self.task_manager.get_task(), interrupted
+        return await self.task_manager.get_task(), interrupted, bg_task
 
     async def _continue_consuming(
         self,

src/a2a/server/tasks/result_aggregator.py

@@ -15,6 +15,7 @@
     DefaultRequestHandler,
 )
 from a2a.server.tasks.inmemory_task_store import InMemoryTaskStore
+from a2a.server.tasks.task_store import TaskStore
 from a2a.types import (
     AgentCapabilities,
     AgentCard,
@@ -128,8 +129,8 @@ async def execute(
         await event_queue.enqueue_event(final_update)
 
 
-def main() -> None:
-    """Main entrypoint."""
+def serve(task_store: TaskStore) -> None:
+    """Sets up the A2A service and starts the HTTP server."""
     http_port = int(os.environ.get('HTTP_PORT', '41241'))
 
     agent_card = AgentCard(
@@ -168,7 +169,7 @@ def main() -> None:
 
     request_handler = DefaultRequestHandler(
         agent_executor=SUTAgentExecutor(),
-        task_store=InMemoryTaskStore(),
+        task_store=task_store,
     )
 
     server = A2AStarletteApplication(
@@ -182,5 +183,10 @@ def main() -> None:
     uvicorn.run(app, host='127.0.0.1', port=http_port, log_level='info')
 
 
+def main() -> None:
+    """Main entrypoint."""
+    serve(InMemoryTaskStore())
+
+
 if __name__ == '__main__':
     main()

tck/sut_agent.py

@@ -541,6 +541,7 @@ async def test_on_message_send_with_push_notification():
     mock_result_aggregator_instance.consume_and_break_on_interrupt.return_value = (
         final_task_result,
         False,
+        None,
     )
 
     # Mock the current_result async property to return the final task result
@@ -643,6 +644,7 @@ async def test_on_message_send_with_push_notification_in_non_blocking_request():
     mock_result_aggregator_instance.consume_and_break_on_interrupt.return_value = (
         initial_task,
         True,  # interrupted = True for non-blocking
+        MagicMock(spec=asyncio.Task),  # background task
     )
 
     # Mock the current_result async property to return the final task
@@ -666,7 +668,11 @@ async def mock_consume_and_break_on_interrupt(
         event_callback_received = event_callback
         if event_callback_received:
             await event_callback_received(final_task)
-        return initial_task, True  # interrupted = True for non-blocking
+        return (
+            initial_task,
+            True,
+            MagicMock(spec=asyncio.Task),
+        )  # interrupted = True for non-blocking
 
     mock_result_aggregator_instance.consume_and_break_on_interrupt = (
         mock_consume_and_break_on_interrupt
@@ -758,6 +764,7 @@ async def test_on_message_send_with_push_notification_no_existing_Task():
     mock_result_aggregator_instance.consume_and_break_on_interrupt.return_value = (
         final_task_result,
         False,
+        None,
     )
 
     # Mock the current_result async property to return the final task result
@@ -815,6 +822,7 @@ async def test_on_message_send_no_result_from_aggregator():
     mock_result_aggregator_instance.consume_and_break_on_interrupt.return_value = (
         None,
         False,
+        None,
     )
 
     with (
@@ -864,6 +872,7 @@ async def test_on_message_send_task_id_mismatch():
     mock_result_aggregator_instance.consume_and_break_on_interrupt.return_value = (
         mismatched_task,
         False,
+        None,
     )
 
     with (
@@ -1069,6 +1078,7 @@ async def test_on_message_send_interrupted_flow():
     mock_result_aggregator_instance.consume_and_break_on_interrupt.return_value = (
         interrupt_task_result,
         True,
+        MagicMock(spec=asyncio.Task),  # background task
     )  # Interrupted = True
 
     # Collect coroutines passed to create_task so we can close them

tests/contrib/__init__.py

@@ -231,12 +231,14 @@ async def mock_consume_generator():
         (
             result,
             interrupted,
+            bg_task,
         ) = await self.aggregator.consume_and_break_on_interrupt(
             self.mock_event_consumer
         )
 
         self.assertEqual(result, sample_message)
         self.assertFalse(interrupted)
+        self.assertIsNone(bg_task)
         self.mock_task_manager.process.assert_not_called()  # Process is not called for the Message if returned directly
         # _continue_consuming should not be called if it's a message interrupt
         # and no auth_required state.
@@ -268,12 +270,14 @@ async def mock_consume_generator():
         (
             result,
             interrupted,
+            bg_task,
         ) = await self.aggregator.consume_and_break_on_interrupt(
             self.mock_event_consumer
         )
 
         self.assertEqual(result, auth_task)
         self.assertTrue(interrupted)
+        self.assertIsNotNone(bg_task)
         self.mock_task_manager.process.assert_called_once_with(auth_task)
         mock_create_task.assert_called_once()  # Check that create_task was called
         # self.aggregator._continue_consuming is an AsyncMock.
@@ -322,12 +326,14 @@ async def mock_consume_generator():
         (
             result,
             interrupted,
+            bg_task,
         ) = await self.aggregator.consume_and_break_on_interrupt(
             self.mock_event_consumer
         )
 
         self.assertEqual(result, current_task_state_after_update)
         self.assertTrue(interrupted)
+        self.assertIsNotNone(bg_task)
         self.mock_task_manager.process.assert_called_once_with(
             auth_status_update
         )
@@ -358,13 +364,15 @@ async def mock_consume_generator():
         (
             result,
             interrupted,
+            bg_task,
         ) = await self.aggregator.consume_and_break_on_interrupt(
             self.mock_event_consumer
         )
 
         # If the first event is a Message, it's returned directly.
         self.assertEqual(result, event1)
         self.assertFalse(interrupted)
+        self.assertIsNone(bg_task)
         # process() is NOT called for the Message if it's the one causing the return
         self.mock_task_manager.process.assert_not_called()
         self.mock_task_manager.get_task.assert_not_called()
@@ -420,12 +428,14 @@ async def mock_consume_generator():
         (
             result,
             interrupted,
+            bg_task,
         ) = await self.aggregator.consume_and_break_on_interrupt(
             self.mock_event_consumer, blocking=False
         )
 
         self.assertEqual(result, first_event)
         self.assertTrue(interrupted)
+        self.assertIsNotNone(bg_task)
         self.mock_task_manager.process.assert_called_once_with(first_event)
         mock_create_task.assert_called_once()
         # The background task should be created with the remaining stream
@@ -474,7 +484,7 @@ async def initial_consume_generator():
         mock_create_task.side_effect = lambda coro: asyncio.ensure_future(coro)
 
         # Call the main method that triggers _continue_consuming via create_task
-        _, _ = await self.aggregator.consume_and_break_on_interrupt(
+        _, _, _ = await self.aggregator.consume_and_break_on_interrupt(
             self.mock_event_consumer
         )