diff --git a/dapr/ext/workflow/_durabletask/aio/client.py b/dapr/ext/workflow/_durabletask/aio/client.py
index a5da39b14..35f44c646 100644
--- a/dapr/ext/workflow/_durabletask/aio/client.py
+++ b/dapr/ext/workflow/_durabletask/aio/client.py
@@ -40,6 +40,7 @@
     WorkflowState,
     _TransientTimeout,
     new_orchestration_state,
+    new_task_router,
 )
 
 # If `opentelemetry-instrumentation-grpc` is available, enable the gRPC client interceptor
@@ -114,6 +115,7 @@ async def schedule_new_orchestration(
         instance_id: Optional[str] = None,
         start_at: Optional[datetime] = None,
         reuse_id_policy: Optional[WorkflowIdReusePolicy] = None,
+        app_id: Optional[str] = None,
     ) -> str:
         name = orchestrator if isinstance(orchestrator, str) else task.get_name(orchestrator)
 
@@ -125,6 +127,7 @@ async def schedule_new_orchestration(
             else None,
             scheduledStartTimestamp=helpers.new_timestamp(start_at) if start_at else None,
             version=helpers.get_string_value(None),
+            router=new_task_router(app_id),
         )
 
         self._logger.info(f"Starting new '{name}' instance with ID = '{req.instanceId}'.")
@@ -132,16 +135,33 @@ async def schedule_new_orchestration(
         return res.instanceId
 
     async def get_orchestration_state(
-        self, instance_id: str, *, fetch_payloads: bool = True
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
-        req = pb.GetInstanceRequest(instanceId=instance_id, getInputsAndOutputs=fetch_payloads)
+        req = pb.GetInstanceRequest(
+            instanceId=instance_id,
+            getInputsAndOutputs=fetch_payloads,
+            router=new_task_router(app_id),
+        )
         res: pb.GetInstanceResponse = await self._get_stub().GetInstance(req)
         return new_orchestration_state(req.instanceId, res)
 
     async def wait_for_orchestration_start(
-        self, instance_id: str, *, fetch_payloads: bool = False, timeout: Optional[int] = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = False,
+        timeout: Optional[int] = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
-        req = pb.GetInstanceRequest(instanceId=instance_id, getInputsAndOutputs=fetch_payloads)
+        req = pb.GetInstanceRequest(
+            instanceId=instance_id,
+            getInputsAndOutputs=fetch_payloads,
+            router=new_task_router(app_id),
+        )
         self._logger.info(
             f"Waiting {'indefinitely' if timeout in (0, None) else f'up to {timeout}s'} for instance '{instance_id}' to start."
         )
@@ -158,9 +178,18 @@ async def _call(grpc_timeout):
             raise TimeoutError('Timed-out waiting for the orchestration to start')
 
     async def wait_for_orchestration_completion(
-        self, instance_id: str, *, fetch_payloads: bool = True, timeout: Optional[int] = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        timeout: Optional[int] = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
-        req = pb.GetInstanceRequest(instanceId=instance_id, getInputsAndOutputs=fetch_payloads)
+        req = pb.GetInstanceRequest(
+            instanceId=instance_id,
+            getInputsAndOutputs=fetch_payloads,
+            router=new_task_router(app_id),
+        )
         self._logger.info(
             f"Waiting {'indefinitely' if timeout in (0, None) else f'up to {timeout}s'} for instance '{instance_id}' to complete."
         )
@@ -270,40 +299,78 @@ async def _call_with_transient_retry(self, instance_id, timeout, call_fn):
                         raise _TransientTimeout()
 
     async def raise_orchestration_event(
-        self, instance_id: str, event_name: str, *, data: Optional[Any] = None
+        self,
+        instance_id: str,
+        event_name: str,
+        *,
+        data: Optional[Any] = None,
+        app_id: Optional[str] = None,
     ):
         req = pb.RaiseEventRequest(
             instanceId=instance_id,
             name=event_name,
             input=wrappers_pb2.StringValue(value=shared.to_json(data)) if data else None,
+            router=new_task_router(app_id),
         )
 
         self._logger.info(f"Raising event '{event_name}' for instance '{instance_id}'.")
         await self._get_stub().RaiseEvent(req)
 
     async def terminate_orchestration(
-        self, instance_id: str, *, output: Optional[Any] = None, recursive: bool = True
+        self,
+        instance_id: str,
+        *,
+        output: Optional[Any] = None,
+        recursive: bool = True,
+        app_id: Optional[str] = None,
     ):
         req = pb.TerminateRequest(
             instanceId=instance_id,
             output=wrappers_pb2.StringValue(value=shared.to_json(output)) if output else None,
             recursive=recursive,
+            router=new_task_router(app_id),
         )
 
         self._logger.info(f"Terminating instance '{instance_id}'.")
         await self._get_stub().TerminateInstance(req)
 
-    async def suspend_orchestration(self, instance_id: str):
-        req = pb.SuspendRequest(instanceId=instance_id)
+    async def suspend_orchestration(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ):
+        req = pb.SuspendRequest(
+            instanceId=instance_id,
+            router=new_task_router(app_id),
+        )
         self._logger.info(f"Suspending instance '{instance_id}'.")
         await self._get_stub().SuspendInstance(req)
 
-    async def resume_orchestration(self, instance_id: str):
-        req = pb.ResumeRequest(instanceId=instance_id)
+    async def resume_orchestration(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ):
+        req = pb.ResumeRequest(
+            instanceId=instance_id,
+            router=new_task_router(app_id),
+        )
         self._logger.info(f"Resuming instance '{instance_id}'.")
         await self._get_stub().ResumeInstance(req)
 
-    async def purge_orchestration(self, instance_id: str, recursive: bool = True):
-        req = pb.PurgeInstancesRequest(instanceId=instance_id, recursive=recursive)
+    async def purge_orchestration(
+        self,
+        instance_id: str,
+        recursive: bool = True,
+        *,
+        app_id: Optional[str] = None,
+    ):
+        req = pb.PurgeInstancesRequest(
+            instanceId=instance_id,
+            recursive=recursive,
+            router=new_task_router(app_id),
+        )
         self._logger.info(f"Purging instance '{instance_id}'.")
         await self._get_stub().PurgeInstances(req)
diff --git a/dapr/ext/workflow/_durabletask/client.py b/dapr/ext/workflow/_durabletask/client.py
index 07e63d4a7..e3d11704d 100644
--- a/dapr/ext/workflow/_durabletask/client.py
+++ b/dapr/ext/workflow/_durabletask/client.py
@@ -109,6 +109,16 @@ def raise_if_failed(self):
             )
 
 
+def new_task_router(app_id: Optional[str]) -> Optional[pb.TaskRouter]:
+    """Builds a TaskRouter targeting another app, or None when no routing is requested.
+
+    Only the target app ID is set; the sidecar stamps sourceAppID.
+    """
+    if app_id is None:
+        return None
+    return pb.TaskRouter(targetAppID=app_id)
+
+
 class OrchestrationFailedError(Exception):
     def __init__(self, message: str, failure_details: task.FailureDetails):
         super().__init__(message)
@@ -210,6 +220,7 @@ def schedule_new_orchestration(
         instance_id: Optional[str] = None,
         start_at: Optional[datetime] = None,
         reuse_id_policy: Optional[WorkflowIdReusePolicy] = None,
+        app_id: Optional[str] = None,
     ) -> str:
         name = orchestrator if isinstance(orchestrator, str) else task.get_name(orchestrator)
 
@@ -223,6 +234,7 @@ def schedule_new_orchestration(
             input=input_pb,
             scheduledStartTimestamp=helpers.new_timestamp(start_at) if start_at else None,
             version=wrappers_pb2.StringValue(value=''),
+            router=new_task_router(app_id),
         )
 
         self._logger.info(f"Starting new '{name}' instance with ID = '{req.instanceId}'.")
@@ -230,16 +242,33 @@ def schedule_new_orchestration(
         return res.instanceId
 
     def get_orchestration_state(
-        self, instance_id: str, *, fetch_payloads: bool = True
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
-        req = pb.GetInstanceRequest(instanceId=instance_id, getInputsAndOutputs=fetch_payloads)
+        req = pb.GetInstanceRequest(
+            instanceId=instance_id,
+            getInputsAndOutputs=fetch_payloads,
+            router=new_task_router(app_id),
+        )
         res: pb.GetInstanceResponse = self._stub.GetInstance(req)
         return new_orchestration_state(req.instanceId, res)
 
     def wait_for_orchestration_start(
-        self, instance_id: str, *, fetch_payloads: bool = False, timeout: Optional[int] = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = False,
+        timeout: Optional[int] = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
-        req = pb.GetInstanceRequest(instanceId=instance_id, getInputsAndOutputs=fetch_payloads)
+        req = pb.GetInstanceRequest(
+            instanceId=instance_id,
+            getInputsAndOutputs=fetch_payloads,
+            router=new_task_router(app_id),
+        )
         self._logger.info(
             f"Waiting {'indefinitely' if timeout in (0, None) else f'up to {timeout}s'} for instance '{instance_id}' to start."
         )
@@ -254,9 +283,18 @@ def _call(grpc_timeout):
             raise TimeoutError('Timed-out waiting for the orchestration to start')
 
     def wait_for_orchestration_completion(
-        self, instance_id: str, *, fetch_payloads: bool = True, timeout: Optional[int] = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        timeout: Optional[int] = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
-        req = pb.GetInstanceRequest(instanceId=instance_id, getInputsAndOutputs=fetch_payloads)
+        req = pb.GetInstanceRequest(
+            instanceId=instance_id,
+            getInputsAndOutputs=fetch_payloads,
+            router=new_task_router(app_id),
+        )
         self._logger.info(
             f"Waiting {'indefinitely' if timeout in (0, None) else f'up to {timeout}s'} for instance '{instance_id}' to complete."
         )
@@ -393,40 +431,78 @@ def _call_with_transient_retry(self, instance_id, timeout, call_fn):
                         raise _TransientTimeout()
 
     def raise_orchestration_event(
-        self, instance_id: str, event_name: str, *, data: Optional[Any] = None
+        self,
+        instance_id: str,
+        event_name: str,
+        *,
+        data: Optional[Any] = None,
+        app_id: Optional[str] = None,
     ):
         req = pb.RaiseEventRequest(
             instanceId=instance_id,
             name=event_name,
             input=wrappers_pb2.StringValue(value=shared.to_json(data)) if data else None,
+            router=new_task_router(app_id),
         )
 
         self._logger.info(f"Raising event '{event_name}' for instance '{instance_id}'.")
         self._stub.RaiseEvent(req)
 
     def terminate_orchestration(
-        self, instance_id: str, *, output: Optional[Any] = None, recursive: bool = True
+        self,
+        instance_id: str,
+        *,
+        output: Optional[Any] = None,
+        recursive: bool = True,
+        app_id: Optional[str] = None,
     ):
         req = pb.TerminateRequest(
             instanceId=instance_id,
             output=wrappers_pb2.StringValue(value=shared.to_json(output)) if output else None,
             recursive=recursive,
+            router=new_task_router(app_id),
         )
 
         self._logger.info(f"Terminating instance '{instance_id}'.")
         self._stub.TerminateInstance(req)
 
-    def suspend_orchestration(self, instance_id: str):
-        req = pb.SuspendRequest(instanceId=instance_id)
+    def suspend_orchestration(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ):
+        req = pb.SuspendRequest(
+            instanceId=instance_id,
+            router=new_task_router(app_id),
+        )
         self._logger.info(f"Suspending instance '{instance_id}'.")
         self._stub.SuspendInstance(req)
 
-    def resume_orchestration(self, instance_id: str):
-        req = pb.ResumeRequest(instanceId=instance_id)
+    def resume_orchestration(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ):
+        req = pb.ResumeRequest(
+            instanceId=instance_id,
+            router=new_task_router(app_id),
+        )
         self._logger.info(f"Resuming instance '{instance_id}'.")
         self._stub.ResumeInstance(req)
 
-    def purge_orchestration(self, instance_id: str, recursive: bool = True):
-        req = pb.PurgeInstancesRequest(instanceId=instance_id, recursive=recursive)
+    def purge_orchestration(
+        self,
+        instance_id: str,
+        recursive: bool = True,
+        *,
+        app_id: Optional[str] = None,
+    ):
+        req = pb.PurgeInstancesRequest(
+            instanceId=instance_id,
+            recursive=recursive,
+            router=new_task_router(app_id),
+        )
         self._logger.info(f"Purging instance '{instance_id}'.")
         self._stub.PurgeInstances(req)
diff --git a/dapr/ext/workflow/_durabletask/internal/PROTO_SOURCE_COMMIT_HASH b/dapr/ext/workflow/_durabletask/internal/PROTO_SOURCE_COMMIT_HASH
index 08691e6da..41af5e2a0 100644
--- a/dapr/ext/workflow/_durabletask/internal/PROTO_SOURCE_COMMIT_HASH
+++ b/dapr/ext/workflow/_durabletask/internal/PROTO_SOURCE_COMMIT_HASH
@@ -1 +1 @@
-9d3681cb82a03aad057f361102d3a7e0ae638462
+f31a2a0523e01feda8f41cc22512ed70ee59b3ad
diff --git a/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.py b/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.py
index 7b43827ed..cae2467d1 100644
--- a/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.py
+++ b/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.py
@@ -28,7 +28,7 @@
 from google.protobuf import wrappers_pb2 as google_dot_protobuf_dot_wrappers__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x15\x62\x61\x63kend_service.proto\x12\x1d\x64urabletask.protos.backend.v1\x1a\x13orchestration.proto\x1a\x14history_events.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"T\n\x0f\x41\x64\x64\x45ventRequest\x12#\n\x08instance\x18\x01 \x01(\x0b\x32\x11.WorkflowInstance\x12\x1c\n\x05\x65vent\x18\x02 \x01(\x0b\x32\r.HistoryEvent\"\x12\n\x10\x41\x64\x64\x45ventResponse\"`\n\x1f\x43ompleteActivityWorkItemRequest\x12\x17\n\x0f\x63ompletionToken\x18\x01 \x01(\t\x12$\n\rresponseEvent\x18\x02 \x01(\x0b\x32\r.HistoryEvent\"\"\n CompleteActivityWorkItemResponse\"\xa4\x03\n\x1f\x43ompleteWorkflowWorkItemRequest\x12\x17\n\x0f\x63ompletionToken\x18\x01 \x01(\t\x12#\n\x08instance\x18\x02 \x01(\x0b\x32\x11.WorkflowInstance\x12+\n\rruntimeStatus\x18\x03 \x01(\x0e\x32\x14.OrchestrationStatus\x12\x32\n\x0c\x63ustomStatus\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12!\n\nnewHistory\x18\x05 \x03(\x0b\x32\r.HistoryEvent\x12\x1f\n\x08newTasks\x18\x06 \x03(\x0b\x32\r.HistoryEvent\x12 \n\tnewTimers\x18\x07 \x03(\x0b\x32\r.HistoryEvent\x12\x43\n\x0bnewMessages\x18\x08 \x03(\x0b\x32..durabletask.protos.backend.v1.WorkflowMessage\x12\x37\n\x12numEventsProcessed\x18\t \x01(\x0b\x32\x1b.google.protobuf.Int32Value\"\"\n CompleteWorkflowWorkItemResponse\"T\n\x0fWorkflowMessage\x12#\n\x08instance\x18\x01 \x01(\x0b\x32\x11.WorkflowInstance\x12\x1c\n\x05\x65vent\x18\x02 \x01(\x0b\x32\r.HistoryEvent\"\x9c\x01\n\x14\x42\x61\x63kendWorkflowState\x12\x1c\n\x05inbox\x18\x01 \x03(\x0b\x32\r.HistoryEvent\x12\x1e\n\x07history\x18\x02 \x03(\x0b\x32\r.HistoryEvent\x12\x32\n\x0c\x63ustomStatus\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x12\n\ngeneration\x18\x04 \x01(\x04\"\x83\x01\n\x12\x41\x63tivityInvocation\x12#\n\x0chistoryEvent\x18\x01 \x01(\x0b\x32\r.HistoryEvent\x12\x32\n\x11propagatedHistory\x18\x02 \x01(\x0b\x32\x12.PropagatedHistoryH\x00\x88\x01\x01\x42\x14\n\x12_propagatedHistory\"\x9a\x01\n\x1d\x43reateWorkflowInstanceRequest\x12!\n\nstartEvent\x18\x01 \x01(\x0b\x32\r.HistoryEvent\x12\x32\n\x11propagatedHistory\x18\x03 \x01(\x0b\x32\x12.PropagatedHistoryH\x00\x88\x01\x01\x42\x14\n\x12_propagatedHistoryJ\x04\x08\x02\x10\x03R\x06policy\"\x94\x05\n\x10WorkflowMetadata\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12+\n\rruntimeStatus\x18\x03 \x01(\x0e\x32\x14.OrchestrationStatus\x12-\n\tcreatedAt\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x31\n\rlastUpdatedAt\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12+\n\x05input\x18\x06 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12,\n\x06output\x18\x07 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x32\n\x0c\x63ustomStatus\x18\x08 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x0e\x66\x61ilureDetails\x18\t \x01(\x0b\x32\x13.TaskFailureDetails\x12/\n\x0b\x63ompletedAt\x18\n \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x18\n\x10parentInstanceId\x18\x0b \x01(\t\x12\x32\n\x07version\x18\x0c \x01(\x0b\x32\x1c.google.protobuf.StringValueH\x00\x88\x01\x01\x12\x36\n\x0bparentAppId\x18\r \x01(\x0b\x32\x1c.google.protobuf.StringValueH\x01\x88\x01\x01\x12\x32\n\tstartedAt\x18\x0e \x01(\x0b\x32\x1a.google.protobuf.TimestampH\x02\x88\x01\x01\x42\n\n\x08_versionB\x0e\n\x0c_parentAppIdB\x0c\n\n_startedAt\"\xc3\x01\n\x1c\x42\x61\x63kendWorkflowStateMetadata\x12\x13\n\x0binboxLength\x18\x01 \x01(\x04\x12\x15\n\rhistoryLength\x18\x02 \x01(\x04\x12\x12\n\ngeneration\x18\x03 \x01(\x04\x12\x17\n\x0fsignatureLength\x18\x04 \x01(\x04\x12 \n\x18signingCertificateLength\x18\x05 \x01(\x04\x12(\n externalSigningCertificateLength\x18\x06 \x01(\x04\")\n\x12SigningCertificate\x12\x13\n\x0b\x63\x65rtificate\x18\x01 \x01(\x0c\"\xc4\x01\n\x10HistorySignature\x12\x17\n\x0fstartEventIndex\x18\x01 \x01(\x04\x12\x12\n\neventCount\x18\x02 \x01(\x04\x12$\n\x17previousSignatureDigest\x18\x03 \x01(\x0cH\x00\x88\x01\x01\x12\x14\n\x0c\x65ventsDigest\x18\x04 \x01(\x0c\x12\x18\n\x10\x63\x65rtificateIndex\x18\x05 \x01(\x04\x12\x11\n\tsignature\x18\x06 \x01(\x0c\x42\x1a\n\x18_previousSignatureDigest\"E\n\x0c\x44urableTimer\x12!\n\ntimerEvent\x18\x01 \x01(\x0b\x32\r.HistoryEvent\x12\x12\n\ngeneration\x18\x02 \x01(\x04\x42V\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x15\x62\x61\x63kend_service.proto\x12\x1d\x64urabletask.protos.backend.v1\x1a\x13orchestration.proto\x1a\x14history_events.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"T\n\x0f\x41\x64\x64\x45ventRequest\x12#\n\x08instance\x18\x01 \x01(\x0b\x32\x11.WorkflowInstance\x12\x1c\n\x05\x65vent\x18\x02 \x01(\x0b\x32\r.HistoryEvent\"\x12\n\x10\x41\x64\x64\x45ventResponse\"`\n\x1f\x43ompleteActivityWorkItemRequest\x12\x17\n\x0f\x63ompletionToken\x18\x01 \x01(\t\x12$\n\rresponseEvent\x18\x02 \x01(\x0b\x32\r.HistoryEvent\"\"\n CompleteActivityWorkItemResponse\"\xa4\x03\n\x1f\x43ompleteWorkflowWorkItemRequest\x12\x17\n\x0f\x63ompletionToken\x18\x01 \x01(\t\x12#\n\x08instance\x18\x02 \x01(\x0b\x32\x11.WorkflowInstance\x12+\n\rruntimeStatus\x18\x03 \x01(\x0e\x32\x14.OrchestrationStatus\x12\x32\n\x0c\x63ustomStatus\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12!\n\nnewHistory\x18\x05 \x03(\x0b\x32\r.HistoryEvent\x12\x1f\n\x08newTasks\x18\x06 \x03(\x0b\x32\r.HistoryEvent\x12 \n\tnewTimers\x18\x07 \x03(\x0b\x32\r.HistoryEvent\x12\x43\n\x0bnewMessages\x18\x08 \x03(\x0b\x32..durabletask.protos.backend.v1.WorkflowMessage\x12\x37\n\x12numEventsProcessed\x18\t \x01(\x0b\x32\x1b.google.protobuf.Int32Value\"\"\n CompleteWorkflowWorkItemResponse\"T\n\x0fWorkflowMessage\x12#\n\x08instance\x18\x01 \x01(\x0b\x32\x11.WorkflowInstance\x12\x1c\n\x05\x65vent\x18\x02 \x01(\x0b\x32\r.HistoryEvent\"\x9c\x01\n\x14\x42\x61\x63kendWorkflowState\x12\x1c\n\x05inbox\x18\x01 \x03(\x0b\x32\r.HistoryEvent\x12\x1e\n\x07history\x18\x02 \x03(\x0b\x32\r.HistoryEvent\x12\x32\n\x0c\x63ustomStatus\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x12\n\ngeneration\x18\x04 \x01(\x04\"\x83\x01\n\x12\x41\x63tivityInvocation\x12#\n\x0chistoryEvent\x18\x01 \x01(\x0b\x32\r.HistoryEvent\x12\x32\n\x11propagatedHistory\x18\x02 \x01(\x0b\x32\x12.PropagatedHistoryH\x00\x88\x01\x01\x42\x14\n\x12_propagatedHistory\"\xbb\x01\n\x1d\x43reateWorkflowInstanceRequest\x12!\n\nstartEvent\x18\x01 \x01(\x0b\x32\r.HistoryEvent\x12\x32\n\x11propagatedHistory\x18\x03 \x01(\x0b\x32\x12.PropagatedHistoryH\x00\x88\x01\x01\x12\x1f\n\x17\x65nforceUniqueInstanceId\x18\x04 \x01(\x08\x42\x14\n\x12_propagatedHistoryJ\x04\x08\x02\x10\x03R\x06policy\"\x94\x05\n\x10WorkflowMetadata\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12+\n\rruntimeStatus\x18\x03 \x01(\x0e\x32\x14.OrchestrationStatus\x12-\n\tcreatedAt\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x31\n\rlastUpdatedAt\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12+\n\x05input\x18\x06 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12,\n\x06output\x18\x07 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x32\n\x0c\x63ustomStatus\x18\x08 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x0e\x66\x61ilureDetails\x18\t \x01(\x0b\x32\x13.TaskFailureDetails\x12/\n\x0b\x63ompletedAt\x18\n \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x18\n\x10parentInstanceId\x18\x0b \x01(\t\x12\x32\n\x07version\x18\x0c \x01(\x0b\x32\x1c.google.protobuf.StringValueH\x00\x88\x01\x01\x12\x36\n\x0bparentAppId\x18\r \x01(\x0b\x32\x1c.google.protobuf.StringValueH\x01\x88\x01\x01\x12\x32\n\tstartedAt\x18\x0e \x01(\x0b\x32\x1a.google.protobuf.TimestampH\x02\x88\x01\x01\x42\n\n\x08_versionB\x0e\n\x0c_parentAppIdB\x0c\n\n_startedAt\"\xc3\x01\n\x1c\x42\x61\x63kendWorkflowStateMetadata\x12\x13\n\x0binboxLength\x18\x01 \x01(\x04\x12\x15\n\rhistoryLength\x18\x02 \x01(\x04\x12\x12\n\ngeneration\x18\x03 \x01(\x04\x12\x17\n\x0fsignatureLength\x18\x04 \x01(\x04\x12 \n\x18signingCertificateLength\x18\x05 \x01(\x04\x12(\n externalSigningCertificateLength\x18\x06 \x01(\x04\")\n\x12SigningCertificate\x12\x13\n\x0b\x63\x65rtificate\x18\x01 \x01(\x0c\"\xc4\x01\n\x10HistorySignature\x12\x17\n\x0fstartEventIndex\x18\x01 \x01(\x04\x12\x12\n\neventCount\x18\x02 \x01(\x04\x12$\n\x17previousSignatureDigest\x18\x03 \x01(\x0cH\x00\x88\x01\x01\x12\x14\n\x0c\x65ventsDigest\x18\x04 \x01(\x0c\x12\x18\n\x10\x63\x65rtificateIndex\x18\x05 \x01(\x04\x12\x11\n\tsignature\x18\x06 \x01(\x0c\x42\x1a\n\x18_previousSignatureDigest\"E\n\x0c\x44urableTimer\x12!\n\ntimerEvent\x18\x01 \x01(\x0b\x32\r.HistoryEvent\x12\x12\n\ngeneration\x18\x02 \x01(\x04\x42V\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -55,15 +55,15 @@
   _globals['_ACTIVITYINVOCATION']._serialized_start=1109
   _globals['_ACTIVITYINVOCATION']._serialized_end=1240
   _globals['_CREATEWORKFLOWINSTANCEREQUEST']._serialized_start=1243
-  _globals['_CREATEWORKFLOWINSTANCEREQUEST']._serialized_end=1397
-  _globals['_WORKFLOWMETADATA']._serialized_start=1400
-  _globals['_WORKFLOWMETADATA']._serialized_end=2060
-  _globals['_BACKENDWORKFLOWSTATEMETADATA']._serialized_start=2063
-  _globals['_BACKENDWORKFLOWSTATEMETADATA']._serialized_end=2258
-  _globals['_SIGNINGCERTIFICATE']._serialized_start=2260
-  _globals['_SIGNINGCERTIFICATE']._serialized_end=2301
-  _globals['_HISTORYSIGNATURE']._serialized_start=2304
-  _globals['_HISTORYSIGNATURE']._serialized_end=2500
-  _globals['_DURABLETIMER']._serialized_start=2502
-  _globals['_DURABLETIMER']._serialized_end=2571
+  _globals['_CREATEWORKFLOWINSTANCEREQUEST']._serialized_end=1430
+  _globals['_WORKFLOWMETADATA']._serialized_start=1433
+  _globals['_WORKFLOWMETADATA']._serialized_end=2093
+  _globals['_BACKENDWORKFLOWSTATEMETADATA']._serialized_start=2096
+  _globals['_BACKENDWORKFLOWSTATEMETADATA']._serialized_end=2291
+  _globals['_SIGNINGCERTIFICATE']._serialized_start=2293
+  _globals['_SIGNINGCERTIFICATE']._serialized_end=2334
+  _globals['_HISTORYSIGNATURE']._serialized_start=2337
+  _globals['_HISTORYSIGNATURE']._serialized_end=2533
+  _globals['_DURABLETIMER']._serialized_start=2535
+  _globals['_DURABLETIMER']._serialized_end=2604
 # @@protoc_insertion_point(module_scope)
diff --git a/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.pyi b/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.pyi
index 08f6d2d58..c4d2739ab 100644
--- a/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.pyi
+++ b/dapr/ext/workflow/_durabletask/internal/backend_service_pb2.pyi
@@ -277,6 +277,12 @@ class CreateWorkflowInstanceRequest(_message.Message):
 
     STARTEVENT_FIELD_NUMBER: _builtins.int
     PROPAGATEDHISTORY_FIELD_NUMBER: _builtins.int
+    ENFORCEUNIQUEINSTANCEID_FIELD_NUMBER: _builtins.int
+    enforceUniqueInstanceId: _builtins.bool
+    """When true, the request fails with an ALREADY_EXISTS error if a workflow
+    instance with the same instanceId already exists, whether active or
+    completed. When false, an existing completed instance is restarted.
+    """
     @_builtins.property
     def startEvent(self) -> _history_events_pb2.HistoryEvent: ...
     @_builtins.property
@@ -288,10 +294,11 @@ class CreateWorkflowInstanceRequest(_message.Message):
         *,
         startEvent: _history_events_pb2.HistoryEvent | None = ...,
         propagatedHistory: _history_events_pb2.PropagatedHistory | None = ...,
+        enforceUniqueInstanceId: _builtins.bool = ...,
     ) -> None: ...
     _HasFieldArgType: _TypeAlias = _typing.Literal["_propagatedHistory", b"_propagatedHistory", "propagatedHistory", b"propagatedHistory", "startEvent", b"startEvent"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_propagatedHistory", b"_propagatedHistory", "propagatedHistory", b"propagatedHistory", "startEvent", b"startEvent"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_propagatedHistory", b"_propagatedHistory", "enforceUniqueInstanceId", b"enforceUniqueInstanceId", "propagatedHistory", b"propagatedHistory", "startEvent", b"startEvent"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__propagatedHistory: _TypeAlias = _typing.Literal["propagatedHistory"]  # noqa: Y015
     _WhichOneofArgType__propagatedHistory: _TypeAlias = _typing.Literal["_propagatedHistory", b"_propagatedHistory"]  # noqa: Y015
diff --git a/dapr/ext/workflow/_durabletask/internal/helpers.py b/dapr/ext/workflow/_durabletask/internal/helpers.py
index 387a9ee10..56ab04461 100644
--- a/dapr/ext/workflow/_durabletask/internal/helpers.py
+++ b/dapr/ext/workflow/_durabletask/internal/helpers.py
@@ -200,10 +200,11 @@ def new_schedule_task_action(
     task_execution_id: str = '',
     propagation_scope: Optional[int] = None,
 ) -> pb.WorkflowAction:
+    # Routing is carried by the enclosing WorkflowAction.router; the inner
+    # ScheduleTaskAction router field is reserved in the protos.
     schedule = pb.ScheduleTaskAction(
         name=name,
         input=get_string_value(encoded_input),
-        router=router,
         taskExecutionId=task_execution_id,
     )
     if propagation_scope is not None:
@@ -229,11 +230,12 @@ def new_create_child_workflow_action(
     router: Optional[pb.TaskRouter] = None,
     propagation_scope: Optional[int] = None,
 ) -> pb.WorkflowAction:
+    # Routing is carried by the enclosing WorkflowAction.router; the inner
+    # CreateChildWorkflowAction router field is reserved in the protos.
     child = pb.CreateChildWorkflowAction(
         name=name,
         instanceId=instance_id,
         input=get_string_value(encoded_input),
-        router=router,
     )
     if propagation_scope is not None:
         child.historyPropagationScope = propagation_scope
diff --git a/dapr/ext/workflow/_durabletask/internal/history_events_pb2.py b/dapr/ext/workflow/_durabletask/internal/history_events_pb2.py
index b70c3a5f5..472616d37 100644
--- a/dapr/ext/workflow/_durabletask/internal/history_events_pb2.py
+++ b/dapr/ext/workflow/_durabletask/internal/history_events_pb2.py
@@ -28,7 +28,7 @@
 from google.protobuf import wrappers_pb2 as google_dot_protobuf_dot_wrappers__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x14history_events.proto\x1a\x13orchestration.proto\x1a\x11\x61ttestation.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"\xd6\x03\n\x15\x45xecutionStartedEvent\x12\x0c\n\x04name\x18\x01 \x01(\t\x12-\n\x07version\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x10workflowInstance\x18\x04 \x01(\x0b\x32\x11.WorkflowInstance\x12+\n\x0eparentInstance\x18\x05 \x01(\x0b\x32\x13.ParentInstanceInfo\x12;\n\x17scheduledStartTimestamp\x18\x06 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12)\n\x12parentTraceContext\x18\x07 \x01(\x0b\x32\r.TraceContext\x12\x34\n\x0eworkflowSpanID\x18\x08 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12.\n\x04tags\x18\t \x03(\x0b\x32 .ExecutionStartedEvent.TagsEntry\x1a+\n\tTagsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 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\x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x32\n\x10\x65xecutionStarted\x18\x03 \x01(\x0b\x32\x16.ExecutionStartedEventH\x00\x12\x36\n\x12\x65xecutionCompleted\x18\x04 \x01(\x0b\x32\x18.ExecutionCompletedEventH\x00\x12\x38\n\x13\x65xecutionTerminated\x18\x05 \x01(\x0b\x32\x19.ExecutionTerminatedEventH\x00\x12,\n\rtaskScheduled\x18\x06 \x01(\x0b\x32\x13.TaskScheduledEventH\x00\x12,\n\rtaskCompleted\x18\x07 \x01(\x0b\x32\x13.TaskCompletedEventH\x00\x12&\n\ntaskFailed\x18\x08 \x01(\x0b\x32\x10.TaskFailedEventH\x00\x12J\n\x1c\x63hildWorkflowInstanceCreated\x18\t \x01(\x0b\x32\".ChildWorkflowInstanceCreatedEventH\x00\x12N\n\x1e\x63hildWorkflowInstanceCompleted\x18\n \x01(\x0b\x32$.ChildWorkflowInstanceCompletedEventH\x00\x12H\n\x1b\x63hildWorkflowInstanceFailed\x18\x0b \x01(\x0b\x32!.ChildWorkflowInstanceFailedEventH\x00\x12*\n\x0ctimerCreated\x18\x0c \x01(\x0b\x32\x12.TimerCreatedEventH\x00\x12&\n\ntimerFired\x18\r \x01(\x0b\x32\x10.TimerFiredEventH\x00\x12\x30\n\x0fworkflowStarted\x18\x0e \x01(\x0b\x32\x15.WorkflowStartedEventH\x00\x12\x34\n\x11workflowCompleted\x18\x0f \x01(\x0b\x32\x17.WorkflowCompletedEventH\x00\x12$\n\teventSent\x18\x10 \x01(\x0b\x32\x0f.EventSentEventH\x00\x12(\n\x0b\x65ventRaised\x18\x11 \x01(\x0b\x32\x11.EventRaisedEventH\x00\x12,\n\rcontinueAsNew\x18\x14 \x01(\x0b\x32\x13.ContinueAsNewEventH\x00\x12\x36\n\x12\x65xecutionSuspended\x18\x15 \x01(\x0b\x32\x18.ExecutionSuspendedEventH\x00\x12\x32\n\x10\x65xecutionResumed\x18\x16 \x01(\x0b\x32\x16.ExecutionResumedEventH\x00\x12\x32\n\x10\x65xecutionStalled\x18\x1f \x01(\x0b\x32\x16.ExecutionStalledEventH\x00\x12P\n\x1f\x64\x65tachedWorkflowInstanceCreated\x18  \x01(\x0b\x32%.DetachedWorkflowInstanceCreatedEventH\x00\x12 \n\x06router\x18\x1e \x01(\x0b\x32\x0b.TaskRouterH\x01\x88\x01\x01\x42\x0b\n\teventTypeB\t\n\x07_routerJ\x04\x08\x12\x10\x13J\x04\x08\x13\x10\x14J\x04\x08\x17\x10\x18J\x04\x08\x18\x10\x19J\x04\x08\x19\x10\x1aJ\x04\x08\x1a\x10\x1bJ\x04\x08\x1b\x10\x1cJ\x04\x08\x1c\x10\x1dJ\x04\x08\x1d\x10\x1e\"\x96\x01\n\x16PropagatedHistoryChunk\x12\x11\n\trawEvents\x18\x01 \x03(\x0c\x12\r\n\x05\x61ppId\x18\x02 \x01(\t\x12\x12\n\ninstanceId\x18\x03 \x01(\t\x12\x14\n\x0cworkflowName\x18\x04 \x01(\t\x12\x15\n\rrawSignatures\x18\x05 \x03(\x0c\x12\x19\n\x11signingCertChains\x18\x06 \x03(\x0c\"e\n\x11PropagatedHistory\x12\'\n\x05scope\x18\x01 \x01(\x0e\x32\x18.HistoryPropagationScope\x12\'\n\x06\x63hunks\x18\x02 \x03(\x0b\x32\x17.PropagatedHistoryChunkBV\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -53,45 +53,45 @@
   _globals['_TASKFAILEDEVENT']._serialized_start=1486
   _globals['_TASKFAILEDEVENT']._serialized_end=1726
   _globals['_CHILDWORKFLOWINSTANCECREATEDEVENT']._serialized_start=1729
-  _globals['_CHILDWORKFLOWINSTANCECREATEDEVENT']._serialized_end=2117
-  _globals['_CHILDWORKFLOWINSTANCECOMPLETEDEVENT']._serialized_start=2120
-  _globals['_CHILDWORKFLOWINSTANCECOMPLETEDEVENT']._serialized_end=2353
-  _globals['_CHILDWORKFLOWINSTANCEFAILEDEVENT']._serialized_start=2356
-  _globals['_CHILDWORKFLOWINSTANCEFAILEDEVENT']._serialized_end=2585
-  _globals['_DETACHEDWORKFLOWINSTANCECREATEDEVENT']._serialized_start=2587
-  _globals['_DETACHEDWORKFLOWINSTANCECREATEDEVENT']._serialized_end=2645
-  _globals['_TIMERORIGINCREATETIMER']._serialized_start=2647
-  _globals['_TIMERORIGINCREATETIMER']._serialized_end=2671
-  _globals['_TIMERORIGINEXTERNALEVENT']._serialized_start=2673
-  _globals['_TIMERORIGINEXTERNALEVENT']._serialized_end=2713
-  _globals['_TIMERORIGINACTIVITYRETRY']._serialized_start=2715
-  _globals['_TIMERORIGINACTIVITYRETRY']._serialized_end=2766
-  _globals['_TIMERORIGINCHILDWORKFLOWRETRY']._serialized_start=2768
-  _globals['_TIMERORIGINCHILDWORKFLOWRETRY']._serialized_end=2819
-  _globals['_TIMERCREATEDEVENT']._serialized_start=2822
-  _globals['_TIMERCREATEDEVENT']._serialized_end=3229
-  _globals['_TIMERFIREDEVENT']._serialized_start=3231
-  _globals['_TIMERFIREDEVENT']._serialized_end=3309
-  _globals['_WORKFLOWSTARTEDEVENT']._serialized_start=3311
-  _globals['_WORKFLOWSTARTEDEVENT']._serialized_end=3385
-  _globals['_WORKFLOWCOMPLETEDEVENT']._serialized_start=3387
-  _globals['_WORKFLOWCOMPLETEDEVENT']._serialized_end=3411
-  _globals['_EVENTSENTEVENT']._serialized_start=3413
-  _globals['_EVENTSENTEVENT']._serialized_end=3508
-  _globals['_EVENTRAISEDEVENT']._serialized_start=3510
-  _globals['_EVENTRAISEDEVENT']._serialized_end=3587
-  _globals['_CONTINUEASNEWEVENT']._serialized_start=3589
-  _globals['_CONTINUEASNEWEVENT']._serialized_end=3654
-  _globals['_EXECUTIONSUSPENDEDEVENT']._serialized_start=3656
-  _globals['_EXECUTIONSUSPENDEDEVENT']._serialized_end=3726
-  _globals['_EXECUTIONRESUMEDEVENT']._serialized_start=3728
-  _globals['_EXECUTIONRESUMEDEVENT']._serialized_end=3796
-  _globals['_EXECUTIONSTALLEDEVENT']._serialized_start=3798
-  _globals['_EXECUTIONSTALLEDEVENT']._serialized_end=3895
-  _globals['_HISTORYEVENT']._serialized_start=3898
-  _globals['_HISTORYEVENT']._serialized_end=5172
-  _globals['_PROPAGATEDHISTORYCHUNK']._serialized_start=5175
-  _globals['_PROPAGATEDHISTORYCHUNK']._serialized_end=5325
-  _globals['_PROPAGATEDHISTORY']._serialized_start=5327
-  _globals['_PROPAGATEDHISTORY']._serialized_end=5428
+  _globals['_CHILDWORKFLOWINSTANCECREATEDEVENT']._serialized_end=2209
+  _globals['_CHILDWORKFLOWINSTANCECOMPLETEDEVENT']._serialized_start=2212
+  _globals['_CHILDWORKFLOWINSTANCECOMPLETEDEVENT']._serialized_end=2445
+  _globals['_CHILDWORKFLOWINSTANCEFAILEDEVENT']._serialized_start=2448
+  _globals['_CHILDWORKFLOWINSTANCEFAILEDEVENT']._serialized_end=2677
+  _globals['_DETACHEDWORKFLOWINSTANCECREATEDEVENT']._serialized_start=2679
+  _globals['_DETACHEDWORKFLOWINSTANCECREATEDEVENT']._serialized_end=2737
+  _globals['_TIMERORIGINCREATETIMER']._serialized_start=2739
+  _globals['_TIMERORIGINCREATETIMER']._serialized_end=2763
+  _globals['_TIMERORIGINEXTERNALEVENT']._serialized_start=2765
+  _globals['_TIMERORIGINEXTERNALEVENT']._serialized_end=2805
+  _globals['_TIMERORIGINACTIVITYRETRY']._serialized_start=2807
+  _globals['_TIMERORIGINACTIVITYRETRY']._serialized_end=2858
+  _globals['_TIMERORIGINCHILDWORKFLOWRETRY']._serialized_start=2860
+  _globals['_TIMERORIGINCHILDWORKFLOWRETRY']._serialized_end=2911
+  _globals['_TIMERCREATEDEVENT']._serialized_start=2914
+  _globals['_TIMERCREATEDEVENT']._serialized_end=3321
+  _globals['_TIMERFIREDEVENT']._serialized_start=3323
+  _globals['_TIMERFIREDEVENT']._serialized_end=3401
+  _globals['_WORKFLOWSTARTEDEVENT']._serialized_start=3403
+  _globals['_WORKFLOWSTARTEDEVENT']._serialized_end=3477
+  _globals['_WORKFLOWCOMPLETEDEVENT']._serialized_start=3479
+  _globals['_WORKFLOWCOMPLETEDEVENT']._serialized_end=3503
+  _globals['_EVENTSENTEVENT']._serialized_start=3505
+  _globals['_EVENTSENTEVENT']._serialized_end=3600
+  _globals['_EVENTRAISEDEVENT']._serialized_start=3602
+  _globals['_EVENTRAISEDEVENT']._serialized_end=3679
+  _globals['_CONTINUEASNEWEVENT']._serialized_start=3681
+  _globals['_CONTINUEASNEWEVENT']._serialized_end=3746
+  _globals['_EXECUTIONSUSPENDEDEVENT']._serialized_start=3748
+  _globals['_EXECUTIONSUSPENDEDEVENT']._serialized_end=3818
+  _globals['_EXECUTIONRESUMEDEVENT']._serialized_start=3820
+  _globals['_EXECUTIONRESUMEDEVENT']._serialized_end=3888
+  _globals['_EXECUTIONSTALLEDEVENT']._serialized_start=3890
+  _globals['_EXECUTIONSTALLEDEVENT']._serialized_end=3987
+  _globals['_HISTORYEVENT']._serialized_start=3990
+  _globals['_HISTORYEVENT']._serialized_end=5264
+  _globals['_PROPAGATEDHISTORYCHUNK']._serialized_start=5267
+  _globals['_PROPAGATEDHISTORYCHUNK']._serialized_end=5417
+  _globals['_PROPAGATEDHISTORY']._serialized_start=5419
+  _globals['_PROPAGATEDHISTORY']._serialized_end=5520
 # @@protoc_insertion_point(module_scope)
diff --git a/dapr/ext/workflow/_durabletask/internal/history_events_pb2.pyi b/dapr/ext/workflow/_durabletask/internal/history_events_pb2.pyi
index c2676d8a7..e4e066155 100644
--- a/dapr/ext/workflow/_durabletask/internal/history_events_pb2.pyi
+++ b/dapr/ext/workflow/_durabletask/internal/history_events_pb2.pyi
@@ -303,6 +303,7 @@ class ChildWorkflowInstanceCreatedEvent(_message.Message):
     PARENTTRACECONTEXT_FIELD_NUMBER: _builtins.int
     RERUNPARENTINSTANCEINFO_FIELD_NUMBER: _builtins.int
     HISTORYPROPAGATIONSCOPE_FIELD_NUMBER: _builtins.int
+    RETRYPARENTINSTANCEINFO_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     name: _builtins.str
     historyPropagationScope: _orchestration_pb2.HistoryPropagationScope.ValueType
@@ -322,6 +323,15 @@ class ChildWorkflowInstanceCreatedEvent(_message.Message):
         workflow execution as the result of a rerun operation.
         """
 
+    @_builtins.property
+    def retryParentInstanceInfo(self) -> _orchestration_pb2.RetryParentInstanceInfo:
+        """If defined, indicates that this child workflow is a retry attempt and
+        links it back to the first attempt in the retry chain. Absent on the
+        first attempt. Consumers correlate retry attempts by grouping on
+        retryParentInstanceInfo.instanceID when present, otherwise on this
+        event's own instanceId.
+        """
+
     def __init__(
         self,
         *,
@@ -332,19 +342,24 @@ class ChildWorkflowInstanceCreatedEvent(_message.Message):
         parentTraceContext: _orchestration_pb2.TraceContext | None = ...,
         rerunParentInstanceInfo: _orchestration_pb2.RerunParentInstanceInfo | None = ...,
         historyPropagationScope: _orchestration_pb2.HistoryPropagationScope.ValueType | None = ...,
+        retryParentInstanceInfo: _orchestration_pb2.RetryParentInstanceInfo | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_rerunParentInstanceInfo", b"_rerunParentInstanceInfo", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "parentTraceContext", b"parentTraceContext", "rerunParentInstanceInfo", b"rerunParentInstanceInfo", "version", b"version"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_rerunParentInstanceInfo", b"_rerunParentInstanceInfo", "_retryParentInstanceInfo", b"_retryParentInstanceInfo", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "parentTraceContext", b"parentTraceContext", "rerunParentInstanceInfo", b"rerunParentInstanceInfo", "retryParentInstanceInfo", b"retryParentInstanceInfo", "version", b"version"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_rerunParentInstanceInfo", b"_rerunParentInstanceInfo", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "instanceId", b"instanceId", "name", b"name", "parentTraceContext", b"parentTraceContext", "rerunParentInstanceInfo", b"rerunParentInstanceInfo", "version", b"version"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_rerunParentInstanceInfo", b"_rerunParentInstanceInfo", "_retryParentInstanceInfo", b"_retryParentInstanceInfo", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "instanceId", b"instanceId", "name", b"name", "parentTraceContext", b"parentTraceContext", "rerunParentInstanceInfo", b"rerunParentInstanceInfo", "retryParentInstanceInfo", b"retryParentInstanceInfo", "version", b"version"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__historyPropagationScope: _TypeAlias = _typing.Literal["historyPropagationScope"]  # noqa: Y015
     _WhichOneofArgType__historyPropagationScope: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope"]  # noqa: Y015
     _WhichOneofReturnType__rerunParentInstanceInfo: _TypeAlias = _typing.Literal["rerunParentInstanceInfo"]  # noqa: Y015
     _WhichOneofArgType__rerunParentInstanceInfo: _TypeAlias = _typing.Literal["_rerunParentInstanceInfo", b"_rerunParentInstanceInfo"]  # noqa: Y015
+    _WhichOneofReturnType__retryParentInstanceInfo: _TypeAlias = _typing.Literal["retryParentInstanceInfo"]  # noqa: Y015
+    _WhichOneofArgType__retryParentInstanceInfo: _TypeAlias = _typing.Literal["_retryParentInstanceInfo", b"_retryParentInstanceInfo"]  # noqa: Y015
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__historyPropagationScope) -> _WhichOneofReturnType__historyPropagationScope | None: ...
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__rerunParentInstanceInfo) -> _WhichOneofReturnType__rerunParentInstanceInfo | None: ...
+    @_typing.overload
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__retryParentInstanceInfo) -> _WhichOneofReturnType__retryParentInstanceInfo | None: ...
 
 Global___ChildWorkflowInstanceCreatedEvent: _TypeAlias = ChildWorkflowInstanceCreatedEvent  # noqa: Y015
 
diff --git a/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.py b/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.py
index c5719c1a7..45f573eb9 100644
--- a/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.py
+++ b/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.py
@@ -26,7 +26,7 @@
 from google.protobuf import wrappers_pb2 as google_dot_protobuf_dot_wrappers__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x13orchestration.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"\x83\x01\n\nTaskRouter\x12\x13\n\x0bsourceAppID\x18\x01 \x01(\t\x12\x18\n\x0btargetAppID\x18\x02 \x01(\tH\x00\x88\x01\x01\x12\x1f\n\x12targetAppNamespace\x18\x03 \x01(\tH\x01\x88\x01\x01\x42\x0e\n\x0c_targetAppIDB\x15\n\x13_targetAppNamespace\">\n\x0fWorkflowVersion\x12\x0f\n\x07patches\x18\x01 \x03(\t\x12\x11\n\x04name\x18\x02 \x01(\tH\x00\x88\x01\x01\x42\x07\n\x05_name\"Y\n\x10WorkflowInstance\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x31\n\x0b\x65xecutionId\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\"\xb2\x01\n\x12TaskFailureDetails\x12\x11\n\terrorType\x18\x01 \x01(\t\x12\x14\n\x0c\x65rrorMessage\x18\x02 \x01(\t\x12\x30\n\nstackTrace\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12)\n\x0cinnerFailure\x18\x04 \x01(\x0b\x32\x13.TaskFailureDetails\x12\x16\n\x0eisNonRetriable\x18\x05 \x01(\x08\"\xff\x01\n\x12ParentInstanceInfo\x12\x17\n\x0ftaskScheduledId\x18\x01 \x01(\x05\x12*\n\x04name\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x10workflowInstance\x18\x04 \x01(\x0b\x32\x11.WorkflowInstance\x12\x12\n\x05\x61ppID\x18\x05 \x01(\tH\x00\x88\x01\x01\x12\x19\n\x0c\x61ppNamespace\x18\x06 \x01(\tH\x01\x88\x01\x01\x42\x08\n\x06_appIDB\x0f\n\r_appNamespace\"-\n\x17RerunParentInstanceInfo\x12\x12\n\ninstanceID\x18\x01 \x01(\t\"i\n\x0cTraceContext\x12\x13\n\x0btraceParent\x18\x01 \x01(\t\x12\x12\n\x06spanID\x18\x02 \x01(\tB\x02\x18\x01\x12\x30\n\ntraceState\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\"\xef\x05\n\rWorkflowState\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12,\n\x0eworkflowStatus\x18\x04 \x01(\x0e\x32\x14.OrchestrationStatus\x12;\n\x17scheduledStartTimestamp\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x34\n\x10\x63reatedTimestamp\x18\x06 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x38\n\x14lastUpdatedTimestamp\x18\x07 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12+\n\x05input\x18\x08 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12,\n\x06output\x18\t \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x32\n\x0c\x63ustomStatus\x18\n \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x0e\x66\x61ilureDetails\x18\x0b \x01(\x0b\x32\x13.TaskFailureDetails\x12\x31\n\x0b\x65xecutionId\x18\x0c \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x36\n\x12\x63ompletedTimestamp\x18\r \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x36\n\x10parentInstanceId\x18\x0e \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12&\n\x04tags\x18\x0f \x03(\x0b\x32\x18.WorkflowState.TagsEntry\x1a+\n\tTagsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01*Y\n\rStalledReason\x12\x12\n\x0ePATCH_MISMATCH\x10\x00\x12\x19\n\x15VERSION_NOT_AVAILABLE\x10\x01\x12\x19\n\x15PAYLOAD_SIZE_EXCEEDED\x10\x02*\xd7\x02\n\x13OrchestrationStatus\x12 \n\x1cORCHESTRATION_STATUS_RUNNING\x10\x00\x12\"\n\x1eORCHESTRATION_STATUS_COMPLETED\x10\x01\x12)\n%ORCHESTRATION_STATUS_CONTINUED_AS_NEW\x10\x02\x12\x1f\n\x1bORCHESTRATION_STATUS_FAILED\x10\x03\x12!\n\x1dORCHESTRATION_STATUS_CANCELED\x10\x04\x12#\n\x1fORCHESTRATION_STATUS_TERMINATED\x10\x05\x12 \n\x1cORCHESTRATION_STATUS_PENDING\x10\x06\x12\"\n\x1eORCHESTRATION_STATUS_SUSPENDED\x10\x07\x12 \n\x1cORCHESTRATION_STATUS_STALLED\x10\x08*\x8f\x01\n\x17HistoryPropagationScope\x12\"\n\x1eHISTORY_PROPAGATION_SCOPE_NONE\x10\x00\x12)\n%HISTORY_PROPAGATION_SCOPE_OWN_HISTORY\x10\x01\x12%\n!HISTORY_PROPAGATION_SCOPE_LINEAGE\x10\x02\x42V\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x13orchestration.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"\x83\x01\n\nTaskRouter\x12\x13\n\x0bsourceAppID\x18\x01 \x01(\t\x12\x18\n\x0btargetAppID\x18\x02 \x01(\tH\x00\x88\x01\x01\x12\x1f\n\x12targetAppNamespace\x18\x03 \x01(\tH\x01\x88\x01\x01\x42\x0e\n\x0c_targetAppIDB\x15\n\x13_targetAppNamespace\">\n\x0fWorkflowVersion\x12\x0f\n\x07patches\x18\x01 \x03(\t\x12\x11\n\x04name\x18\x02 \x01(\tH\x00\x88\x01\x01\x42\x07\n\x05_name\"Y\n\x10WorkflowInstance\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x31\n\x0b\x65xecutionId\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\"\xb2\x01\n\x12TaskFailureDetails\x12\x11\n\terrorType\x18\x01 \x01(\t\x12\x14\n\x0c\x65rrorMessage\x18\x02 \x01(\t\x12\x30\n\nstackTrace\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12)\n\x0cinnerFailure\x18\x04 \x01(\x0b\x32\x13.TaskFailureDetails\x12\x16\n\x0eisNonRetriable\x18\x05 \x01(\x08\"\xff\x01\n\x12ParentInstanceInfo\x12\x17\n\x0ftaskScheduledId\x18\x01 \x01(\x05\x12*\n\x04name\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x10workflowInstance\x18\x04 \x01(\x0b\x32\x11.WorkflowInstance\x12\x12\n\x05\x61ppID\x18\x05 \x01(\tH\x00\x88\x01\x01\x12\x19\n\x0c\x61ppNamespace\x18\x06 \x01(\tH\x01\x88\x01\x01\x42\x08\n\x06_appIDB\x0f\n\r_appNamespace\"-\n\x17RerunParentInstanceInfo\x12\x12\n\ninstanceID\x18\x01 \x01(\t\"-\n\x17RetryParentInstanceInfo\x12\x12\n\ninstanceID\x18\x01 \x01(\t\"i\n\x0cTraceContext\x12\x13\n\x0btraceParent\x18\x01 \x01(\t\x12\x12\n\x06spanID\x18\x02 \x01(\tB\x02\x18\x01\x12\x30\n\ntraceState\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\"\xe4\x06\n\rWorkflowState\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12,\n\x0eworkflowStatus\x18\x04 \x01(\x0e\x32\x14.OrchestrationStatus\x12;\n\x17scheduledStartTimestamp\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x34\n\x10\x63reatedTimestamp\x18\x06 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x38\n\x14lastUpdatedTimestamp\x18\x07 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12+\n\x05input\x18\x08 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12,\n\x06output\x18\t \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x32\n\x0c\x63ustomStatus\x18\n \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x0e\x66\x61ilureDetails\x18\x0b \x01(\x0b\x32\x13.TaskFailureDetails\x12\x31\n\x0b\x65xecutionId\x18\x0c \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x36\n\x12\x63ompletedTimestamp\x18\r \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x36\n\x10parentInstanceId\x18\x0e \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12&\n\x04tags\x18\x0f \x03(\x0b\x32\x18.WorkflowState.TagsEntry\x12\x31\n\x0bparentAppId\x18\x10 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x32\n\tstartedAt\x18\x11 \x01(\x0b\x32\x1a.google.protobuf.TimestampH\x00\x88\x01\x01\x1a+\n\tTagsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x42\x0c\n\n_startedAt*Y\n\rStalledReason\x12\x12\n\x0ePATCH_MISMATCH\x10\x00\x12\x19\n\x15VERSION_NOT_AVAILABLE\x10\x01\x12\x19\n\x15PAYLOAD_SIZE_EXCEEDED\x10\x02*\xd7\x02\n\x13OrchestrationStatus\x12 \n\x1cORCHESTRATION_STATUS_RUNNING\x10\x00\x12\"\n\x1eORCHESTRATION_STATUS_COMPLETED\x10\x01\x12)\n%ORCHESTRATION_STATUS_CONTINUED_AS_NEW\x10\x02\x12\x1f\n\x1bORCHESTRATION_STATUS_FAILED\x10\x03\x12!\n\x1dORCHESTRATION_STATUS_CANCELED\x10\x04\x12#\n\x1fORCHESTRATION_STATUS_TERMINATED\x10\x05\x12 \n\x1cORCHESTRATION_STATUS_PENDING\x10\x06\x12\"\n\x1eORCHESTRATION_STATUS_SUSPENDED\x10\x07\x12 \n\x1cORCHESTRATION_STATUS_STALLED\x10\x08*\x8f\x01\n\x17HistoryPropagationScope\x12\"\n\x1eHISTORY_PROPAGATION_SCOPE_NONE\x10\x00\x12)\n%HISTORY_PROPAGATION_SCOPE_OWN_HISTORY\x10\x01\x12%\n!HISTORY_PROPAGATION_SCOPE_LINEAGE\x10\x02\x42V\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -38,12 +38,12 @@
   _globals['_TRACECONTEXT'].fields_by_name['spanID']._serialized_options = b'\030\001'
   _globals['_WORKFLOWSTATE_TAGSENTRY']._loaded_options = None
   _globals['_WORKFLOWSTATE_TAGSENTRY']._serialized_options = b'8\001'
-  _globals['_STALLEDREASON']._serialized_start=1724
-  _globals['_STALLEDREASON']._serialized_end=1813
-  _globals['_ORCHESTRATIONSTATUS']._serialized_start=1816
-  _globals['_ORCHESTRATIONSTATUS']._serialized_end=2159
-  _globals['_HISTORYPROPAGATIONSCOPE']._serialized_start=2162
-  _globals['_HISTORYPROPAGATIONSCOPE']._serialized_end=2305
+  _globals['_STALLEDREASON']._serialized_start=1888
+  _globals['_STALLEDREASON']._serialized_end=1977
+  _globals['_ORCHESTRATIONSTATUS']._serialized_start=1980
+  _globals['_ORCHESTRATIONSTATUS']._serialized_end=2323
+  _globals['_HISTORYPROPAGATIONSCOPE']._serialized_start=2326
+  _globals['_HISTORYPROPAGATIONSCOPE']._serialized_end=2469
   _globals['_TASKROUTER']._serialized_start=89
   _globals['_TASKROUTER']._serialized_end=220
   _globals['_WORKFLOWVERSION']._serialized_start=222
@@ -56,10 +56,12 @@
   _globals['_PARENTINSTANCEINFO']._serialized_end=814
   _globals['_RERUNPARENTINSTANCEINFO']._serialized_start=816
   _globals['_RERUNPARENTINSTANCEINFO']._serialized_end=861
-  _globals['_TRACECONTEXT']._serialized_start=863
-  _globals['_TRACECONTEXT']._serialized_end=968
-  _globals['_WORKFLOWSTATE']._serialized_start=971
-  _globals['_WORKFLOWSTATE']._serialized_end=1722
-  _globals['_WORKFLOWSTATE_TAGSENTRY']._serialized_start=1679
-  _globals['_WORKFLOWSTATE_TAGSENTRY']._serialized_end=1722
+  _globals['_RETRYPARENTINSTANCEINFO']._serialized_start=863
+  _globals['_RETRYPARENTINSTANCEINFO']._serialized_end=908
+  _globals['_TRACECONTEXT']._serialized_start=910
+  _globals['_TRACECONTEXT']._serialized_end=1015
+  _globals['_WORKFLOWSTATE']._serialized_start=1018
+  _globals['_WORKFLOWSTATE']._serialized_end=1886
+  _globals['_WORKFLOWSTATE_TAGSENTRY']._serialized_start=1829
+  _globals['_WORKFLOWSTATE_TAGSENTRY']._serialized_end=1872
 # @@protoc_insertion_point(module_scope)
diff --git a/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.pyi b/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.pyi
index 10b22698f..8e2cbb88c 100644
--- a/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.pyi
+++ b/dapr/ext/workflow/_durabletask/internal/orchestration_pb2.pyi
@@ -294,6 +294,39 @@ class RerunParentInstanceInfo(_message.Message):
 
 Global___RerunParentInstanceInfo: _TypeAlias = RerunParentInstanceInfo  # noqa: Y015
 
+@_typing.final
+class RetryParentInstanceInfo(_message.Message):
+    """RetryParentInstanceInfo correlates a child-workflow retry attempt with the
+    initial attempt that spawned it. When a child workflow is scheduled with a
+    retry policy, each retry executes as a separate child workflow instance with
+    its own auto-generated instance ID. This message provides an explicit,
+    first-class link back to the first attempt so consumers no longer need to
+    reconstruct the relationship from event ordering and timer origins.
+
+    Semantics: the first attempt carries no RetryParentInstanceInfo. Retry
+    attempts (2nd onward) carry RetryParentInstanceInfo with instanceID set to
+    the first attempt's instance ID. Consumers group attempts by reading the
+    parent workflow's history; the group key is retryParentInstanceInfo.instanceID
+    when present, otherwise the event's own instanceId.
+    """
+
+    DESCRIPTOR: _descriptor.Descriptor
+
+    INSTANCEID_FIELD_NUMBER: _builtins.int
+    instanceID: _builtins.str
+    """instanceID is the instance ID of the first attempt in this child-workflow
+    retry chain.
+    """
+    def __init__(
+        self,
+        *,
+        instanceID: _builtins.str = ...,
+    ) -> None: ...
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["instanceID", b"instanceID"]  # noqa: Y015
+    def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+
+Global___RetryParentInstanceInfo: _TypeAlias = RetryParentInstanceInfo  # noqa: Y015
+
 @_typing.final
 class TraceContext(_message.Message):
     DESCRIPTOR: _descriptor.Descriptor
@@ -360,6 +393,8 @@ class WorkflowState(_message.Message):
     COMPLETEDTIMESTAMP_FIELD_NUMBER: _builtins.int
     PARENTINSTANCEID_FIELD_NUMBER: _builtins.int
     TAGS_FIELD_NUMBER: _builtins.int
+    PARENTAPPID_FIELD_NUMBER: _builtins.int
+    STARTEDAT_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     name: _builtins.str
     workflowStatus: Global___OrchestrationStatus.ValueType
@@ -387,6 +422,10 @@ class WorkflowState(_message.Message):
     def parentInstanceId(self) -> _wrappers_pb2.StringValue: ...
     @_builtins.property
     def tags(self) -> _containers.ScalarMap[_builtins.str, _builtins.str]: ...
+    @_builtins.property
+    def parentAppId(self) -> _wrappers_pb2.StringValue: ...
+    @_builtins.property
+    def startedAt(self) -> _timestamp_pb2.Timestamp: ...
     def __init__(
         self,
         *,
@@ -405,10 +444,15 @@ class WorkflowState(_message.Message):
         completedTimestamp: _timestamp_pb2.Timestamp | None = ...,
         parentInstanceId: _wrappers_pb2.StringValue | None = ...,
         tags: _abc.Mapping[_builtins.str, _builtins.str] | None = ...,
+        parentAppId: _wrappers_pb2.StringValue | None = ...,
+        startedAt: _timestamp_pb2.Timestamp | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["completedTimestamp", b"completedTimestamp", "createdTimestamp", b"createdTimestamp", "customStatus", b"customStatus", "executionId", b"executionId", "failureDetails", b"failureDetails", "input", b"input", "lastUpdatedTimestamp", b"lastUpdatedTimestamp", "output", b"output", "parentInstanceId", b"parentInstanceId", "scheduledStartTimestamp", b"scheduledStartTimestamp", "version", b"version"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_startedAt", b"_startedAt", "completedTimestamp", b"completedTimestamp", "createdTimestamp", b"createdTimestamp", "customStatus", b"customStatus", "executionId", b"executionId", "failureDetails", b"failureDetails", "input", b"input", "lastUpdatedTimestamp", b"lastUpdatedTimestamp", "output", b"output", "parentAppId", b"parentAppId", "parentInstanceId", b"parentInstanceId", "scheduledStartTimestamp", b"scheduledStartTimestamp", "startedAt", b"startedAt", "version", b"version"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["completedTimestamp", b"completedTimestamp", "createdTimestamp", b"createdTimestamp", "customStatus", b"customStatus", "executionId", b"executionId", "failureDetails", b"failureDetails", "input", b"input", "instanceId", b"instanceId", "lastUpdatedTimestamp", b"lastUpdatedTimestamp", "name", b"name", "output", b"output", "parentInstanceId", b"parentInstanceId", "scheduledStartTimestamp", b"scheduledStartTimestamp", "tags", b"tags", "version", b"version", "workflowStatus", b"workflowStatus"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_startedAt", b"_startedAt", "completedTimestamp", b"completedTimestamp", "createdTimestamp", b"createdTimestamp", "customStatus", b"customStatus", "executionId", b"executionId", "failureDetails", b"failureDetails", "input", b"input", "instanceId", b"instanceId", "lastUpdatedTimestamp", b"lastUpdatedTimestamp", "name", b"name", "output", b"output", "parentAppId", b"parentAppId", "parentInstanceId", b"parentInstanceId", "scheduledStartTimestamp", b"scheduledStartTimestamp", "startedAt", b"startedAt", "tags", b"tags", "version", b"version", "workflowStatus", b"workflowStatus"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__startedAt: _TypeAlias = _typing.Literal["startedAt"]  # noqa: Y015
+    _WhichOneofArgType__startedAt: _TypeAlias = _typing.Literal["_startedAt", b"_startedAt"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__startedAt) -> _WhichOneofReturnType__startedAt | None: ...
 
 Global___WorkflowState: _TypeAlias = WorkflowState  # noqa: Y015
diff --git a/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.py b/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.py
index 9af283e56..503b5773e 100644
--- a/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.py
+++ b/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.py
@@ -28,7 +28,7 @@
 from google.protobuf import wrappers_pb2 as google_dot_protobuf_dot_wrappers__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1aorchestrator_actions.proto\x1a\x13orchestration.proto\x1a\x14history_events.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"\xa0\x02\n\x12ScheduleTaskAction\x12\x0c\n\x04name\x18\x01 \x01(\t\x12-\n\x07version\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12 \n\x06router\x18\x04 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x12\x17\n\x0ftaskExecutionId\x18\x05 \x01(\t\x12>\n\x17historyPropagationScope\x18\x06 \x01(\x0e\x32\x18.HistoryPropagationScopeH\x01\x88\x01\x01\x42\t\n\x07_routerB\x1a\n\x18_historyPropagationScope\"\xa2\x02\n\x19\x43reateChildWorkflowAction\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12 \n\x06router\x18\x05 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x12>\n\x17historyPropagationScope\x18\x06 \x01(\x0e\x32\x18.HistoryPropagationScopeH\x01\x88\x01\x01\x42\t\n\x07_routerB\x1a\n\x18_historyPropagationScope\"\x85\x04\n\x1c\x43reateDetachedWorkflowAction\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12@\n\x17scheduledStartTimestamp\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.TimestampH\x00\x88\x01\x01\x12\x31\n\x0b\x65xecutionId\x18\x06 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x35\n\x04tags\x18\x07 \x03(\x0b\x32\'.CreateDetachedWorkflowAction.TagsEntry\x12.\n\x12parentTraceContext\x18\x08 \x01(\x0b\x32\r.TraceContextH\x01\x88\x01\x01\x12 \n\x06router\x18\t \x01(\x0b\x32\x0b.TaskRouterH\x02\x88\x01\x01\x1a+\n\tTagsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x42\x1a\n\x18_scheduledStartTimestampB\x15\n\x13_parentTraceContextB\t\n\x07_router\"\xbb\x02\n\x11\x43reateTimerAction\x12*\n\x06\x66ireAt\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x11\n\x04name\x18\x02 \x01(\tH\x01\x88\x01\x01\x12.\n\x0b\x63reateTimer\x18\x03 \x01(\x0b\x32\x17.TimerOriginCreateTimerH\x00\x12\x32\n\rexternalEvent\x18\x04 \x01(\x0b\x32\x19.TimerOriginExternalEventH\x00\x12\x32\n\ractivityRetry\x18\x05 \x01(\x0b\x32\x19.TimerOriginActivityRetryH\x00\x12<\n\x12\x63hildWorkflowRetry\x18\x06 \x01(\x0b\x32\x1e.TimerOriginChildWorkflowRetryH\x00\x42\x08\n\x06originB\x07\n\x05_name\"p\n\x0fSendEventAction\x12#\n\x08instance\x18\x01 \x01(\x0b\x32\x11.WorkflowInstance\x12\x0c\n\x04name\x18\x02 \x01(\t\x12*\n\x04\x64\x61ta\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\"\xaa\x02\n\x16\x43ompleteWorkflowAction\x12,\n\x0eworkflowStatus\x18\x01 \x01(\x0e\x32\x14.OrchestrationStatus\x12,\n\x06result\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12-\n\x07\x64\x65tails\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x30\n\nnewVersion\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12&\n\x0f\x63\x61rryoverEvents\x18\x05 \x03(\x0b\x32\r.HistoryEvent\x12+\n\x0e\x66\x61ilureDetails\x18\x06 \x01(\x0b\x32\x13.TaskFailureDetails\"l\n\x17TerminateWorkflowAction\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12,\n\x06reason\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x0f\n\x07recurse\x18\x03 \x01(\x08\"#\n!WorkflowVersionNotAvailableAction\"\x97\x04\n\x0eWorkflowAction\x12\n\n\x02id\x18\x01 \x01(\x05\x12+\n\x0cscheduleTask\x18\x02 \x01(\x0b\x32\x13.ScheduleTaskActionH\x00\x12\x39\n\x13\x63reateChildWorkflow\x18\x03 \x01(\x0b\x32\x1a.CreateChildWorkflowActionH\x00\x12)\n\x0b\x63reateTimer\x18\x04 \x01(\x0b\x32\x12.CreateTimerActionH\x00\x12%\n\tsendEvent\x18\x05 \x01(\x0b\x32\x10.SendEventActionH\x00\x12\x33\n\x10\x63ompleteWorkflow\x18\x06 \x01(\x0b\x32\x17.CompleteWorkflowActionH\x00\x12\x35\n\x11terminateWorkflow\x18\x07 \x01(\x0b\x32\x18.TerminateWorkflowActionH\x00\x12I\n\x1bworkflowVersionNotAvailable\x18\n \x01(\x0b\x32\".WorkflowVersionNotAvailableActionH\x00\x12?\n\x16\x63reateDetachedWorkflow\x18\x0b \x01(\x0b\x32\x1d.CreateDetachedWorkflowActionH\x00\x12 \n\x06router\x18\t \x01(\x0b\x32\x0b.TaskRouterH\x01\x88\x01\x01\x42\x14\n\x12workflowActionTypeB\t\n\x07_routerJ\x04\x08\x08\x10\tBV\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1aorchestrator_actions.proto\x1a\x13orchestration.proto\x1a\x14history_events.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\"\xf9\x01\n\x12ScheduleTaskAction\x12\x0c\n\x04name\x18\x01 \x01(\t\x12-\n\x07version\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x17\n\x0ftaskExecutionId\x18\x05 \x01(\t\x12>\n\x17historyPropagationScope\x18\x06 \x01(\x0e\x32\x18.HistoryPropagationScopeH\x00\x88\x01\x01\x42\x1a\n\x18_historyPropagationScopeJ\x04\x08\x04\x10\x05\"\xd7\x02\n\x19\x43reateChildWorkflowAction\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12>\n\x17historyPropagationScope\x18\x06 \x01(\x0e\x32\x18.HistoryPropagationScopeH\x00\x88\x01\x01\x12>\n\x17retryParentInstanceInfo\x18\x07 \x01(\x0b\x32\x18.RetryParentInstanceInfoH\x01\x88\x01\x01\x42\x1a\n\x18_historyPropagationScopeB\x1a\n\x18_retryParentInstanceInfoJ\x04\x08\x05\x10\x06\"\xde\x03\n\x1c\x43reateDetachedWorkflowAction\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12-\n\x07version\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12@\n\x17scheduledStartTimestamp\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.TimestampH\x00\x88\x01\x01\x12\x31\n\x0b\x65xecutionId\x18\x06 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x35\n\x04tags\x18\x07 \x03(\x0b\x32\'.CreateDetachedWorkflowAction.TagsEntry\x12.\n\x12parentTraceContext\x18\x08 \x01(\x0b\x32\r.TraceContextH\x01\x88\x01\x01\x1a+\n\tTagsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x42\x1a\n\x18_scheduledStartTimestampB\x15\n\x13_parentTraceContextJ\x04\x08\t\x10\n\"\xbb\x02\n\x11\x43reateTimerAction\x12*\n\x06\x66ireAt\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x11\n\x04name\x18\x02 \x01(\tH\x01\x88\x01\x01\x12.\n\x0b\x63reateTimer\x18\x03 \x01(\x0b\x32\x17.TimerOriginCreateTimerH\x00\x12\x32\n\rexternalEvent\x18\x04 \x01(\x0b\x32\x19.TimerOriginExternalEventH\x00\x12\x32\n\ractivityRetry\x18\x05 \x01(\x0b\x32\x19.TimerOriginActivityRetryH\x00\x12<\n\x12\x63hildWorkflowRetry\x18\x06 \x01(\x0b\x32\x1e.TimerOriginChildWorkflowRetryH\x00\x42\x08\n\x06originB\x07\n\x05_name\"p\n\x0fSendEventAction\x12#\n\x08instance\x18\x01 \x01(\x0b\x32\x11.WorkflowInstance\x12\x0c\n\x04name\x18\x02 \x01(\t\x12*\n\x04\x64\x61ta\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\"\xaa\x02\n\x16\x43ompleteWorkflowAction\x12,\n\x0eworkflowStatus\x18\x01 \x01(\x0e\x32\x14.OrchestrationStatus\x12,\n\x06result\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12-\n\x07\x64\x65tails\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x30\n\nnewVersion\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12&\n\x0f\x63\x61rryoverEvents\x18\x05 \x03(\x0b\x32\r.HistoryEvent\x12+\n\x0e\x66\x61ilureDetails\x18\x06 \x01(\x0b\x32\x13.TaskFailureDetails\"l\n\x17TerminateWorkflowAction\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12,\n\x06reason\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x0f\n\x07recurse\x18\x03 \x01(\x08\"#\n!WorkflowVersionNotAvailableAction\"\x97\x04\n\x0eWorkflowAction\x12\n\n\x02id\x18\x01 \x01(\x05\x12+\n\x0cscheduleTask\x18\x02 \x01(\x0b\x32\x13.ScheduleTaskActionH\x00\x12\x39\n\x13\x63reateChildWorkflow\x18\x03 \x01(\x0b\x32\x1a.CreateChildWorkflowActionH\x00\x12)\n\x0b\x63reateTimer\x18\x04 \x01(\x0b\x32\x12.CreateTimerActionH\x00\x12%\n\tsendEvent\x18\x05 \x01(\x0b\x32\x10.SendEventActionH\x00\x12\x33\n\x10\x63ompleteWorkflow\x18\x06 \x01(\x0b\x32\x17.CompleteWorkflowActionH\x00\x12\x35\n\x11terminateWorkflow\x18\x07 \x01(\x0b\x32\x18.TerminateWorkflowActionH\x00\x12I\n\x1bworkflowVersionNotAvailable\x18\n \x01(\x0b\x32\".WorkflowVersionNotAvailableActionH\x00\x12?\n\x16\x63reateDetachedWorkflow\x18\x0b \x01(\x0b\x32\x1d.CreateDetachedWorkflowActionH\x00\x12 \n\x06router\x18\t \x01(\x0b\x32\x0b.TaskRouterH\x01\x88\x01\x01\x42\x14\n\x12workflowActionTypeB\t\n\x07_routerJ\x04\x08\x08\x10\tBV\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -39,23 +39,23 @@
   _globals['_CREATEDETACHEDWORKFLOWACTION_TAGSENTRY']._loaded_options = None
   _globals['_CREATEDETACHEDWORKFLOWACTION_TAGSENTRY']._serialized_options = b'8\001'
   _globals['_SCHEDULETASKACTION']._serialized_start=139
-  _globals['_SCHEDULETASKACTION']._serialized_end=427
-  _globals['_CREATECHILDWORKFLOWACTION']._serialized_start=430
-  _globals['_CREATECHILDWORKFLOWACTION']._serialized_end=720
-  _globals['_CREATEDETACHEDWORKFLOWACTION']._serialized_start=723
-  _globals['_CREATEDETACHEDWORKFLOWACTION']._serialized_end=1240
-  _globals['_CREATEDETACHEDWORKFLOWACTION_TAGSENTRY']._serialized_start=1135
-  _globals['_CREATEDETACHEDWORKFLOWACTION_TAGSENTRY']._serialized_end=1178
-  _globals['_CREATETIMERACTION']._serialized_start=1243
-  _globals['_CREATETIMERACTION']._serialized_end=1558
-  _globals['_SENDEVENTACTION']._serialized_start=1560
-  _globals['_SENDEVENTACTION']._serialized_end=1672
-  _globals['_COMPLETEWORKFLOWACTION']._serialized_start=1675
-  _globals['_COMPLETEWORKFLOWACTION']._serialized_end=1973
-  _globals['_TERMINATEWORKFLOWACTION']._serialized_start=1975
-  _globals['_TERMINATEWORKFLOWACTION']._serialized_end=2083
-  _globals['_WORKFLOWVERSIONNOTAVAILABLEACTION']._serialized_start=2085
-  _globals['_WORKFLOWVERSIONNOTAVAILABLEACTION']._serialized_end=2120
-  _globals['_WORKFLOWACTION']._serialized_start=2123
-  _globals['_WORKFLOWACTION']._serialized_end=2658
+  _globals['_SCHEDULETASKACTION']._serialized_end=388
+  _globals['_CREATECHILDWORKFLOWACTION']._serialized_start=391
+  _globals['_CREATECHILDWORKFLOWACTION']._serialized_end=734
+  _globals['_CREATEDETACHEDWORKFLOWACTION']._serialized_start=737
+  _globals['_CREATEDETACHEDWORKFLOWACTION']._serialized_end=1215
+  _globals['_CREATEDETACHEDWORKFLOWACTION_TAGSENTRY']._serialized_start=1115
+  _globals['_CREATEDETACHEDWORKFLOWACTION_TAGSENTRY']._serialized_end=1158
+  _globals['_CREATETIMERACTION']._serialized_start=1218
+  _globals['_CREATETIMERACTION']._serialized_end=1533
+  _globals['_SENDEVENTACTION']._serialized_start=1535
+  _globals['_SENDEVENTACTION']._serialized_end=1647
+  _globals['_COMPLETEWORKFLOWACTION']._serialized_start=1650
+  _globals['_COMPLETEWORKFLOWACTION']._serialized_end=1948
+  _globals['_TERMINATEWORKFLOWACTION']._serialized_start=1950
+  _globals['_TERMINATEWORKFLOWACTION']._serialized_end=2058
+  _globals['_WORKFLOWVERSIONNOTAVAILABLEACTION']._serialized_start=2060
+  _globals['_WORKFLOWVERSIONNOTAVAILABLEACTION']._serialized_end=2095
+  _globals['_WORKFLOWACTION']._serialized_start=2098
+  _globals['_WORKFLOWACTION']._serialized_end=2633
 # @@protoc_insertion_point(module_scope)
diff --git a/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.pyi b/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.pyi
index 1934c960f..9e4e3deb0 100644
--- a/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.pyi
+++ b/dapr/ext/workflow/_durabletask/internal/orchestrator_actions_pb2.pyi
@@ -31,7 +31,6 @@ class ScheduleTaskAction(_message.Message):
     NAME_FIELD_NUMBER: _builtins.int
     VERSION_FIELD_NUMBER: _builtins.int
     INPUT_FIELD_NUMBER: _builtins.int
-    ROUTER_FIELD_NUMBER: _builtins.int
     TASKEXECUTIONID_FIELD_NUMBER: _builtins.int
     HISTORYPROPAGATIONSCOPE_FIELD_NUMBER: _builtins.int
     name: _builtins.str
@@ -42,30 +41,22 @@ class ScheduleTaskAction(_message.Message):
     def version(self) -> _wrappers_pb2.StringValue: ...
     @_builtins.property
     def input(self) -> _wrappers_pb2.StringValue: ...
-    @_builtins.property
-    def router(self) -> _orchestration_pb2.TaskRouter: ...
     def __init__(
         self,
         *,
         name: _builtins.str = ...,
         version: _wrappers_pb2.StringValue | None = ...,
         input: _wrappers_pb2.StringValue | None = ...,
-        router: _orchestration_pb2.TaskRouter | None = ...,
         taskExecutionId: _builtins.str = ...,
         historyPropagationScope: _orchestration_pb2.HistoryPropagationScope.ValueType | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_router", b"_router", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "router", b"router", "version", b"version"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "version", b"version"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_router", b"_router", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "name", b"name", "router", b"router", "taskExecutionId", b"taskExecutionId", "version", b"version"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "name", b"name", "taskExecutionId", b"taskExecutionId", "version", b"version"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__historyPropagationScope: _TypeAlias = _typing.Literal["historyPropagationScope"]  # noqa: Y015
     _WhichOneofArgType__historyPropagationScope: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope"]  # noqa: Y015
-    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
-    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
-    @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__historyPropagationScope) -> _WhichOneofReturnType__historyPropagationScope | None: ...
-    @_typing.overload
-    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___ScheduleTaskAction: _TypeAlias = ScheduleTaskAction  # noqa: Y015
 
@@ -77,8 +68,8 @@ class CreateChildWorkflowAction(_message.Message):
     NAME_FIELD_NUMBER: _builtins.int
     VERSION_FIELD_NUMBER: _builtins.int
     INPUT_FIELD_NUMBER: _builtins.int
-    ROUTER_FIELD_NUMBER: _builtins.int
     HISTORYPROPAGATIONSCOPE_FIELD_NUMBER: _builtins.int
+    RETRYPARENTINSTANCEINFO_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     name: _builtins.str
     historyPropagationScope: _orchestration_pb2.HistoryPropagationScope.ValueType
@@ -88,7 +79,15 @@ class CreateChildWorkflowAction(_message.Message):
     @_builtins.property
     def input(self) -> _wrappers_pb2.StringValue: ...
     @_builtins.property
-    def router(self) -> _orchestration_pb2.TaskRouter: ...
+    def retryParentInstanceInfo(self) -> _orchestration_pb2.RetryParentInstanceInfo:
+        """If defined, indicates that this child workflow is a retry attempt and
+        links it back to the first attempt in the retry chain. Absent on the
+        first attempt. The runtime persists this onto the resulting
+        ChildWorkflowInstanceCreatedEvent so consumers can correlate retry
+        attempts by grouping on retryParentInstanceInfo.instanceID when present,
+        otherwise on the created instance's own instanceId.
+        """
+
     def __init__(
         self,
         *,
@@ -96,21 +95,21 @@ class CreateChildWorkflowAction(_message.Message):
         name: _builtins.str = ...,
         version: _wrappers_pb2.StringValue | None = ...,
         input: _wrappers_pb2.StringValue | None = ...,
-        router: _orchestration_pb2.TaskRouter | None = ...,
         historyPropagationScope: _orchestration_pb2.HistoryPropagationScope.ValueType | None = ...,
+        retryParentInstanceInfo: _orchestration_pb2.RetryParentInstanceInfo | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_router", b"_router", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "router", b"router", "version", b"version"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_retryParentInstanceInfo", b"_retryParentInstanceInfo", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "retryParentInstanceInfo", b"retryParentInstanceInfo", "version", b"version"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_router", b"_router", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "instanceId", b"instanceId", "name", b"name", "router", b"router", "version", b"version"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope", "_retryParentInstanceInfo", b"_retryParentInstanceInfo", "historyPropagationScope", b"historyPropagationScope", "input", b"input", "instanceId", b"instanceId", "name", b"name", "retryParentInstanceInfo", b"retryParentInstanceInfo", "version", b"version"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__historyPropagationScope: _TypeAlias = _typing.Literal["historyPropagationScope"]  # noqa: Y015
     _WhichOneofArgType__historyPropagationScope: _TypeAlias = _typing.Literal["_historyPropagationScope", b"_historyPropagationScope"]  # noqa: Y015
-    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
-    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    _WhichOneofReturnType__retryParentInstanceInfo: _TypeAlias = _typing.Literal["retryParentInstanceInfo"]  # noqa: Y015
+    _WhichOneofArgType__retryParentInstanceInfo: _TypeAlias = _typing.Literal["_retryParentInstanceInfo", b"_retryParentInstanceInfo"]  # noqa: Y015
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__historyPropagationScope) -> _WhichOneofReturnType__historyPropagationScope | None: ...
     @_typing.overload
-    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__retryParentInstanceInfo) -> _WhichOneofReturnType__retryParentInstanceInfo | None: ...
 
 Global___CreateChildWorkflowAction: _TypeAlias = CreateChildWorkflowAction  # noqa: Y015
 
@@ -153,7 +152,6 @@ class CreateDetachedWorkflowAction(_message.Message):
     EXECUTIONID_FIELD_NUMBER: _builtins.int
     TAGS_FIELD_NUMBER: _builtins.int
     PARENTTRACECONTEXT_FIELD_NUMBER: _builtins.int
-    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     """instanceId is the ID assigned to the new workflow. It is mandatory:
     implementors must set a stable, deterministic ID so that on replay the
@@ -179,8 +177,6 @@ class CreateDetachedWorkflowAction(_message.Message):
     def tags(self) -> _containers.ScalarMap[_builtins.str, _builtins.str]: ...
     @_builtins.property
     def parentTraceContext(self) -> _orchestration_pb2.TraceContext: ...
-    @_builtins.property
-    def router(self) -> _orchestration_pb2.TaskRouter: ...
     def __init__(
         self,
         *,
@@ -192,23 +188,18 @@ class CreateDetachedWorkflowAction(_message.Message):
         executionId: _wrappers_pb2.StringValue | None = ...,
         tags: _abc.Mapping[_builtins.str, _builtins.str] | None = ...,
         parentTraceContext: _orchestration_pb2.TraceContext | None = ...,
-        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["_parentTraceContext", b"_parentTraceContext", "_router", b"_router", "_scheduledStartTimestamp", b"_scheduledStartTimestamp", "executionId", b"executionId", "input", b"input", "parentTraceContext", b"parentTraceContext", "router", b"router", "scheduledStartTimestamp", b"scheduledStartTimestamp", "version", b"version"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_parentTraceContext", b"_parentTraceContext", "_scheduledStartTimestamp", b"_scheduledStartTimestamp", "executionId", b"executionId", "input", b"input", "parentTraceContext", b"parentTraceContext", "scheduledStartTimestamp", b"scheduledStartTimestamp", "version", b"version"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_parentTraceContext", b"_parentTraceContext", "_router", b"_router", "_scheduledStartTimestamp", b"_scheduledStartTimestamp", "executionId", b"executionId", "input", b"input", "instanceId", b"instanceId", "name", b"name", "parentTraceContext", b"parentTraceContext", "router", b"router", "scheduledStartTimestamp", b"scheduledStartTimestamp", "tags", b"tags", "version", b"version"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_parentTraceContext", b"_parentTraceContext", "_scheduledStartTimestamp", b"_scheduledStartTimestamp", "executionId", b"executionId", "input", b"input", "instanceId", b"instanceId", "name", b"name", "parentTraceContext", b"parentTraceContext", "scheduledStartTimestamp", b"scheduledStartTimestamp", "tags", b"tags", "version", b"version"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__parentTraceContext: _TypeAlias = _typing.Literal["parentTraceContext"]  # noqa: Y015
     _WhichOneofArgType__parentTraceContext: _TypeAlias = _typing.Literal["_parentTraceContext", b"_parentTraceContext"]  # noqa: Y015
-    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
-    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
     _WhichOneofReturnType__scheduledStartTimestamp: _TypeAlias = _typing.Literal["scheduledStartTimestamp"]  # noqa: Y015
     _WhichOneofArgType__scheduledStartTimestamp: _TypeAlias = _typing.Literal["_scheduledStartTimestamp", b"_scheduledStartTimestamp"]  # noqa: Y015
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__parentTraceContext) -> _WhichOneofReturnType__parentTraceContext | None: ...
     @_typing.overload
-    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
-    @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__scheduledStartTimestamp) -> _WhichOneofReturnType__scheduledStartTimestamp | None: ...
 
 Global___CreateDetachedWorkflowAction: _TypeAlias = CreateDetachedWorkflowAction  # noqa: Y015
diff --git a/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.py b/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.py
index 443535186..80f69c149 100644
--- a/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.py
+++ b/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.py
@@ -30,7 +30,7 @@
 from google.protobuf import empty_pb2 as google_dot_protobuf_dot_empty__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1aorchestrator_service.proto\x1a\x13orchestration.proto\x1a\x14history_events.proto\x1a\x1aorchestrator_actions.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\x1a\x1bgoogle/protobuf/empty.proto\"\xc6\x02\n\x0f\x41\x63tivityRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12-\n\x07version\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x10workflowInstance\x18\x04 \x01(\x0b\x32\x11.WorkflowInstance\x12\x0e\n\x06taskId\x18\x05 \x01(\x05\x12)\n\x12parentTraceContext\x18\x06 \x01(\x0b\x32\r.TraceContext\x12\x17\n\x0ftaskExecutionId\x18\x07 \x01(\t\x12\x32\n\x11propagatedHistory\x18\x08 \x01(\x0b\x32\x12.PropagatedHistoryH\x00\x88\x01\x01\x42\x14\n\x12_propagatedHistory\"\xaa\x01\n\x10\x41\x63tivityResponse\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0e\n\x06taskId\x18\x02 \x01(\x05\x12,\n\x06result\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x0e\x66\x61ilureDetails\x18\x04 \x01(\x0b\x32\x13.TaskFailureDetails\x12\x17\n\x0f\x63ompletionToken\x18\x05 \x01(\t\"#\n\rCachedHistory\x12\x12\n\neventCount\x18\x01 \x01(\x05\"\xfa\x02\n\x0fWorkflowRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x31\n\x0b\x65xecutionId\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12!\n\npastEvents\x18\x03 \x03(\x0b\x32\r.HistoryEvent\x12 \n\tnewEvents\x18\x04 \x03(\x0b\x32\r.HistoryEvent\x12 \n\x18requiresHistoryStreaming\x18\x06 \x01(\x08\x12 \n\x06router\x18\x07 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x12\x32\n\x11propagatedHistory\x18\x08 \x01(\x0b\x32\x12.PropagatedHistoryH\x01\x88\x01\x01\x12*\n\rcachedHistory\x18\t \x01(\x0b\x32\x0e.CachedHistoryH\x02\x88\x01\x01\x42\t\n\x07_routerB\x14\n\x12_propagatedHistoryB\x10\n\x0e_cachedHistoryJ\x04\x08\x05\x10\x06\"\x82\x02\n\x10WorkflowResponse\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12 \n\x07\x61\x63tions\x18\x02 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+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1aorchestrator_service.proto\x1a\x13orchestration.proto\x1a\x14history_events.proto\x1a\x1aorchestrator_actions.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/wrappers.proto\x1a\x1bgoogle/protobuf/empty.proto\"\xc6\x02\n\x0f\x41\x63tivityRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\x12-\n\x07version\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x05input\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12+\n\x10workflowInstance\x18\x04 \x01(\x0b\x32\x11.WorkflowInstance\x12\x0e\n\x06taskId\x18\x05 \x01(\x05\x12)\n\x12parentTraceContext\x18\x06 \x01(\x0b\x32\r.TraceContext\x12\x17\n\x0ftaskExecutionId\x18\x07 \x01(\t\x12\x32\n\x11propagatedHistory\x18\x08 \x01(\x0b\x32\x12.PropagatedHistoryH\x00\x88\x01\x01\x42\x14\n\x12_propagatedHistory\"\xaa\x01\n\x10\x41\x63tivityResponse\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0e\n\x06taskId\x18\x02 \x01(\x05\x12,\n\x06result\x18\x03 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\x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x1a+\n\tTagsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x42\t\n\x07_routerJ\x04\x08\x06\x10\x07R\x1aorchestrationIdReusePolicy\",\n\x16\x43reateInstanceResponse\x12\x12\n\ninstanceId\x18\x01 \x01(\t\"r\n\x12GetInstanceRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x1b\n\x13getInputsAndOutputs\x18\x02 \x01(\x08\x12 \n\x06router\x18\x03 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x42\t\n\x07_router\"L\n\x13GetInstanceResponse\x12\x0e\n\x06\x65xists\x18\x01 \x01(\x08\x12%\n\rworkflowState\x18\x02 \x01(\x0b\x32\x0e.WorkflowState\"\x8f\x01\n\x11RaiseEventRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12\x0c\n\x04name\x18\x02 \x01(\t\x12+\n\x05input\x18\x03 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12 \n\x06router\x18\x04 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x42\t\n\x07_router\"\x14\n\x12RaiseEventResponse\"\x94\x01\n\x10TerminateRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12,\n\x06output\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x11\n\trecursive\x18\x03 \x01(\x08\x12 \n\x06router\x18\x04 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x42\t\n\x07_router\"\x13\n\x11TerminateResponse\"\x7f\n\x0eSuspendRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12,\n\x06reason\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12 \n\x06router\x18\x03 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x42\t\n\x07_router\"\x11\n\x0fSuspendResponse\"~\n\rResumeRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\x12,\n\x06reason\x18\x02 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12 \n\x06router\x18\x03 \x01(\x0b\x32\x0b.TaskRouterH\x00\x88\x01\x01\x42\t\n\x07_router\"\x10\n\x0eResumeResponse\"\xcb\x01\n\x15PurgeInstancesRequest\x12\x14\n\ninstanceId\x18\x01 \x01(\tH\x00\x12\x33\n\x13purgeInstanceFilter\x18\x02 \x01(\x0b\x32\x14.PurgeInstanceFilterH\x00\x12\x11\n\trecursive\x18\x03 \x01(\x08\x12\x12\n\x05\x66orce\x18\x04 \x01(\x08H\x01\x88\x01\x01\x12 \n\x06router\x18\x05 \x01(\x0b\x32\x0b.TaskRouterH\x02\x88\x01\x01\x42\t\n\x07requestB\x08\n\x06_forceB\t\n\x07_router\"\xaa\x01\n\x13PurgeInstanceFilter\x12\x33\n\x0f\x63reatedTimeFrom\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x31\n\rcreatedTimeTo\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12+\n\rruntimeStatus\x18\x03 \x03(\x0e\x32\x14.OrchestrationStatus\"f\n\x16PurgeInstancesResponse\x12\x1c\n\x14\x64\x65letedInstanceCount\x18\x01 \x01(\x05\x12.\n\nisComplete\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.BoolValue\"V\n\x13GetWorkItemsRequest\x12\'\n\x0c\x63\x61pabilities\x18\x04 \x03(\x0e\x32\x11.WorkerCapabilityJ\x04\x08\x01\x10\x02J\x04\x08\x02\x10\x03J\x04\x08\x03\x10\x04J\x04\x08\n\x10\x0b\"\x9a\x01\n\x08WorkItem\x12+\n\x0fworkflowRequest\x18\x01 \x01(\x0b\x32\x10.WorkflowRequestH\x00\x12+\n\x0f\x61\x63tivityRequest\x18\x02 \x01(\x0b\x32\x10.ActivityRequestH\x00\x12\x17\n\x0f\x63ompletionToken\x18\n \x01(\tB\t\n\x07requestJ\x04\x08\x03\x10\x04J\x04\x08\x04\x10\x05J\x04\x08\x05\x10\x06\"\x16\n\x14\x43ompleteTaskResponse\"\xb2\x02\n\x1dRerunWorkflowFromEventRequest\x12\x18\n\x10sourceInstanceID\x18\x01 \x01(\t\x12\x0f\n\x07\x65ventID\x18\x02 \x01(\r\x12\x1a\n\rnewInstanceID\x18\x03 \x01(\tH\x00\x88\x01\x01\x12+\n\x05input\x18\x04 \x01(\x0b\x32\x1c.google.protobuf.StringValue\x12\x16\n\x0eoverwriteInput\x18\x05 \x01(\x08\x12\'\n\x1anewChildWorkflowInstanceID\x18\x06 \x01(\tH\x01\x88\x01\x01\x12 \n\x06router\x18\x07 \x01(\x0b\x32\x0b.TaskRouterH\x02\x88\x01\x01\x42\x10\n\x0e_newInstanceIDB\x1d\n\x1b_newChildWorkflowInstanceIDB\t\n\x07_router\"7\n\x1eRerunWorkflowFromEventResponse\x12\x15\n\rnewInstanceID\x18\x01 \x01(\t\"r\n\x16ListInstanceIDsRequest\x12\x1e\n\x11\x63ontinuationToken\x18\x01 \x01(\tH\x00\x88\x01\x01\x12\x15\n\x08pageSize\x18\x02 \x01(\rH\x01\x88\x01\x01\x42\x14\n\x12_continuationTokenB\x0b\n\t_pageSize\"d\n\x17ListInstanceIDsResponse\x12\x13\n\x0binstanceIds\x18\x01 \x03(\t\x12\x1e\n\x11\x63ontinuationToken\x18\x02 \x01(\tH\x00\x88\x01\x01\x42\x14\n\x12_continuationToken\"/\n\x19GetInstanceHistoryRequest\x12\x12\n\ninstanceId\x18\x01 \x01(\t\";\n\x1aGetInstanceHistoryResponse\x12\x1d\n\x06\x65vents\x18\x01 \x03(\x0b\x32\r.HistoryEvent*\x88\x01\n\x10WorkerCapability\x12!\n\x1dWORKER_CAPABILITY_UNSPECIFIED\x10\x00\x12&\n\"WORKER_CAPABILITY_STATEFUL_HISTORY\x10\x02\"\x04\x08\x01\x10\x01*#WORKER_CAPABILITY_HISTORY_STREAMING2\xe8\x08\n\x15TaskHubSidecarService\x12\x37\n\x05Hello\x12\x16.google.protobuf.Empty\x1a\x16.google.protobuf.Empty\x12@\n\rStartInstance\x12\x16.CreateInstanceRequest\x1a\x17.CreateInstanceResponse\x12\x38\n\x0bGetInstance\x12\x13.GetInstanceRequest\x1a\x14.GetInstanceResponse\x12\x41\n\x14WaitForInstanceStart\x12\x13.GetInstanceRequest\x1a\x14.GetInstanceResponse\x12\x46\n\x19WaitForInstanceCompletion\x12\x13.GetInstanceRequest\x1a\x14.GetInstanceResponse\x12\x35\n\nRaiseEvent\x12\x12.RaiseEventRequest\x1a\x13.RaiseEventResponse\x12:\n\x11TerminateInstance\x12\x11.TerminateRequest\x1a\x12.TerminateResponse\x12\x34\n\x0fSuspendInstance\x12\x0f.SuspendRequest\x1a\x10.SuspendResponse\x12\x31\n\x0eResumeInstance\x12\x0e.ResumeRequest\x1a\x0f.ResumeResponse\x12\x41\n\x0ePurgeInstances\x12\x16.PurgeInstancesRequest\x1a\x17.PurgeInstancesResponse\x12\x31\n\x0cGetWorkItems\x12\x14.GetWorkItemsRequest\x1a\t.WorkItem0\x01\x12@\n\x14\x43ompleteActivityTask\x12\x11.ActivityResponse\x1a\x15.CompleteTaskResponse\x12I\n\x18\x43ompleteOrchestratorTask\x12\x11.WorkflowResponse\x1a\x15.CompleteTaskResponse\"\x03\x88\x02\x01\x12@\n\x14\x43ompleteWorkflowTask\x12\x11.WorkflowResponse\x1a\x15.CompleteTaskResponse\x12Y\n\x16RerunWorkflowFromEvent\x12\x1e.RerunWorkflowFromEventRequest\x1a\x1f.RerunWorkflowFromEventResponse\x12\x44\n\x0fListInstanceIDs\x12\x17.ListInstanceIDsRequest\x1a\x18.ListInstanceIDsResponse\x12M\n\x12GetInstanceHistory\x12\x1a.GetInstanceHistoryRequest\x1a\x1b.GetInstanceHistoryResponseBV\n+io.dapr.durabletask.implementation.protobufZ\x0b/api/protos\xaa\x02\x19\x44\x61pr.DurableTask.Protobufb\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -42,8 +42,8 @@
   _globals['_CREATEINSTANCEREQUEST_TAGSENTRY']._serialized_options = b'8\001'
   _globals['_TASKHUBSIDECARSERVICE'].methods_by_name['CompleteOrchestratorTask']._loaded_options = None
   _globals['_TASKHUBSIDECARSERVICE'].methods_by_name['CompleteOrchestratorTask']._serialized_options = b'\210\002\001'
-  _globals['_WORKERCAPABILITY']._serialized_start=3814
-  _globals['_WORKERCAPABILITY']._serialized_end=3950
+  _globals['_WORKERCAPABILITY']._serialized_start=4209
+  _globals['_WORKERCAPABILITY']._serialized_end=4345
   _globals['_ACTIVITYREQUEST']._serialized_start=196
   _globals['_ACTIVITYREQUEST']._serialized_end=522
   _globals['_ACTIVITYRESPONSE']._serialized_start=525
@@ -55,55 +55,55 @@
   _globals['_WORKFLOWRESPONSE']._serialized_start=1116
   _globals['_WORKFLOWRESPONSE']._serialized_end=1374
   _globals['_CREATEINSTANCEREQUEST']._serialized_start=1377
-  _globals['_CREATEINSTANCEREQUEST']._serialized_end=1808
-  _globals['_CREATEINSTANCEREQUEST_TAGSENTRY']._serialized_start=1731
-  _globals['_CREATEINSTANCEREQUEST_TAGSENTRY']._serialized_end=1774
-  _globals['_CREATEINSTANCERESPONSE']._serialized_start=1810
-  _globals['_CREATEINSTANCERESPONSE']._serialized_end=1854
-  _globals['_GETINSTANCEREQUEST']._serialized_start=1856
-  _globals['_GETINSTANCEREQUEST']._serialized_end=1925
-  _globals['_GETINSTANCERESPONSE']._serialized_start=1927
-  _globals['_GETINSTANCERESPONSE']._serialized_end=2003
-  _globals['_RAISEEVENTREQUEST']._serialized_start=2005
-  _globals['_RAISEEVENTREQUEST']._serialized_end=2103
-  _globals['_RAISEEVENTRESPONSE']._serialized_start=2105
-  _globals['_RAISEEVENTRESPONSE']._serialized_end=2125
-  _globals['_TERMINATEREQUEST']._serialized_start=2127
-  _globals['_TERMINATEREQUEST']._serialized_end=2230
-  _globals['_TERMINATERESPONSE']._serialized_start=2232
-  _globals['_TERMINATERESPONSE']._serialized_end=2251
-  _globals['_SUSPENDREQUEST']._serialized_start=2253
-  _globals['_SUSPENDREQUEST']._serialized_end=2335
-  _globals['_SUSPENDRESPONSE']._serialized_start=2337
-  _globals['_SUSPENDRESPONSE']._serialized_end=2354
-  _globals['_RESUMEREQUEST']._serialized_start=2356
-  _globals['_RESUMEREQUEST']._serialized_end=2437
-  _globals['_RESUMERESPONSE']._serialized_start=2439
-  _globals['_RESUMERESPONSE']._serialized_end=2455
-  _globals['_PURGEINSTANCESREQUEST']._serialized_start=2458
-  _globals['_PURGEINSTANCESREQUEST']._serialized_end=2616
-  _globals['_PURGEINSTANCEFILTER']._serialized_start=2619
-  _globals['_PURGEINSTANCEFILTER']._serialized_end=2789
-  _globals['_PURGEINSTANCESRESPONSE']._serialized_start=2791
-  _globals['_PURGEINSTANCESRESPONSE']._serialized_end=2893
-  _globals['_GETWORKITEMSREQUEST']._serialized_start=2895
-  _globals['_GETWORKITEMSREQUEST']._serialized_end=2981
-  _globals['_WORKITEM']._serialized_start=2984
-  _globals['_WORKITEM']._serialized_end=3138
-  _globals['_COMPLETETASKRESPONSE']._serialized_start=3140
-  _globals['_COMPLETETASKRESPONSE']._serialized_end=3162
-  _globals['_RERUNWORKFLOWFROMEVENTREQUEST']._serialized_start=3165
-  _globals['_RERUNWORKFLOWFROMEVENTREQUEST']._serialized_end=3426
-  _globals['_RERUNWORKFLOWFROMEVENTRESPONSE']._serialized_start=3428
-  _globals['_RERUNWORKFLOWFROMEVENTRESPONSE']._serialized_end=3483
-  _globals['_LISTINSTANCEIDSREQUEST']._serialized_start=3485
-  _globals['_LISTINSTANCEIDSREQUEST']._serialized_end=3599
-  _globals['_LISTINSTANCEIDSRESPONSE']._serialized_start=3601
-  _globals['_LISTINSTANCEIDSRESPONSE']._serialized_end=3701
-  _globals['_GETINSTANCEHISTORYREQUEST']._serialized_start=3703
-  _globals['_GETINSTANCEHISTORYREQUEST']._serialized_end=3750
-  _globals['_GETINSTANCEHISTORYRESPONSE']._serialized_start=3752
-  _globals['_GETINSTANCEHISTORYRESPONSE']._serialized_end=3811
-  _globals['_TASKHUBSIDECARSERVICE']._serialized_start=3953
-  _globals['_TASKHUBSIDECARSERVICE']._serialized_end=5081
+  _globals['_CREATEINSTANCEREQUEST']._serialized_end=1886
+  _globals['_CREATEINSTANCEREQUEST_TAGSENTRY']._serialized_start=1798
+  _globals['_CREATEINSTANCEREQUEST_TAGSENTRY']._serialized_end=1841
+  _globals['_CREATEINSTANCERESPONSE']._serialized_start=1888
+  _globals['_CREATEINSTANCERESPONSE']._serialized_end=1932
+  _globals['_GETINSTANCEREQUEST']._serialized_start=1934
+  _globals['_GETINSTANCEREQUEST']._serialized_end=2048
+  _globals['_GETINSTANCERESPONSE']._serialized_start=2050
+  _globals['_GETINSTANCERESPONSE']._serialized_end=2126
+  _globals['_RAISEEVENTREQUEST']._serialized_start=2129
+  _globals['_RAISEEVENTREQUEST']._serialized_end=2272
+  _globals['_RAISEEVENTRESPONSE']._serialized_start=2274
+  _globals['_RAISEEVENTRESPONSE']._serialized_end=2294
+  _globals['_TERMINATEREQUEST']._serialized_start=2297
+  _globals['_TERMINATEREQUEST']._serialized_end=2445
+  _globals['_TERMINATERESPONSE']._serialized_start=2447
+  _globals['_TERMINATERESPONSE']._serialized_end=2466
+  _globals['_SUSPENDREQUEST']._serialized_start=2468
+  _globals['_SUSPENDREQUEST']._serialized_end=2595
+  _globals['_SUSPENDRESPONSE']._serialized_start=2597
+  _globals['_SUSPENDRESPONSE']._serialized_end=2614
+  _globals['_RESUMEREQUEST']._serialized_start=2616
+  _globals['_RESUMEREQUEST']._serialized_end=2742
+  _globals['_RESUMERESPONSE']._serialized_start=2744
+  _globals['_RESUMERESPONSE']._serialized_end=2760
+  _globals['_PURGEINSTANCESREQUEST']._serialized_start=2763
+  _globals['_PURGEINSTANCESREQUEST']._serialized_end=2966
+  _globals['_PURGEINSTANCEFILTER']._serialized_start=2969
+  _globals['_PURGEINSTANCEFILTER']._serialized_end=3139
+  _globals['_PURGEINSTANCESRESPONSE']._serialized_start=3141
+  _globals['_PURGEINSTANCESRESPONSE']._serialized_end=3243
+  _globals['_GETWORKITEMSREQUEST']._serialized_start=3245
+  _globals['_GETWORKITEMSREQUEST']._serialized_end=3331
+  _globals['_WORKITEM']._serialized_start=3334
+  _globals['_WORKITEM']._serialized_end=3488
+  _globals['_COMPLETETASKRESPONSE']._serialized_start=3490
+  _globals['_COMPLETETASKRESPONSE']._serialized_end=3512
+  _globals['_RERUNWORKFLOWFROMEVENTREQUEST']._serialized_start=3515
+  _globals['_RERUNWORKFLOWFROMEVENTREQUEST']._serialized_end=3821
+  _globals['_RERUNWORKFLOWFROMEVENTRESPONSE']._serialized_start=3823
+  _globals['_RERUNWORKFLOWFROMEVENTRESPONSE']._serialized_end=3878
+  _globals['_LISTINSTANCEIDSREQUEST']._serialized_start=3880
+  _globals['_LISTINSTANCEIDSREQUEST']._serialized_end=3994
+  _globals['_LISTINSTANCEIDSRESPONSE']._serialized_start=3996
+  _globals['_LISTINSTANCEIDSRESPONSE']._serialized_end=4096
+  _globals['_GETINSTANCEHISTORYREQUEST']._serialized_start=4098
+  _globals['_GETINSTANCEHISTORYREQUEST']._serialized_end=4145
+  _globals['_GETINSTANCEHISTORYRESPONSE']._serialized_start=4147
+  _globals['_GETINSTANCEHISTORYRESPONSE']._serialized_end=4206
+  _globals['_TASKHUBSIDECARSERVICE']._serialized_start=4348
+  _globals['_TASKHUBSIDECARSERVICE']._serialized_end=5476
 # @@protoc_insertion_point(module_scope)
diff --git a/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.pyi b/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.pyi
index dcce421a4..40cc431b7 100644
--- a/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.pyi
+++ b/dapr/ext/workflow/_durabletask/internal/orchestrator_service_pb2.pyi
@@ -322,8 +322,15 @@ class CreateInstanceRequest(_message.Message):
     EXECUTIONID_FIELD_NUMBER: _builtins.int
     TAGS_FIELD_NUMBER: _builtins.int
     PARENTTRACECONTEXT_FIELD_NUMBER: _builtins.int
+    ENFORCEUNIQUEINSTANCEID_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     name: _builtins.str
+    enforceUniqueInstanceId: _builtins.bool
+    """When true, the request fails with an ALREADY_EXISTS error if a workflow
+    instance with the same instanceId already exists, whether active or
+    completed. When false, an existing completed instance is restarted.
+    """
     @_builtins.property
     def version(self) -> _wrappers_pb2.StringValue: ...
     @_builtins.property
@@ -336,6 +343,15 @@ class CreateInstanceRequest(_message.Message):
     def tags(self) -> _containers.ScalarMap[_builtins.str, _builtins.str]: ...
     @_builtins.property
     def parentTraceContext(self) -> _orchestration_pb2.TraceContext: ...
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. When targetAppID names a different app, the operation is
+        executed against that app's instance (same namespace unless
+        targetAppNamespace is set). sourceAppID is stamped by the sidecar, not
+        the client.
+        """
+
     def __init__(
         self,
         *,
@@ -347,11 +363,16 @@ class CreateInstanceRequest(_message.Message):
         executionId: _wrappers_pb2.StringValue | None = ...,
         tags: _abc.Mapping[_builtins.str, _builtins.str] | None = ...,
         parentTraceContext: _orchestration_pb2.TraceContext | None = ...,
+        enforceUniqueInstanceId: _builtins.bool = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["executionId", b"executionId", "input", b"input", "parentTraceContext", b"parentTraceContext", "scheduledStartTimestamp", b"scheduledStartTimestamp", "version", b"version"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "executionId", b"executionId", "input", b"input", "parentTraceContext", b"parentTraceContext", "router", b"router", "scheduledStartTimestamp", b"scheduledStartTimestamp", "version", b"version"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["executionId", b"executionId", "input", b"input", "instanceId", b"instanceId", "name", b"name", "parentTraceContext", b"parentTraceContext", "scheduledStartTimestamp", b"scheduledStartTimestamp", "tags", b"tags", "version", b"version"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "enforceUniqueInstanceId", b"enforceUniqueInstanceId", "executionId", b"executionId", "input", b"input", "instanceId", b"instanceId", "name", b"name", "parentTraceContext", b"parentTraceContext", "router", b"router", "scheduledStartTimestamp", b"scheduledStartTimestamp", "tags", b"tags", "version", b"version"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___CreateInstanceRequest: _TypeAlias = CreateInstanceRequest  # noqa: Y015
 
@@ -377,16 +398,29 @@ class GetInstanceRequest(_message.Message):
 
     INSTANCEID_FIELD_NUMBER: _builtins.int
     GETINPUTSANDOUTPUTS_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     getInputsAndOutputs: _builtins.bool
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. sourceAppID is stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
         instanceId: _builtins.str = ...,
         getInputsAndOutputs: _builtins.bool = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["getInputsAndOutputs", b"getInputsAndOutputs", "instanceId", b"instanceId"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "router", b"router"]  # noqa: Y015
+    def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "getInputsAndOutputs", b"getInputsAndOutputs", "instanceId", b"instanceId", "router", b"router"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___GetInstanceRequest: _TypeAlias = GetInstanceRequest  # noqa: Y015
 
@@ -419,21 +453,32 @@ class RaiseEventRequest(_message.Message):
     INSTANCEID_FIELD_NUMBER: _builtins.int
     NAME_FIELD_NUMBER: _builtins.int
     INPUT_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     name: _builtins.str
     @_builtins.property
     def input(self) -> _wrappers_pb2.StringValue: ...
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. sourceAppID is stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
         instanceId: _builtins.str = ...,
         name: _builtins.str = ...,
         input: _wrappers_pb2.StringValue | None = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["input", b"input"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "input", b"input", "router", b"router"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["input", b"input", "instanceId", b"instanceId", "name", b"name"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "input", b"input", "instanceId", b"instanceId", "name", b"name", "router", b"router"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___RaiseEventRequest: _TypeAlias = RaiseEventRequest  # noqa: Y015
 
@@ -456,21 +501,32 @@ class TerminateRequest(_message.Message):
     INSTANCEID_FIELD_NUMBER: _builtins.int
     OUTPUT_FIELD_NUMBER: _builtins.int
     RECURSIVE_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     recursive: _builtins.bool
     @_builtins.property
     def output(self) -> _wrappers_pb2.StringValue: ...
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. sourceAppID is stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
         instanceId: _builtins.str = ...,
         output: _wrappers_pb2.StringValue | None = ...,
         recursive: _builtins.bool = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["output", b"output"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "output", b"output", "router", b"router"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["instanceId", b"instanceId", "output", b"output", "recursive", b"recursive"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "instanceId", b"instanceId", "output", b"output", "recursive", b"recursive", "router", b"router"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___TerminateRequest: _TypeAlias = TerminateRequest  # noqa: Y015
 
@@ -492,19 +548,30 @@ class SuspendRequest(_message.Message):
 
     INSTANCEID_FIELD_NUMBER: _builtins.int
     REASON_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     @_builtins.property
     def reason(self) -> _wrappers_pb2.StringValue: ...
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. sourceAppID is stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
         instanceId: _builtins.str = ...,
         reason: _wrappers_pb2.StringValue | None = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["reason", b"reason"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "reason", b"reason", "router", b"router"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["instanceId", b"instanceId", "reason", b"reason"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "instanceId", b"instanceId", "reason", b"reason", "router", b"router"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___SuspendRequest: _TypeAlias = SuspendRequest  # noqa: Y015
 
@@ -526,19 +593,30 @@ class ResumeRequest(_message.Message):
 
     INSTANCEID_FIELD_NUMBER: _builtins.int
     REASON_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     @_builtins.property
     def reason(self) -> _wrappers_pb2.StringValue: ...
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. sourceAppID is stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
         instanceId: _builtins.str = ...,
         reason: _wrappers_pb2.StringValue | None = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["reason", b"reason"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "reason", b"reason", "router", b"router"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["instanceId", b"instanceId", "reason", b"reason"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_router", b"_router", "instanceId", b"instanceId", "reason", b"reason", "router", b"router"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___ResumeRequest: _TypeAlias = ResumeRequest  # noqa: Y015
 
@@ -562,6 +640,7 @@ class PurgeInstancesRequest(_message.Message):
     PURGEINSTANCEFILTER_FIELD_NUMBER: _builtins.int
     RECURSIVE_FIELD_NUMBER: _builtins.int
     FORCE_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     instanceId: _builtins.str
     recursive: _builtins.bool
     force: _builtins.bool
@@ -577,6 +656,14 @@ class PurgeInstancesRequest(_message.Message):
     """
     @_builtins.property
     def purgeInstanceFilter(self) -> Global___PurgeInstanceFilter: ...
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. Cross-app purges are delegated to the target app in
+        full, so they are always recursive on the remote side. sourceAppID is
+        stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
@@ -584,18 +671,23 @@ class PurgeInstancesRequest(_message.Message):
         purgeInstanceFilter: Global___PurgeInstanceFilter | None = ...,
         recursive: _builtins.bool = ...,
         force: _builtins.bool | None = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["_force", b"_force", "force", b"force", "instanceId", b"instanceId", "purgeInstanceFilter", b"purgeInstanceFilter", "request", b"request"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_force", b"_force", "_router", b"_router", "force", b"force", "instanceId", b"instanceId", "purgeInstanceFilter", b"purgeInstanceFilter", "request", b"request", "router", b"router"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_force", b"_force", "force", b"force", "instanceId", b"instanceId", "purgeInstanceFilter", b"purgeInstanceFilter", "recursive", b"recursive", "request", b"request"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_force", b"_force", "_router", b"_router", "force", b"force", "instanceId", b"instanceId", "purgeInstanceFilter", b"purgeInstanceFilter", "recursive", b"recursive", "request", b"request", "router", b"router"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__force: _TypeAlias = _typing.Literal["force"]  # noqa: Y015
     _WhichOneofArgType__force: _TypeAlias = _typing.Literal["_force", b"_force"]  # noqa: Y015
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
     _WhichOneofReturnType_request: _TypeAlias = _typing.Literal["instanceId", "purgeInstanceFilter"]  # noqa: Y015
     _WhichOneofArgType_request: _TypeAlias = _typing.Literal["request", b"request"]  # noqa: Y015
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__force) -> _WhichOneofReturnType__force | None: ...
     @_typing.overload
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
+    @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType_request) -> _WhichOneofReturnType_request | None: ...
 
 Global___PurgeInstancesRequest: _TypeAlias = PurgeInstancesRequest  # noqa: Y015
@@ -727,6 +819,7 @@ class RerunWorkflowFromEventRequest(_message.Message):
     INPUT_FIELD_NUMBER: _builtins.int
     OVERWRITEINPUT_FIELD_NUMBER: _builtins.int
     NEWCHILDWORKFLOWINSTANCEID_FIELD_NUMBER: _builtins.int
+    ROUTER_FIELD_NUMBER: _builtins.int
     sourceInstanceID: _builtins.str
     """sourceInstanceID is the workflow instance ID to rerun. Can be a top
     level instance, or child workflow instance.
@@ -754,6 +847,12 @@ class RerunWorkflowFromEventRequest(_message.Message):
         the next Activity event.
         """
 
+    @_builtins.property
+    def router(self) -> _orchestration_pb2.TaskRouter:
+        """router optionally routes this operation to the workflow instance owned
+        by another app. sourceAppID is stamped by the sidecar, not the client.
+        """
+
     def __init__(
         self,
         *,
@@ -763,19 +862,24 @@ class RerunWorkflowFromEventRequest(_message.Message):
         input: _wrappers_pb2.StringValue | None = ...,
         overwriteInput: _builtins.bool = ...,
         newChildWorkflowInstanceID: _builtins.str | None = ...,
+        router: _orchestration_pb2.TaskRouter | None = ...,
     ) -> None: ...
-    _HasFieldArgType: _TypeAlias = _typing.Literal["_newChildWorkflowInstanceID", b"_newChildWorkflowInstanceID", "_newInstanceID", b"_newInstanceID", "input", b"input", "newChildWorkflowInstanceID", b"newChildWorkflowInstanceID", "newInstanceID", b"newInstanceID"]  # noqa: Y015
+    _HasFieldArgType: _TypeAlias = _typing.Literal["_newChildWorkflowInstanceID", b"_newChildWorkflowInstanceID", "_newInstanceID", b"_newInstanceID", "_router", b"_router", "input", b"input", "newChildWorkflowInstanceID", b"newChildWorkflowInstanceID", "newInstanceID", b"newInstanceID", "router", b"router"]  # noqa: Y015
     def HasField(self, field_name: _HasFieldArgType) -> _builtins.bool: ...
-    _ClearFieldArgType: _TypeAlias = _typing.Literal["_newChildWorkflowInstanceID", b"_newChildWorkflowInstanceID", "_newInstanceID", b"_newInstanceID", "eventID", b"eventID", "input", b"input", "newChildWorkflowInstanceID", b"newChildWorkflowInstanceID", "newInstanceID", b"newInstanceID", "overwriteInput", b"overwriteInput", "sourceInstanceID", b"sourceInstanceID"]  # noqa: Y015
+    _ClearFieldArgType: _TypeAlias = _typing.Literal["_newChildWorkflowInstanceID", b"_newChildWorkflowInstanceID", "_newInstanceID", b"_newInstanceID", "_router", b"_router", "eventID", b"eventID", "input", b"input", "newChildWorkflowInstanceID", b"newChildWorkflowInstanceID", "newInstanceID", b"newInstanceID", "overwriteInput", b"overwriteInput", "router", b"router", "sourceInstanceID", b"sourceInstanceID"]  # noqa: Y015
     def ClearField(self, field_name: _ClearFieldArgType) -> None: ...
     _WhichOneofReturnType__newChildWorkflowInstanceID: _TypeAlias = _typing.Literal["newChildWorkflowInstanceID"]  # noqa: Y015
     _WhichOneofArgType__newChildWorkflowInstanceID: _TypeAlias = _typing.Literal["_newChildWorkflowInstanceID", b"_newChildWorkflowInstanceID"]  # noqa: Y015
     _WhichOneofReturnType__newInstanceID: _TypeAlias = _typing.Literal["newInstanceID"]  # noqa: Y015
     _WhichOneofArgType__newInstanceID: _TypeAlias = _typing.Literal["_newInstanceID", b"_newInstanceID"]  # noqa: Y015
+    _WhichOneofReturnType__router: _TypeAlias = _typing.Literal["router"]  # noqa: Y015
+    _WhichOneofArgType__router: _TypeAlias = _typing.Literal["_router", b"_router"]  # noqa: Y015
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__newChildWorkflowInstanceID) -> _WhichOneofReturnType__newChildWorkflowInstanceID | None: ...
     @_typing.overload
     def WhichOneof(self, oneof_group: _WhichOneofArgType__newInstanceID) -> _WhichOneofReturnType__newInstanceID | None: ...
+    @_typing.overload
+    def WhichOneof(self, oneof_group: _WhichOneofArgType__router) -> _WhichOneofReturnType__router | None: ...
 
 Global___RerunWorkflowFromEventRequest: _TypeAlias = RerunWorkflowFromEventRequest  # noqa: Y015
 
diff --git a/dapr/ext/workflow/aio/dapr_workflow_client.py b/dapr/ext/workflow/aio/dapr_workflow_client.py
index 8a6072cf2..552ec35f2 100644
--- a/dapr/ext/workflow/aio/dapr_workflow_client.py
+++ b/dapr/ext/workflow/aio/dapr_workflow_client.py
@@ -98,6 +98,7 @@ async def schedule_new_workflow(
         instance_id: Optional[str] = None,
         start_at: Optional[datetime] = None,
         reuse_id_policy: Optional[client.WorkflowIdReusePolicy] = None,
+        app_id: Optional[str] = None,
     ) -> str:
         """Schedules a new workflow instance for execution.
 
@@ -113,6 +114,10 @@ async def schedule_new_workflow(
             reuse_id_policy: Deprecated and has no effect; it will be removed in a future
             release. A workflow instance ID can always be reused once the existing instance
             with that ID has reached a terminal state (e.g. COMPLETED, FAILED, or TERMINATED).
+            app_id: The optional ID of another app to schedule the workflow on. The target
+            app's WorkflowAccessPolicy governs whether this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             The ID of the scheduled workflow instance.
@@ -138,10 +143,15 @@ async def schedule_new_workflow(
             instance_id=instance_id,
             start_at=start_at,
             reuse_id_policy=reuse_id_policy,
+            app_id=app_id,
         )
 
     async def get_workflow_state(
-        self, instance_id: str, *, fetch_payloads: bool = True
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
         """Fetches runtime state for the specified workflow instance.
 
@@ -149,6 +159,11 @@ async def get_workflow_state(
             instance_id: The unique ID of the workflow instance to fetch.
             fetch_payloads: If true, fetches the input, output payloads and custom status
             for the workflow instance. Defaults to true.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             The current state of the workflow instance, or None if the workflow instance does not
@@ -157,7 +172,9 @@ async def get_workflow_state(
         """
         try:
             state = await self.__obj.get_orchestration_state(
-                instance_id, fetch_payloads=fetch_payloads
+                instance_id,
+                fetch_payloads=fetch_payloads,
+                app_id=app_id,
             )
             return WorkflowState(state) if state else None
         except AioRpcError as error:
@@ -170,7 +187,12 @@ async def get_workflow_state(
             raise
 
     async def wait_for_workflow_start(
-        self, instance_id: str, *, fetch_payloads: bool = False, timeout_in_seconds: int = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = False,
+        timeout_in_seconds: int = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
         """Waits for a workflow to start running and returns a WorkflowState object that contains
            metadata about the started workflow.
@@ -185,18 +207,31 @@ async def wait_for_workflow_start(
             the workflow instance. Defaults to false.
             timeout_in_seconds: The maximum time to wait for the workflow instance to start running.
             Defaults to meaning no timeout.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             WorkflowState record that describes the workflow instance and its execution status.
             If the specified workflow isn't found, the WorkflowState.Exists value will be false.
         """
         state = await self.__obj.wait_for_orchestration_start(
-            instance_id, fetch_payloads=fetch_payloads, timeout=timeout_in_seconds
+            instance_id,
+            fetch_payloads=fetch_payloads,
+            timeout=timeout_in_seconds,
+            app_id=app_id,
         )
         return WorkflowState(state) if state else None
 
     async def wait_for_workflow_completion(
-        self, instance_id: str, *, fetch_payloads: bool = True, timeout_in_seconds: int = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        timeout_in_seconds: int = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
         """Waits for a workflow to complete and returns a WorkflowState object that contains
            metadata about the started instance.
@@ -219,17 +254,30 @@ async def wait_for_workflow_completion(
             for the workflow instance. Defaults to true.
             timeout_in_seconds: The maximum time in seconds to wait for the workflow instance to
             complete. Defaults to 0 seconds, meaning no timeout.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             WorkflowState record that describes the workflow instance and its execution status.
         """
         state = await self.__obj.wait_for_orchestration_completion(
-            instance_id, fetch_payloads=fetch_payloads, timeout=timeout_in_seconds
+            instance_id,
+            fetch_payloads=fetch_payloads,
+            timeout=timeout_in_seconds,
+            app_id=app_id,
         )
         return WorkflowState(state) if state else None
 
     async def raise_workflow_event(
-        self, instance_id: str, event_name: str, *, data: Optional[Any] = None
+        self,
+        instance_id: str,
+        event_name: str,
+        *,
+        data: Optional[Any] = None,
+        app_id: Optional[str] = None,
     ) -> None:
         """Sends an event notification message to a waiting workflow instance.
            In order to handle the event, the target workflow instance must be waiting for an
@@ -251,11 +299,23 @@ async def raise_workflow_event(
             instance_id: The ID of the workflow instance that will handle the event.
             event_name: The name of the event. Event names are case-insensitive.
             data: The serializable data payload to include with the event.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return await self.__obj.raise_orchestration_event(instance_id, event_name, data=data)
+        return await self.__obj.raise_orchestration_event(
+            instance_id, event_name, data=data, app_id=app_id
+        )
 
     async def terminate_workflow(
-        self, instance_id: str, *, output: Optional[Any] = None, recursive: bool = True
+        self,
+        instance_id: str,
+        *,
+        output: Optional[Any] = None,
+        recursive: bool = True,
+        app_id: Optional[str] = None,
     ) -> None:
         """Terminates a running workflow instance and updates its runtime status to
            WorkflowRuntimeStatus.Terminated This method internally enqueues a "terminate" message in
@@ -275,34 +335,73 @@ async def terminate_workflow(
             instance_id: The ID of the workflow instance to terminate.
             output: The optional output to set for the terminated workflow instance.
             recursive: The optional flag to terminate all child workflows.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         """
         return await self.__obj.terminate_orchestration(
-            instance_id, output=output, recursive=recursive
+            instance_id,
+            output=output,
+            recursive=recursive,
+            app_id=app_id,
         )
 
-    async def pause_workflow(self, instance_id: str) -> None:
+    async def pause_workflow(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ) -> None:
         """Suspends a workflow instance, halting processing of it until resume_workflow is used to
            resume the workflow.
 
         Args:
             instance_id: The instance ID of the workflow to suspend.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return await self.__obj.suspend_orchestration(instance_id)
+        return await self.__obj.suspend_orchestration(instance_id, app_id=app_id)
 
-    async def resume_workflow(self, instance_id: str) -> None:
+    async def resume_workflow(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ) -> None:
         """Resumes a workflow instance that was suspended via pause_workflow.
 
         Args:
             instance_id: The instance ID of the workflow to resume.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return await self.__obj.resume_orchestration(instance_id)
+        return await self.__obj.resume_orchestration(instance_id, app_id=app_id)
 
-    async def purge_workflow(self, instance_id: str, recursive: bool = True) -> None:
+    async def purge_workflow(
+        self,
+        instance_id: str,
+        recursive: bool = True,
+        *,
+        app_id: Optional[str] = None,
+    ) -> None:
         """Purge data from a workflow instance.
 
         Args:
             instance_id: The instance ID of the workflow to purge.
             recursive: The optional flag to also purge data from all child workflows.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return await self.__obj.purge_orchestration(instance_id, recursive)
+        return await self.__obj.purge_orchestration(instance_id, recursive, app_id=app_id)
diff --git a/dapr/ext/workflow/dapr_workflow_client.py b/dapr/ext/workflow/dapr_workflow_client.py
index dca65c200..02be04f88 100644
--- a/dapr/ext/workflow/dapr_workflow_client.py
+++ b/dapr/ext/workflow/dapr_workflow_client.py
@@ -100,6 +100,7 @@ def schedule_new_workflow(
         instance_id: Optional[str] = None,
         start_at: Optional[datetime] = None,
         reuse_id_policy: Optional[client.WorkflowIdReusePolicy] = None,
+        app_id: Optional[str] = None,
     ) -> str:
         """Schedules a new workflow instance for execution.
 
@@ -115,6 +116,10 @@ def schedule_new_workflow(
             reuse_id_policy: Deprecated and has no effect; it will be removed in a future
             release. A workflow instance ID can always be reused once the existing instance
             with that ID has reached a terminal state (e.g. COMPLETED, FAILED, or TERMINATED).
+            app_id: The optional ID of another app to schedule the workflow on. The target
+            app's WorkflowAccessPolicy governs whether this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             The ID of the scheduled workflow instance.
@@ -140,10 +145,15 @@ def schedule_new_workflow(
             instance_id=instance_id,
             start_at=start_at,
             reuse_id_policy=reuse_id_policy,
+            app_id=app_id,
         )
 
     def get_workflow_state(
-        self, instance_id: str, *, fetch_payloads: bool = True
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
         """Fetches runtime state for the specified workflow instance.
 
@@ -151,6 +161,11 @@ def get_workflow_state(
             instance_id: The unique ID of the workflow instance to fetch.
             fetch_payloads: If true, fetches the input, output payloads and custom status
             for the workflow instance. Defaults to true.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             The current state of the workflow instance, or None if the workflow instance does not
@@ -158,7 +173,11 @@ def get_workflow_state(
 
         """
         try:
-            state = self.__obj.get_orchestration_state(instance_id, fetch_payloads=fetch_payloads)
+            state = self.__obj.get_orchestration_state(
+                instance_id,
+                fetch_payloads=fetch_payloads,
+                app_id=app_id,
+            )
             return WorkflowState(state) if state else None
         except RpcError as error:
             if 'no such instance exists' in error.details():
@@ -170,7 +189,12 @@ def get_workflow_state(
             raise
 
     def wait_for_workflow_start(
-        self, instance_id: str, *, fetch_payloads: bool = False, timeout_in_seconds: int = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = False,
+        timeout_in_seconds: int = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
         """Waits for a workflow to start running and returns a WorkflowState object that contains
            metadata about the started workflow.
@@ -185,18 +209,31 @@ def wait_for_workflow_start(
             the workflow instance. Defaults to false.
             timeout_in_seconds: The maximum time to wait for the workflow instance to start running.
             Defaults to meaning no timeout.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             WorkflowState record that describes the workflow instance and its execution status.
             If the specified workflow isn't found, the WorkflowState.Exists value will be false.
         """
         state = self.__obj.wait_for_orchestration_start(
-            instance_id, fetch_payloads=fetch_payloads, timeout=timeout_in_seconds
+            instance_id,
+            fetch_payloads=fetch_payloads,
+            timeout=timeout_in_seconds,
+            app_id=app_id,
         )
         return WorkflowState(state) if state else None
 
     def wait_for_workflow_completion(
-        self, instance_id: str, *, fetch_payloads: bool = True, timeout_in_seconds: int = 0
+        self,
+        instance_id: str,
+        *,
+        fetch_payloads: bool = True,
+        timeout_in_seconds: int = 0,
+        app_id: Optional[str] = None,
     ) -> Optional[WorkflowState]:
         """Waits for a workflow to complete and returns a WorkflowState object that contains
            metadata about the started instance.
@@ -219,17 +256,30 @@ def wait_for_workflow_completion(
             for the workflow instance. Defaults to true.
             timeout_in_seconds: The maximum time in seconds to wait for the workflow instance to
             complete. Defaults to 0 seconds, meaning no timeout.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         Returns:
             WorkflowState record that describes the workflow instance and its execution status.
         """
         state = self.__obj.wait_for_orchestration_completion(
-            instance_id, fetch_payloads=fetch_payloads, timeout=timeout_in_seconds
+            instance_id,
+            fetch_payloads=fetch_payloads,
+            timeout=timeout_in_seconds,
+            app_id=app_id,
         )
         return WorkflowState(state) if state else None
 
     def raise_workflow_event(
-        self, instance_id: str, event_name: str, *, data: Optional[Any] = None
+        self,
+        instance_id: str,
+        event_name: str,
+        *,
+        data: Optional[Any] = None,
+        app_id: Optional[str] = None,
     ):
         """Sends an event notification message to a waiting workflow instance.
            In order to handle the event, the target workflow instance must be waiting for an
@@ -251,11 +301,23 @@ def raise_workflow_event(
             instance_id: The ID of the workflow instance that will handle the event.
             event_name: The name of the event. Event names are case-insensitive.
             data: The serializable data payload to include with the event.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return self.__obj.raise_orchestration_event(instance_id, event_name, data=data)
+        return self.__obj.raise_orchestration_event(
+            instance_id, event_name, data=data, app_id=app_id
+        )
 
     def terminate_workflow(
-        self, instance_id: str, *, output: Optional[Any] = None, recursive: bool = True
+        self,
+        instance_id: str,
+        *,
+        output: Optional[Any] = None,
+        recursive: bool = True,
+        app_id: Optional[str] = None,
     ):
         """Terminates a running workflow instance and updates its runtime status to
            WorkflowRuntimeStatus.Terminated This method internally enqueues a "terminate" message in
@@ -275,35 +337,76 @@ def terminate_workflow(
             instance_id: The ID of the workflow instance to terminate.
             output: The optional output to set for the terminated workflow instance.
             recursive: The optional flag to terminate all child workflows.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
 
         """
-        return self.__obj.terminate_orchestration(instance_id, output=output, recursive=recursive)
+        return self.__obj.terminate_orchestration(
+            instance_id,
+            output=output,
+            recursive=recursive,
+            app_id=app_id,
+        )
 
-    def pause_workflow(self, instance_id: str):
+    def pause_workflow(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ):
         """Suspends a workflow instance, halting processing of it until resume_workflow is used to
            resume the workflow.
 
         Args:
             instance_id: The instance ID of the workflow to suspend.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return self.__obj.suspend_orchestration(instance_id)
+        return self.__obj.suspend_orchestration(instance_id, app_id=app_id)
 
-    def resume_workflow(self, instance_id: str):
+    def resume_workflow(
+        self,
+        instance_id: str,
+        *,
+        app_id: Optional[str] = None,
+    ):
         """Resumes a workflow instance that was suspended via pause_workflow.
 
         Args:
             instance_id: The instance ID of the workflow to resume.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return self.__obj.resume_orchestration(instance_id)
+        return self.__obj.resume_orchestration(instance_id, app_id=app_id)
 
-    def purge_workflow(self, instance_id: str, recursive: bool = True):
+    def purge_workflow(
+        self,
+        instance_id: str,
+        recursive: bool = True,
+        *,
+        app_id: Optional[str] = None,
+    ):
         """Purge data from a workflow instance.
 
         Args:
             instance_id: The instance ID of the workflow to purge.
             recursive: The optional flag to also purge data from all child workflows.
+            app_id: The optional ID of the app hosting the workflow instance, when it is
+            hosted by a different app. The target app's WorkflowAccessPolicy governs whether
+            this operation is permitted.
+            Requires a Dapr runtime with cross-app workflow support; older runtimes
+            ignore app_id and apply the operation to the local app.
         """
-        return self.__obj.purge_orchestration(instance_id, recursive)
+        return self.__obj.purge_orchestration(instance_id, recursive, app_id=app_id)
 
     def close(self):
         """Closes the gRPC connection used by the client."""
diff --git a/tests/ext/workflow/durabletask/test_client_routing.py b/tests/ext/workflow/durabletask/test_client_routing.py
new file mode 100644
index 000000000..414f26da0
--- /dev/null
+++ b/tests/ext/workflow/durabletask/test_client_routing.py
@@ -0,0 +1,195 @@
+# Copyright 2026 The Dapr Authors
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#     http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for cross-app routing (TaskRouter) support in the durabletask clients."""
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import dapr.ext.workflow._durabletask.internal.protos as pb
+from dapr.ext.workflow._durabletask.aio.client import AsyncTaskHubGrpcClient
+from dapr.ext.workflow._durabletask.client import TaskHubGrpcClient, new_task_router
+
+TARGET_APP_ID = 'appB'
+INSTANCE_ID = 'instance001'
+
+
+def _make_sync_client() -> TaskHubGrpcClient:
+    with patch('grpc.insecure_channel'):
+        hub_client = TaskHubGrpcClient(host_address='localhost:1')
+    stub = MagicMock()
+    stub.StartInstance.return_value = pb.CreateInstanceResponse(instanceId=INSTANCE_ID)
+    stub.GetInstance.return_value = pb.GetInstanceResponse(exists=False)
+    stub.WaitForInstanceStart.return_value = pb.GetInstanceResponse(exists=False)
+    stub.WaitForInstanceCompletion.return_value = pb.GetInstanceResponse(exists=False)
+    hub_client._stub = stub
+    return hub_client
+
+
+def _make_async_client() -> AsyncTaskHubGrpcClient:
+    hub_client = AsyncTaskHubGrpcClient(host_address='localhost:1')
+    stub = AsyncMock()
+    stub.StartInstance.return_value = pb.CreateInstanceResponse(instanceId=INSTANCE_ID)
+    stub.GetInstance.return_value = pb.GetInstanceResponse(exists=False)
+    stub.WaitForInstanceStart.return_value = pb.GetInstanceResponse(exists=False)
+    stub.WaitForInstanceCompletion.return_value = pb.GetInstanceResponse(exists=False)
+    hub_client._stub = stub
+    return hub_client
+
+
+def _sent_request(stub_method):
+    return stub_method.call_args[0][0]
+
+
+def _assert_routed(req):
+    assert req.HasField('router')
+    assert req.router.targetAppID == TARGET_APP_ID
+    assert req.router.HasField('targetAppID')
+    assert req.router.sourceAppID == ''
+    assert not req.router.HasField('targetAppNamespace')
+
+
+def test_new_task_router_none_when_no_app_id():
+    assert new_task_router(None) is None
+
+
+def test_new_task_router_target_app_only():
+    router = new_task_router(TARGET_APP_ID)
+    assert router.targetAppID == TARGET_APP_ID
+    assert not router.HasField('targetAppNamespace')
+    assert router.sourceAppID == ''
+
+
+def test_sync_client_sets_router_when_app_id_given():
+    hub_client = _make_sync_client()
+    stub = hub_client._stub
+
+    hub_client.schedule_new_orchestration('wf', app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.StartInstance))
+
+    hub_client.get_orchestration_state(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.GetInstance))
+
+    hub_client.wait_for_orchestration_start(INSTANCE_ID, timeout=1, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.WaitForInstanceStart))
+
+    hub_client.wait_for_orchestration_completion(INSTANCE_ID, timeout=1, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.WaitForInstanceCompletion))
+
+    hub_client.raise_orchestration_event(INSTANCE_ID, 'event', app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.RaiseEvent))
+
+    hub_client.terminate_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.TerminateInstance))
+
+    hub_client.suspend_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.SuspendInstance))
+
+    hub_client.resume_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.ResumeInstance))
+
+    hub_client.purge_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.PurgeInstances))
+
+
+def test_sync_client_no_router_when_app_id_none():
+    hub_client = _make_sync_client()
+    stub = hub_client._stub
+
+    hub_client.schedule_new_orchestration('wf')
+    assert not _sent_request(stub.StartInstance).HasField('router')
+
+    hub_client.get_orchestration_state(INSTANCE_ID)
+    assert not _sent_request(stub.GetInstance).HasField('router')
+
+    hub_client.wait_for_orchestration_start(INSTANCE_ID, timeout=1)
+    assert not _sent_request(stub.WaitForInstanceStart).HasField('router')
+
+    hub_client.wait_for_orchestration_completion(INSTANCE_ID, timeout=1)
+    assert not _sent_request(stub.WaitForInstanceCompletion).HasField('router')
+
+    hub_client.raise_orchestration_event(INSTANCE_ID, 'event')
+    assert not _sent_request(stub.RaiseEvent).HasField('router')
+
+    hub_client.terminate_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.TerminateInstance).HasField('router')
+
+    hub_client.suspend_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.SuspendInstance).HasField('router')
+
+    hub_client.resume_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.ResumeInstance).HasField('router')
+
+    hub_client.purge_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.PurgeInstances).HasField('router')
+
+
+async def test_async_client_sets_router_when_app_id_given():
+    hub_client = _make_async_client()
+    stub = hub_client._stub
+
+    await hub_client.schedule_new_orchestration('wf', app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.StartInstance))
+
+    await hub_client.get_orchestration_state(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.GetInstance))
+
+    await hub_client.wait_for_orchestration_start(INSTANCE_ID, timeout=1, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.WaitForInstanceStart))
+
+    await hub_client.wait_for_orchestration_completion(INSTANCE_ID, timeout=1, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.WaitForInstanceCompletion))
+
+    await hub_client.raise_orchestration_event(INSTANCE_ID, 'event', app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.RaiseEvent))
+
+    await hub_client.terminate_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.TerminateInstance))
+
+    await hub_client.suspend_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.SuspendInstance))
+
+    await hub_client.resume_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.ResumeInstance))
+
+    await hub_client.purge_orchestration(INSTANCE_ID, app_id=TARGET_APP_ID)
+    _assert_routed(_sent_request(stub.PurgeInstances))
+
+
+async def test_async_client_no_router_when_app_id_none():
+    hub_client = _make_async_client()
+    stub = hub_client._stub
+
+    await hub_client.schedule_new_orchestration('wf')
+    assert not _sent_request(stub.StartInstance).HasField('router')
+
+    await hub_client.get_orchestration_state(INSTANCE_ID)
+    assert not _sent_request(stub.GetInstance).HasField('router')
+
+    await hub_client.wait_for_orchestration_start(INSTANCE_ID, timeout=1)
+    assert not _sent_request(stub.WaitForInstanceStart).HasField('router')
+
+    await hub_client.wait_for_orchestration_completion(INSTANCE_ID, timeout=1)
+    assert not _sent_request(stub.WaitForInstanceCompletion).HasField('router')
+
+    await hub_client.raise_orchestration_event(INSTANCE_ID, 'event')
+    assert not _sent_request(stub.RaiseEvent).HasField('router')
+
+    await hub_client.terminate_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.TerminateInstance).HasField('router')
+
+    await hub_client.suspend_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.SuspendInstance).HasField('router')
+
+    await hub_client.resume_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.ResumeInstance).HasField('router')
+
+    await hub_client.purge_orchestration(INSTANCE_ID)
+    assert not _sent_request(stub.PurgeInstances).HasField('router')
diff --git a/tests/ext/workflow/durabletask/test_orchestration_executor.py b/tests/ext/workflow/durabletask/test_orchestration_executor.py
index cdbbbdee0..d6f164fd4 100644
--- a/tests/ext/workflow/durabletask/test_orchestration_executor.py
+++ b/tests/ext/workflow/durabletask/test_orchestration_executor.py
@@ -246,7 +246,7 @@ def orchestrator(ctx: task.OrchestrationContext, orchestrator_input):
 
 
 def test_schedule_activity_actions_router_without_app_id():
-    """Tests that scheduleTask action contains correct router fields when app_id is specified"""
+    """Tests that the workflow action carries no target app ID when app_id is not specified"""
 
     def dummy_activity(ctx, _):
         pass
@@ -274,12 +274,10 @@ def orchestrator(ctx: task.OrchestrationContext, _):
     action = actions[0]
     assert action.router.sourceAppID == 'source-app'
     assert action.router.targetAppID == ''
-    assert action.scheduleTask.router.sourceAppID == 'source-app'
-    assert action.scheduleTask.router.targetAppID == ''
 
 
 def test_schedule_activity_actions_router_with_app_id():
-    """Tests that scheduleTask action contains correct router fields when app_id is specified"""
+    """Tests that the workflow action carries correct router fields when app_id is specified"""
 
     def dummy_activity(ctx, _):
         pass
@@ -307,8 +305,6 @@ def orchestrator(ctx: task.OrchestrationContext, _):
     action = actions[0]
     assert action.router.sourceAppID == 'source-app'
     assert action.router.targetAppID == 'target-app'
-    assert action.scheduleTask.router.sourceAppID == 'source-app'
-    assert action.scheduleTask.router.targetAppID == 'target-app'
 
 
 def test_activity_task_completion():
@@ -771,7 +767,7 @@ def orchestrator(ctx: task.OrchestrationContext, _):
 
 
 def test_create_sub_orchestration_actions_router_without_app_id():
-    """Tests that createChildWorkflow action contains correct router fields when app_id is specified"""
+    """Tests that the workflow action carries no target app ID when app_id is not specified"""
 
     def suborchestrator(ctx: task.OrchestrationContext, _):
         pass
@@ -801,12 +797,10 @@ def orchestrator(ctx: task.OrchestrationContext, _):
     action = actions[0]
     assert action.router.sourceAppID == 'source-app'
     assert action.router.targetAppID == ''
-    assert action.createChildWorkflow.router.sourceAppID == 'source-app'
-    assert action.createChildWorkflow.router.targetAppID == ''
 
 
 def test_create_sub_orchestration_actions_router_with_app_id():
-    """Tests that createChildWorkflow action contains correct router fields when app_id is specified"""
+    """Tests that the workflow action carries correct router fields when app_id is specified"""
 
     def suborchestrator(ctx: task.OrchestrationContext, _):
         pass
@@ -836,8 +830,6 @@ def orchestrator(ctx: task.OrchestrationContext, _):
     action = actions[0]
     assert action.router.sourceAppID == 'source-app'
     assert action.router.targetAppID == 'target-app'
-    assert action.createChildWorkflow.router.sourceAppID == 'source-app'
-    assert action.createChildWorkflow.router.targetAppID == 'target-app'
 
 
 def test_sub_orchestration_task_failed():
diff --git a/tests/ext/workflow/test_workflow_client.py b/tests/ext/workflow/test_workflow_client.py
index 257e72b35..c19eb6a74 100644
--- a/tests/ext/workflow/test_workflow_client.py
+++ b/tests/ext/workflow/test_workflow_client.py
@@ -51,6 +51,10 @@ def details(self):
 class FakeTaskHubGrpcClient:
     def __init__(self):
         self.last_scheduled_workflow_name = None
+        self.last_app_id = None
+
+    def _record_router(self, app_id):
+        self.last_app_id = app_id
 
     def schedule_new_orchestration(
         self,
@@ -59,11 +63,14 @@ def schedule_new_orchestration(
         instance_id,
         start_at,
         reuse_id_policy: Union[client.WorkflowIdReusePolicy, None] = None,
+        app_id=None,
     ):
         self.last_scheduled_workflow_name = workflow
+        self._record_router(app_id)
         return mock_schedule_result
 
-    def get_orchestration_state(self, instance_id, fetch_payloads):
+    def get_orchestration_state(self, instance_id, fetch_payloads, app_id=None):
+        self._record_router(app_id)
         if wf_status == 'not-found':
             raise SimulatedRpcError(code='UNKNOWN', details='no such instance exists')
         elif wf_status == 'found':
@@ -73,31 +80,48 @@ def get_orchestration_state(self, instance_id, fetch_payloads):
         else:
             raise SimulatedRpcError(code='UNKNOWN', details='unknown error')
 
-    def wait_for_orchestration_start(self, instance_id, fetch_payloads, timeout):
+    def wait_for_orchestration_start(self, instance_id, fetch_payloads, timeout, app_id=None):
+        self._record_router(app_id)
         return self._inner_get_orchestration_state(instance_id, client.OrchestrationStatus.RUNNING)
 
-    def wait_for_orchestration_completion(self, instance_id, fetch_payloads, timeout):
+    def wait_for_orchestration_completion(self, instance_id, fetch_payloads, timeout, app_id=None):
+        self._record_router(app_id)
         return self._inner_get_orchestration_state(
             instance_id, client.OrchestrationStatus.COMPLETED
         )
 
     def raise_orchestration_event(
-        self, instance_id: str, event_name: str, *, data: Union[Any, None] = None
+        self,
+        instance_id: str,
+        event_name: str,
+        *,
+        data: Union[Any, None] = None,
+        app_id=None,
     ):
+        self._record_router(app_id)
         return mock_raise_event_result
 
     def terminate_orchestration(
-        self, instance_id: str, *, output: Union[Any, None] = None, recursive: bool = True
+        self,
+        instance_id: str,
+        *,
+        output: Union[Any, None] = None,
+        recursive: bool = True,
+        app_id=None,
     ):
+        self._record_router(app_id)
         return mock_terminate_result
 
-    def suspend_orchestration(self, instance_id: str):
+    def suspend_orchestration(self, instance_id: str, *, app_id=None):
+        self._record_router(app_id)
         return mock_suspend_result
 
-    def resume_orchestration(self, instance_id: str):
+    def resume_orchestration(self, instance_id: str, *, app_id=None):
+        self._record_router(app_id)
         return mock_resume_result
 
-    def purge_orchestration(self, instance_id: str, recursive: bool = True):
+    def purge_orchestration(self, instance_id: str, recursive: bool = True, *, app_id=None):
+        self._record_router(app_id)
         return mock_purge_result
 
     def _inner_get_orchestration_state(self, instance_id, state: client.OrchestrationStatus):
@@ -289,3 +313,60 @@ def test_client_functions(self):
             assert actual_purge_result == mock_purge_result
             actual_purge_result = wfClient.purge_workflow(instance_id=mock_instance_id)
             assert actual_purge_result == mock_purge_result
+
+
+class WorkflowClientCrossAppTest(unittest.TestCase):
+    """Verifies app_id is forwarded to the underlying task hub client."""
+
+    target_app_id = 'appB'
+
+    def _assert_forwarded(self, fake_client):
+        assert fake_client.last_app_id == self.target_app_id
+
+    def test_cross_app_kwargs_are_forwarded(self):
+        fake_client = FakeTaskHubGrpcClient()
+        with mock.patch(
+            'dapr.ext.workflow._durabletask.client.TaskHubGrpcClient', return_value=fake_client
+        ):
+            wfClient = DaprWorkflowClient()
+            routing = {'app_id': self.target_app_id}
+
+            wfClient.schedule_new_workflow(workflow='my_registered_workflow', **routing)
+            self._assert_forwarded(fake_client)
+
+            global wf_status
+            wf_status = 'found'
+            wfClient.get_workflow_state(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            wfClient.wait_for_workflow_start(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            wfClient.wait_for_workflow_completion(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            wfClient.raise_workflow_event(
+                instance_id=mock_instance_id, event_name='test_event', **routing
+            )
+            self._assert_forwarded(fake_client)
+
+            wfClient.terminate_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            wfClient.pause_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            wfClient.resume_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            wfClient.purge_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+    def test_cross_app_kwargs_default_to_none(self):
+        fake_client = FakeTaskHubGrpcClient()
+        with mock.patch(
+            'dapr.ext.workflow._durabletask.client.TaskHubGrpcClient', return_value=fake_client
+        ):
+            wfClient = DaprWorkflowClient()
+            wfClient.terminate_workflow(instance_id=mock_instance_id)
+            assert fake_client.last_app_id is None
diff --git a/tests/ext/workflow/test_workflow_client_aio.py b/tests/ext/workflow/test_workflow_client_aio.py
index 6bdf2d5be..b0e50ba45 100644
--- a/tests/ext/workflow/test_workflow_client_aio.py
+++ b/tests/ext/workflow/test_workflow_client_aio.py
@@ -51,6 +51,10 @@ def details(self):
 class FakeAsyncTaskHubGrpcClient:
     def __init__(self):
         self.last_scheduled_workflow_name = None
+        self.last_app_id = None
+
+    def _record_router(self, app_id):
+        self.last_app_id = app_id
 
     async def schedule_new_orchestration(
         self,
@@ -60,11 +64,14 @@ async def schedule_new_orchestration(
         instance_id,
         start_at,
         reuse_id_policy: Union[client.WorkflowIdReusePolicy, None] = None,
+        app_id=None,
     ):
         self.last_scheduled_workflow_name = workflow
+        self._record_router(app_id)
         return mock_schedule_result
 
-    async def get_orchestration_state(self, instance_id, *, fetch_payloads):
+    async def get_orchestration_state(self, instance_id, *, fetch_payloads, app_id=None):
+        self._record_router(app_id)
         if wf_status == 'not-found':
             raise SimulatedAioRpcError(code='UNKNOWN', details='no such instance exists')
         elif wf_status == 'found':
@@ -74,31 +81,52 @@ async def get_orchestration_state(self, instance_id, *, fetch_payloads):
         else:
             raise SimulatedAioRpcError(code='UNKNOWN', details='unknown error')
 
-    async def wait_for_orchestration_start(self, instance_id, *, fetch_payloads, timeout):
+    async def wait_for_orchestration_start(
+        self, instance_id, *, fetch_payloads, timeout, app_id=None
+    ):
+        self._record_router(app_id)
         return self._inner_get_orchestration_state(instance_id, client.OrchestrationStatus.RUNNING)
 
-    async def wait_for_orchestration_completion(self, instance_id, *, fetch_payloads, timeout):
+    async def wait_for_orchestration_completion(
+        self, instance_id, *, fetch_payloads, timeout, app_id=None
+    ):
+        self._record_router(app_id)
         return self._inner_get_orchestration_state(
             instance_id, client.OrchestrationStatus.COMPLETED
         )
 
     async def raise_orchestration_event(
-        self, instance_id: str, event_name: str, *, data: Union[Any, None] = None
+        self,
+        instance_id: str,
+        event_name: str,
+        *,
+        data: Union[Any, None] = None,
+        app_id=None,
     ):
+        self._record_router(app_id)
         return mock_raise_event_result
 
     async def terminate_orchestration(
-        self, instance_id: str, *, output: Union[Any, None] = None, recursive: bool = True
+        self,
+        instance_id: str,
+        *,
+        output: Union[Any, None] = None,
+        recursive: bool = True,
+        app_id=None,
     ):
+        self._record_router(app_id)
         return mock_terminate_result
 
-    async def suspend_orchestration(self, instance_id: str):
+    async def suspend_orchestration(self, instance_id: str, *, app_id=None):
+        self._record_router(app_id)
         return mock_suspend_result
 
-    async def resume_orchestration(self, instance_id: str):
+    async def resume_orchestration(self, instance_id: str, *, app_id=None):
+        self._record_router(app_id)
         return mock_resume_result
 
-    async def purge_orchestration(self, instance_id: str, recursive: bool = True):
+    async def purge_orchestration(self, instance_id: str, recursive: bool = True, *, app_id=None):
+        self._record_router(app_id)
         return mock_purge_result
 
     def _inner_get_orchestration_state(self, instance_id, state: client.OrchestrationStatus):
@@ -295,3 +323,62 @@ async def test_client_functions(self):
             assert actual_purge_result == mock_purge_result
             actual_purge_result = await wfClient.purge_workflow(instance_id=mock_instance_id)
             assert actual_purge_result == mock_purge_result
+
+
+class WorkflowClientAioCrossAppTest(unittest.IsolatedAsyncioTestCase):
+    """Verifies app_id is forwarded to the underlying async task hub client."""
+
+    target_app_id = 'appB'
+
+    def _assert_forwarded(self, fake_client):
+        assert fake_client.last_app_id == self.target_app_id
+
+    async def test_cross_app_kwargs_are_forwarded(self):
+        fake_client = FakeAsyncTaskHubGrpcClient()
+        with mock.patch(
+            'dapr.ext.workflow._durabletask.aio.client.AsyncTaskHubGrpcClient',
+            return_value=fake_client,
+        ):
+            wfClient = DaprWorkflowClient()
+            routing = {'app_id': self.target_app_id}
+
+            await wfClient.schedule_new_workflow(workflow='my_registered_workflow', **routing)
+            self._assert_forwarded(fake_client)
+
+            global wf_status
+            wf_status = 'found'
+            await wfClient.get_workflow_state(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            await wfClient.wait_for_workflow_start(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            await wfClient.wait_for_workflow_completion(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            await wfClient.raise_workflow_event(
+                instance_id=mock_instance_id, event_name='test_event', **routing
+            )
+            self._assert_forwarded(fake_client)
+
+            await wfClient.terminate_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            await wfClient.pause_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            await wfClient.resume_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+            await wfClient.purge_workflow(instance_id=mock_instance_id, **routing)
+            self._assert_forwarded(fake_client)
+
+    async def test_cross_app_kwargs_default_to_none(self):
+        fake_client = FakeAsyncTaskHubGrpcClient()
+        with mock.patch(
+            'dapr.ext.workflow._durabletask.aio.client.AsyncTaskHubGrpcClient',
+            return_value=fake_client,
+        ):
+            wfClient = DaprWorkflowClient()
+            await wfClient.terminate_workflow(instance_id=mock_instance_id)
+            assert fake_client.last_app_id is None
diff --git a/tests/integration/apps/workflow_host.py b/tests/integration/apps/workflow_host.py
new file mode 100644
index 000000000..57fa495db
--- /dev/null
+++ b/tests/integration/apps/workflow_host.py
@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+
+"""
+Copyright 2026 The Dapr Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Workflow host for cross-app integration tests.
+
+Registers a workflow that blocks on an external event so that every
+client-level operation (get, pause, resume, raise event, terminate, purge) is
+observable against a running instance. The runtime dials out to its sidecar
+over gRPC, so unlike the actor and pubsub hosts this app serves no app channel
+and daprd is started without an --app-port.
+"""
+
+import signal
+import threading
+from typing import Any
+
+from dapr.ext.workflow import DaprWorkflowContext, WorkflowRuntime
+
+WORKFLOW_NAME = 'CrossAppWaitForEvent'
+EVENT_NAME = 'Finish'
+
+
+def wait_for_event_workflow(ctx: DaprWorkflowContext, wf_input: Any) -> Any:
+    """Blocks until EVENT_NAME arrives, then returns its payload."""
+    payload = yield ctx.wait_for_external_event(EVENT_NAME)
+    return payload
+
+
+def main() -> None:
+    runtime = WorkflowRuntime()
+    runtime.register_workflow(wait_for_event_workflow, name=WORKFLOW_NAME)
+    runtime.start()
+
+    # The test drives everything through the sidecar, so this process just has
+    # to stay alive until it is torn down with the sidecar's process group.
+    stop = threading.Event()
+    signal.signal(signal.SIGTERM, lambda *_: stop.set())
+    signal.signal(signal.SIGINT, lambda *_: stop.set())
+    try:
+        stop.wait()
+    finally:
+        runtime.shutdown()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 3ea3c7eb1..28e790be2 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -109,9 +109,12 @@ def start_sidecar(
         self.clients.append(client)
 
         # /healthz/outbound (polled by DaprClient) only checks sidecar-side
-        # readiness. When we launched an app alongside the sidecar, also wait
-        # for /v1.0/healthz so invoke_method et al. don't race the app's server.
-        if app_cmd is not None:
+        # readiness. When the app serves an app channel, also wait for
+        # /v1.0/healthz so invoke_method et al. don't race the app's server.
+        # Keyed on app_port rather than app_cmd because some apps (workflow
+        # workers) dial out to the sidecar instead of listening, so they have
+        # no app channel for /v1.0/healthz to probe.
+        if app_port is not None:
             _wait_for_app_health(http_port)
 
         return client
diff --git a/tests/integration/test_workflow_cross_app.py b/tests/integration/test_workflow_cross_app.py
new file mode 100644
index 000000000..47a5710e6
--- /dev/null
+++ b/tests/integration/test_workflow_cross_app.py
@@ -0,0 +1,170 @@
+# -*- coding: utf-8 -*-
+
+"""
+Copyright 2026 The Dapr Authors
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+End-to-end tests for cross-app workflow client operations.
+
+Two sidecars are started: a host app that registers the workflow, and a caller
+app that registers nothing. Every operation is issued from the caller's
+DaprWorkflowClient with app_id pointing at the host, proving the target app ID
+travels on the wire and the runtime routes to the owning app.
+
+Requires a daprd that supports cross-app workflow operations; against an older
+runtime the app_id is ignored and the caller would act on its own app.
+"""
+
+import time
+
+import pytest
+
+from dapr.ext.workflow import DaprWorkflowClient
+from tests.integration.apps.workflow_host import EVENT_NAME, WORKFLOW_NAME
+
+pytestmark = pytest.mark.dapr_head
+
+HOST_APP_ID = 'wf-cross-app-host'
+HOST_GRPC_PORT = 13541
+HOST_HTTP_PORT = 3541
+HOST_INTERNAL_GRPC_PORT = 13542
+HOST_METRICS_PORT = 9141
+
+CALLER_APP_ID = 'wf-cross-app-caller'
+CALLER_GRPC_PORT = 13551
+CALLER_HTTP_PORT = 3551
+CALLER_INTERNAL_GRPC_PORT = 13552
+CALLER_METRICS_PORT = 9151
+
+WORKFLOW_READY_TIMEOUT = 30
+STATUS_TIMEOUT = 30
+
+
+@pytest.fixture(scope='module', autouse=True)
+def sidecars(dapr_env, apps_dir):
+    """Starts the workflow host app and a caller app with its own sidecar."""
+    dapr_env.start_sidecar(
+        app_id=HOST_APP_ID,
+        grpc_port=HOST_GRPC_PORT,
+        http_port=HOST_HTTP_PORT,
+        internal_grpc_port=HOST_INTERNAL_GRPC_PORT,
+        metrics_port=HOST_METRICS_PORT,
+        app_cmd=f'python3 {apps_dir / "workflow_host.py"}',
+    )
+    dapr_env.start_sidecar(
+        app_id=CALLER_APP_ID,
+        grpc_port=CALLER_GRPC_PORT,
+        http_port=CALLER_HTTP_PORT,
+        internal_grpc_port=CALLER_INTERNAL_GRPC_PORT,
+        metrics_port=CALLER_METRICS_PORT,
+    )
+
+
+@pytest.fixture(scope='module')
+def caller_client():
+    """A workflow client bound to the caller sidecar, which hosts no workflows."""
+    client = DaprWorkflowClient(port=str(CALLER_GRPC_PORT))
+    try:
+        yield client
+    finally:
+        client.close()
+
+
+@pytest.fixture(scope='module')
+def host_client():
+    """A workflow client bound to the host sidecar, used only to corroborate state."""
+    client = DaprWorkflowClient(port=str(HOST_GRPC_PORT))
+    try:
+        yield client
+    finally:
+        client.close()
+
+
+def _schedule_on_host(caller_client: DaprWorkflowClient) -> str:
+    """Schedules the host's workflow from the caller and waits for it to run.
+
+    The host worker registers its workflow asynchronously after its sidecar
+    reports ready, so scheduling is retried until the host has it.
+    """
+    deadline = time.monotonic() + WORKFLOW_READY_TIMEOUT
+    last_error: Exception | None = None
+    while time.monotonic() < deadline:
+        try:
+            instance_id = caller_client.schedule_new_workflow(
+                workflow=WORKFLOW_NAME, app_id=HOST_APP_ID
+            )
+            state = caller_client.wait_for_workflow_start(
+                instance_id, app_id=HOST_APP_ID, timeout_in_seconds=10
+            )
+            if state is not None:
+                return instance_id
+        except Exception as exc:  # noqa: BLE001 - retried until the host is up
+            last_error = exc
+        time.sleep(0.5)
+    raise AssertionError(f'host app never accepted a cross-app schedule: {last_error}')
+
+
+def _wait_for_status(client: DaprWorkflowClient, instance_id: str, expected: str) -> None:
+    deadline = time.monotonic() + STATUS_TIMEOUT
+    seen = None
+    while time.monotonic() < deadline:
+        state = client.get_workflow_state(instance_id, app_id=HOST_APP_ID)
+        seen = None if state is None else state.runtime_status.name
+        if seen == expected:
+            return
+        time.sleep(0.2)
+    raise AssertionError(f'expected status {expected}, last saw {seen}')
+
+
+def test_cross_app_schedule_targets_the_host_app(caller_client, host_client):
+    """A workflow scheduled with app_id runs on the host, not on the caller."""
+    instance_id = _schedule_on_host(caller_client)
+
+    hosted = host_client.get_workflow_state(instance_id)
+    assert hosted is not None
+    assert hosted.name == WORKFLOW_NAME
+
+    local_to_caller = caller_client.get_workflow_state(instance_id)
+    assert local_to_caller is None
+
+
+def test_cross_app_pause_and_resume(caller_client):
+    """Pause and resume drive the remote instance through SUSPENDED and back."""
+    instance_id = _schedule_on_host(caller_client)
+
+    caller_client.pause_workflow(instance_id, app_id=HOST_APP_ID)
+    _wait_for_status(caller_client, instance_id, 'SUSPENDED')
+
+    caller_client.resume_workflow(instance_id, app_id=HOST_APP_ID)
+    _wait_for_status(caller_client, instance_id, 'RUNNING')
+
+
+def test_cross_app_raise_event_completes_and_purge_removes(caller_client, host_client):
+    """Raising the awaited event completes the remote workflow, then purge deletes it."""
+    instance_id = _schedule_on_host(caller_client)
+
+    caller_client.raise_workflow_event(instance_id, EVENT_NAME, data='finished', app_id=HOST_APP_ID)
+    state = caller_client.wait_for_workflow_completion(
+        instance_id, app_id=HOST_APP_ID, timeout_in_seconds=STATUS_TIMEOUT
+    )
+    assert state is not None
+    assert state.runtime_status.name == 'COMPLETED'
+
+    caller_client.purge_workflow(instance_id, app_id=HOST_APP_ID)
+    assert host_client.get_workflow_state(instance_id) is None
+
+
+def test_cross_app_terminate(caller_client):
+    """Terminate stops the remote instance."""
+    instance_id = _schedule_on_host(caller_client)
+
+    caller_client.terminate_workflow(instance_id, app_id=HOST_APP_ID)
+    _wait_for_status(caller_client, instance_id, 'TERMINATED')
diff --git a/tools/regen_durabletask_protos.sh b/tools/regen_durabletask_protos.sh
index 4b9120f11..20b048eb1 100755
--- a/tools/regen_durabletask_protos.sh
+++ b/tools/regen_durabletask_protos.sh
@@ -15,7 +15,8 @@
 
 # Regenerate Python protobuf/gRPC stubs for the vendored durabletask package.
 #
-# Proto source files are fetched from the durabletask-protobuf repository.
+# Proto source files are fetched from the durabletask-protobuf repository, or
+# taken from a local checkout when DURABLETASK_PROTOBUF_DIR is set.
 # Generated output goes to dapr/ext/workflow/_durabletask/internal/
 #
 # Prerequisites: uv sync --all-extras --group dev
@@ -23,43 +24,78 @@
 # Usage:
 #   ./tools/regen_durabletask_protos.sh
 #   DURABLETASK_PROTOBUF_BRANCH=v1.2.3 ./tools/regen_durabletask_protos.sh
+#   DURABLETASK_PROTOBUF_DIR=/path/to/durabletask-protobuf ./tools/regen_durabletask_protos.sh
 
 set -euo pipefail
 
 DURABLETASK_PROTOBUF_BRANCH=${DURABLETASK_PROTOBUF_BRANCH:-main}
+DURABLETASK_PROTOBUF_DIR=${DURABLETASK_PROTOBUF_DIR:-}
+proto_source_commit=""
 REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 OUTPUT_DIR="${REPO_ROOT}/dapr/ext/workflow/_durabletask/internal"
 PYTHON_PACKAGE="dapr.ext.workflow._durabletask.internal"
 
-if type "curl" > /dev/null 2>&1; then
-    HTTP_REQUEST_CLI=curl
-elif type "wget" > /dev/null 2>&1; then
-    HTTP_REQUEST_CLI=wget
+if [ -n "$DURABLETASK_PROTOBUF_DIR" ]; then
+    if [ ! -d "${DURABLETASK_PROTOBUF_DIR}/protos" ]; then
+        echo "Error: ${DURABLETASK_PROTOBUF_DIR}/protos does not exist"
+        exit 1
+    fi
+    echo "Using local durabletask-protobuf checkout at ${DURABLETASK_PROTOBUF_DIR}"
+    proto_dir="${DURABLETASK_PROTOBUF_DIR}/protos"
+
+    # The recorded commit is only meaningful if the protos it names are the ones
+    # actually fed to protoc. Uncommitted or untracked proto changes would be
+    # baked into the stubs while PROTO_SOURCE_COMMIT_HASH pointed at HEAD, so the
+    # provenance would be a lie. Refuse instead: commit the proto change (or push
+    # it upstream) and rerun.
+    if [ -n "$(git -C "${DURABLETASK_PROTOBUF_DIR}" status --porcelain -- protos 2>/dev/null)" ]; then
+        echo "Error: ${DURABLETASK_PROTOBUF_DIR}/protos has uncommitted or untracked changes."
+        echo "The generated stubs would not match the commit recorded in PROTO_SOURCE_COMMIT_HASH."
+        git -C "${DURABLETASK_PROTOBUF_DIR}" status --short -- protos
+        exit 1
+    fi
+
+    proto_source_commit="$(git -C "${DURABLETASK_PROTOBUF_DIR}" rev-parse HEAD 2>/dev/null || true)"
 else
-    echo "Either curl or wget is required"
-    exit 1
-fi
+    if type "curl" > /dev/null 2>&1; then
+        HTTP_REQUEST_CLI=curl
+    elif type "wget" > /dev/null 2>&1; then
+        HTTP_REQUEST_CLI=wget
+    else
+        echo "Either curl or wget is required"
+        exit 1
+    fi
 
-tmp="$(mktemp -d)"
-trap 'rm -rf "$tmp"' EXIT
+    tmp="$(mktemp -d)"
+    trap 'rm -rf "$tmp"' EXIT
 
-url="https://github.com/dapr/durabletask-protobuf/archive/refs/heads/${DURABLETASK_PROTOBUF_BRANCH}.tar.gz"
+    url="https://github.com/dapr/durabletask-protobuf/archive/refs/heads/${DURABLETASK_PROTOBUF_BRANCH}.tar.gz"
 
-echo "Downloading durabletask-protobuf from ${url}..."
-pushd "$tmp" > /dev/null
-if [ "$HTTP_REQUEST_CLI" == "curl" ]; then
-    curl -SsL "$url" -o - | tar --strip-components=1 -xzf -
-else
-    wget -q -O - "$url" | tar --strip-components=1 -xzf -
+    echo "Downloading durabletask-protobuf from ${url}..."
+    pushd "$tmp" > /dev/null
+    if [ "$HTTP_REQUEST_CLI" == "curl" ]; then
+        curl -SsL "$url" -o - | tar --strip-components=1 -xzf -
+    else
+        wget -q -O - "$url" | tar --strip-components=1 -xzf -
+    fi
+    popd > /dev/null
+
+    proto_dir="${tmp}/protos"
+
+    # The tarball carries no git metadata, so resolve the branch head via the API.
+    api_url="https://api.github.com/repos/dapr/durabletask-protobuf/commits/${DURABLETASK_PROTOBUF_BRANCH}"
+    if [ "$HTTP_REQUEST_CLI" == "curl" ]; then
+        proto_source_commit="$(curl -SsL -H 'Accept: application/vnd.github.sha' "$api_url" 2>/dev/null || true)"
+    else
+        proto_source_commit="$(wget -q -O - --header='Accept: application/vnd.github.sha' "$api_url" 2>/dev/null || true)"
+    fi
 fi
-popd > /dev/null
 
 # The .proto files live under protos/ in durabletask-protobuf and use bare
 # imports like: import "orchestration.proto"
 #
 # We use the protos directory as the single --proto_path so that bare imports
 # resolve correctly. Generated files land directly in the output directory.
-proto_dir="${tmp}/protos"
 
 proto_files=()
 while IFS= read -r -d '' file; do
@@ -129,5 +165,15 @@ for f in "${OUTPUT_DIR}"/*_pb2.py; do
     fi
 done
 
+# Record which durabletask-protobuf commit produced these stubs. Without this
+# the file is edited by hand and silently drifts from the generated code.
+if [ -n "$proto_source_commit" ]; then
+    echo "$proto_source_commit" > "${OUTPUT_DIR}/PROTO_SOURCE_COMMIT_HASH"
+    echo "Recorded source commit ${proto_source_commit}"
+else
+    echo "Warning: could not resolve the durabletask-protobuf commit;" \
+         "update ${OUTPUT_DIR}/PROTO_SOURCE_COMMIT_HASH by hand"
+fi
+
 echo -e "\nDurableTask protobuf/gRPC stubs regenerated successfully!"
 echo "Output: ${OUTPUT_DIR}"