diff --git a/azure/durable_functions/models/DurableEntityContext.py b/azure/durable_functions/models/DurableEntityContext.py
index c4c13879..ef91b13f 100644
--- a/azure/durable_functions/models/DurableEntityContext.py
+++ b/azure/durable_functions/models/DurableEntityContext.py
@@ -124,7 +124,9 @@ def set_state(self, state: Any) -> None:
         """
         # TODO: enable serialization of custom types
         self._exists = True
-        self._state = json.dumps(state)
+
+        # should only serialize the state at the end of a batch
+        self._state = state
 
     def get_state(self, initializer: Optional[Callable[[], Any]] = None) -> Any:
         """Get the current state of this entity.
diff --git a/azure/durable_functions/models/DurableOrchestrationContext.py b/azure/durable_functions/models/DurableOrchestrationContext.py
index f2d96186..26dac506 100644
--- a/azure/durable_functions/models/DurableOrchestrationContext.py
+++ b/azure/durable_functions/models/DurableOrchestrationContext.py
@@ -12,7 +12,8 @@
 from .utils.entity_utils import EntityId
 from ..tasks import call_activity_task, task_all, task_any, call_activity_with_retry_task, \
     wait_for_external_event_task, continue_as_new, new_uuid, call_http, create_timer_task, \
-    call_sub_orchestrator_task, call_sub_orchestrator_with_retry_task, call_entity_task
+    call_sub_orchestrator_task, call_sub_orchestrator_with_retry_task, call_entity_task, \
+    signal_entity_task
 from azure.functions._durable_functions import _deserialize_custom_object
 
 
@@ -380,6 +381,26 @@ def call_entity(self, entityId: EntityId,
         """
         return call_entity_task(self.histories, entityId, operationName, operationInput)
 
+    def signal_entity(self, entityId: EntityId,
+                      operationName: str, operationInput: Optional[Any] = None):
+        """Send a signal operation to Durable Entity given some input.
+
+        Parameters
+        ----------
+        entityId: EntityId
+            The ID of the entity to call
+        operationName: str
+            The operation to execute
+        operationInput: Optional[Any]
+            The input for tne operation, defaults to None.
+
+        Returns
+        -------
+        Task
+            A Task of the entity signal
+        """
+        return signal_entity_task(self, self.histories, entityId, operationName, operationInput)
+
     @property
     def will_continue_as_new(self) -> bool:
         """Return true if continue_as_new was called."""
diff --git a/azure/durable_functions/models/actions/ActionType.py b/azure/durable_functions/models/actions/ActionType.py
index 66ffbb63..406c6f86 100644
--- a/azure/durable_functions/models/actions/ActionType.py
+++ b/azure/durable_functions/models/actions/ActionType.py
@@ -13,3 +13,4 @@ class ActionType(IntEnum):
     WAIT_FOR_EXTERNAL_EVENT: int = 6
     CALL_ENTITY = 7
     CALL_HTTP: int = 8
+    SIGNAL_ENTITY: int = 9
diff --git a/azure/durable_functions/models/actions/SignalEntityAction.py b/azure/durable_functions/models/actions/SignalEntityAction.py
new file mode 100644
index 00000000..d6e9be54
--- /dev/null
+++ b/azure/durable_functions/models/actions/SignalEntityAction.py
@@ -0,0 +1,47 @@
+from typing import Any, Dict
+
+from .Action import Action
+from .ActionType import ActionType
+from ..utils.json_utils import add_attrib
+from json import dumps
+from azure.functions._durable_functions import _serialize_custom_object
+from ..utils.entity_utils import EntityId
+
+
+class SignalEntityAction(Action):
+    """Defines the structure of the Signal Entity object.
+
+    Provides the information needed by the durable extension to be able to signal an entity
+    """
+
+    def __init__(self, entity_id: EntityId, operation: str, input_=None):
+        self.entity_id: EntityId = entity_id
+
+        # Validating that EntityId exists before trying to parse its instanceId
+        if not self.entity_id:
+            raise ValueError("entity_id cannot be empty")
+
+        self.instance_id: str = EntityId.get_scheduler_id(entity_id)
+        self.operation: str = operation
+        self.input_: str = dumps(input_, default=_serialize_custom_object)
+
+    @property
+    def action_type(self) -> int:
+        """Get the type of action this class represents."""
+        return ActionType.SIGNAL_ENTITY
+
+    def to_json(self) -> Dict[str, Any]:
+        """Convert object into a json dictionary.
+
+        Returns
+        -------
+        Dict[str, Any]
+            The instance of the class converted into a json dictionary
+        """
+        json_dict: Dict[str, Any] = {}
+        add_attrib(json_dict, self, "action_type", "actionType")
+        add_attrib(json_dict, self, 'instance_id', 'instanceId')
+        add_attrib(json_dict, self, 'operation', 'operation')
+        add_attrib(json_dict, self, 'input_', 'input')
+
+        return json_dict
diff --git a/azure/durable_functions/models/entities/EntityState.py b/azure/durable_functions/models/entities/EntityState.py
index 59fea5ad..e0de6b6e 100644
--- a/azure/durable_functions/models/entities/EntityState.py
+++ b/azure/durable_functions/models/entities/EntityState.py
@@ -55,7 +55,7 @@ def to_json(self) -> Dict[str, Any]:
         serialized_results = list(map(lambda x: x.to_json(), self.results))
 
         json_dict["entityExists"] = self.entity_exists
-        json_dict["entityState"] = self.state
+        json_dict["entityState"] = json.dumps(self.state)
         json_dict["results"] = serialized_results
         json_dict["signals"] = self.signals
         return json_dict
diff --git a/azure/durable_functions/tasks/__init__.py b/azure/durable_functions/tasks/__init__.py
index 82eb8be0..9c7f6e9b 100644
--- a/azure/durable_functions/tasks/__init__.py
+++ b/azure/durable_functions/tasks/__init__.py
@@ -12,6 +12,7 @@
 from .call_http import call_http
 from .create_timer import create_timer_task
 from .call_entity import call_entity_task
+from .signal_entity import signal_entity_task
 
 __all__ = [
     'call_activity_task',
@@ -19,6 +20,7 @@
     'call_sub_orchestrator_task',
     'call_sub_orchestrator_with_retry_task',
     'call_entity_task',
+    'signal_entity_task',
     'call_http',
     'continue_as_new',
     'new_uuid',
diff --git a/azure/durable_functions/tasks/call_entity.py b/azure/durable_functions/tasks/call_entity.py
index 9d22989f..38ecb7cb 100644
--- a/azure/durable_functions/tasks/call_entity.py
+++ b/azure/durable_functions/tasks/call_entity.py
@@ -8,6 +8,7 @@
 from ..models.utils.entity_utils import EntityId
 from ..models.entities.RequestMessage import RequestMessage
 from ..models.entities.ResponseMessage import ResponseMessage
+import json
 
 
 def call_entity_task(
@@ -64,7 +65,12 @@ def call_entity_task(
     if event_raised is not None:
         response = parse_history_event(event_raised)
         response = ResponseMessage.from_dict(response)
-        result = response.result
+
+        # TODO: json.loads inside parse_history_event is not recursvie
+        #       investigate if response.result is used elsewhere,
+        #       which probably requires another deserialization
+        result = json.loads(response.result)
+
         return Task(
             is_completed=True,
             is_faulted=False,
diff --git a/azure/durable_functions/tasks/signal_entity.py b/azure/durable_functions/tasks/signal_entity.py
new file mode 100644
index 00000000..2f17d0ce
--- /dev/null
+++ b/azure/durable_functions/tasks/signal_entity.py
@@ -0,0 +1,46 @@
+from typing import List, Any, Optional
+from ..models.actions.SignalEntityAction import SignalEntityAction
+from ..models.history import HistoryEvent, HistoryEventType
+from .task_utilities import set_processed, find_event
+from ..models.utils.entity_utils import EntityId
+
+
+def signal_entity_task(
+        context,
+        state: List[HistoryEvent],
+        entity_id: EntityId,
+        operation_name: str = "",
+        input_: Optional[Any] = None):
+    """Signal a entity operation.
+
+    It the action hasn't been scheduled, it appends the action.
+    If the action has been scheduled, no ops.
+
+    Parameters
+    ----------
+    state: List[HistoryEvent]
+        The list of history events to search over to determine the
+        current state of the callEntity Task.
+    entity_id: EntityId
+        An identifier for the entity to call.
+    operation_name: str
+        The name of the operation the entity needs to execute.
+    input_: Any
+        The JSON-serializable input to pass to the activity function.
+    """
+    new_action = SignalEntityAction(entity_id, operation_name, input_)
+    scheduler_id = EntityId.get_scheduler_id(entity_id=entity_id)
+
+    hist_type = HistoryEventType.EVENT_SENT
+    extra_constraints = {
+        "InstanceId": scheduler_id,
+        "Name": "op"
+    }
+
+    event_sent = find_event(state, hist_type, extra_constraints)
+    set_processed([event_sent])
+
+    if event_sent:
+        return
+
+    context.actions.append([new_action])
diff --git a/tests/models/test_DurableOrchestrationClient.py b/tests/models/test_DurableOrchestrationClient.py
index 1b97629a..188c52ea 100644
--- a/tests/models/test_DurableOrchestrationClient.py
+++ b/tests/models/test_DurableOrchestrationClient.py
@@ -492,7 +492,7 @@ async def test_wait_or_response_check_status_response(binding_string):
 
 
 @pytest.mark.asyncio
-async def test_wait_or_response_check_status_response(binding_string):
+async def test_wait_or_response_null_request(binding_string):
     status = dict(createdTime=TEST_CREATED_TIME,
                   lastUpdatedTime=TEST_LAST_UPDATED_TIME,
                   runtimeStatus="Running")
diff --git a/tests/orchestrator/test_entity.py b/tests/orchestrator/test_entity.py
index 9878e1ea..ca10723b 100644
--- a/tests/orchestrator/test_entity.py
+++ b/tests/orchestrator/test_entity.py
@@ -4,11 +4,13 @@
 from azure.durable_functions.models.OrchestratorState import OrchestratorState
 from azure.durable_functions.models.actions.CallEntityAction \
     import CallEntityAction
+from azure.durable_functions.models.actions.SignalEntityAction \
+    import SignalEntityAction
 from tests.test_utils.testClasses import SerializableClass
 import azure.durable_functions as df
 from typing import Any
 
-def generator_function(context):
+def generator_function_call_entity(context):
     outputs = []
     entityId = df.EntityId("Counter", "myCounter")
     x = yield context.call_entity(entityId, "add", 3)
@@ -16,15 +18,25 @@ def generator_function(context):
     outputs.append(x)
     return outputs
 
+def generator_function_signal_entity(context):
+    outputs = []
+    entityId = df.EntityId("Counter", "myCounter")
+    context.signal_entity(entityId, "add", 3)
+    x = yield context.call_entity(entityId, "get")
+    
+    outputs.append(x)
+    return outputs
 
 def base_expected_state(output=None) -> OrchestratorState:
     return OrchestratorState(is_done=False, actions=[], output=output)
 
-
 def add_call_entity_action(state: OrchestratorState, id_: df.EntityId, op: str, input_: Any):
     action = CallEntityAction(entity_id=id_, operation=op, input_=input_)
     state.actions.append([action])
 
+def add_signal_entity_action(state: OrchestratorState, id_: df.EntityId, op: str, input_: Any):
+    action = SignalEntityAction(entity_id=id_, operation=op, input_=input_)
+    state.actions.append([action])
 
 def add_call_entity_completed_events(
         context_builder: ContextBuilder, op: str, instance_id=str, input_=None):
@@ -38,7 +50,7 @@ def test_call_entity_sent():
 
     entityId = df.EntityId("Counter", "myCounter")
     result = get_orchestration_state_result(
-        context_builder, generator_function)
+        context_builder, generator_function_call_entity)
 
     expected_state = base_expected_state()
     add_call_entity_action(expected_state, entityId, "add", 3)
@@ -46,14 +58,30 @@ def test_call_entity_sent():
 
     #assert_valid_schema(result)
     assert_orchestration_state_equals(expected, result)
+    
+def test_signal_entity_sent():
+    context_builder = ContextBuilder('test_simple_function')
+
+    entityId = df.EntityId("Counter", "myCounter")
+    result = get_orchestration_state_result(
+        context_builder, generator_function_signal_entity)
+
+    expected_state = base_expected_state()
+    add_signal_entity_action(expected_state, entityId, "add", 3)
+    add_call_entity_action(expected_state, entityId, "get", None)
+    expected = expected_state.to_json()
+
+    #assert_valid_schema(result)
+    assert_orchestration_state_equals(expected, result)
+
 
 def test_call_entity_raised():
     entityId = df.EntityId("Counter", "myCounter")
     context_builder = ContextBuilder('test_simple_function')
-    add_call_entity_completed_events(context_builder, "add", df.EntityId.get_scheduler_id(entityId),3)
+    add_call_entity_completed_events(context_builder, "add", df.EntityId.get_scheduler_id(entityId), 3)
 
     result = get_orchestration_state_result(
-        context_builder, generator_function)
+        context_builder, generator_function_call_entity)
 
     expected_state = base_expected_state(
         [3]
diff --git a/tests/test_utils/ContextBuilder.py b/tests/test_utils/ContextBuilder.py
index 8d7f646f..69b884cd 100644
--- a/tests/test_utils/ContextBuilder.py
+++ b/tests/test_utils/ContextBuilder.py
@@ -120,7 +120,7 @@ def add_event_raised_event(self, name:str, id_: int, input_=None, timestamp=None
         event = self.get_base_event(HistoryEventType.EVENT_RAISED, id_=id_, timestamp=timestamp)
         event.Name = name
         if is_entity:
-            event.Input = json.dumps({ "result": input_ })
+            event.Input = json.dumps({ "result": json.dumps(input_) })
         else:
             event.Input = input_
         # event.timestamp = timestamp