diff --git a/huntflow_api_client/entities/applicants.py b/huntflow_api_client/entities/applicants.py
index 02f1c23..8c0d106 100644
--- a/huntflow_api_client/entities/applicants.py
+++ b/huntflow_api_client/entities/applicants.py
@@ -6,7 +6,7 @@
     GetEntityMixin,
     ListEntityMixin,
 )
-from huntflow_api_client.models.consts import AgreementState, ApplicantSearchField
+from huntflow_api_client.models.consts import AgreementStateRequest, ApplicantSearchField
 from huntflow_api_client.models.request.applicants import (
     ApplicantCreateRequest,
     ApplicantUpdateRequest,
@@ -27,7 +27,7 @@ async def list(
         page: Optional[int] = 1,
         status: Optional[int] = None,
         vacancy_id: Optional[int] = None,
-        agreement_state: Optional[AgreementState] = None,
+        agreement_state: Optional[AgreementStateRequest] = None,
     ) -> ApplicantListResponse:
         """
         API method reference https://api.huntflow.ai/v2/docs#get-/accounts/-account_id-/applicants
diff --git a/huntflow_api_client/models/consts.py b/huntflow_api_client/models/consts.py
index 37bbb36..c89d9ed 100644
--- a/huntflow_api_client/models/consts.py
+++ b/huntflow_api_client/models/consts.py
@@ -1,5 +1,7 @@
 from enum import Enum
 
+from huntflow_api_client.models.utils import extend_enum
+
 
 class WebhookEvent(str, Enum):
     APPLICANT = "APPLICANT"
@@ -69,11 +71,15 @@ class FieldType(str, Enum):
     html = "html"
 
 
-class AgreementState(str, Enum):
+class AgreementStateRequest(str, Enum):
     not_sent = "not_sent"
     sent = "sent"
     accepted = "accepted"
     declined = "declined"
+
+
+@extend_enum(AgreementStateRequest)
+class AgreementStateResponse(str, Enum):
     send_error = "send_error"
 
 
diff --git a/huntflow_api_client/models/response/applicants.py b/huntflow_api_client/models/response/applicants.py
index e4eacc0..a69c7ef 100644
--- a/huntflow_api_client/models/response/applicants.py
+++ b/huntflow_api_client/models/response/applicants.py
@@ -4,7 +4,7 @@
 from pydantic import BaseModel, ConfigDict, EmailStr, Field, PositiveInt
 
 from huntflow_api_client.models.common import Applicant, PaginatedResponse
-from huntflow_api_client.models.consts import AgreementState as AgreementStateEnum
+from huntflow_api_client.models.consts import AgreementStateResponse as AgreementStateEnum
 
 
 class ApplicantTag(BaseModel):
diff --git a/huntflow_api_client/models/utils.py b/huntflow_api_client/models/utils.py
new file mode 100644
index 0000000..150e397
--- /dev/null
+++ b/huntflow_api_client/models/utils.py
@@ -0,0 +1,14 @@
+from enum import Enum
+from typing import Callable, Type
+
+
+def extend_enum(inherited_enum: Type[Enum]) -> Callable:
+    def wrapper(added_enum: Type[Enum]) -> Enum:
+        joined = {}
+        for item in inherited_enum:
+            joined[item.name] = item.value
+        for item in added_enum:
+            joined[item.name] = item.value
+        return Enum(added_enum.__name__, joined)
+
+    return wrapper