diff --git a/src/promptflow-devkit/promptflow/_sdk/operations/_flow_operations.py b/src/promptflow-devkit/promptflow/_sdk/operations/_flow_operations.py
index 0a1631f009e..daa55132863 100644
--- a/src/promptflow-devkit/promptflow/_sdk/operations/_flow_operations.py
+++ b/src/promptflow-devkit/promptflow/_sdk/operations/_flow_operations.py
@@ -29,7 +29,6 @@
     FLOW_TOOLS_JSON_GEN_TIMEOUT,
     LOCAL_MGMT_DB_PATH,
     SERVE_SAMPLE_JSON_PATH,
-    SignatureValueType,
 )
 from promptflow._sdk._load_functions import load_flow
 from promptflow._sdk._orchestrator import TestSubmitter
@@ -55,7 +54,6 @@
     parse_variant,
 )
 from promptflow._utils.yaml_utils import dump_yaml, load_yaml
-from promptflow.contracts.tool import ValueType
 from promptflow.exceptions import ErrorTarget, UserErrorException
 
 
@@ -1071,11 +1069,12 @@ def _infer_signature(
             raise UserErrorException("Entry must be a function or a class.")
 
         # signature is language irrelevant, so we apply json type system
+        # TODO: enable this mapping after service supports more types
         value_type_map = {
-            ValueType.INT.value: SignatureValueType.INT.value,
-            ValueType.DOUBLE.value: SignatureValueType.NUMBER.value,
-            ValueType.LIST.value: SignatureValueType.ARRAY.value,
-            ValueType.BOOL.value: SignatureValueType.BOOL.value,
+            # ValueType.INT.value: SignatureValueType.INT.value,
+            # ValueType.DOUBLE.value: SignatureValueType.NUMBER.value,
+            # ValueType.LIST.value: SignatureValueType.ARRAY.value,
+            # ValueType.BOOL.value: SignatureValueType.BOOL.value,
         }
         for port_type in ["inputs", "outputs", "init"]:
             if port_type not in flow_meta:
diff --git a/src/promptflow-devkit/promptflow/_sdk/schemas/_flow.py b/src/promptflow-devkit/promptflow/_sdk/schemas/_flow.py
index a50094264fc..c64cf2cc3a3 100644
--- a/src/promptflow-devkit/promptflow/_sdk/schemas/_flow.py
+++ b/src/promptflow-devkit/promptflow/_sdk/schemas/_flow.py
@@ -6,9 +6,10 @@
 
 from promptflow._constants import LANGUAGE_KEY, ConnectionType, FlowLanguage
 from promptflow._proxy import ProxyFactory
-from promptflow._sdk._constants import FlowType, SignatureValueType
+from promptflow._sdk._constants import FlowType
 from promptflow._sdk.schemas._base import PatchedSchemaMeta, YamlFileSchema
 from promptflow._sdk.schemas._fields import NestedField
+from promptflow.contracts.tool import ValueType
 
 
 class FlowInputSchema(metaclass=PatchedSchemaMeta):
@@ -60,11 +61,21 @@ class FlowSchema(BaseFlowSchema):
     node_variants = fields.Dict(keys=fields.Str(), values=fields.Dict())
 
 
+ALLOWED_TYPES = [
+    ValueType.STRING.value,
+    ValueType.INT.value,
+    ValueType.DOUBLE.value,
+    ValueType.BOOL.value,
+    ValueType.LIST.value,
+    ValueType.OBJECT.value,
+]
+
+
 class FlexFlowInputSchema(FlowInputSchema):
     type = fields.Str(
         required=True,
         # TODO 3062609: Flex flow GPT-V support
-        validate=validate.OneOf(list(map(lambda x: x.value, SignatureValueType))),
+        validate=validate.OneOf(ALLOWED_TYPES),
     )
 
 
@@ -72,7 +83,7 @@ class FlexFlowInitSchema(FlowInputSchema):
     type = fields.Str(
         required=True,
         validate=validate.OneOf(
-            list(map(lambda x: x.value, SignatureValueType))
+            ALLOWED_TYPES
             + list(
                 map(lambda x: f"{x.value}Connection", filter(lambda x: x != ConnectionType._NOT_SET, ConnectionType))
             )
@@ -83,7 +94,7 @@ class FlexFlowInitSchema(FlowInputSchema):
 class FlexFlowOutputSchema(FlowOutputSchema):
     type = fields.Str(
         required=True,
-        validate=validate.OneOf(list(map(lambda x: x.value, SignatureValueType))),
+        validate=validate.OneOf(ALLOWED_TYPES),
     )
 
 
diff --git a/src/promptflow-devkit/tests/sdk_cli_test/e2etests/test_flow_save.py b/src/promptflow-devkit/tests/sdk_cli_test/e2etests/test_flow_save.py
index 6121adaa41b..e5d53877147 100644
--- a/src/promptflow-devkit/tests/sdk_cli_test/e2etests/test_flow_save.py
+++ b/src/promptflow-devkit/tests/sdk_cli_test/e2etests/test_flow_save.py
@@ -70,7 +70,11 @@ def global_hello_int_return(text: str) -> int:
 
 
 def global_hello_strong_return(text: str) -> GlobalHello:
-    return len(text)
+    return GlobalHello(AzureOpenAIConnection("test"))
+
+
+def global_hello_kwargs(text: str, **kwargs) -> str:
+    return f"Hello {text}!"
 
 
 @pytest.mark.usefixtures(
@@ -162,7 +166,7 @@ class TestFlowSave:
                             "type": "string",
                         },
                         "length": {
-                            "type": "integer",
+                            "type": "int",
                         },
                     },
                 },
@@ -200,16 +204,16 @@ class TestFlowSave:
                             "type": "string",
                         },
                         "i": {
-                            "type": "integer",
+                            "type": "int",
                         },
                         "f": {
-                            "type": "number",
+                            "type": "double",
                         },
                         "b": {
-                            "type": "boolean",
+                            "type": "bool",
                         },
                         "li": {
-                            "type": "array",
+                            "type": "list",
                         },
                         "d": {
                             "type": "object",
@@ -220,16 +224,16 @@ class TestFlowSave:
                             "type": "string",
                         },
                         "i": {
-                            "type": "integer",
+                            "type": "int",
                         },
                         "f": {
-                            "type": "number",
+                            "type": "double",
                         },
                         "b": {
-                            "type": "boolean",
+                            "type": "bool",
                         },
                         "li": {
-                            "type": "array",
+                            "type": "list",
                         },
                         "d": {
                             "type": "object",
@@ -240,16 +244,16 @@ class TestFlowSave:
                             "type": "string",
                         },
                         "i": {
-                            "type": "integer",
+                            "type": "int",
                         },
                         "f": {
-                            "type": "number",
+                            "type": "double",
                         },
                         "b": {
-                            "type": "boolean",
+                            "type": "bool",
                         },
                         "l": {
-                            "type": "array",
+                            "type": "list",
                         },
                         "d": {
                             "type": "object",
@@ -490,6 +494,17 @@ def test_pf_save_callable_function(self):
                 },
                 id="inherited_typed_dict_output",
             ),
+            pytest.param(
+                global_hello_kwargs,
+                {
+                    "inputs": {
+                        "text": {
+                            "type": "string",
+                        }
+                    },
+                },
+                id="kwargs",
+            ),
         ],
     )
     def test_infer_signature(