diff --git a/api/core/workflow/nodes/tool/entities.py b/api/core/workflow/nodes/tool/entities.py
index ebaa7a56bd..aec8f34bb9 100644
--- a/api/core/workflow/nodes/tool/entities.py
+++ b/api/core/workflow/nodes/tool/entities.py
@@ -16,8 +16,8 @@ class ToolEntity(BaseModel):
 
 class ToolNodeData(BaseNodeData, ToolEntity):
     class ToolInput(BaseModel):
-        type: Literal['mixed', 'variable', 'constant']
         value: Union[ToolParameterValue, list[str]]
+        type: Literal['mixed', 'variable', 'constant']
 
         @validator('type', pre=True, always=True)
         def check_type(cls, value, values):
@@ -29,7 +29,7 @@ class ToolNodeData(BaseNodeData, ToolEntity):
                 raise ValueError('value must be a list')
             elif typ == 'constant' and not isinstance(value, ToolParameterValue):
                 raise ValueError('value must be a string, int, float, or bool')
-            return value
+            return typ
             
     """
     Tool Node Schema
diff --git a/api/tests/integration_tests/workflow/nodes/test_tool.py b/api/tests/integration_tests/workflow/nodes/test_tool.py
index 43a0185844..e2bc68b767 100644
--- a/api/tests/integration_tests/workflow/nodes/test_tool.py
+++ b/api/tests/integration_tests/workflow/nodes/test_tool.py
@@ -4,7 +4,7 @@ from core.workflow.entities.variable_pool import VariablePool
 from core.workflow.nodes.tool.tool_node import ToolNode
 from models.workflow import WorkflowNodeExecutionStatus
 
-def test_tool_invoke():
+def test_tool_variable_invoke():
     pool = VariablePool(system_variables={}, user_inputs={})
     pool.append_variable(node_id='1', variable_key_list=['123', 'args1'], value='1+1')
 
@@ -25,14 +25,50 @@ def test_tool_invoke():
                 'tool_name': 'eval_expression',
                 'tool_label': 'eval_expression',
                 'tool_configurations': {},
-                'tool_parameters': [
-                    {
-                        'value_type': 'variable',
-                        'static_value': None,
-                        'variable_value': ['1', '123', 'args1'],
-                        'parameter_name': 'expression',
-                    },
-                ]
+                'tool_parameters': {
+                    'expression': {
+                        'type': 'variable',
+                        'value': ['1', '123', 'args1'],
+                    }
+                }
+            }
+        }
+    )
+
+    # execute node
+    result = node.run(pool)
+    
+    assert result.status == WorkflowNodeExecutionStatus.SUCCEEDED
+    assert '2' in result.outputs['text']
+    assert result.outputs['files'] == []
+
+def test_tool_mixed_invoke():
+    pool = VariablePool(system_variables={}, user_inputs={})
+    pool.append_variable(node_id='1', variable_key_list=['args1'], value='1+1')
+
+    node = ToolNode(
+        tenant_id='1',
+        app_id='1',
+        workflow_id='1',
+        user_id='1',
+        user_from=InvokeFrom.WEB_APP,
+        config={
+            'id': '1',
+            'data': {
+                'title': 'a',
+                'desc': 'a',
+                'provider_id': 'maths',
+                'provider_type': 'builtin',
+                'provider_name': 'maths',
+                'tool_name': 'eval_expression',
+                'tool_label': 'eval_expression',
+                'tool_configurations': {},
+                'tool_parameters': {
+                    'expression': {
+                        'type': 'mixed',
+                        'value': '{{#1.args1#}}',
+                    }
+                }
             }
         }
     )