diff --git a/api/core/entities/parameter_entities.py b/api/core/entities/parameter_entities.py
index 36800bc263..2d3fb9e833 100644
--- a/api/core/entities/parameter_entities.py
+++ b/api/core/entities/parameter_entities.py
@@ -16,6 +16,9 @@ class CommonParameterType(StrEnum):
     TOOLS_SELECTOR = "array[tools]"
 
     # TOOL_SELECTOR = "tool-selector"
+    # MCP object and array type parameters
+    ARRAY = "array"
+    OBJECT = "object"
 
 
 class AppSelectorScope(StrEnum):
diff --git a/api/core/plugin/entities/parameters.py b/api/core/plugin/entities/parameters.py
index a323104295..b663f66f5b 100644
--- a/api/core/plugin/entities/parameters.py
+++ b/api/core/plugin/entities/parameters.py
@@ -39,6 +39,10 @@ class PluginParameterType(enum.StrEnum):
     # deprecated, should not use.
     SYSTEM_FILES = CommonParameterType.SYSTEM_FILES.value
 
+    # MCP object and array type parameters
+    ARRAY = CommonParameterType.ARRAY.value
+    OBJECT = CommonParameterType.OBJECT.value
+
 
 class MCPServerParameterType(enum.StrEnum):
     """
@@ -143,6 +147,14 @@ def cast_parameter_value(typ: enum.StrEnum, value: Any, /):
                 if value and not isinstance(value, list):
                     raise ValueError("The tools selector must be a list.")
                 return value
+            case PluginParameterType.ARRAY:
+                if not isinstance(value, list):
+                    return [value]
+                return value
+            case PluginParameterType.OBJECT:
+                if not isinstance(value, dict):
+                    return {}
+                return value
             case _:
                 return str(value)
     except ValueError:
diff --git a/api/core/tools/mcp_tool/tool.py b/api/core/tools/mcp_tool/tool.py
index a2c5e159c6..dcd1bf89d9 100644
--- a/api/core/tools/mcp_tool/tool.py
+++ b/api/core/tools/mcp_tool/tool.py
@@ -4,7 +4,6 @@ from typing import Any, Optional
 from core.mcp.error import MCPAuthError, MCPConnectionError
 from core.mcp.mcp_client import MCPClient
 from core.mcp.types import ImageContent, TextContent
-from core.plugin.utils.converter import convert_parameters_to_plugin_format
 from core.tools.__base.tool import Tool
 from core.tools.__base.tool_runtime import ToolRuntime
 from core.tools.entities.tool_entities import ToolEntity, ToolInvokeMessage, ToolParameter, ToolProviderType
@@ -40,7 +39,6 @@ class MCPTool(Tool):
     ) -> Generator[ToolInvokeMessage, None, None]:
         try:
             with MCPClient(self.server_url, self.provider_id, self.tenant_id, authed=True) as mcp_client:
-                tool_parameters = convert_parameters_to_plugin_format(tool_parameters)
                 result = mcp_client.invoke_tool(tool_name=self.entity.identity.name, tool_args=tool_parameters)
         except MCPAuthError as e:
             raise ValueError("Please auth the tool first")