feat: handle none value in mcp tool node

api/core/plugin/entities/parameters.py

@@ -149,10 +149,30 @@ def cast_parameter_value(typ: enum.StrEnum, value: Any, /):
                 return value
             case PluginParameterType.ARRAY:
                 if not isinstance(value, list):
+                    # Try to parse JSON string for arrays
+                    if isinstance(value, str):
+                        try:
+                            import json
+
+                            parsed_value = json.loads(value)
+                            if isinstance(parsed_value, list):
+                                return parsed_value
+                        except (json.JSONDecodeError, ValueError):
+                            pass
                     return [value]
                 return value
             case PluginParameterType.OBJECT:
                 if not isinstance(value, dict):
+                    # Try to parse JSON string for objects
+                    if isinstance(value, str):
+                        try:
+                            import json
+
+                            parsed_value = json.loads(value)
+                            if isinstance(parsed_value, dict):
+                                return parsed_value
+                        except (json.JSONDecodeError, ValueError):
+                            pass
                     return {}
                 return value
             case _:

api/core/tools/mcp_tool/tool.py

@@ -40,6 +40,7 @@ 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 = self._handle_none_parameter(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")
@@ -62,3 +63,13 @@ class MCPTool(Tool):
             server_url=self.server_url,
             provider_id=self.provider_id,
         )
+
+    def _handle_none_parameter(self, parameter: dict[str, Any]) -> dict[str, Any]:
+        """
+        in mcp tool invoke, if the parameter is empty, it will be set to None
+        """
+        return {
+            key: value
+            for key, value in parameter.items()
+            if value is not None and not (isinstance(value, str) and value.strip() == "")
+        }