feat: add MCP support (#20716)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>

api/core/workflow/nodes/tool/entities.py

@@ -41,6 +41,10 @@ class ToolNodeData(BaseNodeData, ToolEntity):
         def check_type(cls, value, validation_info: ValidationInfo):
             typ = value
             value = validation_info.data.get("value")
+
+            if value is None:
+                return typ
+
             if typ == "mixed" and not isinstance(value, str):
                 raise ValueError("value must be a string")
             elif typ == "variable":
@@ -54,3 +58,22 @@ class ToolNodeData(BaseNodeData, ToolEntity):
             return typ
 
     tool_parameters: dict[str, ToolInput]
+
+    @field_validator("tool_parameters", mode="before")
+    @classmethod
+    def filter_none_tool_inputs(cls, value):
+        if not isinstance(value, dict):
+            return value
+
+        return {
+            key: tool_input
+            for key, tool_input in value.items()
+            if tool_input is not None and cls._has_valid_value(tool_input)
+        }
+
+    @staticmethod
+    def _has_valid_value(tool_input):
+        """Check if the value is valid"""
+        if isinstance(tool_input, dict):
+            return tool_input.get("value") is not None
+        return getattr(tool_input, "value", None) is not None

api/core/workflow/nodes/tool/tool_node.py

@@ -67,8 +67,9 @@ class ToolNode(BaseNode[ToolNodeData]):
         try:
             from core.tools.tool_manager import ToolManager
 
+            variable_pool = self.graph_runtime_state.variable_pool if self.node_data.version != "1" else None
             tool_runtime = ToolManager.get_workflow_tool_runtime(
-                self.tenant_id, self.app_id, self.node_id, self.node_data, self.invoke_from
+                self.tenant_id, self.app_id, self.node_id, self.node_data, self.invoke_from, variable_pool
             )
         except ToolNodeError as e:
             yield RunCompletedEvent(
@@ -95,7 +96,6 @@ class ToolNode(BaseNode[ToolNodeData]):
             node_data=self.node_data,
             for_log=True,
         )
-
         # get conversation id
         conversation_id = self.graph_runtime_state.variable_pool.get(["sys", SystemVariableKey.CONVERSATION_ID])