diff --git a/apps/application/workflow/nodes/tool_start_node/__init__.py b/apps/application/workflow/nodes/tool_start_node/__init__.py
new file mode 100644
index 00000000000..bb9f7dc8336
--- /dev/null
+++ b/apps/application/workflow/nodes/tool_start_node/__init__.py
@@ -0,0 +1,10 @@
+# coding=utf-8
+"""
+@project: MaxKB
+@Author:  虎虎虎
+@file:    __init__.py
+@date:    2026/9/3 17:20
+@desc:
+"""
+
+from .tool_start_node import ToolStartNode
diff --git a/apps/application/workflow/nodes/tool_start_node/tool_start_node.py b/apps/application/workflow/nodes/tool_start_node/tool_start_node.py
new file mode 100644
index 00000000000..efb746f0211
--- /dev/null
+++ b/apps/application/workflow/nodes/tool_start_node/tool_start_node.py
@@ -0,0 +1,54 @@
+# coding=utf-8
+"""
+@project:  MaxKB
+@Author:   虎虎虎
+@file:     tool_start_node.py
+@date:     2026/9/3 17:20
+@desc:     工具工作流的起始节点，负责把工具入参写入全局变量、初始化输出字段
+"""
+
+from application.workflow.common import WorkflowType
+from application.workflow.i_node import INode
+
+
+class ToolStartNode(INode):
+    supported_workflow_type_list = [WorkflowType.TOOL]
+    type = "tool-start-node"
+
+    def execute(self):
+        workflow_params = self.get_workflow_parameters()
+        base_node = self.workflow_manage.workflow.get_node("tool-base-node")
+        user_input_field_list = base_node.properties.get("user_input_field_list", []) if base_node else []
+        user_output_field_list = base_node.properties.get("user_output_field_list", []) if base_node else []
+
+        # 入参 -> 全局变量（引用约定 global.<field>）
+        for item in user_input_field_list:
+            field = item.get("field")
+            self.workflow_manage.write_context("global", field, workflow_params.get(field))
+
+        # 初始化输出字段默认值 -> output（工作流内由变量赋值节点覆写）
+        for item in user_output_field_list:
+            if item.get("default_value", None) is not None:
+                self.workflow_manage.write_context("output", item.get("field"), item.get("default_value"))
+
+        self.write_context("question", workflow_params.get("question", ""))
+
+    def get_details(self, index: int = 0, position: dict = None, old_details: dict = None, **kwargs):
+        details = super().get_details(index, position, old_details, **kwargs)
+        global_fields = []
+        for field in (self.node.properties.get("config") or {}).get("globalFields", []) or []:
+            key = field.get("value")
+            global_fields.append(
+                {
+                    "label": field.get("label"),
+                    "key": key,
+                    "value": self.workflow_manage.get_context("global", key) or "",
+                }
+            )
+        details.update(
+            {
+                "question": self.get_context("question"),
+                "global_fields": global_fields,
+            }
+        )
+        return details