refactor(api/core/app/segments): Support more kinds of Segments. (#6706)

Signed-off-by: -LAN- <laipz8200@outlook.com>

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

@@ -126,6 +126,7 @@ class ToolNode(BaseNode):
             else:
                 tool_input = node_data.tool_parameters[parameter_name]
                 if tool_input.type == 'variable':
+                    # TODO: check if the variable exists in the variable pool
                     parameter_value = variable_pool.get(tool_input.value).value
                 else:
                     segment_group = parser.convert_template(