fix: refine handling of constant and mixed input types in ToolManager and ToolNodeData (#22903)

api/core/tools/tool_manager.py

@@ -1011,7 +1011,9 @@ class ToolManager:
                         if variable is None:
                             raise ToolParameterError(f"Variable {tool_input.value} does not exist")
                         parameter_value = variable.value
-                    elif tool_input.type in {"mixed", "constant"}:
+                    elif tool_input.type == "constant":
+                        parameter_value = tool_input.value
+                    elif tool_input.type == "mixed":
                         segment_group = variable_pool.convert_template(str(tool_input.value))
                         parameter_value = segment_group.text
                     else:

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

@@ -54,7 +54,7 @@ class ToolNodeData(BaseNodeData, ToolEntity):
                 for val in value:
                     if not isinstance(val, str):
                         raise ValueError("value must be a list of strings")
-            elif typ == "constant" and not isinstance(value, str | int | float | bool):
+            elif typ == "constant" and not isinstance(value, str | int | float | bool | dict):
                 raise ValueError("value must be a string, int, float, or bool")
             return typ