add python tool patch

Signed-off-by: Chen Zhang <[email protected]>

Author: heheda12345

vllm/entrypoints/tool.py

@@ -2,7 +2,9 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import os
 from abc import ABC, abstractmethod
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING, Any, Optional
+
+from openai_harmony import Message
 
 from vllm.logger import init_logger
 
@@ -70,7 +72,16 @@ def __init__(self):
                 "gpt_oss is not installed, code interpreter is disabled")
             return
 
-        self.python_tool = PythonTool()
+        # NOTE (Chen): as of gpt-oss 0.0.2, there is a bug in _make_response
+        # and we do the following monkey patch to fix it.
+        class PatchedGptOssPythonToolPatch(PythonTool):
+
+            def _make_response(self,
+                               output: str,
+                               channel: Optional[str] = None) -> Message:
+                return super()._make_response(output)
+
+        self.python_tool = PatchedGptOssPythonToolPatch()
         logger.info_once("Code interpreter tool initialized")
 
     async def get_result(self, context: "ConversationContext") -> Any: