patched the Copilot client to sanitize malformed usage metadata before langchain_openai processes it

tradingagents/llm_clients/copilot_client.py

@@ -8,6 +8,7 @@ No env var or separate auth module needed — run ``gh auth login`` once.
 """
 
 import subprocess
+from copy import deepcopy
 from typing import Any, Optional
 
 import requests
@@ -117,10 +118,51 @@ def check_copilot_auth() -> bool:
 class NormalizedChatOpenAI(ChatOpenAI):
     """ChatOpenAI with normalized content output."""
 
+    def _create_chat_result(self, response, generation_info=None):
+        return super()._create_chat_result(
+            _sanitize_copilot_response(response), generation_info
+        )
+
     def invoke(self, input, config=None, **kwargs):
         return normalize_content(super().invoke(input, config, **kwargs))
 
 
+def _sanitize_copilot_response(response: Any) -> Any:
+    """Normalize Copilot token usage fields for langchain_openai.
+
+    Copilot can return ``service_tier`` along with ``None`` values in
+    ``cached_tokens`` or ``reasoning_tokens``. ``langchain_openai`` subtracts
+    those fields from the prompt/completion totals, which raises ``TypeError``
+    when the detail value is ``None``.
+    """
+    if isinstance(response, dict):
+        response_dict = deepcopy(response)
+    elif hasattr(response, "model_dump"):
+        response_dict = response.model_dump()
+    else:
+        return response
+
+    usage = response_dict.get("usage")
+    if not isinstance(usage, dict):
+        return response_dict
+
+    if response_dict.get("service_tier") not in {"priority", "flex"}:
+        return response_dict
+
+    prompt_details = usage.get("prompt_tokens_details")
+    if isinstance(prompt_details, dict) and prompt_details.get("cached_tokens") is None:
+        prompt_details["cached_tokens"] = 0
+
+    completion_details = usage.get("completion_tokens_details")
+    if (
+        isinstance(completion_details, dict)
+        and completion_details.get("reasoning_tokens") is None
+    ):
+        completion_details["reasoning_tokens"] = 0
+
+    return response_dict
+
+
 class CopilotClient(BaseLLMClient):
     """Client for GitHub Copilot inference API.