TypeError: 'InputTokensDetails' object is not subscriptable when using Langtrace SDK with OpenAI Agents

[jdurago]

I’m encountering a TypeError when using the Langtrace SDK in combination with OpenAI Agents. The error occurs during response tracing, seemingly due to InputTokensDetails being treated as a dictionary instead of an object.

Here’s the relevant portion of the stack trace:

TypeError: 'InputTokensDetails' object is not subscriptable

File "langtrace_python_sdk/instrumentation/openai/patch.py", line 741, in _set_openai_agentic_response_attributes
"cached_tokens": response.usage.input_tokens_details["cached_tokens"],
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^

This suggests that input_tokens_details is an object, not a dictionary, and should likely be accessed via attributes, not keys.

I forked the langtrace sdk and patched up that line locally and it seemed to work.

Setup
• Python 3.12
• langtrace-python-sdk v3.8.9
• openai-agents v0.0.7
• exporting traces to locally hosted jaeger endpoint

Let me know if you need any further details or a minimal repro!

[karthikscale3]

Thanks for reporting this. We will take a look and get back to you.