"Unrecognized" LLM completion with OpenAI Agents SDK + Streamed Chat Completions

[reuank]

Description

Hey there,

when I use the OpenAI Agents SDK (v0.6.4) together with the Chat Completions API and in streaming mode, I get an "Unrecognised" section in Logfire. This does not happen when using streaming with the Responses API.

Repro script:

import asyncio

import logfire
from agents import Agent, RawResponsesStreamEvent, Runner, set_default_openai_api
from dotenv import load_dotenv
from logfire import ConsoleOptions
from openai.types.responses import ResponseCompletedEvent


async def main():
    agent = Agent(
        name="Weather Agent",
        instructions="Your job is to always answer with random weather predictions..",
    )

    # Streamed
    result = Runner.run_streamed(agent, input="What's the weather in Berlin?")
    async for event in result.stream_events():
        if isinstance(event, RawResponsesStreamEvent) and isinstance(event.data, ResponseCompletedEvent):
            print(event.data.response.output[0].content[0].text)

    # Non-streamed
    result = await Runner.run(agent, input="What's the weather in Berlin?")
    print(result.final_output)


if __name__ == "__main__":
    _ = load_dotenv()
    _ = logfire.configure(
        console=ConsoleOptions(min_log_level="info"),
        service_name="cc-test",
    )
    set_default_openai_api("chat_completions")
    logfire.instrument_openai_agents()
    asyncio.run(main())

Any ideas what could cause that? Is the issue on the Logfire or the Agents SDK side?

Thanks for your help!

Python, Logfire & OS Versions, related packages (not required)

$ logfire info
logfire="4.16.0"
platform="macOS-15.4.1-arm64-arm-64bit"
python="3.12.2 (main, Feb 25 2024, 03:55:42) [Clang 17.0.6 ]"
[related_packages]
requests="2.32.5"
pydantic="2.12.5"
openai="2.13.0"
protobuf="5.29.5"
rich="14.2.0"
executing="2.2.1"
opentelemetry-api="1.39.1"
opentelemetry-exporter-otlp-proto-common="1.39.1"
opentelemetry-exporter-otlp-proto-http="1.39.1"
opentelemetry-instrumentation="0.60b1"
opentelemetry-proto="1.39.1"
opentelemetry-sdk="1.39.1"
opentelemetry-semantic-conventions="0.60b1