Python: [Bug]: `AgentResponse.value` is `None` when streaming workflow

[cecheta]

Description

If a workflow has an agent executor which has response_format set, the response format value is set to None if the workflow outputs are streamed. If the workflow is not streamed, the value is set as expected.

Code Sample

from typing import Never

from agent_framework import (
    AgentExecutorResponse,
    Workflow,
    WorkflowBuilder,
    WorkflowContext,
    executor,
)
from agent_framework.azure import AzureOpenAIResponsesClient
from azure.identity import DefaultAzureCredential
from pydantic import BaseModel


class Greeting(BaseModel):
    greeting: str


@executor
async def print_executor(message: AgentExecutorResponse, ctx: WorkflowContext[Never, str]):
    await ctx.yield_output(f"Value: {message.agent_response.value}, Text: {message.agent_response.text}")


def build_workflow() -> Workflow:
    agent = AzureOpenAIResponsesClient(credential=DefaultAzureCredential()).as_agent(
        default_options={
            "temperature": 0,
            "response_format": Greeting,
        }
    )
    return (
        WorkflowBuilder(
            start_executor=agent,
            output_executors=[print_executor],
        )
        .add_edge(agent, print_executor)
        .build()
    )


async def main() -> None:
    print("--------- Non-Streaming ---------")

    workflow = build_workflow()
    result = await workflow.run("Hello")
    for output in result.get_outputs():
        print(output)

    print("--------- Streaming ---------")

    workflow = build_workflow()
    async for output in workflow.run("Hello", stream=True):
        if output.type == "output":
            print(output.data)


if __name__ == "__main__":
    import asyncio

    asyncio.run(main())

Output

--------- Non-Streaming ---------
Value: greeting='Hello! How can I assist you today?', Text: {"greeting":"Hello! How can I assist you today?"}
--------- Streaming ---------
Value: None, Text: {"greeting":"Hello! How can I assist you today?"}

Package Versions

1.0.0b260212

Python Version

3.13

Additional Context

No response