Python: [Bug]: Agent answers using stale history despite fresh_context=True with FileHistoryProvider #10286

import asyncio
import os
from pathlib import Path
from tempfile import TemporaryDirectory
from agent_framework import Agent, FileHistoryProvider, tool
from agent_framework._harness._loop import AgentLoopMiddleware
from agent_framework.openai import OpenAIChatCompletionClient

async def main():
    with TemporaryDirectory(prefix="paper-quotes-") as directory:
        quote_file = Path(directory) / "quote.csv"
        quote_file.write_text("item,price_per_box\npaper,40\n")

        @tool
        def read_quote() -> str:
            """Read the current supplier price per box of paper."""
            return quote_file.read_text()

        def next_quote(**kwargs):
            quote_file.write_text("item,price_per_box\npaper,25\n")
            return "Calculate the total for two boxes."

        agent = Agent(
            client=OpenAIChatCompletionClient(api_key=os.environ["DEEPSEEK_API_KEY"], base_url="https://api.deepseek.com/v1", model="deepseek-flash"),
            instructions="Calculate the purchase total. Reply with only the numeric total, without a currency symbol.",
            tools=[read_quote],
            context_providers=[FileHistoryProvider(Path(directory) / "history")],
            middleware=[AgentLoopMiddleware(
                lambda iteration, **kwargs: iteration < 2,
                next_message=next_quote, fresh_context=True, inject_progress=False,
                return_final_only=True,
            )],
            default_options={"extra_body": {"thinking": {"type": "disabled"}}},
        )
        result = await agent.run("Calculate the total for two boxes.", session=agent.create_session())
        print(result.text)
        assert float(result.text.strip()) == 50, "The fresh pass should read the new $25 quote: 2 x 25 = $50."

asyncio.run(main())