separate stream items for "tool_call_item" and "tool_call_output_item"

[gdisk]

In the following example, the tool call event and the tool call output event are triggered simultaneously,and I believe it's more reasonable to separate them.

test code

import logging

logging.basicConfig(
    format="%(asctime)s.%(msecs)03d - %(levelname)s - %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
)
logging.getLogger(__name__).setLevel(logging.DEBUG)
logger = logging.getLogger(__name__)

from agents import Runner, Agent, ItemHelpers, function_tool
import asyncio
import random


@function_tool
def how_many_jokes() -> int:
    await asyncio.sleep(3)
    return random.randint(1, 2)


async def main():
    agent = Agent(
        name="Joker",
        instructions="First call the `how_many_jokes` tool, then tell that many jokes.",
        tools=[how_many_jokes],
    )

    result = Runner.run_streamed(
        agent,
        input="Hello",
    )
    logger.debug("=== Run starting ===")
    async for event in result.stream_events():
        # We'll ignore the raw responses event deltas
        if event.type == "raw_response_event":
            continue
        elif event.type == "agent_updated_stream_event":
            logger.debug(f"Agent updated: {event.new_agent.name}")
        elif event.type == "run_item_stream_event":
            if event.item.type == "tool_call_item":
                logger.debug("-- Tool was called")
            elif event.item.type == "tool_call_output_item":
                logger.debug(f"-- Tool output: {event.item.output}")
            elif event.item.type == "message_output_item":
                logger.debug(
                    f"-- Message output:\n {ItemHelpers.text_message_output(event.item)}"
                )

    logger.debug("=== Run complete ===")


if __name__ == "__main__":
    asyncio.run(main())

current output

2025-06-09 17:02:38.588 - DEBUG - === Run starting ===
2025-06-09 17:02:38.588 - DEBUG - Agent updated: Joker
2025-06-09 17:02:39.770 - DEBUG - -- Tool was called
2025-06-09 17:02:39.770 - DEBUG - -- Tool output: 1
2025-06-09 17:02:40.788 - DEBUG - -- Message output:
 Here's a joke for you:

Why don't skeletons fight each other?

They don't have the guts!
2025-06-09 17:02:40.788 - DEBUG - === Run complete ===

For event.item.type in "tool_call_item" and "tool_call_output_item", they are triggered simultaneously, and I believe it's more reasonable to separate them.