OpenAI Responses-shaped helpers for app-owned Agent Framework hosting.

This package provides the Responses-specific conversion layer:

• responses_to_run(...) — convert a Responses request body into Agent Framework run values.
• responses_session_id(...) — return (session_id, is_conversation_id) for a prior resp_* response id or conv_* conversation id, or (None, None) when neither is present.
• create_conversation_id(...) — mint a Responses-shaped conversation id.
• create_response_id(...) — mint a Responses-shaped response id.
• responses_from_run(...) — convert an AgentResponse into a Responses-compatible JSON payload.
• responses_from_streaming_run(...) — convert an Agent Framework ResponseStream into Responses-compatible SSE events.

FastAPI/Starlette/Django/Azure Functions code owns route registration, authentication, status codes, response construction, and background work.

from agent_framework_hosting import AgentState
from agent_framework_hosting_responses import (
    create_response_id,
    responses_from_run,
    responses_session_id,
    responses_to_run,
)
from fastapi import Body, FastAPI
from fastapi.responses import JSONResponse

app = FastAPI()
state = AgentState(agent)


@app.post("/responses")
async def responses(body: dict = Body(...)) -> JSONResponse:
    run = responses_to_run(body)
    session_id, is_conversation_id = responses_session_id(body)
    response_id = create_response_id()
    session = await state.get_or_create_session(session_id or response_id)
    result = await (await state.get_target()).run(
        run["messages"],
        session=session,
        options=run["options"],
    )
    if is_conversation_id:
        # The app must serialize writers that advance this stable id.
        await state.set_session(session_id, session)
    else:
        await state.set_session(response_id, session)
    conversation_id = session_id if is_conversation_id else None
    return JSONResponse(responses_from_run(result, response_id=response_id, conversation_id=conversation_id))

previous_response_id identifies an immutable continuation snapshot: multiple requests may branch from it and store their results under distinct new response ids. conversation_id is a mutable head instead; only one caller should advance it at a time. These helpers do not provide per-conversation locking.

AgentState lives in agent-framework-hosting. The experimental in-memory and file-backed session stores live in core as agent_framework.SessionStore and agent_framework.FileSessionStore.