serving_responses.py 83.9 KB
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# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project

import asyncio
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import json
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import time
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import uuid
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from collections import deque
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from collections.abc import AsyncGenerator, AsyncIterator, Callable, Sequence
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from contextlib import AsyncExitStack
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from copy import copy
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from http import HTTPStatus
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from typing import Final
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import jinja2
from fastapi import Request
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from openai.types.responses import (
    ResponseCodeInterpreterCallCodeDeltaEvent,
    ResponseCodeInterpreterCallCodeDoneEvent,
    ResponseCodeInterpreterCallCompletedEvent,
    ResponseCodeInterpreterCallInProgressEvent,
    ResponseCodeInterpreterCallInterpretingEvent,
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    ResponseCodeInterpreterToolCallParam,
    ResponseContentPartAddedEvent,
    ResponseContentPartDoneEvent,
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    ResponseFunctionCallArgumentsDeltaEvent,
    ResponseFunctionCallArgumentsDoneEvent,
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    ResponseFunctionToolCall,
    ResponseFunctionWebSearch,
    ResponseOutputItem,
    ResponseOutputItemAddedEvent,
    ResponseOutputItemDoneEvent,
    ResponseOutputMessage,
    ResponseOutputText,
    ResponseReasoningItem,
    ResponseReasoningTextDeltaEvent,
    ResponseReasoningTextDoneEvent,
    ResponseStatus,
    ResponseTextDeltaEvent,
    ResponseTextDoneEvent,
    ResponseWebSearchCallCompletedEvent,
    ResponseWebSearchCallInProgressEvent,
    ResponseWebSearchCallSearchingEvent,
    response_function_web_search,
    response_text_delta_event,
)
from openai.types.responses.response_output_text import Logprob, LogprobTopLogprob
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from openai.types.responses.response_reasoning_item import (
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    Content as ResponseReasoningTextContent,
)
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from openai.types.responses.tool import Tool
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from openai_harmony import Message as OpenAIHarmonyMessage
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from vllm import envs
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from vllm.engine.protocol import EngineClient
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from vllm.entrypoints.chat_utils import (
    ChatCompletionMessageParam,
    ChatTemplateContentFormatOption,
)
from vllm.entrypoints.context import (
    ConversationContext,
    HarmonyContext,
    SimpleContext,
    StreamingHarmonyContext,
)
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from vllm.entrypoints.harmony_utils import (
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    construct_harmony_previous_input_messages,
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    get_developer_message,
    get_stop_tokens_for_assistant_actions,
    get_system_message,
    get_user_message,
    has_custom_tools,
    parse_output_message,
    parse_remaining_state,
    parse_response_input,
    render_for_completion,
)
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from vllm.entrypoints.logger import RequestLogger
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from vllm.entrypoints.openai.protocol import (
    DeltaMessage,
    ErrorResponse,
    InputTokensDetails,
    OutputTokensDetails,
    RequestResponseMetadata,
    ResponseCompletedEvent,
    ResponseCreatedEvent,
    ResponseInProgressEvent,
    ResponseReasoningPartAddedEvent,
    ResponseReasoningPartDoneEvent,
    ResponsesRequest,
    ResponsesResponse,
    ResponseUsage,
    StreamingResponsesResponse,
)
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from vllm.entrypoints.openai.serving_engine import OpenAIServing
from vllm.entrypoints.openai.serving_models import OpenAIServingModels
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from vllm.entrypoints.tool_server import ToolServer
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from vllm.inputs.data import TokensPrompt as EngineTokensPrompt
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from vllm.logger import init_logger
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from vllm.logprobs import Logprob as SampleLogprob
from vllm.logprobs import SampleLogprobs
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from vllm.outputs import CompletionOutput
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from vllm.sampling_params import SamplingParams, StructuredOutputsParams
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from vllm.transformers_utils.tokenizer import AnyTokenizer
from vllm.utils import random_uuid

logger = init_logger(__name__)


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def extract_tool_types(tools: list[Tool]) -> set[str]:
    """
    Extracts the tool types from the given tools.
    """
    tool_types: set[str] = set()
    for tool in tools:
        if tool.type == "mcp":
            # Allow the MCP Tool type to enable built in tools if the
            # server_label is allowlisted in
            # envs.VLLM_GPT_OSS_SYSTEM_TOOL_MCP_LABELS
            if tool.server_label in envs.VLLM_GPT_OSS_SYSTEM_TOOL_MCP_LABELS:
                tool_types.add(tool.server_label)
        else:
            tool_types.add(tool.type)
    return tool_types


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class OpenAIServingResponses(OpenAIServing):
    def __init__(
        self,
        engine_client: EngineClient,
        models: OpenAIServingModels,
        *,
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        request_logger: RequestLogger | None,
        chat_template: str | None,
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        chat_template_content_format: ChatTemplateContentFormatOption,
        return_tokens_as_token_ids: bool = False,
        reasoning_parser: str = "",
        enable_auto_tools: bool = False,
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        tool_parser: str | None = None,
        tool_server: ToolServer | None = None,
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        enable_prompt_tokens_details: bool = False,
        enable_force_include_usage: bool = False,
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        enable_log_outputs: bool = False,
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        log_error_stack: bool = False,
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    ) -> None:
        super().__init__(
            engine_client=engine_client,
            models=models,
            request_logger=request_logger,
            return_tokens_as_token_ids=return_tokens_as_token_ids,
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            log_error_stack=log_error_stack,
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        )

        self.chat_template = chat_template
        self.chat_template_content_format: Final = chat_template_content_format
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        self.enable_log_outputs = enable_log_outputs
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        self.reasoning_parser = self._get_reasoning_parser(
            reasoning_parser_name=reasoning_parser
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        )
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        self.enable_prompt_tokens_details = enable_prompt_tokens_details
        self.enable_force_include_usage = enable_force_include_usage
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        self.default_sampling_params = self.model_config.get_diff_sampling_param()
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        if self.default_sampling_params:
            source = self.model_config.generation_config
            source = "model" if source == "auto" else source
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            logger.info(
                "Using default chat sampling params from %s: %s",
                source,
                self.default_sampling_params,
            )
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        # If False (default), the "store" option is (silently) ignored and the
        # response is not stored. If True, the response is stored in memory.
        # NOTE(woosuk): This may not be intuitive for users, as the default
        # behavior in OpenAI's Responses API is to store the response, but
        # vLLM's default behavior is not.
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        self.enable_store = envs.VLLM_ENABLE_RESPONSES_API_STORE
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        if self.enable_store:
            logger.warning_once(
                "`VLLM_ENABLE_RESPONSES_API_STORE` is enabled. This may "
                "cause a memory leak since we never remove responses from "
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                "the store."
            )
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        self.use_harmony = self.model_config.hf_config.model_type == "gpt_oss"
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        if self.use_harmony:
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            logger.warning(
                "For gpt-oss, we ignore --enable-auto-tool-choice "
                "and always enable tool use."
            )
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            # OpenAI models have two EOS-like tokens: <|return|> and <|call|>.
            # We need to add them to the stop token ids.
            if "stop_token_ids" not in self.default_sampling_params:
                self.default_sampling_params["stop_token_ids"] = []
            self.default_sampling_params["stop_token_ids"].extend(
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                get_stop_tokens_for_assistant_actions()
            )
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        # set up tool use
        self.enable_auto_tools: bool = enable_auto_tools
        if self.enable_auto_tools:
            logger.info(
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                '"auto" tool choice has been enabled please note that while'
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                " the parallel_tool_calls client option is preset for "
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                "compatibility reasons, it will be ignored."
            )
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        # HACK(woosuk): This is a hack. We should use a better store.
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        # FIXME: If enable_store=True, this may cause a memory leak since we
        # never remove responses from the store.
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        self.response_store: dict[str, ResponsesResponse] = {}
        self.response_store_lock = asyncio.Lock()

        # HACK(woosuk): This is a hack. We should use a better store.
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        # FIXME: If enable_store=True, this may cause a memory leak since we
        # never remove messages from the store.
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        self.msg_store: dict[str, list[ChatCompletionMessageParam]] = {}

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        # HACK(wuhang): This is a hack. We should use a better store.
        # FIXME: If enable_store=True, this may cause a memory leak since we
        # never remove events from the store.
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        self.event_store: dict[
            str, tuple[deque[StreamingResponsesResponse], asyncio.Event]
        ] = {}
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        self.background_tasks: dict[str, asyncio.Task] = {}

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        self.tool_server = tool_server

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    def _validate_generator_input(
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        self, engine_prompt: EngineTokensPrompt
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    ) -> ErrorResponse | None:
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        """Add validations to the input to the generator here."""
        if self.max_model_len <= len(engine_prompt["prompt_token_ids"]):
            error_message = (
                "The engine prompt length"
                f" {len(engine_prompt['prompt_token_ids'])} "
                f"exceeds the max_model_len {self.max_model_len}. "
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                "Please reduce prompt."
            )
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            return self.create_error_response(
                err_type="invalid_request_error",
                message=error_message,
                status_code=HTTPStatus.BAD_REQUEST,
            )
        return None

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    def _validate_create_responses_input(
        self, request: ResponsesRequest
    ) -> ErrorResponse | None:
        if self.use_harmony and request.is_include_output_logprobs():
            return self.create_error_response(
                err_type="invalid_request_error",
                message="logprobs are not supported with gpt-oss models",
                status_code=HTTPStatus.BAD_REQUEST,
            )
        if request.store and not self.enable_store and request.background:
            return self.create_error_response(
                err_type="invalid_request_error",
                message=(
                    "This vLLM engine does not support `store=True` and "
                    "therefore does not support the background mode. To "
                    "enable these features, set the environment variable "
                    "`VLLM_ENABLE_RESPONSES_API_STORE=1` when launching "
                    "the vLLM server."
                ),
                status_code=HTTPStatus.BAD_REQUEST,
            )
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        if request.previous_input_messages and request.previous_response_id:
            return self.create_error_response(
                err_type="invalid_request_error",
                message="Only one of `previous_input_messages` and "
                "`previous_response_id` can be set.",
                status_code=HTTPStatus.BAD_REQUEST,
            )
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        return None

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    async def create_responses(
        self,
        request: ResponsesRequest,
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        raw_request: Request | None = None,
    ) -> (
        AsyncGenerator[StreamingResponsesResponse, None]
        | ResponsesResponse
        | ErrorResponse
    ):
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        error_check_ret = await self._check_model(request)
        if error_check_ret is not None:
            logger.error("Error with model %s", error_check_ret)
            return error_check_ret
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        maybe_validation_error = self._validate_create_responses_input(request)
        if maybe_validation_error is not None:
            return maybe_validation_error
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        # If the engine is dead, raise the engine's DEAD_ERROR.
        # This is required for the streaming case, where we return a
        # success status before we actually start generating text :).
        if self.engine_client.errored:
            raise self.engine_client.dead_error

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        if request.store and not self.enable_store:
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            # Disable the store option.
            # NOTE(woosuk): Although returning an error is possible, we opted
            # to implicitly disable store and process the request anyway, as
            # we assume most users do not intend to actually store the response
            # (i.e., their request's `store=True` just because it's the default
            # value).
            request.store = False
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        # Handle the previous response ID.
        prev_response_id = request.previous_response_id
        if prev_response_id is not None:
            async with self.response_store_lock:
                prev_response = self.response_store.get(prev_response_id)
            if prev_response is None:
                return self._make_not_found_error(prev_response_id)
        else:
            prev_response = None

        try:
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            lora_request = self._maybe_get_adapters(request)
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            model_name = self.models.model_name(lora_request)
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            tokenizer = await self.engine_client.get_tokenizer()
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            if self.use_harmony:
                messages, request_prompts, engine_prompts = (
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                    self._make_request_with_harmony(request, prev_response)
                )
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            else:
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                messages, request_prompts, engine_prompts = await self._make_request(
                    request, prev_response, tokenizer
                )
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        except (
            ValueError,
            TypeError,
            RuntimeError,
            jinja2.TemplateError,
            NotImplementedError,
        ) as e:
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            logger.exception("Error in preprocessing prompt inputs")
            return self.create_error_response(f"{e} {e.__cause__}")

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        request_metadata = RequestResponseMetadata(request_id=request.request_id)
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        if raw_request:
            raw_request.state.request_metadata = request_metadata

        # Schedule the request and get the result generator.
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        generators: list[AsyncGenerator[ConversationContext, None]] = []
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        builtin_tool_list: list[str] = []
        if self.use_harmony and self.tool_server is not None:
            if self.tool_server.has_tool("browser"):
                builtin_tool_list.append("browser")
            if self.tool_server.has_tool("python"):
                builtin_tool_list.append("python")
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            if self.tool_server.has_tool("container"):
                builtin_tool_list.append("container")
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        if self.tool_server is not None:
            available_tools = builtin_tool_list
        else:
            assert len(builtin_tool_list) == 0
            available_tools = []
        try:
            for i, engine_prompt in enumerate(engine_prompts):
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                maybe_error = self._validate_generator_input(engine_prompt)
                if maybe_error is not None:
                    return maybe_error

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                default_max_tokens = self.max_model_len - len(
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                    engine_prompt["prompt_token_ids"]
                )
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                sampling_params = request.to_sampling_params(
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                    default_max_tokens, self.default_sampling_params
                )
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                trace_headers = (
                    None
                    if raw_request is None
                    else await self._get_trace_headers(raw_request.headers)
                )
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                context: ConversationContext
                if self.use_harmony:
                    if request.stream:
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                        context = StreamingHarmonyContext(messages, available_tools)
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                    else:
                        context = HarmonyContext(messages, available_tools)
                else:
                    context = SimpleContext()
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                if self.reasoning_parser is not None:
                    reasoning_parser = self.reasoning_parser(tokenizer)
                    if sampling_params.structured_outputs is None:
                        sampling_params.structured_outputs = StructuredOutputsParams()
                    struct_out = sampling_params.structured_outputs
                    if struct_out.all_non_structural_tag_constraints_none():
                        sampling_params.structured_outputs.structural_tag = (
                            reasoning_parser.prepare_structured_tag(
                                sampling_params.structured_outputs.structural_tag,
                                self.tool_server,
                            )
                        )
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                generator = self._generate_with_builtin_tools(
                    request_id=request.request_id,
                    request_prompt=request_prompts[i],
                    engine_prompt=engine_prompt,
                    sampling_params=sampling_params,
                    context=context,
                    lora_request=lora_request,
                    priority=request.priority,
                    trace_headers=trace_headers,
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                )
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                generators.append(generator)
        except ValueError as e:
            # TODO: Use a vllm-specific Validation Error
            return self.create_error_response(str(e))
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        assert len(generators) == 1
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        (result_generator,) = generators
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        # Store the input messages.
        if request.store:
            self.msg_store[request.request_id] = messages
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        if request.background:
            created_time = int(time.time())
            response = ResponsesResponse.from_request(
                request,
                sampling_params,
                model_name=model_name,
                created_time=created_time,
                output=[],
                status="queued",
                usage=None,
            )
            async with self.response_store_lock:
                self.response_store[response.id] = response
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            # Run the request in the background.
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            if request.stream:
                task = asyncio.create_task(
                    self._run_background_request_stream(
                        request,
                        sampling_params,
                        result_generator,
                        context,
                        model_name,
                        tokenizer,
                        request_metadata,
                        created_time,
                    ),
                    name=f"create_{request.request_id}",
                )
            else:
                task = asyncio.create_task(
                    self._run_background_request(
                        request,
                        sampling_params,
                        result_generator,
                        context,
                        model_name,
                        tokenizer,
                        request_metadata,
                        created_time,
                    ),
                    name=f"create_{response.id}",
                )
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            # For cleanup.
            response_id = response.id
            self.background_tasks[response_id] = task
            task.add_done_callback(
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                lambda _: self.background_tasks.pop(response_id, None)
            )
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            if request.stream:
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                return self.responses_background_stream_generator(request.request_id)
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            return response

        if request.stream:
            return self.responses_stream_generator(
                request,
                sampling_params,
                result_generator,
                context,
                model_name,
                tokenizer,
                request_metadata,
            )

        try:
            return await self.responses_full_generator(
                request,
                sampling_params,
                result_generator,
                context,
                model_name,
                tokenizer,
                request_metadata,
            )
        except Exception as e:
            return self.create_error_response(str(e))
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    async def _make_request(
        self,
        request: ResponsesRequest,
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        prev_response: ResponsesResponse | None,
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        tokenizer: AnyTokenizer,
    ):
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        if len(request.tools) > 0:
            raise NotImplementedError(
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                "Tool use is not supported in Responses API without Harmony"
            )
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        # Construct the input messages.
        messages = self._construct_input_messages(request, prev_response)
        _, request_prompts, engine_prompts = await self._preprocess_chat(
            request,
            tokenizer,
            messages,
            chat_template=self.chat_template,
            chat_template_content_format=self.chat_template_content_format,
        )
        return messages, request_prompts, engine_prompts

    def _make_request_with_harmony(
        self,
        request: ResponsesRequest,
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        prev_response: ResponsesResponse | None,
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    ):
        if request.tool_choice != "auto":
            raise NotImplementedError(
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                "Only 'auto' tool_choice is supported in response API with Harmony"
            )
        messages = self._construct_input_messages_with_harmony(request, prev_response)
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        prompt_token_ids = render_for_completion(messages)
        engine_prompt = EngineTokensPrompt(prompt_token_ids=prompt_token_ids)
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        # Add cache_salt if provided in the request
        if request.cache_salt is not None:
            engine_prompt["cache_salt"] = request.cache_salt

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        return messages, [prompt_token_ids], [engine_prompt]

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    async def _initialize_tool_sessions(
        self,
        request: ResponsesRequest,
        context: ConversationContext,
        exit_stack: AsyncExitStack,
    ):
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        # we should only initialize the tool session if the request needs tools
        if len(request.tools) == 0:
            return
        mcp_tools = {
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            tool.server_label: tool for tool in request.tools if tool.type == "mcp"
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        }
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        await context.init_tool_sessions(
            self.tool_server, exit_stack, request.request_id, mcp_tools
        )
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    async def responses_full_generator(
        self,
        request: ResponsesRequest,
        sampling_params: SamplingParams,
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        result_generator: AsyncIterator[ConversationContext],
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        context: ConversationContext,
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        model_name: str,
        tokenizer: AnyTokenizer,
        request_metadata: RequestResponseMetadata,
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        created_time: int | None = None,
    ) -> ErrorResponse | ResponsesResponse:
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        if created_time is None:
            created_time = int(time.time())

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        async with AsyncExitStack() as exit_stack:
            try:
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                await self._initialize_tool_sessions(request, context, exit_stack)
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                async for _ in result_generator:
                    pass
            except asyncio.CancelledError:
                return self.create_error_response("Client disconnected")
            except ValueError as e:
                # TODO: Use a vllm-specific Validation Error
                return self.create_error_response(str(e))
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        # NOTE: Implementation of stauts is still WIP, but for now
        # we guarantee that if the status is not "completed", it is accurate.
        # "completed" is implemented as the "catch-all" for now.
        status: ResponseStatus = "completed"

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        input_messages = None
        output_messages = None
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        if self.use_harmony:
            assert isinstance(context, HarmonyContext)
            output = self._make_response_output_items_with_harmony(context)
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            if request.enable_response_messages:
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                input_messages = context.messages[: context.num_init_messages]
                output_messages = context.messages[context.num_init_messages :]
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            num_tool_output_tokens = context.num_tool_output_tokens
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            if len(output) > 0:
                if context.finish_reason == "length":
                    status = "incomplete"
                elif context.finish_reason == "abort":
                    status = "cancelled"
            else:
                status = "incomplete"
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        else:
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            assert isinstance(context, SimpleContext)
            final_res = context.last_output
            assert final_res is not None
            assert len(final_res.outputs) == 1
            final_output = final_res.outputs[0]

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            output = self._make_response_output_items(request, final_output, tokenizer)
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            # TODO: context for non-gptoss models doesn't use messages
            # so we can't get them out yet
            if request.enable_response_messages:
                raise NotImplementedError(
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                    "enable_response_messages is currently only supported for gpt-oss"
                )
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            # Calculate usage.
            assert final_res.prompt_token_ids is not None
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            num_tool_output_tokens = 0

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        assert isinstance(context, (SimpleContext, HarmonyContext))
        num_prompt_tokens = context.num_prompt_tokens
        num_generated_tokens = context.num_output_tokens
        num_cached_tokens = context.num_cached_tokens
        num_reasoning_tokens = context.num_reasoning_tokens
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        usage = ResponseUsage(
            input_tokens=num_prompt_tokens,
            output_tokens=num_generated_tokens,
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            total_tokens=num_prompt_tokens + num_generated_tokens,
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            input_tokens_details=InputTokensDetails(
                cached_tokens=num_cached_tokens,
                input_tokens_per_turn=[
                    turn.input_tokens for turn in context.all_turn_metrics
                ],
                cached_tokens_per_turn=[
                    turn.cached_input_tokens for turn in context.all_turn_metrics
                ],
            ),
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            output_tokens_details=OutputTokensDetails(
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                reasoning_tokens=num_reasoning_tokens,
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                tool_output_tokens=num_tool_output_tokens,
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                output_tokens_per_turn=[
                    turn.output_tokens for turn in context.all_turn_metrics
                ],
                tool_output_tokens_per_turn=[
                    turn.tool_output_tokens for turn in context.all_turn_metrics
                ],
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            ),
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        )
        response = ResponsesResponse.from_request(
            request,
            sampling_params,
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            input_messages=input_messages,
            output_messages=output_messages,
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            model_name=model_name,
            created_time=created_time,
            output=output,
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            status=status,
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            usage=usage,
        )

        if request.store:
            async with self.response_store_lock:
                stored_response = self.response_store.get(response.id)
                # If the response is already cancelled, don't update it.
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                if stored_response is None or stored_response.status != "cancelled":
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                    self.response_store[response.id] = response
        return response

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    def _topk_logprobs(
        self,
        logprobs: dict[int, SampleLogprob],
        top_logprobs: int,
        tokenizer: AnyTokenizer,
    ) -> list[LogprobTopLogprob]:
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        """Returns the top-k logprobs from the logprobs dictionary."""
        out = []
        for i, (token_id, _logprob) in enumerate(logprobs.items()):
            if i >= top_logprobs:
                break
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            text = (
                _logprob.decoded_token
                if _logprob.decoded_token is not None
                else tokenizer.decode([token_id])
            )
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            out.append(
                LogprobTopLogprob(
                    token=text,
                    logprob=max(_logprob.logprob, -9999.0),
                    bytes=list(text.encode("utf-8", errors="replace")),
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                )
            )
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        return out

    def _create_response_logprobs(
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        self,
        token_ids: Sequence[int],
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        logprobs: SampleLogprobs | None,
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        tokenizer: AnyTokenizer,
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        top_logprobs: int | None = None,
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    ) -> list[Logprob]:
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        assert logprobs is not None, "logprobs must be provided"
        assert len(token_ids) == len(logprobs), (
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            "token_ids and logprobs.token_ids must have the same length"
        )
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        out = []
        for i, token_id in enumerate(token_ids):
            logprob = logprobs[i]
            token_logprob = logprob[token_id]
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            text = (
                token_logprob.decoded_token
                if token_logprob.decoded_token is not None
                else tokenizer.decode([token_id])
            )
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            out.append(
                Logprob(
                    token=text,
                    logprob=max(token_logprob.logprob, -9999.0),
                    bytes=list(text.encode("utf-8", errors="replace")),
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                    top_logprobs=(
                        self._topk_logprobs(
                            logprob, top_logprobs=top_logprobs, tokenizer=tokenizer
                        )
                        if top_logprobs
                        else []
                    ),
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                )
            )
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        return out

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    def _create_stream_response_logprobs(
        self,
        token_ids: Sequence[int],
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        logprobs: SampleLogprobs | None,
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        tokenizer: AnyTokenizer,
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        top_logprobs: int | None = None,
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    ) -> list[response_text_delta_event.Logprob]:
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        lgs = self._create_response_logprobs(
            token_ids=token_ids,
            logprobs=logprobs,
            tokenizer=tokenizer,
            top_logprobs=top_logprobs,
        )
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        return [
            response_text_delta_event.Logprob(
                token=lg.token,
                logprob=lg.logprob,
                top_logprobs=[
                    response_text_delta_event.LogprobTopLogprob(
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                        token=tl.token, logprob=tl.logprob
                    )
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                    for tl in lg.top_logprobs
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                ],
            )
            for lg in lgs
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        ]

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    def _make_response_output_items(
        self,
        request: ResponsesRequest,
        final_output: CompletionOutput,
        tokenizer: AnyTokenizer,
    ) -> list[ResponseOutputItem]:
        if self.reasoning_parser:
            try:
                reasoning_parser = self.reasoning_parser(tokenizer)
            except RuntimeError as e:
                logger.exception("Error in reasoning parser creation.")
                raise e

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            reasoning_content, content = reasoning_parser.extract_reasoning_content(
                final_output.text, request=request
            )
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        else:
            reasoning_content = None
            content = final_output.text

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        # Log complete response if output logging is enabled
        if self.enable_log_outputs and self.request_logger:
            output_text = ""
            if content:
                output_text = content
            elif reasoning_content:
                output_text = f"[reasoning: {reasoning_content}]"

            if output_text:
                self.request_logger.log_outputs(
                    request_id=request.request_id,
                    outputs=output_text,
                    output_token_ids=final_output.token_ids,
                    finish_reason=final_output.finish_reason,
                    is_streaming=False,
                    delta=False,
                )

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        output = []
        if reasoning_content:
            reasoning_item = ResponseReasoningItem(
                id=f"rs_{random_uuid()}",
                summary=[],
                type="reasoning",
                content=[
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                    ResponseReasoningTextContent(
                        text=reasoning_content, type="reasoning_text"
                    )
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                ],
                status=None,  # NOTE: Only the last output item has status.
            )
            output.append(reasoning_item)
        if content:
            output_text = ResponseOutputText(
                text=content,
                annotations=[],  # TODO
                type="output_text",
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                logprobs=(
                    self._create_response_logprobs(
                        token_ids=final_output.token_ids,
                        logprobs=final_output.logprobs,
                        tokenizer=tokenizer,
                        top_logprobs=request.top_logprobs,
                    )
                    if request.is_include_output_logprobs()
                    else None
                ),
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            )
            message = ResponseOutputMessage(
                id=f"msg_{random_uuid()}",
                content=[output_text],
                role="assistant",
                status="completed",
                type="message",
            )
            output.append(message)
        return output

    def _make_response_output_items_with_harmony(
        self,
        context: HarmonyContext,
    ) -> list[ResponseOutputItem]:
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        output_items: list[ResponseOutputItem] = []
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        num_init_messages = context.num_init_messages
        for msg in context.messages[num_init_messages:]:
            output_items.extend(parse_output_message(msg))
        # Handle the generation stopped in the middle (if any).
        last_items = parse_remaining_state(context.parser)
        if last_items:
            output_items.extend(last_items)
        return output_items

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    def _construct_input_messages(
        self,
        request: ResponsesRequest,
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        prev_response: ResponsesResponse | None = None,
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    ) -> list[ChatCompletionMessageParam]:
        messages: list[ChatCompletionMessageParam] = []
        if request.instructions:
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            messages.append(
                {
                    "role": "system",
                    "content": request.instructions,
                }
            )
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        # Prepend the conversation history.
        if prev_response is not None:
            # Add the previous messages.
            prev_msg = self.msg_store[prev_response.id]
            messages.extend(prev_msg)

            # Add the previous output.
            for output_item in prev_response.output:
                # NOTE: We skip the reasoning output.
                if isinstance(output_item, ResponseOutputMessage):
                    for content in output_item.content:
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                        messages.append(
                            {
                                "role": "assistant",
                                "content": content.text,
                            }
                        )
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        # Append the new input.
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        # Responses API supports simple text inputs without chat format.
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        if isinstance(request.input, str):
            messages.append({"role": "user", "content": request.input})
        else:
            messages.extend(request.input)  # type: ignore
        return messages

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    def _construct_harmony_system_input_message(
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        self, request: ResponsesRequest, with_custom_tools: bool, tool_types: set[str]
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    ) -> OpenAIHarmonyMessage:
        reasoning_effort = request.reasoning.effort if request.reasoning else None
        enable_browser = (
            "web_search_preview" in tool_types
            and self.tool_server is not None
            and self.tool_server.has_tool("browser")
        )
        enable_code_interpreter = (
            "code_interpreter" in tool_types
            and self.tool_server is not None
            and self.tool_server.has_tool("python")
        )
        enable_container = (
            "container" in tool_types
            and self.tool_server is not None
            and self.tool_server.has_tool("container")
        )
        sys_msg = get_system_message(
            reasoning_effort=reasoning_effort,
            browser_description=(
                self.tool_server.get_tool_description("browser")
                if enable_browser and self.tool_server is not None
                else None
            ),
            python_description=(
                self.tool_server.get_tool_description("python")
                if enable_code_interpreter and self.tool_server is not None
                else None
            ),
            container_description=(
                self.tool_server.get_tool_description("container")
                if enable_container and self.tool_server is not None
                else None
            ),
            instructions=request.instructions,
            with_custom_tools=with_custom_tools,
        )
        return sys_msg

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    def _construct_input_messages_with_harmony(
        self,
        request: ResponsesRequest,
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        prev_response: ResponsesResponse | None,
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    ) -> list[OpenAIHarmonyMessage]:
        messages: list[OpenAIHarmonyMessage] = []
        if prev_response is None:
            # New conversation.
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            tool_types = extract_tool_types(request.tools)
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            with_custom_tools = has_custom_tools(tool_types)
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            sys_msg = self._construct_harmony_system_input_message(
                request, with_custom_tools, tool_types
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            )
            messages.append(sys_msg)
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            if with_custom_tools:
                dev_msg = get_developer_message(
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                    instructions=request.instructions, tools=request.tools
                )
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                messages.append(dev_msg)
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            messages += construct_harmony_previous_input_messages(request)

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        else:
            # Continue the previous conversation.
            # FIXME(woosuk): Currently, request params like reasoning and
            # instructions are ignored.
            prev_msgs = self.msg_store[prev_response.id]
            # Remove the previous chain-of-thoughts if there is a new "final"
            # message. Note that this also removes these messages from the
            # msg_store.
            if len(prev_msgs) > 0:
                last_msg = prev_msgs[-1]
                assert isinstance(last_msg, OpenAIHarmonyMessage)
                if last_msg.channel == "final":
                    prev_final_msg_idx = -1
                    for i in range(len(prev_msgs) - 2, -1, -1):
                        prev_msg_i = prev_msgs[i]
                        assert isinstance(prev_msg_i, OpenAIHarmonyMessage)
                        if prev_msg_i.channel == "final":
                            prev_final_msg_idx = i
                            break
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                    recent_turn_msgs = prev_msgs[prev_final_msg_idx + 1 :]
                    del prev_msgs[prev_final_msg_idx + 1 :]
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                    for msg in recent_turn_msgs:
                        assert isinstance(msg, OpenAIHarmonyMessage)
                        if msg.channel != "analysis":
                            prev_msgs.append(msg)
            messages.extend(prev_msgs)
        # Append the new input.
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        # Responses API supports simple text inputs without chat format.
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        if isinstance(request.input, str):
            messages.append(get_user_message(request.input))
        else:
            if prev_response is not None:
                prev_outputs = copy(prev_response.output)
            else:
                prev_outputs = []
            for response_msg in request.input:
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                messages.append(parse_response_input(response_msg, prev_outputs))
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                # User passes in a tool call request and its output. We need
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                # to add the tool call request to prev_outputs so that the
                # parse_response_input can find the tool call request when
                # parsing the tool call output.
                if isinstance(response_msg, ResponseFunctionToolCall):
                    prev_outputs.append(response_msg)
        return messages

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    async def _run_background_request_stream(
        self,
        request: ResponsesRequest,
        *args,
        **kwargs,
    ):
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        event_deque: deque[StreamingResponsesResponse] = deque()
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        new_event_signal = asyncio.Event()
        self.event_store[request.request_id] = (event_deque, new_event_signal)
        response = None
        try:
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            generator = self.responses_stream_generator(request, *args, **kwargs)
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            async for event in generator:
                event_deque.append(event)
                new_event_signal.set()  # Signal new event available
        except Exception as e:
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            logger.exception("Background request failed for %s", request.request_id)
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            response = self.create_error_response(str(e))
        finally:
            new_event_signal.set()

        if response is not None and isinstance(response, ErrorResponse):
            # If the request has failed, update the status to "failed".
            response_id = request.request_id
            async with self.response_store_lock:
                stored_response = self.response_store.get(response_id)
                assert stored_response is not None
                if stored_response.status not in ("completed", "cancelled"):
                    stored_response.status = "failed"

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    async def _run_background_request(
        self,
        request: ResponsesRequest,
        *args,
        **kwargs,
    ):
        try:
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            response = await self.responses_full_generator(request, *args, **kwargs)
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        except Exception as e:
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            logger.exception("Background request failed for %s", request.request_id)
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            response = self.create_error_response(str(e))

        if isinstance(response, ErrorResponse):
            # If the request has failed, update the status to "failed".
            response_id = request.request_id
            async with self.response_store_lock:
                stored_response = self.response_store.get(response_id)
                assert stored_response is not None
                if stored_response.status not in ("completed", "cancelled"):
                    stored_response.status = "failed"

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    async def responses_background_stream_generator(
        self,
        response_id: str,
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        starting_after: int | None = None,
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    ) -> AsyncGenerator[StreamingResponsesResponse, None]:
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        if response_id not in self.event_store:
            raise ValueError(f"Unknown response_id: {response_id}")

        event_deque, new_event_signal = self.event_store[response_id]
        start_index = 0 if starting_after is None else starting_after + 1
        current_index = start_index

        while True:
            new_event_signal.clear()

            # Yield existing events from start_index
            while current_index < len(event_deque):
                event = event_deque[current_index]
                yield event
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                if getattr(event, "type", "unknown") == "response.completed":
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                    return
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                current_index += 1

            await new_event_signal.wait()

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    async def retrieve_responses(
        self,
        response_id: str,
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        starting_after: int | None,
        stream: bool | None,
    ) -> (
        ErrorResponse
        | ResponsesResponse
        | AsyncGenerator[StreamingResponsesResponse, None]
    ):
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        async with self.response_store_lock:
            response = self.response_store.get(response_id)

        if response is None:
            return self._make_not_found_error(response_id)
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        if stream:
            return self.responses_background_stream_generator(
                response_id,
                starting_after,
            )
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        return response

    async def cancel_responses(
        self,
        response_id: str,
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    ) -> ErrorResponse | ResponsesResponse:
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        async with self.response_store_lock:
            response = self.response_store.get(response_id)
            if response is None:
                return self._make_not_found_error(response_id)

            prev_status = response.status
            if prev_status not in ("queued", "in_progress"):
                return self.create_error_response(
                    err_type="invalid_request_error",
                    message="Cannot cancel a synchronous response.",
                )

            # Update the status to "cancelled".
            response.status = "cancelled"

        # Abort the request.
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        if task := self.background_tasks.get(response_id):
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            task.cancel()
            try:
                await task
            except asyncio.CancelledError:
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                logger.exception("Background task for %s was cancelled", response_id)
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        return response

    def _make_not_found_error(self, response_id: str) -> ErrorResponse:
        return self.create_error_response(
            err_type="invalid_request_error",
            message=f"Response with id '{response_id}' not found.",
            status_code=HTTPStatus.NOT_FOUND,
        )
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    def _make_store_not_supported_error(self) -> ErrorResponse:
        return self.create_error_response(
            err_type="invalid_request_error",
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            message=(
                "`store=True` (default) is not supported. Please set "
                "`store=False` in Responses API or set "
                "`VLLM_ENABLE_RESPONSES_API_STORE=1` in the env var when "
                "starting the vLLM server."
            ),
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            status_code=HTTPStatus.BAD_REQUEST,
        )
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    async def _process_simple_streaming_events(
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        self,
        request: ResponsesRequest,
        sampling_params: SamplingParams,
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        result_generator: AsyncIterator[ConversationContext | None],
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        context: ConversationContext,
        model_name: str,
        tokenizer: AnyTokenizer,
        request_metadata: RequestResponseMetadata,
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        created_time: int,
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        _increment_sequence_number_and_return: Callable[
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            [StreamingResponsesResponse], StreamingResponsesResponse
        ],
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    ) -> AsyncGenerator[StreamingResponsesResponse, None]:
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        current_content_index = 0
        current_output_index = 0
        current_item_id = ""
        reasoning_parser = None
        if self.reasoning_parser:
            reasoning_parser = self.reasoning_parser(tokenizer)
        previous_text = ""
        previous_token_ids: list[int] = []
        first_delta_sent = False
        previous_delta_messages: list[DeltaMessage] = []
        async for ctx in result_generator:
            assert isinstance(ctx, SimpleContext)
            if ctx.last_output is None:
                continue
            if ctx.last_output.outputs:
                output = ctx.last_output.outputs[0]
                if reasoning_parser:
1184
                    delta_message = (
1185
                        reasoning_parser.extract_reasoning_content_streaming(
1186
1187
1188
1189
1190
1191
1192
                            previous_text=previous_text,
                            current_text=previous_text + output.text,
                            delta_text=output.text,
                            previous_token_ids=previous_token_ids,
                            current_token_ids=previous_token_ids + output.token_ids,
                            delta_token_ids=output.token_ids,
                        )
1193
1194
                    )
                else:
1195
1196
1197
                    delta_message = DeltaMessage(
                        content=output.text,
                    )
1198
1199
1200
1201
1202
1203
1204
                previous_text += output.text
                previous_token_ids += output.token_ids
                if not delta_message:
                    continue
                if not first_delta_sent:
                    current_item_id = str(uuid.uuid4())
                    if delta_message.reasoning_content:
1205
                        yield _increment_sequence_number_and_return(
1206
1207
1208
1209
                            ResponseOutputItemAddedEvent(
                                type="response.output_item.added",
                                sequence_number=-1,
                                output_index=current_output_index,
1210
                                item=ResponseReasoningItem(
1211
1212
1213
1214
1215
                                    type="reasoning",
                                    id=current_item_id,
                                    summary=[],
                                    status="in_progress",
                                ),
1216
1217
                            )
                        )
1218
                    else:
1219
                        yield _increment_sequence_number_and_return(
1220
1221
1222
1223
                            ResponseOutputItemAddedEvent(
                                type="response.output_item.added",
                                sequence_number=-1,
                                output_index=current_output_index,
1224
                                item=ResponseOutputMessage(
1225
1226
1227
1228
1229
1230
                                    id=current_item_id,
                                    type="message",
                                    role="assistant",
                                    content=[],
                                    status="in_progress",
                                ),
1231
1232
                            )
                        )
1233
                    yield _increment_sequence_number_and_return(
1234
                        ResponseContentPartAddedEvent(
1235
1236
1237
1238
1239
                            type="response.content_part.added",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
                            content_index=current_content_index,
1240
                            part=ResponseOutputText(
1241
1242
1243
1244
1245
                                type="output_text",
                                text="",
                                annotations=[],
                                logprobs=[],
                            ),
1246
1247
                        )
                    )
1248
1249
1250
1251
1252
1253
                    current_content_index += 1
                    first_delta_sent = True
                # todo(kebe7jun) tool call support

                # check delta message and previous delta message are
                # same as content or reasoning content
1254
1255
1256
1257
1258
                if (
                    previous_delta_messages
                    and previous_delta_messages[-1].reasoning_content is not None
                    and delta_message.content is not None
                ):
1259
1260
                    # from reasoning to normal content, send done
                    # event for reasoning
1261
1262
1263
1264
1265
                    reason_content = "".join(
                        pm.reasoning_content
                        for pm in previous_delta_messages
                        if pm.reasoning_content is not None
                    )
1266
                    yield _increment_sequence_number_and_return(
1267
1268
1269
1270
1271
1272
1273
                        ResponseReasoningTextDoneEvent(
                            type="response.reasoning_text.done",
                            item_id=current_item_id,
                            sequence_number=-1,
                            output_index=current_output_index,
                            content_index=current_content_index,
                            text=reason_content,
1274
1275
                        )
                    )
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
                    current_content_index = 0
                    reasoning_item = ResponseReasoningItem(
                        type="reasoning",
                        content=[
                            ResponseReasoningTextContent(
                                text=reason_content,
                                type="reasoning_text",
                            ),
                        ],
                        status="completed",
                        id=current_item_id,
                        summary=[],
                    )
1289
                    yield _increment_sequence_number_and_return(
1290
1291
1292
1293
1294
                        ResponseOutputItemDoneEvent(
                            type="response.output_item.done",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item=reasoning_item,
1295
1296
                        )
                    )
1297
                    yield _increment_sequence_number_and_return(
1298
                        ResponseOutputItemAddedEvent(
1299
1300
1301
                            type="response.output_item.added",
                            sequence_number=-1,
                            output_index=current_output_index,
1302
                            item=ResponseOutputMessage(
1303
1304
1305
1306
1307
1308
                                id=current_item_id,
                                type="message",
                                role="assistant",
                                content=[],
                                status="in_progress",
                            ),
1309
1310
                        )
                    )
1311
1312
                    current_output_index += 1
                    current_item_id = str(uuid.uuid4())
1313
                    yield _increment_sequence_number_and_return(
1314
                        ResponseContentPartAddedEvent(
1315
1316
1317
1318
1319
                            type="response.content_part.added",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
                            content_index=current_content_index,
1320
                            part=ResponseOutputText(
1321
1322
1323
1324
1325
                                type="output_text",
                                text="",
                                annotations=[],
                                logprobs=[],
                            ),
1326
1327
                        )
                    )
1328
1329
1330
                    current_content_index += 1
                    # reset previous delta messages
                    previous_delta_messages = []
1331

1332
                if delta_message.reasoning_content is not None:
1333
                    yield _increment_sequence_number_and_return(
1334
1335
1336
1337
1338
1339
1340
                        ResponseReasoningTextDeltaEvent(
                            type="response.reasoning_text.delta",
                            sequence_number=-1,
                            content_index=current_content_index,
                            output_index=current_output_index,
                            item_id=current_item_id,
                            delta=delta_message.reasoning_content,
1341
1342
                        )
                    )
1343
                elif delta_message.content is not None:
1344
                    yield _increment_sequence_number_and_return(
1345
                        ResponseTextDeltaEvent(
1346
1347
1348
1349
1350
1351
                            type="response.output_text.delta",
                            sequence_number=-1,
                            content_index=current_content_index,
                            output_index=current_output_index,
                            item_id=current_item_id,
                            delta=delta_message.content,
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
                            logprobs=(
                                self._create_stream_response_logprobs(
                                    token_ids=output.token_ids,
                                    logprobs=output.logprobs,
                                    tokenizer=tokenizer,
                                    top_logprobs=request.top_logprobs,
                                )
                                if request.is_include_output_logprobs()
                                else []
                            ),
1362
1363
                        )
                    )
1364
1365
1366
1367
1368
                current_content_index += 1

                previous_delta_messages.append(delta_message)
        if previous_delta_messages:
            if previous_delta_messages[-1].reasoning_content is not None:
1369
1370
1371
1372
1373
                reason_content = "".join(
                    pm.reasoning_content
                    for pm in previous_delta_messages
                    if pm.reasoning_content is not None
                )
1374
                yield _increment_sequence_number_and_return(
1375
1376
1377
1378
1379
1380
1381
                    ResponseReasoningTextDoneEvent(
                        type="response.reasoning_text.done",
                        item_id=current_item_id,
                        sequence_number=-1,
                        output_index=current_output_index,
                        content_index=current_content_index,
                        text=reason_content,
1382
1383
                    )
                )
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
                current_content_index += 1
                reasoning_item = ResponseReasoningItem(
                    type="reasoning",
                    content=[
                        ResponseReasoningTextContent(
                            text=reason_content,
                            type="reasoning_text",
                        ),
                    ],
                    status="completed",
                    id=current_item_id,
                    summary=[],
                )
1397
                yield _increment_sequence_number_and_return(
1398
1399
1400
1401
1402
                    ResponseOutputItemDoneEvent(
                        type="response.output_item.done",
                        sequence_number=-1,
                        output_index=current_output_index,
                        item=reasoning_item,
1403
1404
                    )
                )
1405
            elif previous_delta_messages[-1].content is not None:
1406
1407
1408
1409
1410
                final_content = "".join(
                    pm.content
                    for pm in previous_delta_messages
                    if pm.content is not None
                )
1411
                yield _increment_sequence_number_and_return(
1412
                    ResponseTextDoneEvent(
1413
1414
1415
1416
1417
1418
1419
                        type="response.output_text.done",
                        sequence_number=-1,
                        output_index=current_output_index,
                        content_index=current_content_index,
                        text=final_content,
                        logprobs=[],
                        item_id=current_item_id,
1420
1421
                    )
                )
1422
1423
1424
1425
1426
1427
                current_content_index += 1
                part = ResponseOutputText(
                    text=final_content,
                    type="output_text",
                    annotations=[],
                )
1428
                yield _increment_sequence_number_and_return(
1429
                    ResponseContentPartDoneEvent(
1430
1431
1432
1433
1434
1435
                        type="response.content_part.done",
                        sequence_number=-1,
                        item_id=current_item_id,
                        output_index=current_output_index,
                        content_index=current_content_index,
                        part=part,
1436
1437
                    )
                )
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
                current_content_index += 1
                item = ResponseOutputMessage(
                    type="message",
                    role="assistant",
                    content=[
                        part,
                    ],
                    status="completed",
                    id=current_item_id,
                    summary=[],
                )
1449
                yield _increment_sequence_number_and_return(
1450
1451
1452
1453
1454
                    ResponseOutputItemDoneEvent(
                        type="response.output_item.done",
                        sequence_number=-1,
                        output_index=current_output_index,
                        item=item,
1455
1456
                    )
                )
1457
1458
1459
1460
1461

    async def _process_harmony_streaming_events(
        self,
        request: ResponsesRequest,
        sampling_params: SamplingParams,
1462
        result_generator: AsyncIterator[ConversationContext | None],
1463
1464
1465
1466
1467
        context: ConversationContext,
        model_name: str,
        tokenizer: AnyTokenizer,
        request_metadata: RequestResponseMetadata,
        created_time: int,
1468
        _increment_sequence_number_and_return: Callable[
1469
1470
            [StreamingResponsesResponse], StreamingResponsesResponse
        ],
1471
    ) -> AsyncGenerator[StreamingResponsesResponse, None]:
1472
        current_content_index = -1
1473
        current_output_index = 0
1474
        current_item_id: str = ""
1475
        sent_output_item_added = False
1476
        is_first_function_call_delta = False
1477
1478
1479
1480
1481
1482
        async for ctx in result_generator:
            assert isinstance(ctx, StreamingHarmonyContext)

            if ctx.is_expecting_start():
                current_output_index += 1
                sent_output_item_added = False
1483
                is_first_function_call_delta = False
1484
1485
1486
                if len(ctx.parser.messages) > 0:
                    previous_item = ctx.parser.messages[-1]
                    if previous_item.recipient is not None:
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
                        # Deal with tool call
                        if previous_item.recipient.startswith("functions."):
                            function_name = previous_item.recipient[len("functions.") :]
                            yield _increment_sequence_number_and_return(
                                ResponseFunctionCallArgumentsDoneEvent(
                                    type="response.function_call_arguments.done",
                                    arguments=previous_item.content[0].text,
                                    name=function_name,
                                    item_id=current_item_id,
                                    output_index=current_output_index,
                                    sequence_number=-1,
                                )
                            )
                            function_call_item = ResponseFunctionToolCall(
                                type="function_call",
                                arguments=previous_item.content[0].text,
                                name=function_name,
                                item_id=current_item_id,
                                output_index=current_output_index,
                                sequence_number=-1,
                                call_id=f"fc_{random_uuid()}",
                                status="completed",
                            )
                            yield _increment_sequence_number_and_return(
                                ResponseOutputItemDoneEvent(
                                    type="response.output_item.done",
                                    sequence_number=-1,
                                    output_index=current_output_index,
                                    item=function_call_item,
                                )
                            )
1518
                    elif previous_item.channel == "analysis":
1519
1520
1521
1522
                        content = ResponseReasoningTextContent(
                            text=previous_item.content[0].text,
                            type="reasoning_text",
                        )
1523
1524
                        reasoning_item = ResponseReasoningItem(
                            type="reasoning",
1525
                            content=[content],
1526
                            status="completed",
1527
1528
                            id=current_item_id,
                            summary=[],
1529
                        )
1530
                        yield _increment_sequence_number_and_return(
1531
1532
1533
1534
1535
1536
1537
                            ResponseReasoningTextDoneEvent(
                                type="response.reasoning_text.done",
                                item_id=current_item_id,
                                sequence_number=-1,
                                output_index=current_output_index,
                                content_index=current_content_index,
                                text=previous_item.content[0].text,
1538
1539
                            )
                        )
1540
1541
1542
1543
1544
1545
1546
1547
                        yield _increment_sequence_number_and_return(
                            ResponseReasoningPartDoneEvent(
                                type="response.reasoning_part.done",
                                sequence_number=-1,
                                item_id=current_item_id,
                                output_index=current_output_index,
                                content_index=current_content_index,
                                part=content,
1548
1549
                            )
                        )
1550
                        yield _increment_sequence_number_and_return(
1551
1552
1553
1554
1555
                            ResponseOutputItemDoneEvent(
                                type="response.output_item.done",
                                sequence_number=-1,
                                output_index=current_output_index,
                                item=reasoning_item,
1556
1557
                            )
                        )
1558
1559
1560
1561
1562
1563
                    elif previous_item.channel == "final":
                        text_content = ResponseOutputText(
                            type="output_text",
                            text=previous_item.content[0].text,
                            annotations=[],
                        )
1564
                        yield _increment_sequence_number_and_return(
1565
                            ResponseTextDoneEvent(
1566
1567
1568
1569
1570
1571
1572
                                type="response.output_text.done",
                                sequence_number=-1,
                                output_index=current_output_index,
                                content_index=current_content_index,
                                text=previous_item.content[0].text,
                                logprobs=[],
                                item_id=current_item_id,
1573
1574
                            )
                        )
1575
                        yield _increment_sequence_number_and_return(
1576
1577
1578
1579
1580
1581
1582
                            ResponseContentPartDoneEvent(
                                type="response.content_part.done",
                                sequence_number=-1,
                                item_id=current_item_id,
                                output_index=current_output_index,
                                content_index=current_content_index,
                                part=text_content,
1583
1584
                            )
                        )
1585
                        yield _increment_sequence_number_and_return(
1586
                            ResponseOutputItemDoneEvent(
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
                                type="response.output_item.done",
                                sequence_number=-1,
                                output_index=current_output_index,
                                item=ResponseOutputMessage(
                                    id=current_item_id,
                                    type="message",
                                    role="assistant",
                                    content=[text_content],
                                    status="completed",
                                ),
1597
1598
                            )
                        )
1599

1600
            # stream the output of a harmony message
1601
            if ctx.parser.last_content_delta:
1602
1603
1604
1605
                if (
                    ctx.parser.current_channel == "final"
                    and ctx.parser.current_recipient is None
                ):
1606
1607
                    if not sent_output_item_added:
                        sent_output_item_added = True
1608
                        current_item_id = f"msg_{random_uuid()}"
1609
                        yield _increment_sequence_number_and_return(
1610
1611
1612
1613
                            ResponseOutputItemAddedEvent(
                                type="response.output_item.added",
                                sequence_number=-1,
                                output_index=current_output_index,
1614
                                item=ResponseOutputMessage(
1615
1616
1617
1618
1619
1620
                                    id=current_item_id,
                                    type="message",
                                    role="assistant",
                                    content=[],
                                    status="in_progress",
                                ),
1621
1622
                            )
                        )
1623
                        current_content_index += 1
1624
                        yield _increment_sequence_number_and_return(
1625
1626
1627
1628
1629
1630
                            ResponseContentPartAddedEvent(
                                type="response.content_part.added",
                                sequence_number=-1,
                                output_index=current_output_index,
                                item_id=current_item_id,
                                content_index=current_content_index,
1631
                                part=ResponseOutputText(
1632
1633
1634
1635
1636
                                    type="output_text",
                                    text="",
                                    annotations=[],
                                    logprobs=[],
                                ),
1637
1638
                            )
                        )
1639
                    yield _increment_sequence_number_and_return(
1640
                        ResponseTextDeltaEvent(
1641
1642
1643
1644
1645
1646
1647
1648
                            type="response.output_text.delta",
                            sequence_number=-1,
                            content_index=current_content_index,
                            output_index=current_output_index,
                            item_id=current_item_id,
                            delta=ctx.parser.last_content_delta,
                            # TODO, use logprobs from ctx.last_request_output
                            logprobs=[],
1649
1650
1651
1652
1653
1654
                        )
                    )
                elif (
                    ctx.parser.current_channel == "analysis"
                    and ctx.parser.current_recipient is None
                ):
1655
1656
                    if not sent_output_item_added:
                        sent_output_item_added = True
1657
                        current_item_id = f"msg_{random_uuid()}"
1658
                        yield _increment_sequence_number_and_return(
1659
1660
1661
1662
                            ResponseOutputItemAddedEvent(
                                type="response.output_item.added",
                                sequence_number=-1,
                                output_index=current_output_index,
1663
                                item=ResponseReasoningItem(
1664
1665
1666
1667
1668
                                    type="reasoning",
                                    id=current_item_id,
                                    summary=[],
                                    status="in_progress",
                                ),
1669
1670
                            )
                        )
1671
                        current_content_index += 1
1672
                        yield _increment_sequence_number_and_return(
1673
1674
                            ResponseReasoningPartAddedEvent(
                                type="response.reasoning_part.added",
1675
1676
1677
1678
                                sequence_number=-1,
                                output_index=current_output_index,
                                item_id=current_item_id,
                                content_index=current_content_index,
1679
                                part=ResponseReasoningTextContent(
1680
                                    text="",
1681
                                    type="reasoning_text",
1682
                                ),
1683
1684
                            )
                        )
1685
                    yield _increment_sequence_number_and_return(
1686
1687
1688
1689
1690
1691
1692
                        ResponseReasoningTextDeltaEvent(
                            type="response.reasoning_text.delta",
                            item_id=current_item_id,
                            output_index=current_output_index,
                            content_index=current_content_index,
                            delta=ctx.parser.last_content_delta,
                            sequence_number=-1,
1693
1694
                        )
                    )
1695
1696
1697
                # built-in tools will be triggered on the analysis channel
                # However, occasionally built-in tools will
                # still be output to commentary.
1698
1699
1700
1701
                elif (
                    ctx.parser.current_channel == "commentary"
                    or ctx.parser.current_channel == "analysis"
                ) and ctx.parser.current_recipient == "python":
1702
1703
                    if not sent_output_item_added:
                        sent_output_item_added = True
1704
                        current_item_id = f"tool_{random_uuid()}"
1705
                        yield _increment_sequence_number_and_return(
1706
1707
1708
1709
                            ResponseOutputItemAddedEvent(
                                type="response.output_item.added",
                                sequence_number=-1,
                                output_index=current_output_index,
1710
                                item=ResponseCodeInterpreterToolCallParam(
1711
1712
1713
1714
1715
1716
1717
                                    type="code_interpreter_call",
                                    id=current_item_id,
                                    code=None,
                                    container_id="auto",
                                    outputs=None,
                                    status="in_progress",
                                ),
1718
1719
                            )
                        )
1720
                        yield _increment_sequence_number_and_return(
1721
                            ResponseCodeInterpreterCallInProgressEvent(
1722
                                type="response.code_interpreter_call.in_progress",
1723
1724
1725
                                sequence_number=-1,
                                output_index=current_output_index,
                                item_id=current_item_id,
1726
1727
                            )
                        )
1728
                    yield _increment_sequence_number_and_return(
1729
1730
1731
1732
1733
1734
                        ResponseCodeInterpreterCallCodeDeltaEvent(
                            type="response.code_interpreter_call_code.delta",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
                            delta=ctx.parser.last_content_delta,
1735
1736
                        )
                    )
1737
1738

            # stream tool call outputs
1739
1740
            if ctx.is_assistant_action_turn() and len(ctx.parser.messages) > 0:
                previous_item = ctx.parser.messages[-1]
1741
1742
1743
1744
1745
1746
1747
                if (
                    self.tool_server is not None
                    and self.tool_server.has_tool("browser")
                    and previous_item.recipient is not None
                    and previous_item.recipient.startswith("browser.")
                ):
                    function_name = previous_item.recipient[len("browser.") :]
1748
1749
1750
                    action = None
                    parsed_args = json.loads(previous_item.content[0].text)
                    if function_name == "search":
1751
                        action = response_function_web_search.ActionSearch(
1752
1753
                            type="search",
                            query=parsed_args["query"],
1754
                        )
1755
                    elif function_name == "open":
1756
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                        action = response_function_web_search.ActionOpenPage(
                            type="open_page",
                            # TODO: translate to url
                            url=f"cursor:{parsed_args.get('cursor', '')}",
                        )
1761
                    elif function_name == "find":
1762
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                        action = response_function_web_search.ActionFind(
                            type="find",
                            pattern=parsed_args["pattern"],
                            # TODO: translate to url
                            url=f"cursor:{parsed_args.get('cursor', '')}",
                        )
1768
                    else:
1769
                        raise ValueError(f"Unknown function name: {function_name}")
1770

1771
                    current_item_id = f"tool_{random_uuid()}"
1772
                    yield _increment_sequence_number_and_return(
1773
                        ResponseOutputItemAddedEvent(
1774
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1776
                            type="response.output_item.added",
                            sequence_number=-1,
                            output_index=current_output_index,
1777
                            item=response_function_web_search.ResponseFunctionWebSearch(
1778
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                                # TODO: generate a unique id for web search call
                                type="web_search_call",
                                id=current_item_id,
                                action=action,
                                status="in_progress",
                            ),
1784
1785
                        )
                    )
1786
                    yield _increment_sequence_number_and_return(
1787
1788
1789
1790
1791
                        ResponseWebSearchCallInProgressEvent(
                            type="response.web_search_call.in_progress",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
1792
1793
                        )
                    )
1794
                    yield _increment_sequence_number_and_return(
1795
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                        ResponseWebSearchCallSearchingEvent(
                            type="response.web_search_call.searching",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
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1801
                        )
                    )
1802
1803

                    # enqueue
1804
                    yield _increment_sequence_number_and_return(
1805
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                        ResponseWebSearchCallCompletedEvent(
                            type="response.web_search_call.completed",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
1810
1811
                        )
                    )
1812
                    yield _increment_sequence_number_and_return(
1813
                        ResponseOutputItemDoneEvent(
1814
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1816
                            type="response.output_item.done",
                            sequence_number=-1,
                            output_index=current_output_index,
1817
                            item=ResponseFunctionWebSearch(
1818
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                                type="web_search_call",
                                id=current_item_id,
                                action=action,
                                status="completed",
                            ),
1823
1824
                        )
                    )
1825

1826
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1829
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                if (
                    self.tool_server is not None
                    and self.tool_server.has_tool("python")
                    and previous_item.recipient is not None
                    and previous_item.recipient.startswith("python")
                ):
1832
                    yield _increment_sequence_number_and_return(
1833
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1837
                        ResponseCodeInterpreterCallCodeDoneEvent(
                            type="response.code_interpreter_call_code.done",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
1838
                            code=previous_item.content[0].text,
1839
1840
                        )
                    )
1841
                    yield _increment_sequence_number_and_return(
1842
1843
1844
1845
1846
                        ResponseCodeInterpreterCallInterpretingEvent(
                            type="response.code_interpreter_call.interpreting",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
1847
1848
                        )
                    )
1849
                    yield _increment_sequence_number_and_return(
1850
1851
1852
1853
1854
                        ResponseCodeInterpreterCallCompletedEvent(
                            type="response.code_interpreter_call.completed",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item_id=current_item_id,
1855
1856
                        )
                    )
1857
                    yield _increment_sequence_number_and_return(
1858
                        ResponseOutputItemDoneEvent(
1859
1860
1861
                            type="response.output_item.done",
                            sequence_number=-1,
                            output_index=current_output_index,
1862
                            item=ResponseCodeInterpreterToolCallParam(
1863
1864
1865
1866
1867
1868
1869
1870
                                type="code_interpreter_call",
                                id=current_item_id,
                                code=previous_item.content[0].text,
                                container_id="auto",
                                # TODO: add outputs here
                                outputs=[],
                                status="completed",
                            ),
1871
1872
                        )
                    )
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
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1893
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1897
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1899
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1901
1902
1903
1904
1905
1906
1907
1908
1909
            # developer tools will be triggered on the commentary channel
            # and recipient starts with "functions.TOOL_NAME"
            if (
                ctx.parser.current_channel == "commentary"
                and ctx.parser.current_recipient
                and ctx.parser.current_recipient.startswith("functions.")
            ):
                if is_first_function_call_delta is False:
                    is_first_function_call_delta = True
                    fc_name = ctx.parser.current_recipient[len("functions.") :]
                    tool_call_item = ResponseFunctionToolCall(
                        name=fc_name,
                        type="function_call",
                        id=current_item_id,
                        call_id=f"call_{random_uuid()}",
                        arguments="",
                        status="in_progress",
                    )
                    current_item_id = f"fc_{random_uuid()}"
                    yield _increment_sequence_number_and_return(
                        ResponseOutputItemAddedEvent(
                            type="response.output_item.added",
                            sequence_number=-1,
                            output_index=current_output_index,
                            item=tool_call_item,
                        )
                    )
                else:
                    yield _increment_sequence_number_and_return(
                        ResponseFunctionCallArgumentsDeltaEvent(
                            item_id=current_item_id,
                            delta=ctx.parser.last_content_delta,
                            output_index=current_output_index,
                            sequence_number=-1,
                            type="response.function_call_arguments.delta",
                        )
                    )
1910

1911
1912
1913
1914
    async def responses_stream_generator(
        self,
        request: ResponsesRequest,
        sampling_params: SamplingParams,
1915
        result_generator: AsyncIterator[ConversationContext | None],
1916
1917
1918
1919
        context: ConversationContext,
        model_name: str,
        tokenizer: AnyTokenizer,
        request_metadata: RequestResponseMetadata,
1920
        created_time: int | None = None,
1921
    ) -> AsyncGenerator[StreamingResponsesResponse, None]:
1922
1923
1924
1925
1926
        # TODO:
        # 1. Handle disconnect

        created_time = created_time or int(time.time())

1927
1928
        sequence_number = 0

1929
        def _increment_sequence_number_and_return(
1930
            event: StreamingResponsesResponse,
1931
        ) -> StreamingResponsesResponse:
1932
1933
            nonlocal sequence_number
            # Set sequence_number if the event has this attribute
1934
            if hasattr(event, "sequence_number"):
1935
1936
                event.sequence_number = sequence_number
            sequence_number += 1
1937
            return event
1938

1939
        async with AsyncExitStack() as exit_stack:
1940
1941
            processer = None
            if self.use_harmony:
1942
1943
                # TODO: in streaming, we noticed this bug:
                # https://github.com/vllm-project/vllm/issues/25697
1944
                await self._initialize_tool_sessions(request, context, exit_stack)
1945
1946
1947
                processer = self._process_harmony_streaming_events
            else:
                processer = self._process_simple_streaming_events
1948
            # TODO Hanchen make sampling params to include the structural tag
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958

            initial_response = ResponsesResponse.from_request(
                request,
                sampling_params,
                model_name=model_name,
                created_time=created_time,
                output=[],
                status="in_progress",
                usage=None,
            ).model_dump()
1959
            yield _increment_sequence_number_and_return(
1960
1961
1962
1963
                ResponseCreatedEvent(
                    type="response.created",
                    sequence_number=-1,
                    response=initial_response,
1964
1965
                )
            )
1966
            yield _increment_sequence_number_and_return(
1967
1968
1969
1970
                ResponseInProgressEvent(
                    type="response.in_progress",
                    sequence_number=-1,
                    response=initial_response,
1971
1972
                )
            )
1973

1974
            async for event_data in processer(
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
                request,
                sampling_params,
                result_generator,
                context,
                model_name,
                tokenizer,
                request_metadata,
                created_time,
                _increment_sequence_number_and_return,
            ):
1985
                yield event_data
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002

            async def empty_async_generator():
                # A hack to trick Python to think this is a generator but
                # in fact it immediately returns.
                if False:
                    yield

            final_response = await self.responses_full_generator(
                request,
                sampling_params,
                empty_async_generator(),
                context,
                model_name,
                tokenizer,
                request_metadata,
                created_time=created_time,
            )
2003
            yield _increment_sequence_number_and_return(
2004
                ResponseCompletedEvent(
2005
2006
                    type="response.completed",
                    sequence_number=-1,
2007
                    response=final_response,
2008
2009
                )
            )