Add local-handoff-two-agents-tts example
Variant of the local handoff example with per-task TTS voices. Each child task wraps the LLM with its own `CartesiaTTSService` in a custom pipeline override, so the main task has no TTS and audio comes from whichever child is active over the bus.
This commit is contained in:
Aleix Conchillo Flaqué
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#
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# Copyright (c) 2026, Daily
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#
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# SPDX-License-Identifier: BSD 2-Clause License
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#
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"""Two LLM tasks with per-task TTS voices.
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Same shape as ``local-handoff-two-agents.py``, but each child task
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runs its own TTS with a distinct voice. The main task has no TTS —
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audio comes from the child tasks via the bus and is played by the
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main task's transport. Tasks announce the transfer ("let me connect
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you with...") before handing off.
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Architecture::
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Main task (no TTS):
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transport.in → STT → user_agg → BusBridge → transport.out → assistant_agg
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Child task (with TTS):
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bridge_in → LLM → TTS → bridge_out
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Requirements:
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- OPENAI_API_KEY
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- DEEPGRAM_API_KEY
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- CARTESIA_API_KEY
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- DAILY_API_KEY (for Daily transport)
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"""
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import os
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from dotenv import load_dotenv
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from loguru import logger
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from pipecat.audio.vad.silero import SileroVADAnalyzer
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from pipecat.bus import BusBridgeProcessor
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from pipecat.pipeline.pipeline import Pipeline
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from pipecat.pipeline.runner import PipelineRunner
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from pipecat.pipeline.task import PipelineParams, PipelineTask
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from pipecat.processors.aggregators.llm_context import LLMContext
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from pipecat.processors.aggregators.llm_response_universal import (
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LLMContextAggregatorPair,
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LLMUserAggregatorParams,
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)
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from pipecat.runner.types import RunnerArguments
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from pipecat.runner.utils import create_transport
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from pipecat.services.cartesia.tts import CartesiaTTSService
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from pipecat.services.deepgram.stt import DeepgramSTTService
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from pipecat.services.llm_service import FunctionCallParams
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from pipecat.services.openai.llm import OpenAILLMService
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from pipecat.tasks.llm import LLMTask, LLMTaskActivationArgs, tool
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from pipecat.transports.base_transport import BaseTransport, TransportParams
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from pipecat.transports.daily.transport import DailyParams
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load_dotenv(override=True)
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MAIN_NAME = "acme"
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transport_params = {
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"daily": lambda: DailyParams(
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audio_in_enabled=True,
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audio_out_enabled=True,
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),
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"webrtc": lambda: TransportParams(
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audio_in_enabled=True,
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audio_out_enabled=True,
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),
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}
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class AcmeTTSTask(LLMTask):
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"""Child task with its own LLM + TTS, bridged to the main task.
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Each child wraps the standard ``Pipeline([llm])`` with an extra
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TTS processor so audio is produced locally by each child and
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shipped to the main task over the bus.
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"""
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def __init__(self, name: str, *, llm: OpenAILLMService, voice_id: str):
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"""Initialize the child task.
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Args:
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name: Unique task name.
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llm: The LLM service for this child.
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voice_id: Cartesia voice id for this child's TTS.
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"""
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tts = CartesiaTTSService(
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api_key=os.environ["CARTESIA_API_KEY"],
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settings=CartesiaTTSService.Settings(voice=voice_id),
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)
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super().__init__(
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name,
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llm=llm,
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pipeline=Pipeline([llm, tts]),
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bridged=(),
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)
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@tool(cancel_on_interruption=False)
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async def transfer_to_agent(self, params: FunctionCallParams, agent: str, reason: str):
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"""Transfer the user to another agent.
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Args:
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agent (str): The agent to transfer to (e.g. 'greeter', 'support').
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reason (str): Why the user is being transferred.
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"""
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logger.info(f"Task '{self.name}': transferring to '{agent}' ({reason})")
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await self.handoff_to(
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agent,
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messages=[
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{
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"role": "developer",
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"content": f"Tell the user about the transfer ({reason}).",
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}
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],
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activation_args=LLMTaskActivationArgs(
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messages=[{"role": "developer", "content": reason}],
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),
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result_callback=params.result_callback,
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)
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@tool
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async def end_conversation(self, params: FunctionCallParams, reason: str):
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"""End the conversation when the user says goodbye.
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Args:
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reason (str): Why the conversation is ending.
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"""
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logger.info(f"Task '{self.name}': ending conversation ({reason})")
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await self.end(
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reason=reason,
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messages=[{"role": "developer", "content": reason}],
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result_callback=params.result_callback,
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)
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def _build_greeter() -> AcmeTTSTask:
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"""Greeter: routes the user to support when they pick a product."""
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llm = OpenAILLMService(
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api_key=os.environ["OPENAI_API_KEY"],
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settings=OpenAILLMService.Settings(
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system_instruction=(
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"You are a friendly greeter for Acme Corp. The available products "
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"are: the Acme Rocket Boots, the Acme Invisible Paint, and the Acme "
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"Tornado Kit. Ask which one they'd like to learn more about. "
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"When the user picks a product or asks a question about one, "
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"call the transfer_to_agent tool with agent 'support'. "
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"Do not answer product questions yourself. If the user says goodbye, "
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"call the end_conversation tool. Keep responses brief — this is a "
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"voice conversation."
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),
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),
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)
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return AcmeTTSTask(
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"greeter",
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llm=llm,
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voice_id="9626c31c-bec5-4cca-baa8-f8ba9e84c8bc", # Jacqueline
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)
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def _build_support() -> AcmeTTSTask:
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"""Support: answers product questions, can hand back to the greeter."""
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llm = OpenAILLMService(
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api_key=os.environ["OPENAI_API_KEY"],
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settings=OpenAILLMService.Settings(
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system_instruction=(
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"You are a support agent for Acme Corp. You know about three "
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"products: Acme Rocket Boots (jet-powered boots, $299, run up "
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"to 60 mph), Acme Invisible Paint (makes anything invisible for "
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"24 hours, $49 per can), and Acme Tornado Kit (portable tornado "
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"generator, $199, batteries included). Answer the user's questions "
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"about these products. If the user wants to browse other products "
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"or start over, call the transfer_to_agent tool with agent "
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"'greeter'. If the user says goodbye, call the end_conversation "
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"tool. Keep responses brief — this is a voice conversation."
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),
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),
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)
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return AcmeTTSTask(
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"support",
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llm=llm,
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voice_id="a167e0f3-df7e-4d52-a9c3-f949145efdab", # Blake
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)
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async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
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logger.info("Starting two-agents-with-tts bot")
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runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)
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stt = DeepgramSTTService(api_key=os.environ["DEEPGRAM_API_KEY"])
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context = LLMContext()
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aggregators = LLMContextAggregatorPair(
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context,
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user_params=LLMUserAggregatorParams(vad_analyzer=SileroVADAnalyzer()),
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)
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# The main task has no TTS. Audio comes from the children over
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# the bus; the main bridge tees user context out and pushes
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# incoming audio/text frames back into the local pipeline.
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bridge = BusBridgeProcessor(
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bus=runner.bus,
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task_name=MAIN_NAME,
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name=f"{MAIN_NAME}::BusBridge",
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)
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pipeline = Pipeline(
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[
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transport.input(),
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stt,
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aggregators.user(),
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bridge,
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transport.output(),
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aggregators.assistant(),
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]
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)
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task = PipelineTask(
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pipeline,
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name=MAIN_NAME,
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params=PipelineParams(
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enable_metrics=True,
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enable_usage_metrics=True,
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),
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idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
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)
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await runner.spawn(_build_greeter())
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await runner.spawn(_build_support())
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@transport.event_handler("on_client_connected")
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async def on_client_connected(transport, client):
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logger.info("Client connected")
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await task.activate_task(
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"greeter",
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args=LLMTaskActivationArgs(
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messages=[
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{
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"role": "developer",
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"content": (
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"Welcome the user to Acme Corp, mention the available products "
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"and ask how you can help."
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),
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},
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],
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),
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)
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@transport.event_handler("on_client_disconnected")
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async def on_client_disconnected(transport, client):
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logger.info("Client disconnected")
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await task.cancel()
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await runner.run(task)
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async def bot(runner_args: RunnerArguments):
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"""Main bot entry point compatible with Pipecat Cloud."""
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transport = await create_transport(runner_args, transport_params)
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await run_bot(transport, runner_args)
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if __name__ == "__main__":
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from pipecat.runner.run import main
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main()
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