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fix(voice): make function call history preservation configurable in AgentTask #5288

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fix(voice): make function call history preservation configurable in AgentTask #5288

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6 changes: 5 additions & 1 deletion livekit-agents/livekit/agents/voice/agent.py
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Original file line number Diff line number Diff line change
Expand Up @@ -700,6 +700,7 @@ def __init__(
llm: NotGivenOr[llm.LLM | llm.RealtimeModel | None] = NOT_GIVEN,
tts: NotGivenOr[tts.TTS | None] = NOT_GIVEN,
mcp_servers: NotGivenOr[list[mcp.MCPServer] | None] = NOT_GIVEN,
preserve_function_call_history: bool = False,
# deprecated
turn_detection: NotGivenOr[TurnDetectionMode | None] = NOT_GIVEN,
allow_interruptions: NotGivenOr[bool] = NOT_GIVEN,
Expand Down Expand Up @@ -733,6 +734,7 @@ def __init__(
self.__fut = asyncio.Future[TaskResult_T]()
self.__inactive_ev = asyncio.Event()
self.__inactive_ev.set() # set when the agent is not awaited or activity is closed
self._preserve_function_call_history = preserve_function_call_history

self._old_agent: Agent | None = None

Expand Down Expand Up @@ -892,7 +894,9 @@ def _handle_task_done(_: asyncio.Task[Any]) -> None:
run_state._watch_handle(speech_handle)

merged_chat_ctx = old_agent.chat_ctx.merge(
self.chat_ctx, exclude_function_call=True, exclude_instructions=True
self.chat_ctx,
exclude_function_call=not self._preserve_function_call_history,
exclude_instructions=True,
)
# set the chat_ctx directly, `session._update_activity` will sync it to the rt_session if needed
old_agent._chat_ctx.items[:] = merged_chat_ctx.items
Expand Down
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