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fix: return error ToolOutput on unknown tools #4352

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fix: return error ToolOutput on unknown tools #4352

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20 changes: 20 additions & 0 deletions livekit-agents/livekit/agents/voice/generation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -467,13 +467,33 @@ def _tool_completed(out: ToolExecutionOutput) -> None:
# TODO(theomonnom): assert other tool_choice values

if (function_tool := tool_ctx.function_tools.get(fnc_call.name)) is None:
available_tools = list(tool_ctx.function_tools.keys())
tools_list = ", ".join(available_tools) if available_tools else "none"

error_message = f"Unknown tool '{fnc_call.name}'. Available tools: {tools_list}"

logger.warning(
f"unknown AI function `{fnc_call.name}`",
extra={
"function": fnc_call.name,
"speech_id": speech_handle.id,
},
)

_tool_completed(
ToolExecutionOutput(
fnc_call=fnc_call.model_copy(),
fnc_call_out=llm.FunctionCallOutput(
name=fnc_call.name,
call_id=fnc_call.call_id,
output=error_message,
is_error=True,
),
agent_task=None,
raw_output=None,
raw_exception=None,
)
)
continue

if not is_function_tool(function_tool) and not is_raw_function_tool(function_tool):
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