fix: return error to LLM for unknown function calls in voice path#4938
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kollaikal-rupesh wants to merge 1 commit intolivekit:mainfrom
Open
fix: return error to LLM for unknown function calls in voice path#4938kollaikal-rupesh wants to merge 1 commit intolivekit:mainfrom
kollaikal-rupesh wants to merge 1 commit intolivekit:mainfrom
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When the LLM calls a function not registered in the tool context, the voice path silently skips it with `continue`, leaving tool_output.output empty. This causes the agent to stop responding entirely since the downstream code in agent_activity.py only retriggers the LLM when tool outputs are present. Return a FunctionCallResult with is_error=True (via make_tool_output) so the LLM receives the error and can recover gracefully. This matches the existing behavior in llm/utils.py and the validation error handler already present in the same function. Fixes livekit#4933
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Fixes #4933
The voice path in
generation.pysilently drops unknown function calls withcontinue, leavingtool_output.outputempty. This causes the agent to stop responding sinceagent_activity.pyonly retriggers the LLM when tool outputs are present.Now returns a
FunctionCallResultwithis_error=Trueviamake_tool_output, matching the existing pattern inllm/utils.pyand the validation error handler in the same function.