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fix(vertex_ai realtime): keep VAD enabled when guardrails inject create_response: False

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map_automatic_turn_detection sets disabled=True whenever create_response is
absent OR False. Transcription guardrails inject create_response: False to
suppress auto-responses while expecting VAD to stay active, but the previous
override in _build_vertex_ai_setup_config only fired when create_response was
absent, leaving disabled=True and silently breaking speech detection and
transcription events. Vertex Live has no 'VAD on, no auto-response' mode, so
always keep VAD active in the setup config.

Co-authored-by: Yassin Kortam <yassin@berri.ai>
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Cursor Agent 2026-05-22 19:06:38 +00:00
parent 6f45b5df06
commit 8cf3f4eda1
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1 changed files with 9 additions and 6 deletions
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15
litellm/llms/vertex_ai/realtime/transformation.py
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@ -178,16 +178,19 @@ class VertexAIRealtimeConfig(GeminiRealtimeConfig):
# Ensure Vertex defaults for realtimeInputConfig apply even when
# the client provided a partial ``turn_detection`` (e.g. only
# ``silence_duration_ms``). ``map_openai_params`` defaults
# ``disabled=True`` when ``create_response`` is absent, which would
# otherwise silently disable VAD here.
# ``silence_duration_ms``). ``map_automatic_turn_detection`` sets
# ``disabled=True`` whenever ``create_response`` is absent or
# ``False`` — the latter being how transcription guardrails
# suppress automatic responses — which would otherwise silently
# disable VAD here and break speech detection / transcription
# events. Vertex Live has no "VAD on, no auto-response" mode, so
# always keep VAD active; ``create_response: True`` already maps
# to ``disabled=False`` and is therefore unaffected.
realtime_input_config = setup_config.setdefault("realtimeInputConfig", {})
automatic_detection = realtime_input_config.setdefault(
"automaticActivityDetection", {}
)
client_turn_detection = self._extract_turn_detection(session_params) or {}
if "create_response" not in client_turn_detection:
automatic_detection["disabled"] = False
automatic_detection["disabled"] = False
automatic_detection.setdefault("silenceDurationMs", 800)
setup_config.setdefault("inputAudioTranscription", {})