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end-of-speech-integration

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Add or modify end-of-speech integrations in assistant-api with strict separation from VAD internals. Use for transcript/audio/history-aware turn-finalization logic, provider wiring, and EOS UI config.

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End Of Speech Integration Skill

Mission

Implement EOS that finalizes each user turn exactly once, at low latency, without mutating VAD behavior.

Hard boundaries

In scope:

  • api/assistant-api/internal/end_of_speech/internal/<provider>/...
  • api/assistant-api/internal/end_of_speech/end_of_speech.go (factory registration)
  • api/assistant-api/internal/type/end_of_speech.go and packet compatibility only if required
  • EOS config in ui/src/providers/<provider>/eos.json (plus optional model-options.json)
  • EOS UI rendering under ui/src/app/components/providers/end-of-speech/

Out of scope:

  • api/assistant-api/internal/vad/internal/... implementation changes
  • api/assistant-api/internal/vad/vad.go provider logic changes
  • STT/TTS/telephony provider implementation changes

Inputs expected from user

  1. EOS signal mode: transcript-only, audio-model, or history-aware model.
  2. Priority: lower latency or lower false-finalization.
  3. Any deployment/model constraints.

If user does not answer:

  • Use transcript-only (silence_based_eos) for text/STT driven flows.
  • Keep defaults for threshold, quick_timeout, silence_timeout.

Packet contract

Accepted packet inputs depend on provider strategy:

  • transcript flow: SpeechToTextPacket, UserTextPacket
  • timing/reset flow: InterruptionPacket, VadSpeechActivityPacket
  • model-aware flow: optional UserAudioPacket, LLMResponseDonePacket

Required outputs:

  • InterimEndOfSpeechPacket
  • EndOfSpeechPacket (once per utterance)
  • ConversationEventPacket{Name:"eos", ...}

Implementation workflow

  1. Choose baseline provider to clone:
  • transcript timer: internal/silence_based/...
  • audio smart-turn: internal/pipecat/...
  • history/model-aware: internal/livekit/...
  1. Add new provider package under internal/<provider>/.
  2. Register provider constant and switch case in end_of_speech.go.
  3. Ensure interim/final packet ordering is stable and deduplicated.
  4. Add/update EOS UI config JSON and component mapping.
  5. Add tests for interruption, interim reset, timeout, and duplicate-final guard.

Done criteria

  • Provider selectable via microphone.eos.provider.
  • No edits under api/assistant-api/internal/vad/internal/.
  • Final EOS emitted once per turn in tests.
  • Config loads via ui/src/providers/config-loader.ts path resolution.

Validation commands

  • go test ./api/assistant-api/internal/end_of_speech/...
  • go test ./api/assistant-api/internal/adapters/internal/...
  • cd ui && yarn test providers
  • ./.claude/skills/end-of-speech-integration/scripts/validate.sh --check-diff --provider <provider>