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stt-integration

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Add or modify speech-to-text providers in assistant-api with transport-aware ingestion (WS/SDK/HTTP), transcript packet correctness, and UI/provider wiring.

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STT Integration Skill

Mission

Integrate STT providers that emit reliable interim/final transcripts, interruption signaling, and stt_latency_ms metrics.

Inputs expected from user

  1. Ingestion model: streaming WebSocket, SDK callback stream, or HTTP chunk/segment submit.
  2. Interim transcript support required or final-only acceptable.
  3. Required language/model controls.

If user does not answer:

  • Follow nearest streaming baseline and preserve current transcript packet semantics.

Hard boundaries

In scope:

  • api/assistant-api/internal/transformer/<provider>/stt.go (+ provider option/callback helpers)
  • api/assistant-api/internal/transformer/transformer.go
  • optional contract updates: api/assistant-api/internal/type/stt_transformer.go, packet.go
  • provider STT JSON + UI config files/components

Out of scope:

  • TTS-only transport changes
  • telephony channel implementation
  • EOS/VAD algorithm changes

Transport mapping

  • WS callback baseline: deepgram, assembly-ai, sarvam
  • SDK baseline: azure, google, aws
  • HTTP/other baseline: provider-specific fallback keeping packet contract

Packet contract

Input:

  • UserAudioPacket

Required outputs:

  • SpeechToTextPacket (interim/final)
  • InterruptionPacket{Source:"word"} when provider exposes speech-onset word signal
  • ConversationEventPacket{Name:"stt", ...}
  • MessageMetricPacket{Name:"stt_latency_ms"} per utterance

Implementation workflow

  1. Select baseline provider by transport.
  2. Implement STT in provider folder and callback/parser helpers.
  3. Register provider in STT factory switch.
  4. Wire UI model/language metadata and provider form.
  5. Validate partial/final ordering and context IDs.
  6. Add tests for init, interim/final, reconnect/retry, latency metric.

Validation commands

  • go test ./api/assistant-api/internal/transformer/... -run TestSTT
  • go test ./api/assistant-api/internal/transformer/<provider>/...
  • cd ui && yarn test providers
  • ./.claude/skills/stt-integration/scripts/validate.sh --check-diff --provider <provider>