The STT-failure enrichment templates injected setup instructions —
"no STT provider is configured", "a direct message has already been
sent", and a "hermes-agent-setup" skill mention — into the LLM-visible
prompt. That text persists in conversation history, so after one STT
failure the model kept volunteering Whisper/Vosk setup advice on every
later voice turn, even after transcription started working (observed in
prod on gpt-5-nano). The gateway also fired a hardcoded English notice
via _stt_adapter.send(), producing a second, wrong-language reply that
TTS then spoke aloud.
- Neutralize all enrichment templates: success passes the transcript
through as a plain quoted line; every failure branch emits a single
[voice message could not be transcribed] marker.
- Move the operator-facing failure cause to logger.info so it stays
diagnosable in container logs without leaking into the prompt.
- Remove the hardcoded English _stt_adapter.send() notice; the LLM now
produces one coherent reply in the user's language.
- Update the gateway STT tests to assert the neutral contract.
Co-authored-by: Hermes Agent <noreply@nousresearch.com>
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