The mind (chat backend/model) decides, reasons, and runs tools → a draft; the mouth
re-voices that draft in her character. Default: no mouth configured → the mind's
draft IS the reply, bit-for-bit the old behavior (and old streaming path untouched).
- config: MOUTH_BACKEND / MOUTH_MODEL. The slot for an eventual fine-tuned voice.
- chat: _mind_loop (tool/generation loop, non-stream, returns draft + tools_run),
_voice_pass / mind.voice_messages (re-voice the draft, keep every fact/number),
_mouth_target (active only when configured AND != mind). respond + respond_stream
branch: mouth off = stream the mind directly (unchanged); mouth on = mind decides
+ runs tools, then the mouth streams the re-voiced reply. Falls back to the draft
on any mouth failure (chat never breaks).
- Key payoff: the mouth needs no tool support (the mind handles tools), so it can be
a non-tool character model (Dolphin / Claude / fine-tune). Makes the fine-tune
easy: teach a small model to *sound* like Lyra, not to be smart.
- tests: mouth target on/off, voice_messages shape, voice_pass revoice+fallback.
Suite 96 green, ruff clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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