@langwatch/scenario
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    Variable ELEVENLABS_DEFAULT_VOICE_IDConst

    ELEVENLABS_DEFAULT_VOICE_ID: "EXAVITQu4vr4xnSDxMaL"

    Sarah — premade EL voice, free-tier accessible as of 2026-05. Other premade voices (e.g. Rachel 21m00Tcm4TlvDq8ikWAM) returned 402 paid_plan_required from the EL TTS API. Override via ELEVENLABS_VOICE_ID env or the voice constructor argument.