Debugging Voice Agents: How to Know if Your STT, LLM, or TTS Is the Problem

Something went wrong. The agent said something bizarre, or paused for three seconds, or completely misunderstood the user. The real question is: which layer broke? The answer isn't obvious, and guessing is expensive. Here is the thing about debugging a voice agent that nobody warns you about upfront: failures are almost never where you think they are. A voice agent that gives a wrong answer isn't necessarily an LLM problem. A voice agent that sounds robotic isn't necessarily a TTS problem. A voi