It's a library for C / Micropython / AtomVM, so you could send the result over a lora radio, ESPNOW, WAN, match it in a switch statement to activate a relay, draw on the LCD.. that's up to you.
Many ESP32S3 dev boards have a microphone and speaker header available conveniently on the board, so I have been using that to respond via Babytalk's text to speech capability.
I'll improve the README to make it a little more clear.
Thank you for the explaination. So it is a library and would require someone to adjust it to their use case. That's what got me confused: wide open use case, but nothing tangible. I mean, if an ESP device is doing STT+TTS, then what am I supposed to be talking to? But if it is an ESP device that can do ANY->TTS and/or STT->ANY with some code customization needed, then I think I get it.