macOS already has some great intrinsic TTS capability as the OS seems to include a naturally sounding voice. I recently built a similar tool to just run the "say" command as a background process. Had to wrap it in a Deno server. It works, but with Tahoe it's difficult to consistently configure using that one natural voice, and not the subpar voices downloadable in the settings. The good voice seems to be hidden somehow.

Funny! I made one recently too using piper-tts! https://github.com/tylerdavis/speak-mcp

I just setup pushover to send a message to my phone for this exact reason! Trying out your server next!