Agent, Voices, Voice agents.
First I worked through You Should Write An Agent, then I rewrote it in golang with more tools. It is amazing how powerful and simple this is. I gave it psql access, and it can debug Postgres. I gave it nmap and shell access, and it can start finding network vulnerabilities. This is pretty great.
I also tried setting up a realtime voice agent doing talkie toaster. This is also pretty great, and its much more responsive than other voice agents. However, it needs some tool calling to be useful.