I use the one that I've been developing since 2023. It's intended to be used in exactly this spirit! Written in Go, has image support (which has yet to be fleshed out).

It supports MCP (unlike Pi), sandboxing (with user-mode networking), and runs efficiently at huge contexts.

https://codeberg.org/mlow/lmcli

(The screenshot in the folder is a little bit out of date, but is still representative of the overall look)