truffle

https://github.com/truffle-dev/truffle-rb

Truffle is a dependency-free agent harness for Ruby, built from scratch as a faithful port of earendil-works/pi: a provider-agnostic LLM seam, an agent loop with tool calling and state, an event-streaming protocol for UIs, and a foundation for skills, commands, sessions, and memory. No runtime gem dependencies; the LLM client, tool layer, and event model are written from the ground up.