Lambda Symbolics' Autolith is a Common Lisp programming agent that runs inside a live SBCL image it can inspect and redefine at runtime — a design that takes the Lisp machine idea of a persistent, self-modifiable environment and applies it to AI coding agents.
A post from July 7 builds an AI agent in ~100 lines of Common Lisp with exactly one tool: eval. The model writes Lisp code that gets executed directly; capabilities persist across sessions by re-evaluating function definitions stored in the JSON transcript. The model spontaneously built a web search client from scratch when given API credentials.