I had some ideas for extending the lem editor (emacs in common lisp) the other day and I am barely literate in Lisp. So I had Claude Code do it.

Fully awesome. No problems. A few paren issues, buit it seemed to not really struggle really. It produced working code. Was also really good at analyzing the lem codebase as well.

I even had it write an agentic coding tool in Common Lisp using the RLM ideas: https://alexzhang13.github.io/blog/2025/rlm/

Lisp is a natural fit for this kind of thing. And it worked well.

(I also suspect if parens were really a problem... there's room here for MCP or other tooling to help. Basically paredit but for agents)