# Muxxy: Like Slime, for AI + Tmux > Source: > Published: 2026-08-14 00:00:00+00:00 Discovering Jpalardy's [Like Slime, for Vim](https://technotales.wordpress.com/2007/10/03/like-slime-for-vim/) was a revelation to me. I could have *any* repl in my editor? *Whether it knew it was there or not?* It also served as [the basis for my daily driver for writing Common Lisp](https://blog.djhaskin.com/blog/developing-common-lisp-using-vim-with-tmux-or-conemu/) more recently. As I wrote in that post, not only were for-purpose REPL tools complicated, they simply didn't measure up to the functionality I could get out of `vim-slime` . I missed this switch-out-a-repl functionality when I started moving into the AI era with my hobby coding. I wrote about [how frustrating it was to write Common Lisp](https://blog.djhaskin.com/blog/writing-lisp-is-ai-resistant-and-im-sad/). Looking back, it was mostly because I couldn't effectively have the AI interact with the REPL. Folks on reddit from when I posted that turned me on to [cl-mcp](https://github.com/cl-ai-project/cl-mcp), and I have since learned there were others like it. That worked well enough, but after reading [Mario's post](https://mariozechner.at/posts/2025-11-02-what-if-you-dont-need-mcp/) about skills-over-mcp AND trying [freebuff](https://freebuff.com/) for the first time (it doesn't support MCP), I finally figured I needed a CLI solution. First, I wrote [swanky](https://github.com/djha-skin/swanky), and that worked a treat, but it required a lisp Swank server running. This had a couple problems. First, if my lisp code printed to standard out, it wouldn't get captured, or it didn't seem so. Second, I had to keep spinning up swank servers and staying on top of making sure the AI had one available. That got old. I had previously tried building an MCP server for interacting with REPLs over MCP called [tmux-repl-mcp](https://github.com/djha-skin/tmux-repl-mcp). It worked, but I hadn't quite gotten the chops in my AI journey yet around getting the AI to use it right. I didn't realize when I wrote it that you needed to write a skill or the AI wouldn't use the tool right. The time was right to make that a CLI tool, so I had the AI rewrite it in Rust this morning. The new tool is called [muxxy](https://github.com/djha-skin/muxxy), and it works *really well*! It comes with a skill in its `.agents` folder that tells the AI how to use it. It is capable of spinning up SBCL, Python, iPython, and Ruby shells out of the box, but there's also a custom `--prompt` flag the AI can use to tell the AI what output to look for when scraping from tmux. I look forward to using this tool for many of my projects, including REPL-intensive ones like Common Lisp, but it would work equally well for anything else -- Clojure, Janet, Julia, Python, Elixir, a custom CL implementation. That old "possibilities are endless" feeling of excitement I felt when I discovered `vim-slime` is back!