jmux

Details

External ID

47650233

Source

HN

Company

—

Product

jmux

Website domain

github.com

Launched

April 5, 2026

Cohort

—

Upvotes

10

Upvotes percentile

0.5919023136246787

Tags

—

Fetched at

Sept. 7, 2026, 9:26 p.m.

Updated at

Sept. 7, 2026, 9:26 p.m.

Description

I've been a tmux user for years. When I started running 5-10 Claude Code sessions in parallel, I tried the tools that are out there: Conductor, cmux, the GUI orchestrators. None of them felt right. They either wanted me to leave tmux entirely for a 100MB+ Electron app with its own editor and Git workflow, or they were thin wrappers that didn't solve the actual problem: I need to parallelize my entire development environment, agents, editors, servers, logs, and keep track of all of it.So I built jmux. It turns tmux into a parallel development environment. Every session, every agent, every running process, visible and navigable from one terminal. When Claude Code completes a response, an orange flag appears on that session. Switch to it, review the work, move on. No context switching to a different app. No learning a new workflow. It's still tmux underneath.The key decision was to build on tmux instead of replacing it. My ~/.tmux.conf still works. My neovim setup still works. My keybindings, plugins, prefix key, etc, all of it carries over. jmux just makes it all work at scale.What it does:- Run Claude Code, Codex, aider. Any agent, directly, in parallel- Attention flags. Know the moment an agent finishes without watching every pane- Instant switching between sessions (Ctrl-Shift-Up/Down, no prefix key)- Auto-groups sessions by project and git branch- Works with your existing tmux config, editor, and tools- No SDK, no API wrappers. First-party tools, no middleman.What it doesn't do:- No built-in editor (I use neovim btw)- No built-in Git (use yours)- No agent protocol/wrapper (run them directly in the terminal)~1800 lines of TypeScript, ~0.3 MB installed. MIT licensed.Landing page: https://jmux.buildGithub: https://github.com/jarredkenny/jmux

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