amux
What it is
amux is a terminal multiplexer designed for shared work between people using keybindings and agents using CLI commands in the same panes. Users can create and arrange panes, manage windows, zoom panes, and send keystrokes to multiple panes at once. Its CLI supports structured JSON session capture, blocking waits, and push-based events without a required SDK or language-specific library. Pane history stays on the server and can remain available across detach and reattach, server reload, and crash recovery; the default scrollback is 5,000 lines per pane. A built-in mailbox lets panes exchange, reply to, and acknowledge messages, with recipients checking an inbox rather than receiving messages as terminal input. An optional local MCP server over stdio exposes tools for that mailbox. amux can mirror remote panes and windows over SSH, forwarding input and streaming remote PTY output. The project is free and MIT licensed, with shell script, Homebrew, and go install options.
For and against
For
- Retains pane history across reloads and recovery
- Mailbox supports pane-to-pane messages
- Can mirror remote panes over SSH
- Free and MIT licensed
Against
- Does not implement all tmux features
- First server start requires ncurses tic
- Default scrollback is 5,000 lines per pane
The verdict
amux combines terminal pane management with CLI-oriented agent workflows, a mailbox, and remote pane mirroring. Users who depend on features such as session groups or advanced hooks may need tmux instead.
Who it suits
amux may suit people coordinating terminal work with agents, especially those using Claude Code or Codex. It is available for Linux and macOS.
Plans and prices
Open source
MIT licensed · installable from source, Homebrew tap, or GitHub Releases
Read 5 Oct 2026 · github.com
On the record
- Agent API
- Its CLI provides structured JSON session capture, blocking waits, and push based events without requiring an SDK or language specific library.github.com · read 5 Oct 2026
- Agent integrations
- The repository documents agent support and automation for Claude Code and Codex, including mailbox drain hook recipes.github.com · read 5 Oct 2026
- History
- Pane history is retained on the server and can persist across detach and reattach, server reload, and crash recovery; the default scrollback is 5,000 lines per pane.github.com · read 5 Oct 2026
- Installation
- The README lists installation through a shell script, Homebrew, or `go install`; first server start installs a terminfo entry and requires ncurses `tic`.github.com · read 5 Oct 2026
- License
- The repository identifies amux as MIT licensed.github.com · read 5 Oct 2026
- Limitations
- The project says it does not implement all tmux features, naming session groups and advanced hooks as examples of functionality to use tmux for.github.com · read 5 Oct 2026
- Mailbox
- The built in mailbox lets panes send, read, reply to, and acknowledge messages, while recipients check for messages through the inbox rather than automatic PTY input.github.com · read 5 Oct 2026
- MCP
- An optional local MCP server over stdio exposes tools for the native amux mailbox.github.com · read 5 Oct 2026
- Pane controls
- Users can create and arrange panes, manage windows, zoom panes, and broadcast keystrokes to multiple panes.github.com · read 5 Oct 2026
- Purpose
- amux is a terminal multiplexer built for shared workflows where humans use keybindings and agents use CLI commands in the same panes.github.com · read 5 Oct 2026
- Remote workflows
- amux can mirror remote panes and windows over SSH, forwarding input and streaming remote PTY output.github.com · read 5 Oct 2026
