crmux 0.3.0

A TUI viewer for Claude Code sessions in tmux
crmux-0.3.0 is not a library.

crmux

A TUI viewer for Claude Code sessions in tmux.

Inspired by cmux. crmux brings a similar multi-session management experience using tmux and a terminal UI.

  • Monitor multiple Claude Code sessions from a single sidebar and preview their output
  • Mark sessions to preview multiple panes simultaneously
  • Switch to any session's tmux pane instantly
  • Send prompts directly via tmux send-keys in input mode without leaving crmux
  • Pulse animation to highlight sessions that need attention (approval idle, stale idle)

Demo

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Prerequisites

Installation

From crates.io (Recommended)

cargo install crmux

After installation, make sure ~/.cargo/bin is in your PATH, then you can run:

crmux

Build from source

git clone https://github.com/maedana/crmux.git
cd crmux
cargo build --release

Usage

Run inside a tmux session:

crmux

Keybindings

Keybindings are shown in the app footer. Run crmux -h or press ? in the app to see all available keybindings.

Roadmap

  • Display git branch and worktree info per session
  • Auto-set session title based on the most recent plan mode content
  • More layout options for multi-preview (currently horizontal equal split only)
  • Session status summary in footer (e.g. Running 3 / Idle 2 / Approval 1)
  • Programmatic control from external tools (e.g. tmux-style subcommands, MCP server)

Limitations

Input mode uses tmux send-keys to forward keystrokes, which has inherent limitations:

  • Modifier keys: Some modifier key combinations (e.g. Shift+Enter, Ctrl+Enter) cannot be accurately reproduced via tmux send-keys
  • Terminal dependency: Terminals without Kitty keyboard protocol support (VTE-based terminals such as XFCE Terminal, GNOME Terminal) cannot distinguish some modified key events from their unmodified counterparts

License

MIT