Cmux Msg

Name: Cmux Msg
Author: kawaz

kawaz/claude-cmux-msg·1 plugin

Coordinate multiple Claude Code sessions in cmux panes with file-based messages instead of copy-pasting context.

Overview

cmux-msg is a plugin marketplace for the Build phase that registers file-based messaging between Claude Code sessions in cmux panes.

What is this marketplace?

1 plugin: cmux-msg for inter–Claude Code messaging via files
Designed for cmux terminal panes running parallel CC sessions
MIT-licensed marketplace bundle at version 0.28.13 metadata
Decouples sessions so agents can hand off notes without shared chat history
Local file-based transport—no separate message broker required
1 plugin in marketplace (cmux-msg)
Marketplace metadata version 0.28.13
MIT license in marketplace metadata

Compatible agents: Claude Code, any compatible agent

What problem does it solve?

Running multiple Claude Code panes in cmux leaves each session isolated, so you manually shuttle context and decisions between agents.

Who is it for?

Solo builders who live in cmux, run two or more Claude Code panes, and want simple on-disk messaging between those sessions.

Skip if: Teams that do not use cmux or Claude Code in the terminal, or anyone needing cloud queueing, RBAC, or non-file transports.

What do I get? / Deliverables

After installing cmux-msg, parallel CC sessions in cmux can exchange messages through shared files so handoffs stay visible and repeatable.

Registered cmux-msg plugin in Claude Code
File-based message channel usable across cmux CC panes

Plugins in this marketplace

1 plugin — install individually after you add the marketplace.

PluginVersion

Cmux MsgFile-based messaging between Claude Code sessions running in cmux panes—

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Journey fit

Primary fit

BuildAgent skills & templates

Multi-session agent work happens while you are actively building and iterating in the terminal. cmux-msg is agent-tooling that wires Claude Code panes together, not a product feature or deployment step.

How it compares

Terminal multiplexer plugin marketplace, not a standalone MCP server or generic skills.sh skill pack.

Common Questions / FAQ

Who is Cmux Msg for?

It is for developers who orchestrate several Claude Code instances inside cmux and need a built-in way to pass messages between panes.

When should I use Cmux Msg?

Use it during active build work when you split tasks across parallel CC sessions and want file-backed coordination instead of ad-hoc paste.

How do I add Cmux Msg to my agent?

Add the kawaz Cmux Msg marketplace to Claude Code, install the Cmux Msg plugin entry, and configure your cmux panes to use the documented message file paths.