cc-cmux-plugin

A Claude Code plugin that integrates cmux — a native macOS terminal for AI coding agents built on the Ghostty engine — with Claude Code sessions.

What it does

When installed, this plugin automatically:

• Injects cmux context into every Claude Code session — the full cmux command reference for status bar, pane management, browser control, and multi-agent orchestration
• Sets agent status in the cmux sidebar (Active on session start, Idle on stop)
• Routes notifications through cmux's native notification system
• Grants permissions for all cmux CLI commands

Hooks

Event	Behavior
SessionStart	Injects rules/cmux-integration.md into context; sets status to "Active"
Stop	Sets status to "Idle"; clears progress bar
Notification	Forwards Claude Code notifications to cmux notify

Installation

Marketplace (recommended)

First, register the marketplace:

/plugin marketplace add KyleJamesWalker/cc-cmux-plugin

Then install the plugin:

claude plugin install cmux-integration@KyleJamesWalker-cc-cmux-plugin

You can also register and enable it manually in ~/.claude/settings.json:

{
  "extraKnownMarketplaces": {
    "KyleJamesWalker-cc-cmux-plugin": {
      "source": {
        "source": "github",
        "repo": "KyleJamesWalker/cc-cmux-plugin"
      }
    }
  },
  "enabledPlugins": {
    "cmux-integration@KyleJamesWalker-cc-cmux-plugin": true
  }
}

Local development

Load the plugin directly from a local checkout (for the current session only):

git clone https://github.com/KyleJamesWalker/cc-cmux-plugin.git
claude --plugin-dir ./cc-cmux-plugin

Updating

Plugins are cached locally and keyed by the version field in plugin.json. To pick up new changes:

claude plugin update cmux-integration@KyleJamesWalker-cc-cmux-plugin

Project structure

.claude-plugin/
  marketplace.json   # Marketplace registry metadata
  plugin.json        # Plugin manifest (name, version, permissions, hooks ref)
hooks/
  hooks.json         # Hook definitions (SessionStart, Stop, Notification)
rules/
  cmux-integration.md  # Context injected into every session

Requirements

• cmux must be installed and the session must be running inside a cmux workspace ($CMUX_WORKSPACE_ID set)
• Claude Code with plugin support