OpenCode Tmux Plugin

An OpenCode plugin that automatically updates your tmux window name based on the current OpenCode session.

Features

• Automatically renames tmux window when a new OpenCode session starts
• Updates window name when you switch between sessions
• Updates window name when session title changes
• Restores the original window name when OpenCode closes (or falls back to the prefix)
• Tracks all main sessions (ignores subagent sessions)
• Safe: only runs if you're inside a tmux session

Installation

Add the plugin to your OpenCode config at ~/.config/opencode/opencode.json:

{
  "plugin": [
    "@kevincojean/opencode-tmuxwindowrenaming"
  ]
}

Restart OpenCode or start a new session to activate the plugin.

How It Works

The plugin listens to OpenCode session events and chat messages:

• session.created: When a main session (non-subagent) is created, it stores the session
• session.updated: When the session title changes, it updates the window name
• chat.message: When you send a message in a different session, it detects the switch and updates the window name
• session.deleted: When a session ends, it removes it from tracking
• server.instance.disposed: When OpenCode shuts down, it restores the original window name (captured at startup) or falls back to the prefix (default [OC] )

Note: The window name updates when you send a message in a session, not immediately when you switch using /sessions. This means the window reflects the session you're actively working in.

Development

• Watch mode: npm run watch - automatically rebuilds on file changes
• Manual build: npm run build

Configuration

The plugin accepts the following configuration options:

Option	Type	Default	Description
maxLength	number	60	Max length for the tmux window name
waitingIndicator	string	"● "	Prefix when waiting for input, set to "" to disable
namePrefix	string	"[OC] "	Window name prefix
logFile	string	(none)	Path to log file. If omitted, logging is disabled.

Example configuration in opencode.json:

{
  "plugin": [
    [
      "@kevincojean/opencode-tmuxwindowrenaming",
      {
        "maxLength": 60,
        "waitingIndicator": "⏳ ",
        "namePrefix": "[OC] ",
        "logFile": "/tmp/tmux-plugin.log"
      }
    ]
  ]
}

All options are optional. Omitting an option uses its default value.

Requirements

• tmux must be installed
• OpenCode must be running inside a tmux session
• The TMUX environment variable must be set (automatic when inside tmux)

Troubleshooting

• Check that you're running OpenCode inside a tmux session: echo $TMUX
• Look for plugin logs in OpenCode's output (they start with [tmux-plugin])
• Verify the plugin is registered in ~/.config/opencode/opencode.json
• Make sure the plugin is built: check that dist/index.js exists
• If your tmux theme (e.g., Nord) shows a white/reversed window status bar, see TROUBLESHOOTING.md for a fix