macOS Notify MCP

A Model Context Protocol (MCP) server for macOS notifications with tmux integration. This tool allows AI assistants like Claude to send native macOS notifications that can focus specific tmux sessions when clicked.

Features

• 🔔 Native macOS notifications using UserNotifications API
• 🖱️ Clickable notifications that focus tmux sessions
• 🎯 Direct navigation to specific tmux session, window, and pane
• 🔊 Customizable notification sounds
• 🚀 Support for multiple concurrent notifications
• 🤖 MCP server for AI assistant integration

Installation

Prerequisites

• macOS (required for notifications)
• Node.js >= 18.0.0
• tmux (optional, for tmux integration)

Install from npm

npm install -g macos-notify-mcp

Build from source

git clone https://github.com/yuki-yano/macos-notify-mcp.git
cd macos-notify-mcp
npm install
npm run build
npm run build-app  # Build the macOS app bundle (only needed for development)

Usage

As MCP Server

First, install the package globally:

npm install -g macos-notify-mcp

Quick Setup with Claude Code

Use the claude mcp add command:

claude mcp add macos-notify -s user -- macos-notify-mcp

Then restart Claude Code.

Manual Setup for Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "macos-notify": {
      "command": "macos-notify-mcp"
    }
  }
}

Available MCP Tools

• send_notification - Send a macOS notification

  • message (required): Notification message
  • title: Notification title (default: "Claude Code")
  • sound: Notification sound (default: "Glass")
  • session: tmux session name
  • window: tmux window number
  • pane: tmux pane number
  • useCurrent: Use current tmux location

• list_tmux_sessions - List available tmux sessions

• get_current_tmux_info - Get current tmux session information

As CLI Tool

# Basic notification
macos-notify-cli -m "Build completed"

# With title
macos-notify-cli -t "Development" -m "Tests passed"

# With tmux integration
macos-notify-cli -m "Task finished" -s my-session -w 1 -p 0

# Use current tmux location
macos-notify-cli -m "Check this pane" --current-tmux

# List tmux sessions
macos-notify-cli --list-sessions

How it Works

1. Notification Delivery: Uses a native macOS app bundle (MacOSNotifyMCP.app) to send UserNotifications API notifications
2. Click Handling: When a notification is clicked, the app activates the terminal and switches to the specified tmux session
3. Terminal Support: Works with Alacritty, iTerm2, WezTerm, and Terminal.app
4. Multiple Instances: Each notification runs as a separate process, allowing multiple concurrent notifications

Architecture

The project consists of two main components:

1. MCP Server/CLI (TypeScript/Node.js)

   • Implements the Model Context Protocol
   • Provides a command-line interface
   • Manages tmux session detection and validation

2. MacOSNotifyMCP.app (Swift/macOS)

   • Native macOS application for notifications
   • Handles notification clicks to focus tmux sessions
   • Runs as a background process for each notification

MacOSNotifyMCP.app

The MacOSNotifyMCP.app is bundled with the npm package and is automatically available after installation. No additional setup is required.

Troubleshooting

Notifications not appearing

1. Check System Settings → Notifications → MacOSNotifyMCP
2. Ensure notifications are allowed
3. Run macos-notify-mcp -m "test" to verify

tmux integration not working

1. Ensure tmux is installed and running
2. Check session names with macos-notify-mcp --list-sessions
3. Verify terminal app is supported (Alacritty, iTerm2, WezTerm, or Terminal)

Development

# Install dependencies
npm install

# Build TypeScript
npm run build

# Run in development
npm run dev

# Lint and format code
npm run lint
npm run format

# Build macOS app (only if modifying Swift code)
npm run build-app

License

MIT

Author

Yuki Yano