push-notification-mcp

A local MCP server that sends push notifications on macOS.

Quick Start

pnpm install && pnpm run build && npx @anthropic-ai/mcpb pack .

Drag the .mcpb into Claude Desktop or any MCPB-compatible client of your choice.

Specification

NOTE: This project was generated from an NLSpec (included) and was wholly implemented (or "dark-complied") by a Claude model (code formatting not included) as an experiment/initial evaluation of the NLSpec approach (see below). Also

An NLSpec (as la the @TG-Techie flavor) is a prescriptive, generative specification written in natural language — precise enough to derive a faithful implementation from, flexible enough to leave genuine implementation choices to the builder. For background on the approach, see the strongdm/attractor repo where the concept was developed in practice.

How It Works

The server exposes a single MCP tool — send_notification — over stdio. When called, it delivers a native macOS notification displaying a title and body. The notification mechanism is osascript with display notification, invoked via execFile (no shell). User input is passed as argv to the AppleScript on run argv handler — never interpolated into script text.

Installation

As an MCPB Bundle

Build and pack:

pnpm install && pnpm run build && npx @anthropic-ai/mcpb pack .

This produces a .mcpb file you can install in Claude Desktop or any MCPB-compatible client.

As a Standalone MCP Server

Add to your MCP client configuration:

{
  "mcpServers": {
    "push-notification": {
      "command": "node",
      "args": ["/absolute/path/to/push-notification-mcp/dist/index.js"]
    }
  }
}

Or if published to npm:

{
  "mcpServers": {
    "push-notification": {
      "command": "npx",
      "args": ["-y", "push-notification-mcp"]
    }
  }
}

Run Directly

npm install
npm run build
node dist/index.js

The server communicates over stdio (stdin/stdout). Diagnostic logs go to stderr.

Environment Variables

All configuration is optional. The server works out of the box with sensible defaults.

Variable	Type	Default	Description
PUSH_NOTIFICATION_RATE_LIMIT_ENABLED	boolean	true	Set to false or 0 to disable rate limiting
PUSH_NOTIFICATION_RATE_LIMIT_BURST	integer	5	Token bucket capacity (max burst)
PUSH_NOTIFICATION_RATE_LIMIT_REFILL_MS	integer	12000	Milliseconds between token refills

Boolean values accept true/1 (truthy) and false/0 (falsy), case-insensitive. Integer values must be positive; invalid values are ignored and defaults are used, with a warning logged to stderr.

With defaults: burst of 5 notifications, then sustained rate of ~5 per minute (one every 12 s). The bucket refills continuously — idle for 60 s and it's full again.

Platform

macOS only. The notification delivery mechanism (osascript display notification) is available on all default macOS installations. macOS may prompt you to allow notifications from "Script Editor" — this is expected.

License

MIT