notify_me_mcp

TypeScript MCP server for sending notifications to Discord and/or Slack webhooks

A powerful Model Context Protocol (MCP) server that provides webhook notification capabilities to AI agents and LLM applications. Send rich notifications to Discord and Slack with automatic service detection, retry logic, and comprehensive security features.

✨ Features

🔧 Three MCP Tools: send_notification, validate_webhook, list_services
🎯 Multi-Service Support: Discord, Slack, or both simultaneously
🛡️ Security First: Webhook URLs never exposed in logs or process lists
📱 Rich Content: Discord embeds and Slack blocks/attachments support
🔄 Robust Retry Logic: Handles rate limiting with exponential backoff
⚡ Service Auto-Detection: Automatically selects available services
🔍 Input Validation: Comprehensive schema validation with Zod
📊 Structured Logging: Secure logging with automatic URL redaction

🚀 Quick Start

Prerequisites

Node.js ≥ 23.7.0
npm ≥ 10.9.2
Discord and/or Slack webhook URLs

Installation

Clone the repository
git clone https://github.com/thesammykins/notifyme_mcp.git cd notifyme_mcp
Install dependencies
npm install
Configure webhooks
cp .env.example .env # Edit .env and replace webhook placeholders
Build the project
npm run build

Configuration

Create a .env file with your webhook URLs:

# Discord webhook URL (optional)
DISCORD_WEBHOOK_URL="https://discord.com/api/webhooks/YOUR_ID/YOUR_TOKEN"

# Slack webhook URL (optional)  
SLACK_WEBHOOK_URL="https://hooks.slack.com/services/T00/B00/XXXX"

# Optional: Custom .env file location
# NOTIFY_ME_ENV_FILE="/path/to/custom/.env"
# NOTIFY_ME_ENV_DIR="/path/to/directory"

Getting Webhook URLs:

Discord:

Go to Server Settings → Integrations → Webhooks
Click "Create Webhook" → Copy webhook URL

Slack:

Create a Slack app at https://api.slack.com/apps
Enable "Incoming Webhooks" → Add to workspace
Copy the webhook URL

🔧 Usage with MCP Clients

Claude Desktop Configuration

Add to your Claude Desktop claude_desktop_config.json:

{
  "mcpServers": {
    "notify_me_mcp": {
      "command": "node",
      "args": ["path/to/notifyme_mcp/dist/index.js"],
      "env": {
        "DISCORD_WEBHOOK_URL": "your_discord_webhook_url",
        "SLACK_WEBHOOK_URL": "your_slack_webhook_url"
      }
    }
  }
}

Other MCP Clients

Use the built server at dist/index.js with any MCP-compatible client over stdio transport.

🛠️ Available Tools

`send_notification`

Send notifications to Discord and/or Slack webhooks.

Parameters:

message (string, optional): Plain text message
service (string, optional): "discord", "slack", or "both" (auto-detected if not specified)
embed_json (object/array/string, optional): Rich content (Discord embeds, Slack blocks)
username (string, optional): Override display username
avatar_url (string, optional): Override avatar/icon URL
tts (boolean, optional): Enable text-to-speech (Discord only)

Examples:

// Simple notification
{"message": "Task completed successfully ✅"}

// Target specific service
{"message": "Deploy finished", "service": "slack", "username": "CI Bot"}

// Discord embed
{
  "service": "discord",
  "embed_json": {
    "title": "Build Status", 
    "description": "All tests passed",
    "color": 65280
  }
}

// Slack blocks
{
  "service": "slack",
  "embed_json": [
    {
      "type": "section",
      "text": {
        "type": "mrkdwn", 
        "text": "*Deploy Complete* 🚀\nAll systems operational"
      }
    }
  ]
}

`validate_webhook`

Test webhook connectivity by sending a test message.

Parameters:

service (string, optional): "discord", "slack", or "both"
message (string, optional): Custom test message

`list_services`

List configured webhook services and auto-detected default.

No parameters required.

🏗️ Service Auto-Detection

The server automatically detects which services to use:

Only Discord configured → discord
Only Slack configured → slack
Both configured → discord (default for backward compatibility)
Use service: "both" → Send to all configured services

🔒 Security Features

Webhook Protection: URLs never appear in logs, errors, or process lists
Secure Logging: Automatic redaction of sensitive information
Input Validation: All inputs validated with Zod schemas
Rate Limiting: Automatic retry on 429 responses with Retry-After support
Temporary Files: Created with restrictive permissions (077)

🎨 Rich Content Support

Discord Embeds

Supports Discord's native embed objects:

{
  "title": "Deployment Status",
  "description": "Production deployment completed",
  "color": 65280,
  "fields": [
    {"name": "Version", "value": "v1.2.3", "inline": true},
    {"name": "Duration", "value": "3m 42s", "inline": true}
  ],
  "timestamp": "2024-01-15T10:30:00.000Z"
}

Slack Blocks & Attachments

Supports Slack's block kit and legacy attachments:

// Blocks (recommended)
[
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "*Deployment Complete* 🚀\nVersion v1.2.3 deployed successfully"
    }
  }
]

// Attachments (legacy)
{
  "attachments": [
    {
      "color": "good",
      "title": "✅ Success",
      "text": "All tests passed",
      "fields": [
        {"title": "Environment", "value": "Production", "short": true}
      ]
    }
  ]
}

📊 Common Colors

Status	Discord (decimal)	Slack (hex/keyword)
Success	`65280`	`#36a64f` or `good`
Error	`16711680`	`#ff0000` or `danger`
Warning	`16753920`	`#ffa500` or `warning`
Info	`3447003`	`#3498db`

🧪 Development

Run in Development Mode

npm run dev  # Uses tsx with watch mode

Build

npm run build  # Compiles TypeScript to dist/

Start Production Server

npm start  # Runs compiled JavaScript

Testing

npm test        # Run tests once
npm run test:watch  # Run tests in watch mode

📁 Project Structure

notify_me_mcp/
├── src/
│   ├── index.ts        # MCP server entry point
│   ├── config.ts       # Environment loading & service detection
│   ├── payload.ts      # Discord/Slack payload builders
│   ├── senders.ts      # HTTP senders with retry logic
│   ├── logger.ts       # Secure logging with redaction
│   ├── types.ts        # TypeScript interfaces & Zod schemas
│   └── utils.ts        # Helper functions
├── dist/               # Compiled JavaScript
├── .env.example        # Environment template
├── package.json        # Node.js configuration
├── tsconfig.json       # TypeScript configuration
└── README.md          # This file

🔧 Environment Variables

Variable	Description	Example
`DISCORD_WEBHOOK_URL`	Discord webhook URL	`https://discord.com/api/webhooks/...`
`SLACK_WEBHOOK_URL`	Slack webhook URL	`https://hooks.slack.com/services/...`
`NOTIFY_ME_ENV_FILE`	Custom .env file path	`/path/to/.env`
`NOTIFY_ME_ENV_DIR`	Custom .env directory	`/path/to/config`

🐛 Troubleshooting

Common Issues

"No webhook URLs configured"

Ensure .env file exists with valid webhook URLs
Check environment variable names match exactly

"Discord message exceeds 2000 character limit"

Discord has a 2000 character limit for message content
Use embeds for longer content or split messages

"Invalid JSON in embed_json"

Validate JSON syntax before sending
Use proper escaping for quotes in JSON strings

Connection timeouts

Check network connectivity to Discord/Slack APIs
Verify webhook URLs are correct and active

Debug Mode

For troubleshooting, you can run with verbose logging:

DEBUG=* npm start

🤝 Contributing

Fork the repository
Create a feature branch: git checkout -b feature/my-feature
Make your changes
Build and test: npm run build && npm test
Commit your changes: git commit -am 'Add some feature'
Push to the branch: git push origin feature/my-feature
Submit a pull request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

notify_me.sh - The original bash script that inspired this MCP server
Model Context Protocol - Official MCP documentation
Discord Webhooks - Discord webhook documentation
Slack Webhooks - Slack incoming webhook documentation

🙋‍♂️ Support

Issues: Report bugs and request features on GitHub Issues
Documentation: Check this README and inline code comments
MCP Protocol: Refer to MCP documentation for client setup

Built with ❤️ using TypeScript and the Model Context Protocol

Deploy Server

HTTP connection URL

security – no known vulnerabilities

license - permissive license

quality - confirmed to work

How are these scores calculated?

hybrid server

The server is able to function both locally and remotely, depending on the configuration or use case.

Tools

Enables sending rich notifications to Discord and/or Slack webhooks with automatic service detection, retry logic, and support for embeds, blocks, and attachments. Provides secure webhook management with comprehensive input validation and rate limiting.

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