Telegram Notification MCP Server

An MCP (Model Context Protocol) server that sends notifications to Telegram when Claude Code completes tasks. Built with TypeScript using the Cloudflare Agents SDK and deployable on Cloudflare Workers.

Features

🤖 MCP Tool: Provides a send_telegram_message tool for sending notifications
🚀 Cloudflare Workers: Runs serverless with global distribution
🔐 Secure: Uses Cloudflare secrets for credentials
🌐 Dual Transport: Supports both SSE and Streamable HTTP for maximum compatibility
💾 Durable Objects: State management required by McpAgent
💬 Message Formatting: Supports Markdown and HTML formatting
📝 Formatting: Supports Markdown and HTML message formatting

Architecture

This server implements the MCP specification using Cloudflare's Agents SDK:

GET /sse: SSE endpoint for MCP communication
POST /mcp: Streamable HTTP endpoint for MCP communication
Built with TypeScript, MCP SDK, and Cloudflare Agents SDK
Proper JSON-RPC 2.0 error handling
Durable Objects for stateful connections (required by McpAgent)
Node.js compatibility mode enabled

Setup

Prerequisites

Telegram Bot: Create a bot via @BotFather and get your bot token
Chat ID: Get your chat ID by sending a message to your bot and visiting:
```
https://api.telegram.org/bot<YOUR_BOT_TOKEN>/getUpdates
```
Cloudflare Account: Sign up at cloudflare.com

Installation

Clone this repository
Install dependencies:
```
pnpm install
```

Configuration

Create a .dev.vars file from the example:
```
cp .dev.vars.example .dev.vars
```
Then edit .dev.vars with your bot token and chat ID. This file is used for both local development and deployment.
For production deployment, set up Cloudflare secrets:
```
npx wrangler secret put BOT_TOKEN
npx wrangler secret put DEFAULT_CHAT_ID  # Optional
```
Note: The DEFAULT_CHAT_ID is optional. If not set, you must provide a chat_id parameter when calling the send_telegram_message tool.
Update wrangler.toml with your worker name if desired

Deployment

Deploy to Cloudflare Workers:

Deploy using Wrangler:

# First set secrets
npx wrangler secret put BOT_TOKEN
npx wrangler secret put DEFAULT_CHAT_ID  # Optional

# Then deploy
pnpm run deploy

Alternative: Continuous Deployment

You can also set up continuous deployment directly from the cloudflare dashboard. Learn more about git integration with cloudflare

Claude Code Configuration

Add the MCP server to Claude Code using the CLI via SSE transport:

# For production deployment (SSE)
claude mcp add telegram-notify https://your-worker-name.workers.dev/sse -t sse

# For local development
claude mcp add telegram-notify http://localhost:8787/sse -t sse

Note: This server supports both SSE (Server-Sent Events) and Streamable HTTP transport. While SSE works well, Streamable HTTP provides better reliability and is the newer standard.

You can verify the configuration with:

claude mcp list

Usage

Once configured, Claude Code can send notifications to your Telegram whenever you need them.

Available Tool

send_telegram_message: Send a notification message to Telegram

text (required): The message text to send
chat_id (optional): Telegram chat ID (uses DEFAULT_CHAT_ID if not provided)
parse_mode (optional): "Markdown" or "HTML" for message formatting
disable_notification (optional): Send message silently

Example usage:

// Uses DEFAULT_CHAT_ID from environment
await send_telegram_message({ text: "Task completed!" })

// Send to specific chat (overrides DEFAULT_CHAT_ID)
await send_telegram_message({ text: "Hello!", chat_id: "123456789" })

// Send with Markdown formatting
await send_telegram_message({ 
  text: "*Bold* and _italic_ text", 
  parse_mode: "Markdown" 
})

When You'll Get Notifications

Claude Code sends notifications when:

You explicitly ask: "notify me when done" or "let me know on Telegram"
Errors occur during execution
Important milestones are reached
User input or intervention is needed

Example Scenarios

# You say: "Deploy to production and notify me when done"
# Result: 🤖 Claude Code Notification
#         Deployment completed successfully! The app is now live.

# You say: "Run all tests and let me know the results"
# Result: 🤖 Claude Code Notification
#         All tests passed! 52/52 tests successful.

# You say: "Process this data and notify me if there are any errors"
# Result: 🤖 Claude Code Notification
#         Error: Failed to process row 451 - invalid date format

Example Notifications

Example of Telegram notifications from Claude Code

Claude Code sending notifications during task completion

CLAUDE.md Examples

To encourage Claude Code to use Telegram notifications effectively, add these to your CLAUDE.md:

# Telegram Notifications

Use the mcp__telegram-notify__send_telegram_message tool to send notifications to Telegram.

- Always send a Telegram notification when:
  - A task is fully complete
  - You need user input to continue
  - An error occurs that requires user attention
  - The user explicitly asks for a notification (e.g., "notify me", "send me a message", "let me know")

- Include relevant details in notifications:
  - For builds/tests: success/failure status and counts
  - For errors: the specific error message and file location

- Use concise, informative messages like:
  - "✅ Build completed successfully (2m 34s)"
  - "❌ Tests failed: 3/52 failing in auth.test.ts"
  - "⚠️ Need permission to modify /etc/hosts"

Development

Run locally:

# Start local development server
pnpm dev

For local development, Wrangler will automatically load environment variables from your .dev.vars file.

Run all checks before deployment:

pnpm build

This command runs:

pnpm format - Format code with Biome
pnpm lint:fix - Fix linting issues
pnpm cf-typegen - Generate Cloudflare types
pnpm type-check - Check TypeScript types

Test the server:

# Test SSE connection
curl http://localhost:8787/sse

# Test health endpoint
curl http://localhost:8787/

Debugging

Testing the SSE Connection

You can test the SSE endpoint directly:

curl -N http://localhost:8787/sse

This should return an event stream starting with an endpoint event.

Common Issues

Connection closes immediately: Check that your worker is running and accessible at the specified URL.
No endpoint event received: Ensure the SSE headers are being sent correctly and the stream is properly formatted.
Telegram notifications not sent: Verify your BOT_TOKEN and DEFAULT_CHAT_ID are correctly set in the worker environment.

Technical Details

Language: TypeScript (ES2021 target)
Runtime: Cloudflare Workers with Node.js compatibility
Protocol: MCP (Model Context Protocol)
Transport: SSE and Streamable HTTP
State Management: Durable Objects (required by McpAgent)
Observability: Enabled for monitoring

References

This project was built following these guides:

Build a Remote MCP server - Cloudflare Agents
Model Context Protocol (MCP) - Cloudflare Agents
MCP Transport Methods - Cloudflare Agents
Cloudflare MCP Template (remote-mcp-authless)

Related Projects

Discord Notification MCP - Send notifications to Discord instead of Telegram

License

MIT

Telegram通知