💬 Generate text & image responses in Telegram channels with GPT-4 and TGPT

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Description

Telegram AI Channel Bot - Text & Image Response Generator with TGPT

Overview

This n8n workflow creates an automated Telegram channel bot that responds to messages with AI-generated text or images using TGPT. The bot monitors a specific Telegram channel and generates responses based on message prefixes.

Features

• Automated text response generation using TGPT
• Image generation capabilities with customizable dimensions (1920x1080)
• Duplicate message prevention
• Time-window filtering (15 seconds) to process only recent messages
• Continuous polling with 10-second intervals

Setup Instructions

Prerequisites

1. n8n Instance: Ensure you have n8n installed and running
2. Telegram Bot: Create a new bot via @BotFather on Telegram
3. Telegram Channel: Create or have admin access to a Telegram channel
4. Linux Environment: The workflow requires Linux for command execution

Configuration Steps

1. Obtain Telegram Bot Token

• Open Telegram and search for @BotFather
• Send /newbot and follow the prompts
• Save the bot token provided (format: 1234567890:ABCdefGHIjklMNOpqrsTUVwxyz)

2. Get Channel ID

• Add your bot as an administrator to your Telegram channel
• Send a test message to the channel
• Visit: https://api.telegram.org/bot<YOUR_BOT_TOKEN>/getUpdates
• Look for "chat":{"id":-100XXXXXXXXXX} - this is your channel ID

3. Configure the Workflow

• Import the workflow JSON into n8n
• Open the Config node
• Replace your_telegram_token with your actual bot token
• Replace your_telegram_channel_id with your channel ID
• Save the changes

4. Set Up Telegram Credentials in n8n

• Navigate to the Send Telegram Text Response node
• Click on the credentials field
• Create new Telegram credentials using your bot token
• Apply the same credentials to Send Telegram Image Response node

5. System Requirements

The workflow automatically installs required packages:

• util-linux-misc (for script command)
• curl (for downloading TGPT)
• TGPT binary (downloaded automatically from GitHub)

Activation

• Save all configuration changes
• Toggle the workflow to Active status
• The bot will start polling every 10 seconds

How to Use

Sending Commands to the Bot

Text Generation

To generate a text response, send a message to your Telegram channel with the following format:

am# Your prompt here

Example:

am# Explain quantum computing in simple terms

The bot will:

1. Remove the am# prefix
2. Send the prompt to TGPT with GPT-4 model
3. Generate a response with temperature 0.3 (more focused/deterministic)
4. Reply with the generated text in the channel

Image Generation

To generate an image, send a message with this format:

ami# Your image description here

Example:

ami# A futuristic city with flying cars at sunset

The bot will:

1. Remove the ami# prefix
2. Use TGPT to generate an image (1920x1080 resolution)
3. Save the image temporarily
4. Send the generated image to the channel

Important Usage Notes

Response Time

• The bot checks for new messages every 10 seconds
• Messages older than 15 seconds are ignored
• Expect a delay of 10-30 seconds for responses depending on generation time

Message Processing

• Only messages from the configured channel are processed
• The bot maintains a list of processed message IDs to avoid duplicates
• Maximum of 15 messages are retrieved per polling cycle

Limitations

• Text generation uses temperature 0.3 (less creative, more accurate)
• Image generation uses temperature 0.7 (more creative)
• Images are generated at 1920x1080 resolution
• The bot requires continuous n8n execution

Troubleshooting

Bot Not Responding

1. Verify the workflow is active
2. Check that the bot is an admin in the channel
3. Confirm the channel ID is correct (negative number for channels)
4. Ensure messages start with exact prefixes: am# or ami#

Duplicate Responses

• The workflow includes duplicate prevention
• If issues persist, restart the workflow to clear the processed IDs cache

Missing Dependencies

• The workflow automatically downloads TGPT on first run
• If errors occur, check the Execute nodes’ output for installation issues

Performance Issues

• Consider increasing the polling interval if server resources are limited
• Monitor the n8n execution logs for timeout errors

Advanced Configuration

Modify Polling Interval

Edit the Schedule node to change the 10-second interval

Adjust Time Window

In the Process Offset node, modify timeWindowSeconds variable (default: 15)

Change AI Model Parameters

• Text generation: Edit --temperature "0.3" in Execute - Text node
• Image generation: Edit --temperature "0.7" in Execute - Image node
• Both use --model "gtp-4" by default

Customize Image Dimensions

In Execute - Image node, modify:

• --height=1080
• --width=1920

Security Considerations

• Keep your bot token private
• Use private channels to prevent unauthorized access
• Regularly monitor bot activity through Telegram’s BotFather
• Consider implementing rate limiting for production use

Maintenance

• Regularly check n8n logs for errors
• Update TGPT version URL in Execute nodes when new versions are released
• Clear /tmp/ directory periodically to remove temporary files
• Monitor disk space for image generation temporary files

🔗 Nodes Used

HTTP Request, Telegram, Schedule Trigger, Read/Write Files from Disk

📥 Import

Download workflow.json and import into n8n: Workflow menu → Import from File

📖 Importing guide · 🔑 Credential setup