Monitor n8n Workflow Errors with AI Diagnosis & Instant Telegram Alerts

This n8n template automatically catches errors from any workflow on your instance, analyzes them with Google Gemini AI, and delivers a structured diagnostic report directly to your Telegram — including error classification, root cause analysis, and specific fix steps.

If you manage multiple n8n workflows in production and want to stop manually debugging failures, this workflow is your always-on error watch.

How it works

• Error Trigger: Fires automatically whenever any workflow on the instance encounters a failure, capturing the full error context including the failed node name, error message, and stack trace.
• Set Context: Extracts all error data and holds your 3 configuration values. This is the only node you ever need to edit — making the workflow easy to adapt and redeploy.
• Get Workflow Content: Fetches the full workflow JSON definition via the n8n REST API, giving the AI meaningful context about what the failed workflow was actually trying to do.
• AI Agent (Gemini): Classifies the error type (Authentication, Rate Limit, Credential, Connection, etc.), identifies the root cause, and generates a Telegram HTML-formatted report with 2–3 actionable fix steps.
• Send Telegram Notification: Delivers the formatted report to your configured chat with proper HTML rendering — bold labels, code blocks for error messages, and a direct link to the failed execution.

How to use

1. Connect credentials: Add your Google Gemini (googlePalmApi) credential to the Google Gemini Chat Model node, and your Telegram Bot credential to the Send Telegram Notification node.
2. Configure Set Context: Open the Set Context node and update n8n_instance_url (your public n8n URL), n8n_api_key (from n8n → Settings → API), and telegram_chat_id.
3. Activate this workflow.
4. Link to other workflows: In each workflow you want to monitor, go to Settings → Error Workflow and select this workflow.

Requirements

• n8n Version: Built and tested on n8n 2.9.4+. (It is highly recommended to update to the latest n8n version.)
• Google Gemini API key (googlePalmApi credential type).
• Telegram Bot token and a chat ID to receive notifications.
• n8n API key with read access to workflows (Settings → API → Create API Key).
• Your n8n instance must be accessible via a public URL for the API call.

Customizing this workflow

• Different AI model: Swap the Google Gemini Chat Model sub-node for OpenAI, Anthropic, or any other LLM — no other changes needed.
• Different notification channel: Replace the Telegram node with Slack, Discord, or Zoho Mail to fit your team's tooling.
• Report language: Change the language instruction at the end of the AI Agent's system prompt from Vietnamese to English or any other language.
• Filter specific workflows: Add an If node after Error Trigger to only process errors from high-priority workflows based on workflow.name.

About the Author

Created by: Nguyễn Thiệu Toàn (Jay Nguyen)
Email: [email protected]
Website: nguyenthieutoan.com
Company: GenStaff (genstaff.net)
Socials (Facebook / X / LinkedIn): @nguyenthieutoan
More templates: n8n.io/creators/nguyenthieutoan