Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts

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1. Workflow Overview

Who's it for This workflow is for anyone who runs n8n workflows and wants to know immediately when something breaks, without digging through execution logs. Especially useful for non technical user...

Best for

DevOps automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.if, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.outputparserstructured, @n8n/n8n-nodes-langchain.lmchatanthropic, n8n-nodes-base.supabase, n8n-nodes-base.code, n8n-nodes-base.errortrigger, n8n-nodes-base.httprequest

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Flowcheckers.

Original n8n.io source

1.1 Workflow description

Title: Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts
Workflow name: Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts

Who's it for

This workflow is for anyone who runs n8n workflows and wants to know immediately when something breaks, without digging through execution logs. Especially useful for non-technical users and freelancers or agencies managing workflows for clients.

How it works

When a workflow fails, this system activates automatically. Claude AI analyzes the error using the technical details and the business context you provide, then generates a diagnosis with the direct cause, a step-by-step fix and prevention advice. A second AI agent validates the confidence score. Based on that score you receive a full diagnosis (≥80%), a diagnosis with a reservation (50–79%), or a manual review notification (<50%). All diagnoses are stored in your Supabase database.

How to set up

Run the provided SQL in Supabase to create the error_log table. Verify your domain in Resend and create an API key. Import the workflow, create four credentials (Anthropic, Supabase, Resend, n8n API) and link them to the correct nodes. Fill in the Config node and activate the workflow. Set it as the Error Workflow for each workflow you want to monitor. Full installation guide at flowcheckers.com.

Requirements

Anthropic API key, Supabase account, Resend account with verified domain.

How to customize

Add workflow_2, workflow_3 etc. in the Config node for additional workflows. Adjust the email templates in the Resend nodes to match your branding.

Need the full installation guide including SQL code? Download it free at flowcheckers.com

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - IF — Confidence ≥ 80?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2

Block 2 - IF — Confidence ≥ 50?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2

Block 3 - Claude Scoring Judge

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 4 - Claude Diagnosis

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3.1

Block 5 - Structured Output Parser 2

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.3

Block 6 - Haiku 4.5 fallback 2

Type / Role: @n8n/n8n-nodes-langchain.lmChatAnthropic - lmChatAnthropic
Config choices: Version 1.3

Block 7 - Haiku 4.5 fallback 1

Type / Role: @n8n/n8n-nodes-langchain.lmChatAnthropic - lmChatAnthropic
Config choices: Version 1.3

Block 8 - Sonnet 4.6 - 2

Type / Role: @n8n/n8n-nodes-langchain.lmChatAnthropic - lmChatAnthropic
Config choices: Version 1.3

Block 9 - Sonnet 4.6 - 1

Type / Role: @n8n/n8n-nodes-langchain.lmChatAnthropic - lmChatAnthropic
Config choices: Version 1.3

Block 10 - If

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 11 - Supabase - Get historical context

Type / Role: n8n-nodes-base.supabase - supabase
Config choices: Version 1

Block 12 - Code - Prepare context

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 13 - Structured Output Parser

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.3

Block 14 - Code - Merge output

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 15 - Supabase - Save diagnosis

Type / Role: n8n-nodes-base.supabase - supabase
Config choices: Version 1

Block 16 - Error Trigger

Type / Role: n8n-nodes-base.errorTrigger - errorTrigger
Config choices: Version 1

Block 17 - HTTP Request - Get workflow JSON

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 18 - Code - Build context

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 19 - New error notification

Type / Role: n8n-nodes-resend.resend - resend
Config choices: Version 1

Block 20 - Full diagnosis email

Type / Role: n8n-nodes-resend.resend - resend
Config choices: Version 1

Block 21 - Diagnosis with reservation email

Type / Role: n8n-nodes-resend.resend - resend
Config choices: Version 1

Block 22 - Error notification low confidence

Type / Role: n8n-nodes-resend.resend - resend
Config choices: Version 1

Block 23 - Alert: context missing

Type / Role: n8n-nodes-resend.resend - resend
Config choices: Version 1

Block 24 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Showing the first 24 of 34 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts
Complexity	advanced
Nodes	34
Categories	DevOps, AI Summarization
Author	Flowcheckers
Published	05 May 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15484/15484.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source DevOps workflows AI Summarization workflows

Frequently asked questions

What does Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your DevOps, AI Summarization use case.

Flowcheckers

3 workflows

Nodes

n8n-nodes-base.if @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.outputparserstructured @n8n/n8n-nodes-langchain.lmchatanthropic n8n-nodes-base.supabase n8n-nodes-base.code n8n-nodes-base.errortrigger n8n-nodes-base.httprequest

Complexity

advanced

Published 05 May 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/15484/15484.json

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Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Who's it for

How it works

How to set up

Requirements

How to customize

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - IF — Confidence ≥ 80?

Block 2 - IF — Confidence ≥ 50?

Block 3 - Claude Scoring Judge

Block 4 - Claude Diagnosis

Block 5 - Structured Output Parser 2

Block 6 - Haiku 4.5 fallback 2

Block 7 - Haiku 4.5 fallback 1

Block 8 - Sonnet 4.6 - 2

Block 9 - Sonnet 4.6 - 1

Block 10 - If

Block 11 - Supabase - Get historical context

Block 12 - Code - Prepare context

Block 13 - Structured Output Parser

Block 14 - Code - Merge output

Block 15 - Supabase - Save diagnosis

Block 16 - Error Trigger

Block 17 - HTTP Request - Get workflow JSON

Block 18 - Code - Build context

Block 19 - New error notification

Block 20 - Full diagnosis email

Block 21 - Diagnosis with reservation email

Block 22 - Error notification low confidence

Block 23 - Alert: context missing

Block 24 - Sticky Note

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions