Diagnose n8n workflow errors with Claude AI, Supabase and Resend email alerts
UnknownUnknown. This template uses community nodes we can't verify statically. Uses community nodes that can't be verified statically (unverified community packages are off by default in 3.0). Static check, last run 2026-10-19.
Community nodes
These come from third-party npm packages. In n8n 3.0 unverified community packages are off by default (N8N_UNVERIFIED_PACKAGES_ENABLED=false).
n8n-nodes-resend(New error notification, Full diagnosis email, Diagnosis with reservation email, Error notification low confidence, Alert: context missing)
Nodes used (10)
- If
n8n-nodes-base.if - AI Agent
@n8n/n8n-nodes-langchain.agent - Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured - Anthropic Chat Model
@n8n/n8n-nodes-langchain.lmChatAnthropic - Supabase
n8n-nodes-base.supabase - Code
n8n-nodes-base.code - Error Trigger
n8n-nodes-base.errorTrigger - HTTP Request
n8n-nodes-base.httpRequest - Resend
n8n-nodes-resend.resend - Edit Fields (Set)
n8n-nodes-base.set
What it does
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 errorlog 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 workflow2, workflow3 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