Free n8n Error Diagnosis Workflow

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Hi everyone​:waving_hand: Recently built an automated error diagnosis workflow for faster debugging and troubleshooting.

workflow link: Diagnose workflow errors with Claude AI, store in Supabase and email fixes | n8n workflow template

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.

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Nice share. One fast way to make this even more useful is to add a quick triage split before deeper checks:

  1. classify the error first (auth, schema/field mismatch, rate-limit, timeout, downstream validation),
  2. run one minimal check per class so users can rule out common causes in under 5 minutes,
  3. log the exact failing node + expected vs actual field for the first failing path.

If someone has one concrete broken path, I can help scope a 100 USD Automation Fix Sprint: one workflow path, diagnosis, smallest safe fix if possible, verification checklist, and short handoff note.

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The two-agent confidence validation pattern is a smart design choice - using a second AI to sanity-check the diagnosis before sending it out prevents noisy or low-confidence alerts from cluttering inboxes. Using Supabase as the persistent store also means you build a searchable error history over time, which is genuinely useful for spotting recurring failure patterns across workflows.

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Thanks a lot! :grinning_face:

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Hi everyone, I changed the layout of the sticky notes a bit. here is the new link for the workflow: https://n8n.io/workflows/15484