7 Silent Failures in n8n AI Workflows (and the Error Trigger Setup That Catches Them)

Description and use

<p>A normal n8n workflow fails the way you'd expect. A node errors, the execution turns red, and you go and fix it.</p> <p>Workflows with an LLM in the middle fail differently. The model returns <em>something</em>, the HTTP node is happy, the Code node is happy, and the run turns green. Then a few days later someone asks why the invoice sheet has a row with no invoice number and a total of ₹18,000 on an ₹11,800 bill.</p> <p>I wanted to know how many of these failures my own workflows would actually catch, so I tested it.</p> <h2> The test setup </h2> <ul> <li> <strong>n8n 1.123.84</strong>, se

Problem

<p>A normal n8n workflow fails the way you'd expect. A node errors, the execution turns red, and you go and fix it.</p> <p>Workflows with an LLM in the middle fail differently. The model returns <em>something</em>, the HTTP node is happy, the Code node is happy, and the run turns green. Then a few days later someone asks why the invoice sheet has a row with no invoice number and a total of ₹18,000 on an ₹11,800 bill.</p> <p>I wanted to know how many of these failures my own workflows would actually catch, so I tested it.</p> <h2> The test setup </h2> <ul> <li> <strong>n8n 1.123.84</strong>, se

Outcome

<p>A normal n8n workflow fails the way you'd expect. A node errors, the execution turns red, and you go and fix it.</p> <p>Workflows with an LLM in the middle fail differently. The model returns <em>something</em>, the HTTP node is happy, the Code node is happy, and the run turns green. Then a few days later someone asks why the invoice sheet has a row with no invoice number and a total of ₹18,000 on an ₹11,800 bill.</p> <p>I wanted to know how many of these failures my own workflows would actually catch, so I tested it.</p> <h2> The test setup </h2> <ul> <li> <strong>n8n 1.123.84</strong>, se

Evidence

7 Silent Failures in n8n AI Workflows (and the Error Trigger Setup That Catches Them)

Source