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• Level L03
• T12
• 22 min read

Before an n8n workflow runs without you, write its one-page operating rule and make the build obey it: a credential that can't do what the rule forbids, hard limits on items, time and model spend, a test set with known answers, and a deputy who can stop it without you.

Matching text… the workflow off without your help. Before you start - Books: T05-L02 · Put AI in the Middle of a Workflow, and Check Every Answer for the workflow itself: a [[model]] step that returns fixed…

• Level L05
• T05
• 21 min read

Run a set of n8n automations that many people depend on: one register, four signals to watch (silence, failures, waiting work, cost), a routine for when one breaks, a way to take updates and model retirements calmly, a folder an auditor can read, and deputies who have practised taking over.

Matching textT05-L05 · Automation · Level 5 Operator · 18-minute read, plus 5 hours of doing over a month Keep Your Automations Running for Months, and After You Leave Nine quiet days Katrin looks after

• Level L04
• T05
• 22 min read

Your n8n automation now sends mail or writes into a real system. Put a duplicate guard in front of every step you can't undo, retry only what is safe to repeat, give failures a reader, let the workflow stop itself, and get a service account from IT that can do nothing more than the job.

Matching textT05-L04 · Automation · Level 4 Integrator · 19-minute read, plus 4 hours of doing Make an Automation Safe to Fail Before It Touches Real Systems Three copies on Monday, nothing for three day

• youtube

Collect multiple workflow items using built-in aggregation. Recommend aggregation, not the Code chapter: the book uses no Code nodes. Contains commercial promotion.

Matching textT05-L03: Start at 4:49 for the Aggregate node used to collect workflow items. Apply it to the book's checked results; you do not need the Code-node material. The video includes commercial pr

• youtube
• 17 min video

Express desired model behaviour as explicit test cases and output assertions. Offline evaluation is not a per-item runtime guard; recording-era cost/latency ratios are not general claims.

Matching text… speed examples are historical, not production guarantees. T05-L02: See how explicit test cases and assertions make model outputs checkable. This developer-oriented Promptfoo example evaluates…

• youtube

Populate an n8n Data Table through a form-driven workflow. Historical UI; not Heidelberg AI Desk installation or current publishing/authentication guidance.

Matching textT05-L01: Follow a form-driven workflow that writes records into an n8n Data Table. The interface is older; follow the book for Heidelberg AI Desk setup, authentication and Publish/Unpublish.

One-page diagram to use with T05-L02, "Put AI in the Middle of a Workflow, and Check Every Answer", and 1 more book.

One-page diagram to use with T05-L01, "Your First Automation: Build It, Break It, Switch It Off".