n8n Pro-Tips
21 failure modes I hit building production n8n workflows, and what actually fixed them. Written for people who have already shipped a few workflows.
no email no signup 21 entries markdown, no scripts
Don't install a stranger's skill blind. Nothing in it executes, and the PDF is the same 21 entries — read it in your browser first.
Why this exists
Most n8n failures do not throw errors. The workflow completes, the execution shows green, and the data is quietly wrong. Every time that happened, I wrote down what the error message did not explain.
What it covers
- Loops, nested loops, and recursive sub-workflows
- Item linking and data flow through Code nodes
- Merge node modes, branching, and error handling
- Binary data and HTTP file responses
- Supabase, PostgREST, and Postgres connection pooling
- Gemini schema limits and OpenRouter model fallbacks
Installing the skill
- claude.ai
- Customize → Skills → "+" → Create skill → upload the zip → toggle on. Requires code execution enabled.
- Claude Code
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Unzip into
~/.claude/skills/for personal use, or.claude/skills/inside a project.
Not using Claude? The PDF has the same content and needs no setup.