Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/n8n-io/n8n/workflow-buildernpx skills add n8n-io/n8n --skill workflow-buildergit clone --depth 1 https://github.com/n8n-io/n8nWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/n8n-io/n8n/workflow-builder)<a href="https://agentmods.dev/skills/n8n-io/n8n/workflow-builder"><img src="https://agentmods.dev/badge/skills/n8n-io/n8n/workflow-builder.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00113 | $0.12356 |
| Opus 5 | $0.00056 | $0.06178 |
| Sonnet 5 | $0.00023 | $0.02471 |
| Haiku 4.5 | $0.00011 | $0.01236 |
Grade B, and why
workflow-builder scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
Never tell the user a workflow is fixed, verified, tested, or working from a The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today Changed · +42 lines a5561563f743
- yesterday Changed · +11 lines a91a32818ba3
- 2d ago Changed · +19 lines 6b3d396f3f09
- 3d ago Changed · +16 lines 3b0340672c3f
- 5d ago First seen · 892 lines · 113 tokens per session scan B 9d9b12a0cb1c
workflow-builder is a skill published in the GitHub repository n8n-io/n8n (203,373 stars, last pushed today), with no licence file. It adds 113 tokens to every session and 12,356 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it B with 1 finding (subtle steering). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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