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 skills add n8n-io/n8n --skill agent-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/agent-builder)<a href="https://agentmods.dev/skills/n8n-io/n8n/agent-builder"><img src="https://agentmods.dev/badge/skills/n8n-io/n8n/agent-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/n8n-io/n8n/agent-builder"><img src="https://agentmods.dev/badge/skills/n8n-io/n8n/agent-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 110 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 5.1 | $0.00088 | $0.08622 |
| Opus 5.5 | $0.00035 | $0.03449 |
| Sonnet 5.5 | $0.00018 | $0.01724 |
| Haiku 4.5 | $0.00009 | $0.00862 |
Grade B, and why
agent-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 yesterday.
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.
call `agent_builder_publish_agent`. Never tell them to click Publish in the 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 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.
- yesterday Changed 6b946db4347f
- 2d ago Changed 2a7af9fbbe9d
- 3d ago Changed · +37 lines da95f04ee505
- 4d ago Changed · +478 lines · +12 tokens per session scan A → B 5078469592db
- 17d ago Changed · +2 lines 4dc654b84a67
- 28d ago Changed · +20 lines e5208011ed45
- 1mo ago Changed · +10 lines 44aa2ab1bbb7
- 1mo ago Changed · +6 lines 15933cdf05fa
- 1mo ago Changed · +9 lines · +3 tokens per session 71767432b629
- 1mo ago First seen · 151 lines · 73 tokens per session scan A 959267089b6a
agent-builder is a skill published in the GitHub repository n8n-io/n8n (208,412 stars, last pushed today), with no licence file. It adds 88 tokens to every session and 8,622 once invoked, about $0.0004 per session on Opus 5.5. 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.
Other skills, from other repositories
verify
Drive the real CLI (node n8n-decanter.mts ) as a subprocess against a throwaway mock n8n API — do not import lib/ modules directly.
test-driven-development
Use when implementing or changing code behavior, before writing production code.
verification-before-completion
Use when about to claim work is complete, fixed, or passing, or before committing or handing off results.
webapp-testing
Toolkit for testing local web applications and browser workflows with MCP browser tools. Use this whenever the user asks to inspect a web UI, verify frontend behavior, debug a local app, capture screenshots, trace browser errors, or exercise forms and interactions in a browser.
javascript-typescript-jest
Best practices for writing JavaScript/TypeScript tests using Jest, including mocking strategies, test structure, and common patterns.
n8n-workflow-testing-fundamentals
Comprehensive n8n workflow testing including execution lifecycle, node connection patterns, data flow validation, and error handling strategies. Use when testing n8n workflow automation applications.