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 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/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/workflow-builder"><img src="https://agentmods.dev/badge/skills/n8n-io/n8n/workflow-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 5 findings, 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 Prompt Injection · line 289 Subtle instructions detected that may alter agent decision-making or introduce hidden biases.Fix: Review content for implicit steering or bias. Ensure instructions are explicit and align with the skill's stated purpose.
- medium Excessive Agency · line 351 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.
- medium Excessive Agency · line 429 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.
- medium Excessive Agency · line 433 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.
- medium Excessive Agency · line 583 Skill grants unrestricted tool access without appropriate constraints. An agent with unfettered tool access can perform arbitrary actions including file modification, network requests, and code execution.Fix: Restrict tool access to only the tools required for the skill's stated purpose. Use an explicit allowlist rather than granting blanket access.
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 | $0.00199 | $0.13583 |
| Opus 5.5 | $0.00080 | $0.05433 |
| Sonnet 5.5 | $0.00040 | $0.02717 |
| Haiku 4.5 | $0.00020 | $0.01358 |
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
10 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.
- references/compositional-workflows.md 2.4 KB
- references/config-eval-playbook.md 5.3 KB
- references/config-evals.md 5.8 KB
- references/credential-recipe-research.md 4.2 KB
- references/credential-setup-with-computer-use.md 3.6 KB
- references/error-workflows.md 1.9 KB
- references/model-selection.md 5.9 KB
- references/one-off-operations.md 8.3 KB
- references/post-build-flow.md 42 KB
- references/trigger-input-data-shapes.md 1.7 KB
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 · +4 lines · +24 tokens per session 3481d6267a8e
- 2d ago Changed · +1 lines 1e9735c702e9
- 13d ago Changed · +1 lines · +28 tokens per session 58b9d591aca2
- 20d ago Changed · +16 lines b9693490193a
- 21d ago Changed 9c605907e892
- 28d ago Changed · +10 lines 450f9c93ce1e
- 1mo ago Changed · +5 lines · +34 tokens per session c3e1c08db81c
- 1mo ago Changed · +4 lines b0329b8497f0
- 1mo ago Changed · +6 lines 9ad27d027a77
- 1mo ago First seen · 1,006 lines · 113 tokens per session scan B 0ce498c4ad23
workflow-builder is a skill published in the GitHub repository n8n-io/n8n (208,052 stars, last pushed today), with no licence file. It adds 199 tokens to every session and 13,583 once invoked, about $0.0008 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
n8n-workflows
Use when n8n workflow automation — nodes, triggers, expressions, credentials, webhooks, error handling. Use when working with n8n workflows.
notion
Use the Notion API to create/read/update pages, data sources (databases), and blocks.
automation-builder
Use this when the user wants a recurring check, scheduled task, monitoring workflow, or reusable playbook.
microsoft-365
Use the native Microsoft 365 tools for Outlook Mail, Calendar, OneDrive, and Contacts via the Microsoft Graph API.
google-workspace
Use the native Google Workspace tools for Gmail, Calendar, Drive, Docs, and Sheets.
obsidian
Obsidian vault = a normal folder on disk.