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 Impertio-Studio/n8n-Claude-Skill-Package --skill n8n-syntax-credentialsgit clone --depth 1 https://github.com/Impertio-Studio/n8n-Claude-Skill-PackageWrote 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/impertio-studio/n8n-claude-skill-package/n8n-syntax-credentials)<a href="https://agentmods.dev/skills/impertio-studio/n8n-claude-skill-package/n8n-syntax-credentials"><img src="https://agentmods.dev/badge/skills/impertio-studio/n8n-claude-skill-package/n8n-syntax-credentials/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/impertio-studio/n8n-claude-skill-package/n8n-syntax-credentials"><img src="https://agentmods.dev/badge/skills/impertio-studio/n8n-claude-skill-package/n8n-syntax-credentials.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00135 | $0.02670 |
| Opus 5 | $0.00068 | $0.01335 |
| Sonnet 5 | $0.00027 | $0.00534 |
| Haiku 4.5 | $0.00014 | $0.00267 |
Grade A, and why
n8n-syntax-credentials scanned grade A with 0 findings 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 10d ago.
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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 371 lines — stays where its author put it; the contents beside it link to each section on GitHub.
n8n-syntax-credentials
Quick Reference
ICredentialType Interface
| Property | Type | Required | Description |
|---|---|---|---|
name |
string |
YES | Internal identifier (e.g., 'myServiceApi') |
displayName |
string |
YES | GUI label shown to users |
documentationUrl |
string |
NO | Link to credentials setup docs |
properties |
INodeProperties[] |
YES | Array of credential input fields |
authenticate |
IAuthenticate |
NO | How credentials inject into requests |
test |
ICredentialTestRequest |
NO | Endpoint for credential validation |
extends |
string[] |
NO | Inherit from other credential types |
icon |
Icon |
NO | Credential icon in GUI |
iconUrl |
string |
NO | URL-based icon |
Credential Property Types
| Type | Use Case | Example |
|---|---|---|
'string' |
API keys, tokens, URLs | { type: 'string', typeOptions: { password: true } } |
'number' |
Port numbers, numeric IDs | { type: 'number', default: 443 } |
'boolean' |
Feature toggles | { type: 'boolean', default: false } |
'options' |
Region selectors, auth method | { type: 'options', options: [...] } |
'hidden' |
Internal values, computed tokens | { type: 'hidden', typeOptions: { expirable: true } } |
authenticate: 4 Injection Methods
| Method | Target | Key in properties |
|---|---|---|
| Query string | URL parameters | qs |
| Header | HTTP headers | headers |
| Request body | POST body | body |
| Basic auth | Authorization header | auth |
ALL methods require type: 'generic' as the authenticate type.
Credential Expression Syntax
Access credential values inside authenticate using: ={{$credentials.fieldName}}
For header values with prefixes: '=Bearer {{$credentials.apiKey}}'
Critical Warnings
ALWAYS set typeOptions: { password: true } on sensitive fields (API keys, tokens, passwords) -- n8n masks these in the GUI and encrypts them at rest.
What ships with it
3 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.
- 10d ago First seen · 371 lines · 135 tokens per session scan A 1684b8e5c9e6
n8n-syntax-credentials is a skill published in the GitHub repository Impertio-Studio/n8n-Claude-Skill-Package (3 stars, last pushed 2mo ago), licensed MIT. It adds 135 tokens to every session and 2,670 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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