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-core-apigit 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-core-api)<a href="https://agentmods.dev/skills/impertio-studio/n8n-claude-skill-package/n8n-core-api"><img src="https://agentmods.dev/badge/skills/impertio-studio/n8n-claude-skill-package/n8n-core-api/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-core-api"><img src="https://agentmods.dev/badge/skills/impertio-studio/n8n-claude-skill-package/n8n-core-api.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 | $0.00130 | $0.02445 |
| Opus 5 | $0.00065 | $0.01222 |
| Sonnet 5 | $0.00026 | $0.00489 |
| Haiku 4.5 | $0.00013 | $0.00245 |
Grade A, and why
n8n-core-api scanned grade A 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X GET \ How it starts
The opening of the file, as written. The whole thing — 276 lines — stays where its author put it; the contents beside it link to each section on GitHub.
n8n-core-api
Quick Reference
API Fundamentals
| Aspect | Value |
|---|---|
| Base URL | <N8N_HOST>:<N8N_PORT>/<N8N_PATH>/api/v1/ |
| Authentication | X-N8N-API-KEY header |
| Content-Type | application/json |
| Pagination | Cursor-based (nextCursor field) |
| Max page size | 250 results |
| Default page size | 100 results |
| API Playground | <base-url>/api/v1/docs (Scalar UI) |
| Availability | Requires a paid plan (not available during free trial) |
Resource Endpoints Overview
| Resource | CRUD | Special Operations |
|---|---|---|
| Workflows | GET, POST, PUT, DELETE | activate, deactivate, transfer, tags, versions |
| Executions | GET, DELETE | retry, stop, stop-bulk, tags |
| Credentials | GET, POST, PUT, DELETE | transfer, credential-type schema |
| Users | GET | role management |
| Tags | GET, POST, PUT, DELETE | — |
| Variables | GET, POST, PUT, DELETE | — |
| Projects | GET, POST, PUT, DELETE | user management |
| Audit | POST | security audit |
| Source Control | POST | pull from source control |
Critical Warnings
NEVER use offset-based pagination -- n8n uses cursor-based pagination exclusively. ALWAYS use the nextCursor value from the response to fetch the next page.
NEVER hardcode API keys in source code or commit them to version control. ALWAYS use environment variables or secret management systems to store API keys.
NEVER use limit values greater than 250 -- the API silently caps at 250 results per page. ALWAYS implement cursor-based pagination for large result sets.
NEVER attempt to delete a running execution -- the API returns an error. ALWAYS stop the execution first with POST /executions/:id/stop, then delete it.
NEVER assume API access is available on free trial instances -- the public REST API requires a paid plan.
Authentication
API Key Creation
- Navigate to Settings > n8n API in the n8n UI
- Select Create API Key
- Provide a label and set an expiration period
- On enterprise plans, select specific scopes for resource access
- Copy the generated key immediately (it is shown only once)
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 · 276 lines · 130 tokens per session scan A 2f7b97ebeb07
n8n-core-api is a skill published in the GitHub repository Impertio-Studio/n8n-Claude-Skill-Package (3 stars, last pushed 2mo ago), licensed MIT. It adds 130 tokens to every session and 2,445 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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