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 rules/sonnd08/n8n-mcp/testgit clone --depth 1 https://github.com/sonnd08/n8n-mcpWhat 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 | $0.00229 | $0.00229 |
| Opus 5 | $0.00114 | $0.00114 |
| Sonnet 5 | $0.00046 | $0.00046 |
| Haiku 4.5 | $0.00023 | $0.00023 |
Grade A, and why
test 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 2d 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.
What it actually says
- When update or create something, always think about solutions for testing to make sure generated code working well
- MCP server must support sse
- using
mcp-remoteandmcp-remote-clientto test mcp server and list tools before confirm that new changes working
npx -p mcp-remote mcp-remote-client http://localhost:3001/mcp
- Must write down connect instruction when server start
- Using docs from https://modelcontextprotocol.io/docs/concepts/transports to implement mcp server
- make sure we do not leak any sensitive env to files that not in .gitignore
- Always using index.js as entrypoint
- All tools must have an inputSchema property
- When testing locally, need to check if .env have needed env or not, it not need to use Authorization header to authorize request to mcp server.
- Each tools/Api should be splited into a separated file
- Each API call to n8n should have a unit test
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.
- 2d ago First seen · 19 lines · 229 tokens per session scan A 004b2831893d
test is a cursor rule published in the GitHub repository sonnd08/n8n-mcp (3 stars, last pushed 12d ago), licensed MIT. It adds 229 tokens to every session, about $0.0011 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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