main

A project rule for using pnpm, a JavaScript package manager, and for handling errors with the SDKError class. It also says not to use npx.

In plain words
What is it for?
Use it when installing or running project packages and when writing code that catches and rethrows errors from SDK operations.
Why use it?
It keeps dependency commands and error handling consistent across the project, so failures are reported in the expected form.

Cursor rule for Cursor

Install

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.

agentmods
npx agentmods add rules/commercetools/commerce-mcp/main
Clone the repo
git clone --depth 1 https://github.com/commercetools/commerce-mcp

Made for: Cursor.

Per session 83 This file is loaded in full into every session.
When invoked 83 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00083 $0.00083
Opus 5 $0.00042 $0.00042
Sonnet 5 $0.00017 $0.00017
Haiku 4.5 $0.00008 $0.00008

Measured yesterday against content hash 81487a3ee8c0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

main 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 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.

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.

Origin

This is a copy

100% identical to main — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursor/rules/main.mdc · 15 lines

What it actually says

IMPORTANT:

  • project uses pnpm as package manager.
  • do not use npx
  • always use this pattern to handle errors
    } catch (error: any) {
        throw new SDKError('Failed to read cart', error); // pass the error to SDKError instance
    }
    
Changes

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.

  1. yesterday First seen · 15 lines · 83 tokens per session scan A 81487a3ee8c0

Subscribe to this mod's changes

main is a cursor rule published in the GitHub repository commercetools/commerce-mcp (4 stars, last pushed 21d ago), licensed MIT. It adds 83 tokens to every session, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to main, differing in 0 lines, and is treated as a copy.