cursorrules

cursorrules is a cursor rule for Cursor from shacharsol/js-package-manager-mcp. It costs 482 tokens per session, scanned A, original, MIT.

A set of rules and tools for managing JavaScript packages from an editor that supports MCP, a standard way for software tools to communicate with AI assistants.

In plain words
What is it for?
Use it to find npm packages, inspect their details, manage project dependencies, check vulnerabilities, review bundle-size impact, and examine dependency trees.
Why use it?
It keeps package search, installation, updates, removal, security checks, licensing, and dependency analysis in one workflow.

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/shacharsol/js-package-manager-mcp/cursorrules
Clone the repo
git clone --depth 1 https://github.com/shacharsol/js-package-manager-mcp

Made for: Cursor.

Wrote 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.

agentmods badge for cursorrules

README.md
[![agentmods](https://agentmods.dev/badge/rules/shacharsol/js-package-manager-mcp/cursorrules.svg)](https://agentmods.dev/rules/shacharsol/js-package-manager-mcp/cursorrules)
Your own site
<a href="https://agentmods.dev/rules/shacharsol/js-package-manager-mcp/cursorrules"><img src="https://agentmods.dev/badge/rules/shacharsol/js-package-manager-mcp/cursorrules.svg" alt="Measured on agentmods" height="20"></a>
Per session 482 This file is loaded in full into every session.
When invoked 482 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found 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 $0.00482 $0.00482
Opus 5 $0.00241 $0.00241
Sonnet 5 $0.00096 $0.00096
Haiku 4.5 $0.00048 $0.00048

Measured 3d ago against content hash 71ee46b6ca2d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cursorrules 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 3d 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.

.cursorrules · 79 lines

What it actually says

NPM Plus MCP Integration

This project includes NPM Plus - an AI-powered JavaScript package manager that integrates with MCP-compatible editors.

Available Service

Available MCP Tools

Package Search & Info

  • search_packages - Search npm registry with intelligent relevance scoring
  • package_info - Get detailed package metadata, dependencies, and maintainer info

Package Management

  • install_packages - Install packages with dev/global options
  • update_packages - Update packages to latest versions
  • remove_packages - Clean removal of packages

Security & Analysis

  • audit_dependencies - Scan for vulnerabilities using GitHub Advisory Database
  • check_vulnerability - Check specific packages for security issues
  • check_bundle_size - Analyze package size impact before installation
  • download_stats - Get package popularity and download statistics

Advanced Analysis (Local only)

  • dependency_tree - Visualize dependency relationships
  • list_licenses - License compliance analysis
  • analyze_dependencies - Detect circular dependencies and orphaned files

Usage Examples

Ask the AI assistant:

  • "Search for React testing libraries"
  • "What's the bundle size of lodash?"
  • "Check if express has any security vulnerabilities"
  • "Install typescript as a dev dependency"
  • "Show me alternatives to moment.js"
  • "Audit my project dependencies for security issues"

Configuration

For Cursor MCP integration, add to your MCP settings:

{
  "mcp": {
    "servers": {
      "npmplus-mcp": {
        "transport": "http", 
        "url": "https://api.npmplus.dev/mcp"
      }
    }
  }
}

Local Development

To use the local version instead of hosted:

npm install
npm run build  
npm start

Then update MCP config to use local server:

{
  "mcp": {
    "servers": {
      "npmplus-mcp": {
        "command": "node",
        "args": ["./dist/index.js"],
        "cwd": "/path/to/this/project"
      }
    }
  }
}
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. 3d ago First seen · 79 lines · 482 tokens per session scan A 71ee46b6ca2d

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository shacharsol/js-package-manager-mcp (9 stars, last pushed 1y ago), licensed MIT. It adds 482 tokens to every session, about $0.0024 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.