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/shacharsol/js-package-manager-mcp/cursorrulesgit clone --depth 1 https://github.com/shacharsol/js-package-manager-mcpWrote 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/rules/shacharsol/js-package-manager-mcp/cursorrules)<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>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 | $0.00482 | $0.00482 |
| Opus 5 | $0.00241 | $0.00241 |
| Sonnet 5 | $0.00096 | $0.00096 |
| Haiku 4.5 | $0.00048 | $0.00048 |
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.
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
- Hosted Service: https://api.npmplus.dev/mcp
- Local Development: Available via
npm start(requires build)
Available MCP Tools
Package Search & Info
search_packages- Search npm registry with intelligent relevance scoringpackage_info- Get detailed package metadata, dependencies, and maintainer info
Package Management
install_packages- Install packages with dev/global optionsupdate_packages- Update packages to latest versionsremove_packages- Clean removal of packages
Security & Analysis
audit_dependencies- Scan for vulnerabilities using GitHub Advisory Databasecheck_vulnerability- Check specific packages for security issuescheck_bundle_size- Analyze package size impact before installationdownload_stats- Get package popularity and download statistics
Advanced Analysis (Local only)
dependency_tree- Visualize dependency relationshipslist_licenses- License compliance analysisanalyze_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"
}
}
}
}
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.
- 3d ago First seen · 79 lines · 482 tokens per session scan A 71ee46b6ca2d
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.
Other cursor rules, from other repositories
angular-20
This rule provides comprehensive best practices and coding standards for Angular development, focusing on modern TypeScript, standalone components, signals, and performance optimizations.
dev-standard
Apache Superset development standards and guidelines for Cursor IDE.
cli-error-handling
CLI command error handling patterns.
prefer-direct-imports-over-module-mocks
Prefer extracting a testable core over vi.mock / vi.resetModules when unit tests need to reach production logic entangled with config, env, or singletons.
control-plane-descriptors
Control plane descriptor and instance implementation patterns.
family-instance-domain-actions
Family instance domain action implementation patterns.