Package Registry MCP

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MCP server for searching and getting up-to-date information about NPM, Cargo, PyPi, and NuGet packages.
Author:@artmann
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Package Registry MCP Server

A Model Context Protocol (MCP) server that enables AI assistants and agents (Claude, Cursor, Copilot, etc.) to search package registries and retrieve up-to-date package information.

Getting Started

Cursor

Install MCP Server

Alternatively, in Cursor, you can configure MCP servers in your settings:

  1. Open Cursor Settings (Cmd/Ctrl + ,)
  2. Search for "MCP" or go to Extensions > MCP
  3. Add a new server with:
    • Name: package-registry
    • Command: npx
    • Args: ["-y", "package-registry-mcp"]

Claude Code

For Claude Code, run the following command in your terminal:

claude mcp add package-registry 'npx -y package-registry-mcp'

After configuration, you'll have access to package search and information tools.

Claude Desktop

Add this server to your Claude Desktop by adding the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "package-registry": {
      "command": "npx",
      "args": ["-y", "package-registry-mcp"]
    }
  }
}

The config file is typically located at:

  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
  • Windows: %APPDATA%\Claude\claude_desktop_config.json

After adding the configuration, restart Claude Desktop.

Features

  • Search NPM packages
  • Get detailed NPM package information
  • Search crates.io (Rust package registry)
  • Get detailed crate information
  • Search NuGet packages (.NET package registry)
  • Get detailed NuGet package information
  • Get detailed PyPI package information (Python package registry)
  • Get detailed Go module information (Go package registry)
  • Real-time data directly from package registries

Available Tools

NPM Tools

search-npm-packages

Search the NPM registry for packages matching a query.

Parameters:

  • query (string): Search term for packages
  • limit (number, optional): Maximum number of results (1-100, default: 10)

Example:

bun tool search-npm-packages '{"query": "react", "limit": 5}'

get-npm-package-details

Get detailed information about a specific NPM package.

Parameters:

  • name (string): Exact crate name

Example:

bun tool get-npm-package-details '{"name": "react"}'

Returns detailed information including:

  • Package metadata (name, description, version, license)
  • Dependencies (runtime, dev, peer)
  • Maintainer information
  • Repository and homepage links
  • Last 50 versions (newest first)

list-npm-package-versions

List all versions of a specific NPM package.

Parameters:

  • name (string): Exact crate name
  • limit (number, optional): Maximum number of versions to return (1-1000, default: 100)

Example:

bun tool list-npm-package-versions '{"name": "react", "limit": 50}'

Returns:

  • Package name and total version count
  • All versions sorted by release date (newest first)
  • Latest version information

crates.io Tools

search-cargo-packages

Search crates.io for Rust crates matching a query.

Parameters:

  • query (string): Search term for crates
  • limit (number, optional): Maximum number of results (1-100, default: 10)

Example:

bun tool search-cargo-packages '{"query": "serde", "limit": 5}'

get-cargo-package-details

Get detailed information about a specific crate from crates.io.

Parameters:

  • name (string): Exact crate name

Example:

bun tool get-cargo-package-details '{"name": "serde"}'

Returns detailed information including:

  • Crate metadata (name, description, version, license)
  • Keywords and categories
  • Download statistics (total and recent)
  • Features and crate size
  • Repository, homepage, and documentation links
  • Last 50 versions (newest first)

list-cargo-package-versions

List all versions of a specific crate from crates.io.

Parameters:

  • name (string): Exact crate name
  • limit (number, optional): Maximum number of versions to return (1-1000, default: 100)

Example:

bun tool list-cargo-package-versions '{"name": "serde", "limit": 50}'

Returns:

  • Crate name and total version count
  • All versions sorted by release date (newest first)
  • Latest and max stable version information

NuGet Tools

search-nuget-packages

Search the NuGet registry for .NET packages matching a query.

Parameters:

  • query (string): Search term for packages
  • limit (number, optional): Maximum number of results (1-100, default: 10)

Example:

bun tool search-nuget-packages '{"query": "newtonsoft", "limit": 5}'

get-nuget-package-details

Get detailed information about a specific NuGet package.

Parameters:

  • name (string): Exact package name

Example:

bun tool get-nuget-package-details '{"name": "Newtonsoft.Json"}'

Returns detailed information including:

  • Package metadata (name, description, version, license)
  • Authors and project information
  • Target frameworks and dependencies
  • Download statistics and verification status
  • Project, license, and icon URLs
  • Last 50 versions (newest first)

list-nuget-package-versions

List all versions of a specific NuGet package.

Parameters:

  • name (string): Exact package name
  • limit (number, optional): Maximum number of versions to return (1-1000, default: 100)

Example:

bun tool list-nuget-package-versions '{"name": "Newtonsoft.Json", "limit": 50}'

Returns:

  • Package name and total version count
  • All versions sorted by release date (newest first)
  • Latest version information

PyPI Tools

Note: PyPI does not provide a JSON search API, so only package details and version listing are supported. For searching, please use the PyPI website directly at https://pypi.org/search/.

get-pypi-package-details

Get detailed information about a specific PyPI package.

Parameters:

  • name (string): Exact package name

Example:

bun tool get-pypi-package-details '{"name": "requests"}'

Returns detailed information including:

  • Package metadata (name, description, version, license)
  • Author and maintainer information
  • Dependencies and Python version requirements
  • Classifiers and keywords
  • Project URLs and documentation links
  • Download statistics
  • Vulnerability information
  • Last 50 versions (newest first)

list-pypi-package-versions

List all versions of a specific PyPI package.

Parameters:

  • name (string): Exact package name
  • limit (number, optional): Maximum number of versions to return (1-1000, default: 100)

Example:

bun tool list-pypi-package-versions '{"name": "django", "limit": 50}'

Returns:

  • Package name and total version count
  • All versions sorted by release date (newest first)
  • Latest version information

Go Tools

Note: pkg.go.dev does not provide a JSON search API, so only package details and version listing are supported. For searching, please use the pkg.go.dev website directly at https://pkg.go.dev/search/.

get-golang-package-details

Get detailed information about a specific Go module/package.

Parameters:

  • module (string): Exact module path (e.g., "github.com/gin-gonic/gin")

Example:

bun tool get-golang-package-details '{"module": "github.com/gin-gonic/gin"}'

Returns detailed information including:

  • Module path and latest version
  • Publication date and repository information
  • VCS (version control system) details
  • pkg.go.dev and go get command links
  • Last 50 versions (newest first)

list-golang-package-versions

List all versions of a specific Go module/package.

Parameters:

  • module (string): Exact module path
  • limit (number, optional): Maximum number of versions to return (1-1000, default: 100)

Example:

bun tool list-golang-package-versions '{"module": "github.com/gorilla/mux", "limit": 50}'

Returns:

  • Module path and total version count
  • All versions sorted by release date (newest first)
  • Latest version information

Installation

Install the package globally:

npm install -g package-registry-mcp

Or use directly with npx (no installation required):

npx package-registry-mcp

Development

npm install
# or
bun install
# or
yarn install

Development

# Install dependencies
bun install

# Build the server
bun run build

# Format code
bun run format

# Test individual MCP tools
bun tool <tool-name> <json-arguments>
# NPM Examples:
# bun tool search-npm-packages '{"query": "react"}'
# bun tool get-npm-package-details '{"name": "react"}'
# bun tool list-npm-package-versions '{"name": "react", "limit": 50}'
# crates.io Examples:
# bun tool search-cargo-packages '{"query": "serde"}'
# bun tool get-cargo-package-details '{"name": "serde"}'
# bun tool list-cargo-package-versions '{"name": "serde", "limit": 50}'
# NuGet Examples:
# bun tool search-nuget-packages '{"query": "newtonsoft"}'
# bun tool get-nuget-package-details '{"name": "Newtonsoft.Json"}'
# bun tool list-nuget-package-versions '{"name": "Newtonsoft.Json", "limit": 50}'
# PyPI Examples:
# bun tool get-pypi-package-details '{"name": "requests"}'
# bun tool list-pypi-package-versions '{"name": "django", "limit": 50}'
# Go Examples:
# bun tool get-golang-package-details '{"module": "github.com/gin-gonic/gin"}'
# bun tool list-golang-package-versions '{"module": "github.com/gorilla/mux", "limit": 50}'

Requirements

  • Node.js 18+ or Bun runtime
  • Internet connection for package registry access

License

See LICENSE file for details.

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