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

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.

Related MCP server: Pub.dev MCP Server

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.