Mcpb has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install Mcpb?

Mcpb supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

Mcpb provides 2 tools: Limitation, node_modules. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Mcpb?

Mcpb is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is Mcpb actively maintained?

Mcpb is recently maintained — last commit was 89 days ago. It has 2,084 GitHub stars.

Mcpb

Name: Mcpb
Author: modelcontextprotocol

Official

@anthropic-ai/mcpb · by modelcontextprotocol

Desktop Extensions: One-click local MCP server installation in desktop apps

2.1k 65.4k/wk 2 tools GitHub npm

No known CVEs

No license

Maintained

Last commit 89d ago

Works with most clients

Transport: stdio, sse, http

2 tools · ~78 tok

Grade A · 0.0% of 200K ctx

MCPpedia last refreshed this data 6h ago

Edit this pageView history

Mcpb is an MCP server that desktop Extensions: One-click local MCP server installation in desktop apps. Its tool list has not been published yet over stdio, sse and http, requires no API key, and scores 89/100 on MCPpedia's security, maintenance and efficiency rubric.

Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcpb": {
      "args": [
        "-y",
        "@anthropic-ai/mcpb"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/mcpb)](https://mcppedia.org/s/mcpb)

Read me

What Mcpb does

⚠️ IMPORTANT NOTICE: This project is being renamed from DXT (Desktop Extensions) to MCPB (MCP Bundles) > If you're looking for the DXT tools, they have been renamed to MCPB. Please update your dependencies and tooling: > - .dxt files are now .mcpb files > - @anthropic-ai/dxt package will be moved to @anthropic-ai/mcpb

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@anthropic-ai/mcpb' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

89/100across 5 weighted dimensions

How we score →

0255075100

−11

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @anthropic-ai/mcpb against OSV.dev.

Inventory

Tools (2)

Click any tool to inspect its schema.

~78 tokens total

Inventory

Prompts (1)

Prompt Template for AI Tools

A prompt template for AI tools like Claude Code to create MCP bundles following the MCPB specification, including steps to read specifications, create proper bundle structure, follow best practices, and test considerations

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcpb safe to use?: Mcpb has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install Mcpb?: Mcpb supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Mcpb do?: Mcpb provides 2 tools: Limitation, node_modules. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Mcpb?: Mcpb is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Mcpb actively maintained?: Mcpb is recently maintained — last commit was 89 days ago. It has 2,084 GitHub stars.

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Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mcpb": {
      "args": [
        "-y",
        "@anthropic-ai/mcpb"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/mcpb)](https://mcppedia.org/s/mcpb)

Read me

What Mcpb does

⚠️ IMPORTANT NOTICE: This project is being renamed from DXT (Desktop Extensions) to MCPB (MCP Bundles) > If you're looking for the DXT tools, they have been renamed to MCPB. Please update your dependencies and tooling: > - .dxt files are now .mcpb files > - @anthropic-ai/dxt package will be moved to @anthropic-ai/mcpb

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@anthropic-ai/mcpb' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

README

MCP Bundles (MCPB)

⚠️ IMPORTANT NOTICE: This project is being renamed from DXT (Desktop Extensions) to MCPB (MCP Bundles)

If you're looking for the DXT tools, they have been renamed to MCPB. Please update your dependencies and tooling:

dxt CLI is now mcpb

.dxt files are now .mcpb files

@anthropic-ai/dxt package will be moved to @anthropic-ai/mcpb

MCP Bundles (.mcpb) are zip archives containing a local MCP server and a manifest.json that describes the server and its capabilities. The format is spiritually similar to Chrome extensions (.crx) or VS Code extensions (.vsix), enabling end users to install local MCP servers with a single click.

This repository provides three components: The bundle specification in MANIFEST.md, a CLI tool for creating bundles (see CLI.md), and the code used by Claude for macOS and Windows to load and verify MCPB bundles (src/index.ts).

For developers of local MCP servers, we aim to make distribution and installation of said servers convenient
For developers of apps supporting local MCP servers, we aim to make it easy to add support for MCPB bundles

Claude for macOS and Windows uses the code in this repository to enable single-click installation of local MCP servers, including a number of end user-friendly features - such as automatic updates, easy configuration of MCP servers and the variables and parameters they need, and a curated directory. We are committed to the open ecosystem around MCP servers and believe that its ability to be universally adopted by multiple applications and services has benefits developers aiming to connect AI tools to other apps and services. Consequently, we're open-sourcing the MCP Bundle specification, toolchain, and the schemas and key functions used by Claude for macOS and Windows to implement its own support of MCP Bundles. It is our hope that the mcpb format doesn't just make local MCP servers more portable for Claude, but other AI desktop applications, too.

For Bundle Developers

At the core, MCPB are simple zip files containing your entire MCP server and a manifest.json. Consequently, turning a local MCP server into a bundle is straightforward: You just have to put all your required files in a folder, create a manifest.json, and then create an archive.

To make this process easier, this package offers a CLI that helps you with the creation of both the manifest.json and the final .mcpb file. To install it, run:

npm install -g @anthropic-ai/mcpb

In a folder containing your local MCP server, run mcpb init. This command will guide you through the creation of a manifest.json.
Run mcpb pack to create a mcpb file.
Now, any app implementing support for MCPB can run your local MCP server. As an example, open the file with Claude for macOS and Windows to show an installation dialog.

You can find the full spec for the manifest.json and all its mandatory and optional fields in MANIFEST.md. Examples for bundles can be found in examples.

Prompt Template for AI Tools

AI tools like Claude Code are particularly good at creating MCP bundles when informed about the spec. When prompting an AI coding tool to build a bundle, briefly explain what your bundle aims to do - then add the following context to your instructions.

I want to build this as a MCP Bundle, abbreviated as "MCPB". Please follow these steps:

Read the specifications thoroughly:

https://github.com/anthropics/mcpb/blob/main/README.md - MCPB architecture overview, capabilities, and integration patterns

https://github.com/anthropics/mcpb/blob/main/MANIFEST.md - Complete bundle manifest structure and field definitions

https://github.com/anthropics/mcpb/tree/main/examples - Reference implementations including a "Hello World" example

Create a proper bundle structure:

Generate a valid manifest.json f

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

89/100across 5 weighted dimensions

How we score →

0255075100

−11

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @anthropic-ai/mcpb against OSV.dev.

Inventory

Tools (2)

Click any tool to inspect its schema.

~78 tokens total

Inventory

Prompts (1)

Prompt Template for AI Tools

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcpb safe to use?: Mcpb has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install Mcpb?: Mcpb supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Mcpb do?: Mcpb provides 2 tools: Limitation, node_modules. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Mcpb?: Mcpb is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Mcpb actively maintained?: Mcpb is recently maintained — last commit was 89 days ago. It has 2,084 GitHub stars.