** ⚠️ 重要なお知らせ:このプロジェクトはDXT(デスクトップ拡張)からMCPB(MCPバンドル)に名称を変更します**

DXTツールをお探しの場合は、MCPBに名称変更されています。依存関係とツールを更新してください:

• dxt CLIは現在mcpb
• .dxtファイルは現在.mcpbファイルに変わります
• @anthropic-ai/dxtパッケージは@anthropic-ai/mcpbに移動します。

MCPバンドル(.mcpb)は、ローカルMCPサーバーとサーバーおよびその機能を記述するmanifest.jsonを含むzipアーカイブです。この形式は、Chrome拡張機能(.crx)やVS Code拡張機能(.vsix)に精神的に似ており、エンドユーザーはワンクリックでローカルMCPサーバーをインストールできます。

このリポジトリは3つのコンポーネントを提供しています:MANIFEST.md のバンドル仕様、バンドル作成のためのCLIツール(CLI.md 参照)、そしてmacOSおよびWindowsでMCPBバンドルの読み込みと検証に使われるコード(src/index.ts)。

• ローカルMCPサーバーの開発者向けに、サーバーの配布と設置を便利にすることを目指しています
• ローカルMCPサーバーをサポートするアプリの開発者向けに、MCPBバンドルのサポートを簡単に追加できるようにすることを目指しています

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

1. In a folder containing your local MCP server, run mcpb init. This command will guide you through the creation of a manifest.json.
2. Run mcpb pack to create a mcpb file.
3. 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.