plugin official · Anthropic

mcp-server-dev — Claude Code plugin: skills for building MCP servers

Q: How do I install mcp-server-dev in Claude?

Add the marketplace first: `/plugin marketplace add anthropics/claude-plugins-official`, then install the plugin: `/plugin install mcp-server-dev@claude-plugins-official`.

Q: How do the three skills differ?

`build-mcp-server` is the entry point and router, `build-mcp-app` handles in-chat UI widgets, and `build-mcpb` bundles a local stdio server with its runtime.

Three skills that take you from "what am I even connecting to" to a working MCP server with tools, auth and, if you want them, in-chat widgets.

Install into Claude Code · Plugin marketplace All methods and platforms ↓

/plugin install mcp-server-dev@claude-plugins-official
/plugin marketplace add anthropics/claude-plugins-official

Open on GitHub

What mcp-server-dev does

The plugin ships three skills that compose into one build path. build-mcp-server is the front door: it interrogates the use case, picks a deployment model (remote HTTP, MCPB or local stdio), picks a tool-design pattern and routes to a specialized skill. build-mcp-app adds interactive UI widgets — forms, pickers, confirm dialogs rendered inline in chat — and works on remote servers and MCPB bundles. build-mcpb packages a local stdio server with its runtime so users can install it without Node or Python.

From your answers the entry skill recommends one of four paths. For anything wrapping a cloud API it points at remote streamable-HTTP and scaffolds it inline. Need in-chat UI? It hands off to build-mcp-app. Server has to touch the local machine? That goes to build-mcpb. A local stdio prototype gets scaffolded in place too, with a note about upgrading to MCPB later.

Each skill carries reference files for the parts that don't fit in the main instructions: auth flows (DCR/CIMD), tool-description writing, widget templates, manifest schemas, security hardening. It only runs in Claude — there is no other install target.

What it helps with

pick a deployment model for an MCP server that fits the use case
scaffold a remote HTTP server wrapping a cloud API
add forms and confirm dialogs inline in chat
package a local stdio server so it installs without Node or Python
work out DCR and CIMD auth flows

Example prompts for the agent

help me build an MCP server
/mcp-server-dev:build-mcp-server
I need an MCP server that reads local files — package it as MCPB

How to install mcp-server-dev

Plugin marketplace

/plugin install mcp-server-dev@claude-plugins-official

/plugin marketplace add anthropics/claude-plugins-official

Step by step, with commands for each platform: Claude Code plugins: marketplaces, installing, and building your own

Questions about mcp-server-dev

How do I install mcp-server-dev in Claude?

Add the marketplace first: /plugin marketplace add anthropics/claude-plugins-official, then install the plugin: /plugin install mcp-server-dev@claude-plugins-official.

What does mcp-server-dev do?

It walks you through designing and building an MCP server: choosing a deployment model, a tool-design pattern and an auth flow, and adding interactive widgets when you need them.

How do the three skills differ?

build-mcp-server is the entry point and router, build-mcp-app handles in-chat UI widgets, and build-mcpb bundles a local stdio server with its runtime.

Source text

mcp-server-dev · Apache-2.0

# mcp-server-dev

Skills for designing and building MCP servers that work seamlessly with Claude.

## What's inside

Three skills that compose into a full build path:

| Skill | Purpose |
|---|---|
| **`build-mcp-server`** | Entry point. Interrogates the use case, picks deployment model (remote HTTP / MCPB / local stdio), picks tool-design pattern, routes to a specialized skill. |
| **`build-mcp-app`** | Adds interactive UI widgets (forms, pickers, confirm dialogs) rendered inline in chat. Works on remote servers and MCPB bundles. |
| **`build-mcpb`** | Packages a local stdio server with its runtime so users can install it without Node/Python. For servers that must touch the local machine. |

## How it works

`build-mcp-server` is the front door. It asks what you're connecting to, who'll use it, how big the action surface is, and whether you need in-chat UI. From those answers it recommends one of four paths:

- **Remote streamable-HTTP** (the default recommendation for anything wrapping a cloud API) — scaffolded inline
- **MCP app** — hands off to `build-mcp-app`
- **MCPB** — hands off to `build-mcpb`
- **Local stdio prototype** — scaffolded inline with an MCPB upgrade note

Each skill ships reference files for the parts that don't fit in the main instructions: auth flows (DCR/CIMD), tool-description writing, widget templates, manifest schemas, security hardening.

## Usage

Ask Claude to "help me build an MCP server" and the entry skill will trigger. Or invoke directly:

```
/mcp-server-dev:build-mcp-server
```

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