mcp-builder

mcp-builder is an open-source frontend skill for Claude Code and compatible agents, published by anthropics. Its author describes it as: “Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or service…”. The project has 167k stars on GitHub and does not declare a license, so check with the author before reuse. Add it to your setup with `/plugin marketplace add anthropics/skills`.

Installation

Add mcp-builder to your agent with:

/plugin marketplace add anthropics/skills

Always review a skill's source before installing it. This command comes from the skill's public repository; the linked repo is the source of truth for exact setup steps.

When to use it

Reach for mcp-builder when you want frontend help from your agent without writing the same instructions every session. Load the skill and the agent picks it up automatically for relevant tasks.

Strengths

• Ships in anthropics/skills, an established project with 166,577 GitHub stars
• Actively maintained (recent commits)

Things to check

• No license declared — confirm terms with the author before reuse

Topics

Frequently asked questions

What does mcp-builder do?

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

How do I install mcp-builder?

Run /plugin marketplace add anthropics/skills in your agent, then reload your skills. Review the source at https://github.com/anthropics/skills before installing.

Is mcp-builder free to use?

mcp-builder is publicly available on GitHub, but anthropics has not declared a standard open-source license (No license). Confirm the terms with the author before reusing it.

Where does mcp-builder come from?

mcp-builder ships inside anthropics/skills, a repository that contains 19 catalogued skills in total. The repository's 166,577 GitHub stars apply to that whole collection, not to this skill on its own.