Is the MCP Builder skill free?

Yes. The skill itself is free from anthropics/skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the MCP Builder SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 4/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install MCP Builder?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use MCP Builder with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

MCP Builder

Build MCP servers that connect Claude to your tools.

by Anthropic · anthropics/skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jun 20, 2026
Environment: Claude Code 2.x
Upstream re-checked: Aug 10, 2026 · 8a1a77a

Built a working MCP server wrapping an internal REST API, with tool schemas and error handling, in about an hour of supervised work.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 4/5
Output vs. baseline 8/10
Docs & honesty 5/5

What MCP Builder does

Guides Claude through building Model Context Protocol servers — tool definitions, schemas, auth, error handling. The fastest route to connecting Claude to internal APIs.

How to install MCP Builder

git clone https://github.com/anthropics/skills
cd skills
mkdir -p ~/.claude/skills
cp -r skills/mcp-builder ~/.claude/skills/

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger MCP Builder

/mcp-builder Build MCP servers that connect Claude to your tools.

It also activates on plain-language prompts like these:

Build an MCP server that connects Claude to our internal API
Define tool schemas and auth for a new MCP server
Add error handling to this MCP server's tool definitions

Appears in

Skills for Developers

Frequently asked questions

Is the MCP Builder skill free?: Yes. The skill itself is free from anthropics/skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does MCP Builder work with Claude Code?: We tested it with Claude Code 2.x on Jun 20, 2026. Verdict: Tested · Works. Built a working MCP server wrapping an internal REST API, with tool schemas and error handling, in about an hour of supervised work.
What is the MCP Builder SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 4/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install MCP Builder?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use MCP Builder with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.