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MCP Server Builder

Official

Official skill that walks you through researching, implementing, testing, and evaluating high-quality MCP (Model Context Protocol) servers in TypeScript or Python.

Dev & CodingAdvanced★ 177,650⑂ 21,037AI score 8/10Last updated: Sep 22, 2026

What it does

  • Breaks MCP server development into four phases: research/planning, implementation, review/testing, and evaluation creation.
  • Codifies design principles: consistent tool naming prefixes, context-efficient responses, pagination, and actionable error messages.
  • Shows how to define input schemas with Zod/Pydantic, add outputSchema/structuredContent, and set annotations like readOnlyHint and destructiveHint.
  • Includes build/test steps (npm run build, npx @modelcontextprotocol/inspector) and a process for authoring 10 verifiable XML eval questions.
  • Pulls in bundled references: Python guide, TypeScript guide, MCP best practices, and the evaluation guide.

Who it's for

  • Backend/tooling engineers wrapping external APIs for LLM access.
  • Teams standardizing internal MCP servers against the spec.
  • Anyone wanting to benchmark an existing MCP server with an eval set.

Example uses

  1. "Build a TypeScript MCP server for our ticketing API" → project scaffold, Zod schemas, tool registration code.
  2. "Review this Python FastMCP server against MCP best practices" → naming, pagination, and error-handling fixes.
  3. "Generate 10 XML evaluation questions for my finished server" → read-only, verifiable question/answer pairs.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/anthropics/skills/HEAD/skills/mcp-builder/SKILL.md

What I want: (describe your task here)

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↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/mcp-builder folder from the GitHub repo anthropics/skills into my ~/.claude/skills/mcp-builder/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

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

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal in your working directory.
  2. Clone the official repo: git clone https://github.com/anthropics/skills.git
  3. Create the skills directory: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r skills/skills/mcp-builder ~/.claude/skills/
  5. Confirm the reference/ guides came along with it.
  6. Restart Claude Code and ask something like "help me build an MCP server" to trigger the skill.
  7. Have Node.js + npm ready for TypeScript work, or Python 3.10+ for the Python path.
View source on GitHub ↗