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MCP Builder

Official

Anthropic's official skill for researching, building, testing, and evaluating high-quality MCP servers in TypeScript or Python.

Dev & CodingAdvanced★ 167,132⑂ 19,920AI score 9/10Last updated: Aug 7, 2026

What it does

Guides Claude through a complete four-phase workflow for shipping a Model Context Protocol server:

  • Phase 1 – Research & plan: pull the MCP spec, study the target API, pick tool names with consistent prefixes, and decide between broad API coverage and higher-level workflow tools.
  • Phase 2 – Implement: TypeScript (Zod, server.registerTool) or Python (FastMCP, Pydantic) with auth clients, pagination, structured output schemas, and tool annotations like readOnlyHint and destructiveHint.
  • Phase 3 – Review & test: build checks plus MCP Inspector runs.
  • Phase 4 – Evaluate: generate 10 independent, read-only, verifiable questions in an XML eval file.

Who it's for

  • Backend/platform engineers exposing internal APIs or SaaS products to Claude
  • Developers who have written an MCP server but lack design standards
  • Tech leads who need a repeatable team playbook for MCP work

Examples

  1. "Build a TypeScript MCP server for the Stripe API" — endpoint inventory, Zod schemas, tool registration, Inspector testing.
  2. "Audit our Python MCP server" — fixes duplicated code, vague descriptions, and unhelpful error messages.
  3. "Create an evaluation suite for our server" — outputs 10 stable QA pairs as XML you can run in CI.

· · · Install guide · · ·

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.
  2. Clone the repo: git clone https://github.com/anthropics/skills.git
  3. Create the skills directory: mkdir -p ~/.claude/skills
  4. Copy the whole folder, including reference/: cp -r skills/skills/mcp-builder ~/.claude/skills/
  5. Restart Claude Code and ask something like "build an MCP server for this API" — the skill loads automatically.
  6. Keep an internet connection available, since the skill WebFetches the MCP spec and SDK READMEs.
View source on GitHub ↗