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MCP builder

Listed by its author as mcp-builder

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…

by anthropics · Apache-2.0 · 190k GitHub stars

DoesPrompts, agents and LLMsBackend and APIs

Source on GitHub ↗
curl -fsSL https://api.cheatcodehq.com/install.sh | sh -s -- anthropic-mcp-builder --to all

Copies 1 skill into each app's skills folder (Claude Code: ~/.claude/skills), after checking every file against anthropics/skills at commit 3337550. Nothing else on your computer changes. To undo it, run the terminal command with --uninstall at the end; that also removes what the app added.

Then start a new session in your AI app and ask for the work in plain words; it picks the skill from its description. In Claude Code you can also type /anthropic-mcp-builder:mcp-builder.

See it in use

One real session, replayed step by step: the request, each step at the moment it happened, and the answer, unedited. Long waits are shown faster, with the real time in the corner. Sample API reference and meeting notes invented for this example: Acme Notes is a fictional note-taking app and its API is not a real service.
The result
mcp-plan.mdWhat the session produced: mcp-plan.md, the file the session saved.

A plan engineers can build from: four tools with inputs and outputs, what stays out and why, and API fixes in order.

mcp-plan.md, the file the session saved.

Open the whole result
Try it

After installing, start a new session and say: Here is our API reference (api.md). Plan an MCP server so Claude can use it: which tools, what each takes and returns, and what to leave out. Save it as mcp-plan.md.

What else it can do, and its limits
  • One skill, a guide for building MCP servers that let an AI app use an outside service
  • Covers planning, tool naming, inputs and outputs, paging, error messages, safety hints and how to test with evaluation questions
  • Includes reference guides for TypeScript and Python servers, and scripts to run evaluations
  • Building, testing and running the server needs a terminal and a developer; its research step also reads the MCP and SDK docs on the web
  • Without a terminal, as in this recording, it can still plan the server or review a design from your files

Sample input Recorded Oct 24, 2026 in Claude Code 2.1.308 with Sonnet 5.5. The video replays that session; nothing in it was acted or edited.

What's inside 1 skill

  • mcp-builderGuide 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).

    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).

About

Public repository for Agent Skills

Where this comes from. The public repository anthropics/skills at commit 3337550, under its Apache-2.0 license, copied without changes. anthropics is not affiliated with Cheatcode and has not claimed this listing yet. New releases are repackaged after review, never synced automatically. If this is your project, write to admin@cheatcodehq.com to claim or remove it.

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Versions

v0.0.0-g3337550Listed from anthropics/skills at 3337550 · 2026-09-28