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MCP Server Builder Guide

A skill that walks Claude through designing, implementing, and evaluating high-quality MCP servers in Python or TypeScript.

Dev & CodingAdvanced★ 1,961⑂ 617AI score 7/10Last updated: Jul 26, 2026

What it does

Provides a four-phase playbook for building MCP (Model Context Protocol) servers that let LLMs use external APIs and services.

  • Phase 1 – Research & design: favor workflow tools over thin endpoint wrappers (e.g. a schedule_event tool that checks availability and creates the event), return high-signal output with concise/detailed modes, and write error messages that teach correct usage.
  • Phase 2 – Implementation: build shared infrastructure first (request helpers, error handling, response formatting, pagination, auth), then add tools with Pydantic (Python) or Zod (TypeScript) schemas plus readOnlyHint, destructiveHint, idempotentHint, and openWorldHint annotations.
  • Phase 3 – Review: check DRY-ness, composability, consistency, error handling, type coverage, and docstring quality.
  • Phase 4 – Evaluations: write independent, read-only, multi-call, verifiable test questions.

It also instructs Claude to WebFetch the official MCP spec and the Python/TypeScript SDK READMEs so the generated code matches current APIs.

Who it's for

  • Backend/platform engineers exposing internal APIs to Claude
  • First-time MCP server authors who need structure and ordering
  • Teams refactoring an existing MCP server's tool surface and error messages

Example uses

  1. "Build a Python FastMCP server around our ticketing REST API" → workflow tool list → Pydantic schemas → shared request helper.
  2. "Create a Notion MCP server with the TypeScript SDK and proper tool annotations" → Zod schemas with readOnly/destructive hints.
  3. "Write 10 evaluation questions to verify the MCP server I just built" → read-only, multi-tool-call test suite.

· · · 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/composio-community/awesome-claude-plugins/HEAD/mcp-builder/skills/mcp-builder/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ 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 mcp-builder/skills/mcp-builder folder from the GitHub repo composio-community/awesome-claude-plugins into my ~/.claude/skills/composio-community-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/composio-community/awesome-claude-plugins.git && mkdir -p ~/.claude/skills && cp -r awesome-claude-plugins/mcp-builder/skills/mcp-builder ~/.claude/skills/

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

  1. Open a terminal.
  2. Clone the repository: git clone https://github.com/composio-community/awesome-claude-plugins.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r awesome-claude-plugins/mcp-builder/skills/mcp-builder ~/.claude/skills/
  5. Verify it landed: ls ~/.claude/skills/mcp-builder/SKILL.md
  6. Restart Claude Code and ask something like "help me build an MCP server for our API" to trigger it.
  7. Keep internet access available — the skill fetches the latest MCP and SDK docs via WebFetch.
View source on GitHub ↗