mcp-builder

Build MCP servers for TypeScript and Python with protocol compliance and evaluation.

9|1|Updated May 13, 2026
One-click install
npx skills add https://github.com/susomejias/rembric --skill mcp-builder-susomejias
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: mcp-builder
Source: https://github.com/susomejias/rembric/tree/main/.agents/skills/mcp-builder
Command: npx skills add https://github.com/susomejias/rembric --skill mcp-builder-susomejias

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires mcp, anthropic, and includes scripts (resource) and references (resource) components.

What problem does it solve?

Building MCP servers that enable LLMs to interact with external services requires deep knowledge of protocol specifications, SDK patterns, and evaluation methodologies. This Skill eliminates the guesswork by providing comprehensive guides, reference materials, and evaluation frameworks.

Core Features & Use Cases

  • Complete Implementation Guides: Step-by-step instructions for both TypeScript and Python MCP servers, covering project structure, tool registration, input validation, and error handling.
  • Best Practices Documentation: Universal guidelines for naming conventions, response formats, pagination, transport selection, and security.
  • Evaluation Framework: Tools and methodologies for testing MCP server effectiveness through comprehensive QA pair generation and automated evaluation harnesses.

Quick Start

Use the mcp-builder skill to create a new MCP server for your target API by following the four-phase workflow outlined in the guide.

Frequently Asked Questions about mcp-builder

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build an MCP server for an external API?

To build an MCP server, follow a structured four-phase workflow covering research, planning, implementation, and evaluation. It provides complete guides for both TypeScript and Python, detailing project structure, tool registration, input validation, and error handling.

What is the best way to test MCP server responses?

Testing MCP server responses requires an evaluation framework utilizing comprehensive QA pair generation and automated evaluation harnesses. This methodology measures server effectiveness and ensures protocol compliance and proper SDK usage during interactions.

Can I use Python to develop an MCP server, or is TypeScript required?

You can use either Python or TypeScript to develop an MCP server. The skill provides complete implementation guides, SDK patterns, and best practices documentation tailored for both technology stacks to ensure production-ready quality.

What protocols and SDK patterns do I need to follow for MCP server development?

MCP server development requires compliance with specific protocol specifications and SDK patterns. Universal guidelines cover naming conventions, response formats, pagination, transport selection, and security to ensure proper external API integration.

How does an MCP server allow an LLM to interact with external services?

An MCP server allows LLMs to interact with external services by acting as a compliant intermediary layer. It registers tools, handles input validation, manages error handling, and structures responses so the LLM can successfully query and manipulate external APIs.

Why do I need an evaluation harness for my MCP server?

An evaluation harness is needed to validate that your MCP server handles real-world LLM interactions correctly. By generating QA pairs and automating evaluations, it eliminates guesswork and verifies that tool registration, response formats, and error handling function as intended.