mcp-builder

Guide MCP server development in Python and TypeScript with best practices.

Updated Mar 14, 2026

Search Tags:#api development #mcp #tool design #llm integration #typescript sdk #python fastmcp

Ready to run

npx skills add https://github.com/marcusfelix/barney --skill mcp-builder-marcusfelix

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: mcp-builder
Source: https://github.com/marcusfelix/barney/tree/main/src/prompts/skills/mcp-builder
Command: npx skills add https://github.com/marcusfelix/barney --skill mcp-builder-marcusfelix

SYSTEM DOCUMENTATION & REQUIREMENTS

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

What problem does it solve?

This Skill provides a comprehensive guide and best practices for developing robust Model Context Protocol (MCP) servers, enabling Large Language Models (LLMs) to reliably interact with external services and APIs.

Core Features & Use Cases

MCP Server Development: Learn the end-to-end process of creating MCP servers in Python or TypeScript.
Tool Design & Implementation: Understand how to define effective tools with clear schemas, descriptions, and annotations.
Testing & Evaluation: Implement rigorous testing strategies and create evaluations to measure LLM effectiveness.
Use Case: You need to build an MCP server that allows an LLM to manage GitHub repositories by creating issues, listing branches, and fetching commit history. This Skill guides you through the entire process from setup to evaluation.

Quick Start

Use the mcp-builder skill to get started building an MCP server in TypeScript.

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 LLM integration?▼

To build an MCP server for LLM integration, you define effective tools with clear schemas and implement the server using the Python FastMCP framework or the Node/TypeScript MCP SDK, following best practices for naming conventions and transport mechanisms.

What is the best way to design tools for a Model Context Protocol server?▼

The best way to design tools for a Model Context Protocol server is to define them with clear schemas, descriptions, and annotations, ensuring reliable interaction between LLMs and external APIs through proper response formatting and pagination.

Can I use Python FastMCP to create an MCP server instead of TypeScript?▼

Yes, you can use Python FastMCP to create an MCP server as an alternative to the Node/TypeScript MCP SDK, with both paths supporting comprehensive evaluation strategies, security configurations, and advanced features like resource registration.

How does MCP server transport work with streamable HTTP and stdio?▼

MCP server transport mechanisms like streamable HTTP and stdio facilitate communication between the server and LLM clients, allowing you to choose the appropriate channel for passing context and external service data securely.

How do I evaluate and test LLM effectiveness when using an MCP server?▼

You evaluate LLM effectiveness with an MCP server by implementing rigorous testing strategies and creating specific evaluations that measure how well the LLM interacts with your defined tools and external services.

What are the limitations or security considerations when developing an MCP server?▼

When developing an MCP server, key security considerations involve properly configuring transport mechanisms, managing context injection safely, and ensuring robust tool design to prevent unauthorized external API interactions.