Mcp Builder

This is a comprehensive guide for building Model Context Protocol servers that let LLMs interact with external APIs and services. It walks you through the full process: researching MCP design patterns, choosing between TypeScript and Python implementations, building tools with proper schemas and error handling, and creating evaluations to test if your server actually works. The guide emphasizes practical decisions like favoring comprehensive API coverage over workflow shortcuts, using streamable HTTP for remote servers, and writing actionable error messages. What stands out is the evaluation framework at the end, which pushes you to create 10 realistic test questions to verify your MCP server enables LLMs to solve real problems, not just call functions correctly.

skills.sh installs: 395
GitHub stars: 33.2K
last updated: Aug 21, 2026

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Install

$ npx -y skills add davila7/claude-code-templates --skill mcp-builder --agent claude-code

Installs into .claude/skills of the current project.

Files

MCP Server Development Guide

Overview

Create MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. The quality of an MCP server is measured by how well it enables LLMs to accomplish real-world tasks.

Process

🚀 High-Level Workflow

Creating a high-quality MCP server involves four main phases:

Phase 1: Deep Research and Planning

1.1 Understand Modern MCP Design

API Coverage vs. Workflow Tools: Balance comprehensive API endpoint coverage with specialized workflow tools. Workflow tools can be more convenient for specific tasks, while comprehensive coverage gives agents flexibility to compose operations. Performance varies by client—some clients benefit from code execution that combines basic tools, while others work better with higher-level workflows. When uncertain, prioritize comprehensive API coverage.

Tool Naming and Discoverability: Clear, descriptive tool names help agents find the right tools quickly. Use consistent prefixes (e.g., github_create_issue, github_list_repos) and action-oriented naming.

SKILL.md on GitHub