mcp-builder

Build MCP servers in Python or TypeScript with validated tools.

Updated May 4, 2026
One-click install
npx skills add https://github.com/hitoshiseki/jutsu-simulator --skill mcp-builder-hitoshiseki
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: mcp-builder
Source: https://github.com/hitoshiseki/jutsu-simulator/tree/main/.claude/skills/mcp-builder
Command: npx skills add https://github.com/hitoshiseki/jutsu-simulator --skill mcp-builder-hitoshiseki

SYSTEM DOCUMENTATION & REQUIREMENTS

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

What problem does it solve?

This Skill solves the difficulty of building Model Context Protocol (MCP) servers that enable LLMs to effectively interact with external APIs and services. Without proper design patterns, MCP servers often expose raw endpoints that are poorly suited for agent workflows, resulting in inefficient context usage and failed task completion.

Core Features & Use Cases

  • Agent-Centric Design Principles: Learn to build workflow-oriented tools optimized for limited LLM context windows, with actionable error messages and natural task subdivisions.
  • Language-Specific Implementation Guides: Complete guides for Python (FastMCP with Pydantic) and Node/TypeScript (MCP SDK with Zod), covering project structure, tool registration, and async patterns.
  • Evaluation Framework: Create comprehensive test suites to verify that LLMs can effectively use your MCP server to answer complex, realistic questions.

Quick Start

Use the mcp-builder skill to create a high-quality MCP server for your target API by following the four-phase workflow: research and plan, implement tools in Python or TypeScript, review code quality, and generate evaluation questions.

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 that connects LLMs to external APIs?

Build an MCP server by following a workflow-oriented design that optimizes limited LLM context windows, uses actionable error messages, and subdivides tasks naturally. This approach ensures efficient LLM interaction with external services.

What is the best way to design Model Context Protocol tools for agent workflows?

Design Model Context Protocol tools by creating workflow-oriented interfaces instead of raw endpoints, providing natural task subdivisions and actionable error messages optimized for limited LLM context windows to ensure successful task completion.

Can I use FastMCP and Pydantic to implement an MCP server in Python?

Yes, you can use FastMCP with Pydantic to implement an MCP server in Python, covering project structure, tool registration, and async patterns. Complete language-specific implementation guides are provided for this stack.

Does the MCP SDK support TypeScript and Zod for server development?

Yes, the MCP SDK supports Node and TypeScript using Zod for input validation. Complete guides cover project structure, tool registration, async patterns, and error handling for server development in this environment.

How do I create an evaluation framework to test if LLMs can use my MCP server?

Create an evaluation framework by generating comprehensive test suites that verify LLMs can effectively use your MCP server to answer complex, realistic questions. This is the final phase of the server building workflow.

Why do raw API endpoints fail when exposed directly through an MCP server?

Raw API endpoints are poorly suited for agent workflows because they result in inefficient context usage and failed task completion. Workflow-oriented tool design with proper input validation is required for effective LLM interaction.