mcp-builder

Guide MCP server development with TypeScript or Python SDKs.

1|Updated May 5, 2026
One-click install
npx skills add https://github.com/yashs33244/my-mac-claude --skill mcp-builder-yashs33244
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: mcp-builder
Source: https://github.com/yashs33244/my-mac-claude/tree/main/skills/anthropic/mcp-builder
Command: npx skills add https://github.com/yashs33244/my-mac-claude --skill mcp-builder-yashs33244

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

Building an MCP server that other agents can reliably use is hard because tool discovery, naming, schemas, context handling, pagination, and error messages must all work together for successful end-to-end tasks.

Core Features & Use Cases

  • Plan quality MCP tool design: Balance broad API coverage with workflow-oriented tools so agents can complete real tasks efficiently.
  • Implement robust tools with correct schemas: Define clear input/output schemas (Zod or Pydantic) and return structured data when supported by the SDK.
  • Harden reliability with best practices: Use consistent naming conventions, actionable errors, pagination, and transport guidance (stdio vs streamable HTTP).
  • Create evaluations for correctness: Generate stable, read-only evaluation questions to test whether an LLM can use your tools effectively.

Quick Start

Use the mcp-builder skill to create an MCP server that exposes a third-party API as well-named tools with strong schemas and pagination, then verify it by writing an evaluation XML with 10 complex read-only QA pairs.

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 with reliable tool discovery and pagination?

Building an MCP server with reliable pagination involves designing discoverable, workflow-oriented tools and implementing type-safe schemas. This ensures agents can process large datasets efficiently and complete end-to-end tasks without context overload.

What is the best way to define input schemas for Model Context Protocol tools?

The best way to define input schemas for Model Context Protocol tools is using type-safe validation libraries like Zod in TypeScript or Pydantic in Python. This ensures structured data returns and helps agents understand tool parameters accurately.

How do I create evaluations to test if an agent can use my MCP tools correctly?

You create evaluations for MCP tools by generating stable, read-only evaluation questions with verifiable tasks. Writing an evaluation XML with complex read-only QA pairs tests whether an LLM can effectively use your tools for robust performance.

Can I use FastMCP to integrate external services via Model Context Protocol?

Yes, you can use FastMCP with Python to integrate external services via Model Context Protocol. It supports exposing third-party APIs as well-named tools with strong schemas, reliable pagination, and actionable error handling.

When should I use stdio vs streamable HTTP transport for an MCP server?

Choosing between stdio and streamable HTTP transport for an MCP server depends on your deployment context and integration requirements. The skill provides transport guidance to harden reliability and ensure consistent agent communication.

Why does my LLM agent fail to complete tasks when using my MCP tools?

LLM agents fail to complete tasks when MCP tool discovery, naming, schemas, context handling, pagination, and error messages are not properly aligned. Balancing broad API coverage with workflow-oriented tools and actionable errors resolves this.