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mcp-builder

Create MCP servers in Python, TypeScript, or C# with explicit schemas.

Updated Apr 12, 2026
Search Tags:#typescript#python#evaluation#mcp#fastmcp#model-context-protocol#mcp-server
One-click install
npx skills add https://github.com/davidrrowley/CortexYouV3 --skill mcp-builder-davidrrowley
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mcp-builder
Source: https://github.com/davidrrowley/CortexYouV3/tree/main/.agents/skills/mcp-builder
Command: npx skills add https://github.com/davidrrowley/CortexYouV3 --skill mcp-builder-davidrrowley

SYSTEM DOCUMENTATION & REQUIREMENTS

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

What problem does it solve?

Guides engineers to design, implement, test, and evaluate MCP (Model Context Protocol) servers so LLMs can reliably interact with external services and APIs through well-structured tools.

Core Features & Use Cases

  • Cross-language guidance: Patterns and examples for Python (FastMCP), Node/TypeScript (MCP SDK), and C#/.NET (Microsoft MCP).
  • Production readiness: Transport selection (stdio vs streamable HTTP), authentication patterns, input validation (Pydantic/Zod), pagination, async patterns, and error handling best practices.
  • Evaluation & governance: Built-in evaluation guidance, test harness, and acceptance criteria to verify LLM usability and safety for integrations with Azure, Foundry, or third-party SaaS.

Quick Start

Create an MCP server that registers a read-only "search_documents" tool (with input schema and clear description) using either the TypeScript or Python example and run the provided evaluation harness.

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 to let LLMs interact with external APIs?▼

Build MCP servers using Python (FastMCP), Node/TypeScript (MCP SDK), or C#/.NET to expose structured tools that let LLMs interact with external APIs and services. The Skill provides patterns for local stdio or streamable HTTP deployments.

Can I use Python and TypeScript to create Model Context Protocol servers?▼

Yes, you can create Model Context Protocol servers using Python with FastMCP or Node with the TypeScript MCP SDK, applying explicit input validation schemas like Pydantic or Zod for reliable LLM interactions.

What's the best way to validate inputs and handle errors in MCP servers?▼

Validate inputs in MCP servers using Pydantic for Python or Zod for TypeScript, and handle errors with actionable messages. The Skill ensures production readiness by enforcing explicit schemas, async patterns, and clear tool annotations.

How do I evaluate and test MCP servers for LLM usability?▼

Evaluate MCP servers for LLM usability using the built-in evaluation harness and test guidance. This verifies safety and reliability for integrations with Azure, Foundry, or third-party SaaS platforms through defined acceptance criteria.

Does the MCP SDK support streamable HTTP and stdio transport?▼

Yes, the MCP SDK supports both local stdio and streamable HTTP transports. The Skill helps you select the appropriate transport method and implement authentication patterns for your specific deployment context.

When should I add pagination and async patterns to my MCP server?▼

Add pagination and async IO patterns to MCP servers when handling large external API responses or non-blocking operations. The Skill enforces these production-ready practices to ensure reliable LLM interactions and evaluation harness compatibility.

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