What is the Model Context Protocol (MCP)?

MCP is an open standard that allows LLMs like Claude to securely interact with external data sources and tools through standardized server implementations.

How does this skill improve tool discoverability?

It enforces consistent naming conventions, clear tool descriptions, and optimized input/output schemas so LLMs can easily identify and use the correct tools for a task.

Which programming languages are supported by this skill?

This skill provides specialized guidance and implementation patterns for both TypeScript (using the Node SDK) and Python (using the FastMCP framework).

Does this skill help with testing and validation?

Yes, it includes a dedicated phase for creating XML-based evaluation suites to test if the LLM can successfully navigate complex tasks using your new server.

MCP Server Builder

Name: MCP Server Builder
Author: anthropics

byanthropics

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24,065

API Development

Builds high-quality Model Context Protocol (MCP) servers to integrate external APIs and services with LLMs.

About

The mcp-builder skill provides a comprehensive framework for developing robust MCP servers in Python or TypeScript, enabling AI models to interact seamlessly with external tools and data. It guides developers through the entire lifecycle of server creation—from initial API research and tool design to implementation, error handling, and the creation of rigorous evaluation suites. By following these industry-standard patterns, you can create discoverable, efficient, and reliable interfaces that empower Claude and other LLMs to perform complex real-world tasks across diverse software ecosystems.

Key Features

Standardized patterns for tool naming, discoverability, and context management
Automated evaluation generation to verify LLM effectiveness with the server
Built-in documentation library for MCP protocol specifications and best practices
Framework for implementing structured outputs, pagination, and actionable errors
Guided implementation for Python (FastMCP) and TypeScript (MCP SDK)
24,065 GitHub stars

Use Cases

Building custom tool integrations for platforms like GitHub, Slack, or internal databases
Standardizing the interface for LLMs to access external services via well-defined protocol tools
Connecting internal proprietary APIs to Claude for automated developer workflows

About

Key Features

Standardized patterns for tool naming, discoverability, and context management
Automated evaluation generation to verify LLM effectiveness with the server
Built-in documentation library for MCP protocol specifications and best practices
Framework for implementing structured outputs, pagination, and actionable errors
Guided implementation for Python (FastMCP) and TypeScript (MCP SDK)
24,065 GitHub stars

Use Cases

Building custom tool integrations for platforms like GitHub, Slack, or internal databases
Standardizing the interface for LLMs to access external services via well-defined protocol tools
Connecting internal proprietary APIs to Claude for automated developer workflows