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ck:mcp-builder

Create MCP servers for LLM integration with FastMCP and Node/TypeScript SDKs.

Updated Jan 11, 2026
Search Tags:#typescript#python#api development#mcp#server development#llm integration
One-click install
npx skills add https://github.com/felix-howard/ella --skill ck-mcp-builder
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ck:mcp-builder
Source: https://github.com/felix-howard/ella/tree/main/.opencode/skills/mcp-builder
Command: npx skills add https://github.com/felix-howard/ella --skill ck-mcp-builder

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires pypdf, pdfplumber, pdf2image, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill provides a comprehensive guide and framework for developing high-quality Model Context Protocol (MCP) servers, enabling Large Language Models (LLMs) to effectively integrate with external services and APIs.

Core Features & Use Cases

  • Structured Development Process: Guides users through research, implementation, and evaluation phases.
  • Language-Specific Best Practices: Offers detailed guidance for both Python (FastMCP) and Node/TypeScript implementations.
  • Tool Design Principles: Emphasizes building for workflows, optimizing for limited context, and designing actionable error messages.
  • Evaluation Framework: Includes a guide for creating robust evaluations to test LLM interaction with MCP servers.
  • Use Case: A developer needs to create an MCP server that allows an LLM to interact with a company's internal project management API. This Skill provides the step-by-step instructions, code examples, and best practices to build and test such a server.

Quick Start

Follow the Python implementation guide to build an MCP server for a new service.

Frequently Asked Questions about ck:mcp-builder

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build an MCP server for LLM integration with external APIs?▼

To build an MCP server for LLM integration, this Skill guides you through a structured development process covering research, implementation, and evaluation. It provides language-specific best practices for Python (FastMCP) and Node/TypeScript to connect LLMs with external services.

What is the best way to design tools for an MCP server?▼

The best way to design MCP server tools is by building for workflows, optimizing for limited context, and designing actionable error messages. This approach ensures LLMs can effectively interact with external services using agent-centric tool design principles.

Can I use TypeScript and Python for MCP server development?▼

Yes, you can use TypeScript and Python for MCP server development. The Skill offers detailed implementation guidance for both Node/TypeScript using the MCP SDK and Python using the FastMCP framework, adhering to MCP protocol specifications.

How do I evaluate LLM interactions with an MCP server?▼

You can evaluate LLM interactions with an MCP server by following the included evaluation framework. This framework guides you in creating robust tests to verify that LLMs can successfully use the server's tools and resources to interact with external APIs.

Do I need specific frameworks to create a Model Context Protocol server?▼

To create a Model Context Protocol server, you should use either FastMCP for Python or the MCP SDK for Node/TypeScript. These frameworks ensure your server adheres to MCP protocol specifications and best practices for agent-centric tool design.

Why should I optimize MCP tool design for limited context?▼

Optimizing MCP tool design for limited context ensures the LLM can process tool instructions effectively without exceeding token limits. Designing actionable error messages and workflow-oriented tools further enhances the LLM's ability to interact with external services reliably.

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