mcp-builderPurpose, usage and source

What this Skill does

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

How the upstream workflow works

<evaluation>
  <qa_pair>
    <question>Find discussions about AI model launches with animal codenames. One model needed a specific safety designation that uses the format ASL-X. What number X was being determined for the model named after a spotted wild cat?</question>
    <answer>3</answer>
  </qa_pair>
<!-- More qa_pairs... -->
</evaluation>

Requirements and setup

Limits and quality checks

Start with a safe trial

1. Check the supported host and the repository installation instructions. Keep the Skill directory and its referenced scripts, assets and documentation together; SKILL.md alone may omit dependencies.
2. Give the agent your real input, desired output and acceptance criteria. Invocation syntax and available tools depend on the host; this site does not assume a universal install command.
3. Try the source workflow in a disposable project or on a copy. Review operations that change files, remote services or billable resources before allowing them.
4. Validate the output against the source quality checks and your own requirements. A successful trigger or a high repository Star count does not establish a correct result.

Skill format and directory specification ↗

Read further in the source

• Overview
• 🚀 High-Level Workflow
• 1.1 Understand Modern MCP Design
• 1.2 Study MCP Protocol Documentation
• 1.3 Study Framework Documentation
• 1.4 Plan Your Implementation
• 2.1 Set Up Project Structure
• 2.2 Implement Core Infrastructure
• 2.3 Implement Tools
• 3.1 Code Quality
• 3.2 Build and Test
• Phase 4: Create Evaluations
• 4.1 Understand Evaluation Purpose
• 4.2 Create 10 Evaluation Questions
• 4.3 Evaluation Requirements
• 4.4 Output Format
• 📚 Documentation Library
• Core MCP Documentation (Load First)
• SDK Documentation (Load During Phase 1/2)
• Language-Specific Implementation Guides (Load During Phase 2)
• Evaluation Guide (Load During Phase 4)

Related Skills

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Translation and scope

This reading guide selects passages from the pinned upstream SKILL.md. Translation is assisted. It is not a complete manual or a claim of tested compatibility. Read the original and its referenced files before use.

This introduction refers to the pinned version below; current repository activity and collection time are shown separately.

Pinned source

Read the original ↗

Source retrieved

2026-10-29T09:32:23Z

Source commit

ca45fc496a3436251f191354091d557da31c15b5

Source SHA-256

b483b56d6673134497e45489c317f26ae0f1429c194db0297e43073e17e6748c