MCP Builder
A guide for building high-quality MCP servers in Python (FastMCP) or Node/TypeScript (MCP SDK).
About MCP Builder
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). Published by Anthropic in the anthropics/skills repository as an Agent Skills package (a folder with a SKILL.md file). Details were read from SKILL.md and the repository README; nothing was installed or executed.
What you can do
- MCP server design guidance
- Python FastMCP servers
- Node and TypeScript MCP SDK servers
- Tool design for external APIs
Skill package
- Format
- Agent Skills (a folder with SKILL.md)
- Works with
- Claude Code, Claude.ai, Claude API
- Pre-approved tools
- None declared
- License
- Complete terms in LICENSE.txt
How to install
From the publisher
Claude Code: run /plugin marketplace add anthropics/skills, then /plugin install example-skills@anthropic-agent-skills. Or copy the skills/mcp-builder folder into .claude/skills/ in your project. Claude.ai and the Claude API: upload the skill folder as a custom skill (see the repository README for links).
How do I install MCP Builder?
The publisher’s install steps are shown above. A skill is a folder with a SKILL.md file. Copy that folder into your agent’s skills directory and the agent loads it when a task matches the skill’s description: Claude Code reads .claude/skills/ in the project and ~/.claude/skills/; other agents that support the Agent Skills format document their own location. The file itself is at github.com/anthropics/skills/blob/main/skills/mcp-builder/SKILL.md.
Which agents can use MCP Builder?
The publisher lists Claude Code, Claude.ai, Claude API.
Is it free?
Free to use, according to the published details.
Questions and answers
What is MCP Builder?
MCP Builder is a skill in the Developer tools category. A guide for building high-quality MCP servers in Python (FastMCP) or Node/TypeScript (MCP SDK).
How do I install MCP Builder?
A skill is a folder with a SKILL.md file. Copy that folder into your agent's skills directory (for Claude Code, .claude/skills/ in the project or ~/.claude/skills/) and the agent loads it when a task matches the skill's description. The file is at https://github.com/anthropics/skills/blob/main/skills/mcp-builder/SKILL.md. The publisher's steps: Claude Code: run /plugin marketplace add anthropics/skills, then /plugin install example-skills@anthropic-agent-skills. Or copy the skills/mcp-builder folder into .claude/skills/ in your project. Claude.ai and the Claude API: upload the skill folder as a custom skill (see the repository README for links).
Is MCP Builder free?
Free to use, according to the published details.
What can MCP Builder do?
According to the published details: MCP server design guidance; Python FastMCP servers; Node and TypeScript MCP SDK servers; Tool design for external APIs.
Which agents or platforms work with MCP Builder?
The publisher lists Claude Code, Claude.ai, Claude API.
Where is MCP Builder published?
Its homepage is https://github.com/anthropics/skills/tree/main/skills/mcp-builder and its source repository is https://github.com/anthropics/skills. RUAGENTIC read these details from Publisher repository on October 1, 2026 and did not install or run the project.
Sources and checks
View the sourceSource information collected October 1, 2026.
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