mcp-builder is agent-read markdown (skill) from akillness/jeo-skills: Build production MCP (Model Context Protocol) servers that let LLMs drive an external API through well-designed tools, in TypeScript (MCP SDK) or Python (FastMCP). Route one request to research and planning, tool design, transport choice, implementation, security review, or evaluation. Use when the user wants to wrap an API as MCP tools, name and shape those tools, choose between stdio and streamable HTTP, decide tools vs resources vs prompts, write a Server Card and publish to the MCP registry,.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# MCP Server Builder
Build an MCP server whose quality is measured by one thing: **can an LLM
actually accomplish real tasks with it?** Not endpoint coverage, not schema
elegance. A server that mirrors 40 REST endpoints and leaves the model unable to
complete a workflow has failed.
The most common failure is treating this as an API-wrapping exercise. Tool
naming, response shape, error text, and pagination are all *agent ergonomics*
problems, and they decide whether the server works.
Bundled from `anthropics/skills` commit
`3b3fad96af16a10759d930941b4520ba0c40edae` (2026-08-21), Apache-2.0. Upstream
ships `skills/mcp-builder/LICENSE.txt`; the repository root carries no SPDX
license, so the per-skill license is the operative one — see
[upstream and licensing](references/upstream-and-licensing.md).
## When to use this skill
- Wrap an external API or service as an MCP server.
- Decide tool granularity: comprehensive endpoint coverage versus workflow tools.
- Name and shape tools so an agent picks the right one unprompted.
- Choose a transport and a state model.
- Diagnose a server whose tools the model misuses or cannot chain.
…
Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
GET https://markdownregistry.com/api/v1/artifacts/art_pgcipik6lipnpqrm
GET https://markdownregistry.com/api/v1/resolve?ref=akillness/jeo-skills/mcp-builder
GET https://markdownregistry.com/api/v1/blob/dd3be44e49e65300ccf5fdcffde59ead69037408efc2292d6f5da83b3366e9e8
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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