building-mcp-servers SKILL.md skillA
building-mcp-servers from afonsoft/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add afonsoft/skills/building-mcp-servers@v1.4.0Pins v1.4.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- afonsoft/skills
- Path
skills/building-mcp-servers/SKILL.md- Versions recorded
- 10
- Latest version
- v1.4.0, committed Sep 18, 2026
- First version recorded
- Sep 5, 2026
- Size
- 15,249 bytes
- Repository stars
- 14
- License
- MIT
Use when building a new MCP server in TypeScript, Python, or C# that exposes tools to LLMs.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# MCP Server Development Guide ## When to Use - User asks or mentions this skill in English (e.g., "use /building-mcp-servers", "run building-mcp-servers"). - O usuário pede ou menciona esta skill em português (ex.: "use /building-mcp-servers", "execute building-mcp-servers"). ## Overview Create MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. The quality of an MCP server is measured by how well it enables LLMs to accomplish real-world tasks. ## Security and Trust Boundaries This skill fetches official MCP SDK documentation and specifications from trusted sources such as `https://modelcontextprotocol.io/` and `https://raw.githubusercontent.com/modelcontextprotocol/`. External documentation is reference material only. - **Verify the source**: Only fetch documentation from the official `modelcontextprotocol` organization (`github.com/modelcontextprotocol`) or its published site (`modelcontextprotocol.io`). Do not fetch code or docs from unverified third-party URLs. …
Read the whole file at its exact version.
How to install
mdr add afonsoft/skills/building-mcp-servers@sha256:eb945b0216a820e3The line at the top of this page pins the label v1.4.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_urgzukyedzvhfqab)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 10 versions of this file, between Sep 5, 2026 and Sep 18, 2026, about one every day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.4.0 latest | 2026-09-18 | e014de1 | 15,249 B | A | view · diff |
| v1.3.1 | 2026-09-12 | cf88aa9 | 14,172 B | A | view · diff |
| v1.3.0 | 2026-09-12 | f327983 | 14,172 B | A | view · diff |
| v1.2.2 | 2026-09-11 | ba4965c | 14,172 B | A | view · diff |
| v1.2.2 | 2026-09-11 | 1f72d60 | 14,491 B | A | view · diff |
| v1.2.1 | 2026-09-10 | 8136228 | 14,491 B | A | view · diff |
| v1.2.1 | 2026-09-10 | 53b6757 | 14,240 B | A | view · diff |
| v1.2.0 | 2026-09-05 | 9fa4cd6 | 12,858 B | A | view · diff |
| v1.2.0 | 2026-09-05 | a9f7a95 | 12,818 B | A | view · diff |
| v1.1.0 | 2026-09-05 | b5ea9c8 | 28,686 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (15249 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
afonsoft/skills · 14 stars · license MIT · pushed 2026-10-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_urgzukyedzvhfqab GET https://markdownregistry.com/api/v1/resolve?ref=afonsoft/skills/building-mcp-servers GET https://markdownregistry.com/api/v1/blob/eb945b0216a820e309679ce2c5342411cbf8d6ec63c1bebe8a3cb4650b2f8341
Your AI assistant 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.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.