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Agent skill

Building MCP Servers

by aiskillstore in aiskillstore/marketplace

Guides creation of high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools.

No licenceAuto-check passedAgent Workflows

Install Building MCP Servers

skills CLI
$ npx skills add aiskillstore/marketplace --skill building-mcp-servers -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install aiskillstore/marketplace building-mcp-servers --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/asmayaseen/building-mcp-servers .claude/skills/building-mcp-servers && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
building-mcp-servers
GitHub stars
433
Token cost
~1.4k tokens
SKILL.md length
428 words
Files
12 (incl. scripts, references)
Skills in repo
1,044
Repo updated
First seen
Licence
None found

At a glance

Guides creation of high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools.

  • Works in 4 steps: Deep Research and Planning → Implementation → Review and Test → …
  • Building MCP servers to integrate external APIs
  • SKILL.md covers Overview, High-Level Workflow, Docker/Containerization and Verification, plus 2 more sections
  • Runs Python scripts from its folder; calls npm, npx and python; reaches modelcontextprotocol.io and raw.githubusercontent.com

What it does

Building MCP Servers is an agent skill from aiskillstore/marketplace. Guides creation of 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). Covers tool design, authentication, Docker deployment, and evaluation creation. NOT when consuming existing MCP servers (use the server directly).

Its SKILL.md is about 1.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 13 other files, including scripts and reference files (for example `references/evaluation.md`, `references/mcp_best_practices.md` and `references/node_mcp_server.md`).

It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol, TypeScript, Python and Docker. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.

When your agent uses it

  • Building MCP servers to integrate external APIs
  • Whether in Python (FastMCP)
  • Node/TypeScript (MCP SDK)

Example prompts

  • “Use the building-mcp-servers skill to guide creation of high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external…”
  • “/building-mcp-servers”

Requirements

  • Python 3
  • Node.js
  • Docker

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Deep Research and Planning
  2. Implementation
  3. Review and Test
  4. Create Evaluations

What it can do on your machine

Read from SKILL.md and the folder at commit 44923f3. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 5 files in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • npm
    • npx
    • python
    • python3

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • modelcontextprotocol.io
    • raw.githubusercontent.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Building MCP Servers loads about 1.4k tokens when it runs, and up to ~25k if it reads all its reference files. Until then it costs about 111 tokens; SKILL.md has 428 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~111
When it runs · the whole SKILL.md, loaded when a task matches
~1.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~25k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 428 words (~1,387 tokens).

“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.”

— opening of SKILL.md by aiskillstore
name
building-mcp-servers

Read the full SKILL.md on GitHub

Files

SKILL.md and 11 other files (scripts, references) in skills/asmayaseen/building-mcp-servers of aiskillstore/marketplace.

  • SKILL.md
  • references/evaluation.md
  • references/mcp_best_practices.md
  • references/node_mcp_server.md
  • references/python_mcp_server.md
  • references/taskflow_patterns.md
  • scripts/connections.py
  • scripts/evaluation.py
  • scripts/example_evaluation.xml
  • scripts/requirements.txt
  • scripts/verify.py
  • skill-report.json

Open the folder on GitHubat commit 44923f3

Compare with similar skills

Building MCP Servers next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Building MCP Servers compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Building MCP Servers this skillaiskillstore/marketplace433—~1.4kAutomated safety check: PassNone
MCP Server Builderanthropics/skills180k63 repos~2.3kAutomated safety check: PassApache-2.0
MCP Server BuildershareAI-lab/learn-claude-code78k4 repos~1.2kAutomated safety check: PassMIT
Project Releaseswimmwatch/cloakbrowser-mcp164—~1.9kAutomated safety check: PassMIT
Create MCP Serversglittercowboy/taches-cc-resources2k—~1.5kAutomated safety check: PassMIT
MCP Builderjezweb/claude-skills1.1k—~3.1kAutomated safety check: NotesMIT

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Works with

Categories

Questions about Building MCP Servers

What does Building MCP Servers do?

Guides creation of high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Building MCP Servers is an agent skill from aiskillstore/marketplace. Guides creation of high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools.

When should I use Building MCP Servers?

Building MCP Servers fits situations like: building MCP servers to integrate external APIs; whether in Python (FastMCP); Node/TypeScript (MCP SDK).

How do I install Building MCP Servers in Claude Code?

Run `npx skills add aiskillstore/marketplace --skill building-mcp-servers -a claude-code`. Or copy the skill folder (skills/asmayaseen/building-mcp-servers in aiskillstore/marketplace) into .claude/skills/building-mcp-servers in your project. Claude Code loads it when a task matches its description.

How do I install Building MCP Servers in Codex?

Run `npx skills add aiskillstore/marketplace --skill building-mcp-servers -a codex`. Or copy the skill folder (skills/asmayaseen/building-mcp-servers in aiskillstore/marketplace) into .agents/skills/building-mcp-servers in your project. Codex loads it when a task matches its description.

Can I use Building MCP Servers in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add aiskillstore/marketplace --skill building-mcp-servers -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/building-mcp-servers, .gemini/skills/building-mcp-servers, .github/skills/building-mcp-servers and .opencode/skills/building-mcp-servers in your project.

What does Building MCP Servers need to run?

Going by SKILL.md and its folder, Building MCP Servers needs Python for the scripts in its folder and the command-line tools its instructions call (npm, npx, python and python3). Our summary lists: Python 3; Node.js; Docker.

Does Building MCP Servers access the network?

SKILL.md names 2 domains. In commands or code: modelcontextprotocol.io and raw.githubusercontent.com; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is Building MCP Servers safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Building MCP Servers use?

No licence was found for Building MCP Servers or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Building MCP Servers use?

About 1.4k tokens (SKILL.md is roughly 5.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 24k tokens, read only when the agent opens those files.

What are the alternatives to Building MCP Servers?

Skills that share tags, products or a category with Building MCP Servers: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), Project Release (swimmwatch/cloakbrowser-mcp, 164 stars) and Create MCP Servers (glittercowboy/taches-cc-resources, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Building MCP Servers?

aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 433 GitHub stars. The repository holds 1,044 skills in this directory. The repository was last updated on October 10, 2026.

Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.