mcp-builder

mcp-builder is a skill for Claude Code from This-HW/claude-code-kit. It costs 28 tokens per session (1,069 once invoked), scanned B, original, MIT.

A guide for building and configuring MCP servers. MCP, or Model Context Protocol, is a way to connect an AI assistant to tools, data sources, and predefined prompts.

In plain words
What is it for?
Use it to scaffold servers for tasks such as database queries, file access, external APIs, document resources, or reusable prompts, then connect them to Claude Code.
Why use it?
It provides a starting structure and integration instructions instead of requiring the server setup to be designed from nothing. It covers both new servers and adding tools to existing ones.

Skill for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter; reads .claude/ paths; mentions Claude Code.

Part of the claude-code-kit plugin — 20 skills, 4 hooks shipped together

Good fit Use it to scaffold servers for tasks such as database queries, file access, external APIs, document resources, or reusable prompts, then connect them to Claude Code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/this-hw/claude-code-kit/mcp-builder
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add This-HW/claude-code-kit --skill mcp-builder
Clone the repo
git clone --depth 1 https://github.com/This-HW/claude-code-kit

Made for: Claude Code.

Or install claude-code-kit, the plugin that ships this one along with the rest of its 20 skills, 4 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for mcp-builder

README.md
[![agentmods](https://agentmods.dev/badge/skills/this-hw/claude-code-kit/mcp-builder/github.svg)](https://agentmods.dev/skills/this-hw/claude-code-kit/mcp-builder)
Your own site
<a href="https://agentmods.dev/skills/this-hw/claude-code-kit/mcp-builder"><img src="https://agentmods.dev/badge/skills/this-hw/claude-code-kit/mcp-builder/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for mcp-builder

Your own site · 80×15
<a href="https://agentmods.dev/skills/this-hw/claude-code-kit/mcp-builder"><img src="https://agentmods.dev/badge/skills/this-hw/claude-code-kit/mcp-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,069 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00028 $0.01069
Opus 5.5 $0.00011 $0.00428
Sonnet 5.5 $0.00006 $0.00214
Haiku 4.5 $0.00003 $0.00107

Measured 1mo ago against content hash 6f0ad2bbc22a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

mcp-builder scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

`~/.claude/settings.json`:
plugins/common/skills/mcp-builder/SKILL.md · 236 lines

How it starts

The opening of the file, as written. The whole thing — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCP Server Builder

Model Context Protocol 서버 개발 및 구성

MCP 서버를 생성하고 Claude Code에 통합합니다.


사용법

신규 MCP 서버 생성

/mcp-builder "파일 시스템 접근" filesystem
/mcp-builder "데이터베이스 조회" database-query
/mcp-builder "API 통합" external-api

기존 MCP 서버 설정

/mcp-builder setup postgres
/mcp-builder configure playwright

MCP 서버 유형

1. Tools 서버

외부 도구 및 API 접근:

  • 데이터베이스 쿼리
  • 파일 시스템 조작
  • 외부 API 호출
  • 시스템 명령 실행

2. Resources 서버

정적 리소스 제공:

  • 문서 검색
  • 설정 파일 읽기
  • 템플릿 제공

3. Prompts 서버

사전 정의된 프롬프트:

  • 재사용 가능한 질의
  • 템플릿 프롬프트

개발 워크플로우

1. 프로젝트 초기화

# Python MCP 서버
mkdir mcp-server-myproject
cd mcp-server-myproject
python -m venv venv
source venv/bin/activate
pip install mcp

2. 서버 구조 생성

mcp-server-myproject/
├── src/
│   ├── __init__.py
│   └── server.py           # MCP 서버 구현
├── pyproject.toml          # 의존성
└── README.md               # 사용법

3. Tools 정의

from mcp import Server, Tool

server = Server("myproject-server")

@server.tool()
async def my_tool(arg1: str, arg2: int) -> str:
    """도구 설명"""
    # 구현
    return result

4. 서버 실행

if __name__ == "__main__":
    server.run()

Claude Code 통합

1. MCP 설정 파일 수정

~/.claude/settings.json:

{
  "mcpServers": {
    "myproject": {
      "command": "python",
      "args": ["-m", "mcp_server_myproject"],
      "env": {
        "API_KEY": "your-key"
      }
    }
  }
}

2. 서버 시작

claude mcp list           # MCP 서버 목록 확인
claude mcp --help         # 가용 서브커맨드 확인(버전마다 달라질 수 있음)

템플릿

Python MCP Tools 서버

from mcp import Server
from typing import Any

server = Server("example-server")

@server.tool()
async def example_tool(
    param1: str,
    param2: int = 10
) -> dict[str, Any]:
    """
    Example tool description.

    Args:
        param1: First parameter
        param2: Second parameter (default: 10)

    Returns:
        Result dictionary
    """
    return {
        "result": f"Processed {param1} with {param2}",
        "status": "success"
    }

if __name__ == "__main__":
    server.run()

Read the full file on GitHub · 236 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago Changed 6f0ad2bbc22a
  2. 1mo ago First seen · 236 lines · 28 tokens per session scan B 744272c1c8fa

Subscribe to this mod's changes

mcp-builder is a skill published in the GitHub repository This-HW/claude-code-kit (4 stars, last pushed 1mo ago), licensed MIT. It adds 28 tokens to every session and 1,069 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other skills, from other repositories

code-standards

Prabhdeep (Sonu) Singh's personal coding standards — the house rules and quality bar for how code gets written. INVOKE before writing, generating, refactoring, or reviewing ANY code in ANY language — schemas, endpoints, queries, logging, validation, error handling — even when nobody says "standards" or "style".…

PrabhdeepSingh/claude-plugins · 81 tokens

design-tree

Make design decisions as an explicit branching tree — genuine alternatives, decisive rationale, rejected branches preserved. INVOKE PROACTIVELY when planning or designing any implementation approach, or choosing between architectures, libraries, or data models — especially in plan mode. Skip trivial or forced changes…

PrabhdeepSingh/claude-plugins · 62 tokens

self-review

Surface the riskiest parts of the current diff so a reviewer knows where to look hardest — one inline pass on small diffs, one cold read on a cheaper model tier with in-session synthesis on substantial ones. INVOKE PROACTIVELY whenever a change is finished and about to be handed off, reviewed, or shipped. It points…

PrabhdeepSingh/claude-plugins · 79 tokens

ticket-lifecycle

The ticket-as-control-plane rulebook — the single home for the tracker-operations contract, tracker resolution, the type/priority taxonomy, human-only trigger authorization, derived status, and trust boundaries. INVOKE when reading or writing tickets in a queue-driven flow, resolving a repo's tracker, or deciding…

PrabhdeepSingh/claude-plugins · 105 tokens

tdd

Test-driven development — the red-green-refactor discipline for code that's correct by design, not by accident. INVOKE PROACTIVELY whenever writing or changing code, fixing a bug, adding or structuring tests, or choosing what to mock — even when nobody says "TDD" or "tests". (Tests are code held to…

PrabhdeepSingh/claude-plugins · 80 tokens

pr-conventions

Author PR descriptions from the right per-change-type template (the repo's own PULLREQUESTTEMPLATE wins), embed issue-tracker links, keep the description current as fixes land, and reply to human and bot review threads. INVOKE when opening or updating a PR or responding to reviewer comments — inside /sonu:ship or…

PrabhdeepSingh/claude-plugins · 80 tokens