mcp-development

mcp-development is a skill for Claude Code, Codex from fabriciofs/mcp-sql-server. It costs 43 tokens per session (623 once invoked), scanned A, a copy of mcp-development, MIT.

A toolkit for building MCP servers, which are programs that provide tools to AI agents through a standard interface. It covers project setup, tool creation, debugging, testing, code review, and documentation.

In plain words
What is it for?
Use it when starting an MCP project, adding tools, diagnosing connection problems, testing a server, reviewing its code, or writing its documentation.
Why use it?
It brings the common setup and development guidance for an MCP server into one set of instructions.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/fabriciofs/mcp-sql-server/mcp-development
Any agent
npx skills add fabriciofs/mcp-sql-server --skill mcp-development
Clone the repo
git clone --depth 1 https://github.com/fabriciofs/mcp-sql-server

Made for: Claude Code, Codex.

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 623 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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 $0.00043 $0.00623
Opus 5 $0.00022 $0.00311
Sonnet 5 $0.00009 $0.00125
Haiku 4.5 $0.00004 $0.00062

Measured 2d ago against content hash 1b9c71ddbbee, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mcp-development scanned grade A with 0 findings 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 2d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to mcp-development — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/mcp-development/SKILL.md · 101 lines

What it actually says

MCP Development Toolkit

Complete toolkit for MCP server development including project setup, tool creation, debugging, and code review.

Project Setup

Directory Structure

mcp-project/
├── src/
│   ├── index.ts          # Server entry point
│   ├── tools/            # Tool definitions
│   │   └── index.ts
│   ├── db/               # Database connections
│   │   └── connection.ts
│   └── utils/
│       └── index.ts
├── build/                # Compiled output
├── .env.example
├── package.json
├── tsconfig.json
└── README.md

package.json

{
  "name": "mcp-server",
  "version": "1.0.0",
  "type": "module",
  "main": "build/index.js",
  "scripts": {
    "build": "tsc",
    "start": "node build/index.js",
    "dev": "tsc --watch",
    "inspector": "npx @modelcontextprotocol/inspector"
  },
  "dependencies": {
    "@modelcontextprotocol/sdk": "^1.0.0",
    "zod": "^3.23.0"
  },
  "devDependencies": {
    "@types/node": "^20.0.0",
    "typescript": "^5.0.0"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "outDir": "build",
    "rootDir": "src",
    "declaration": true,
    "sourceMap": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "build"]
}

For detailed setup guide, see SETUP.md.

Creating Tools

For tool creation templates and patterns, see TOOLS.md.

Debugging

For common issues and debugging techniques, see DEBUG.md.

Code Review

For review checklists, see REVIEW.md.

Quick Commands

# Initialize project
npm init -y && npm install @modelcontextprotocol/sdk zod
npm install -D typescript @types/node && npx tsc --init

# Build and run
npm run build && node build/index.js

# Test with inspector
npx @modelcontextprotocol/inspector
Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 101 lines · 43 tokens per session scan A 1b9c71ddbbee

Subscribe to this mod's changes

mcp-development is a skill published in the GitHub repository fabriciofs/mcp-sql-server (1 stars, last pushed 1mo ago), licensed MIT. It adds 43 tokens to every session and 623 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to mcp-development, differing in 0 lines, and is treated as a copy.

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