# Mcp Server Builder

> Meta-skill for extending agent capabilities. Scaffolding new Model Context Protocol servers to connect to private APIs.

- Skill: `mayurrathi/mcp-server-builder` (Agent Skill)
- Install (CLI): `npx skillmds@latest add mayurrathi/mcp-server-builder`
- Raw SKILL.md: https://api.skillmd.com/api/skills/mayurrathi/mcp-server-builder/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: mayurrathi (https://skillmd.com/u/mayurrathi)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/mayurrathi/mcp-server-builder

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# 3.2.1 Mcp Server Builder

Use this skill when tasked with extending the agent's capabilities by building a new Model Context Protocol (MCP) server.

## 1. Project Scaffolding
- **Initialization:** Scaffold standard Node.js or Python projects configured for MCP.
- **Dependencies:** Install the official `@modelcontextprotocol/sdk` or the Python equivalent.

## 2. Server Architecture
- **Tool Definitions:** Define strict JSON schema definitions for all resources and tools the MCP server exposes.
- **Protocol Handlers:** Map incoming JSON-RPC calls from the MCP client to the private API endpoints.

## 3. Security & Context
- **API Keys:** Never hardcode private API keys in the MCP server. Read them cleanly from the local environment or `.env`.
- **Error Handling:** Return descriptive error contexts back over the MCP protocol so the agent can self-correct when API calls fail.