Mcp Builder

MCP Tools

Bootstraps new Model Context Protocol (MCP) servers from a natural language description. Use when the user asks to build an MCP server, create an MCP tool, scaffold an MCP integration, or add MCP capabilities to an existing project. NOT for: general API design, non-MCP tool building, or frontend tasks.

Install

openclaw skills install agentic-atlas-mcp-builder

MCP Builder Skill

Bootstraps new Model Context Protocol servers from natural language descriptions.

Instructions

When the user requests an MCP server or tool:

Identify the core functionality from the description
Determine the appropriate transport (stdio for CLI, SSE for web)
Scaffold a TypeScript or Python MCP server using the official SDK
Generate tool definitions from API schemas or describe them manually
Include a test harness with example invocations
Provide configuration for Claude Code, Cursor, and OpenCode

Features

TypeScript (recommended) and Python scaffolding
Auto-generates tool definitions from API schemas (OpenAPI, JSON Schema)
STDIO and SSE transport support
Built-in error handling and validation
Test harness with mock LLM calls
Claude Code / Cursor / OpenCode configuration snippets

Architecture

mcp-server/
├── src/
│   ├── index.ts          # Server entry point
│   ├── tools.ts          # Tool definitions
│   └── handlers.ts       # Request handlers
├── package.json
├── tsconfig.json
├── README.md
└── test/
    └── harness.ts        # Test harness

Output Format

Project scaffold (all files)
Tool definitions with descriptions and input schemas
Configuration snippet for Claude Code's mcpServers config
Test invocation example

Example

User: "Build an MCP server for our internal issue tracker with create, list, and close operations"

→ Generate: TypeScript MCP server with 3 tools, JSON Schema for each, test harness, Claude Code config

Dependencies

Requires: Node.js 18+, TypeScript, @modelcontextprotocol/sdk