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tanujkumar38
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mcp-builder

Scaffold, test, and package Model Context Protocol servers for multiple AI platforms.

Updated Sep 17, 2026
Search Tags:#scaffolding#claude#mcp#model context protocol#server development#chatgpt#json-rpc
One-click install
npx skills add https://github.com/tanujkumar38/unified-mcp-gateway --skill mcp-builder-tanujkumar38
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mcp-builder
Source: https://github.com/tanujkumar38/unified-mcp-gateway/tree/main/.agents/skills/mcp-builder
Command: npx skills add https://github.com/tanujkumar38/unified-mcp-gateway --skill mcp-builder-tanujkumar38

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve? Building a Model Context Protocol (MCP) server that works across Claude Desktop, ChatGPT, Cursor, and other AI hosts requires navigating platform-specific transport rules, JSON-RPC handshake requirements, and context window limits, which this Skill codifies into a repeatable engineering workflow. ## Core Features & Use Cases - Automated Scaffolding: Generate complete MCP server projects via scripts/mcp_scaffold.py with archetypes for universal dual-transport servers, multi-server gateways, TypeScript stdio/HTTP, Python FastMCP, private-API portals, and Puppeteer browser automation. - Protocol Verification: Run scripts/verify_mcp_server.py to test the initialize handshake, ping, tool discovery, and detect stdout pollution that corrupts stdio JSON-RPC streams. - Platform Compatibility Guidance: Reference playbooks cover ChatGPT's HTTPS-only and tools-only constraints, readOnlyHint requirements, search/fetch connector tools, and the 4-tool Meta-Tool gateway pattern that cuts context usage by roughly 97%. - Use Case: Connect an internal enterprise portal with no public API to Claude Desktop by scaffolding a private-api server, implementing session re-authentication, verifying the protocol handshake, and registering the host configuration. ## Quick Start Ask the agent to scaffold a universal MCP server for your target service and verify it with the protocol tester.

Frequently Asked Questions about mcp-builder

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build an MCP server for Claude Desktop?▼

Scaffold a TypeScript stdio server with mcp_scaffold.py using --type ts-stdio, then run npm install and npm run build. Register it in claude_desktop_config.json with an absolute path to build/index.js and any required environment variables.

How to connect an MCP server to ChatGPT?▼

ChatGPT only supports remote HTTPS SSE transports, never local stdio. Run the server in HTTP mode, expose it through ngrok or Cloudflare Tunnel, and register the public /sse URL in ChatGPT Developer Mode.

Why does my MCP server fail with JSON parsing errors?▼

The most common cause is stdout pollution: any console.log or print writing to stdout corrupts the JSON-RPC stream in stdio mode. Route all diagnostic logging to stderr and verify with the MCP Inspector or a raw pipe handshake test.

Does ChatGPT support MCP resources and prompts?▼

No, ChatGPT implements a tools-only subset of MCP and ignores resources, prompts, roots, and sampling. Wrap each resource and prompt as a callable fallback tool, and set readOnlyHint: true on read tools to avoid manual approval prompts.

How do I reduce context window usage with many MCP tools?▼

Use the Meta-Tool gateway pattern, which exposes only four tools (list_plugins, search_tools, get_tool_schema, call_tool) instead of loading every schema. This reduces context consumption from tens of thousands of tokens to roughly 1,200.

How can I build an MCP server for a website without an API?▼

Choose between three archetypes: web scraping with Axios and Cheerio for public read-only content, Puppeteer browser automation for JavaScript-heavy interactive sites, or private-API reverse engineering of internal XHR endpoints for authenticated portals.

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