Why deploy MCP servers on Cloudflare Workers?

Cloudflare Workers provide a low-latency, serverless environment at the edge, which is ideal for the stateless, JSON-RPC 2.0 nature of MCP server implementations.

What is an OpenAI MCP App?

It is a specialized extension for ChatGPT that utilizes the Model Context Protocol to provide the AI with custom tools and interactive UI components rendered in an iframe.

What is the 'text/html+skybridge' MIME type used for?

This is a mandatory MIME type requirement for ChatGPT to correctly render HTML resources as interactive widgets rather than displaying them as plain text.

How does this skill handle CORS issues?

It specifically configures middleware to allow the 'chatgpt.com' origin on MCP routes, preventing the common cross-origin request blocking errors during tool execution.

Does it support the latest MCP standards?

Yes, it includes implementation patterns for MCP SDK 1.25.x, including typesafe request handlers and updated Zod 4 validation schemas.

OpenAI App Builder (MCP)

Name: OpenAI App Builder (MCP)
Author: jezweb

byjezweb

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117

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API 개발

Builds interactive ChatGPT applications and extensions using Model Context Protocol (MCP) servers on Cloudflare Workers.

This skill empowers developers to create feature-rich ChatGPT Apps by leveraging stateless MCP servers hosted on Cloudflare's edge network. It provides a standardized framework for implementing custom tool handlers and interactive HTML/JS widgets while navigating complex requirements like specific MIME types, CORS policies, and asset bindings. It effectively handles the technical bridge between ChatGPT and serverless infrastructure, ensuring production-ready deployments with the latest MCP SDK and Hono routing patterns.

주요 기능

01Interactive UI widget integration using the Skybridge protocol (text/html+skybridge)

02MCP-compliant server architecture for ChatGPT Extensions and Apps

03Automated configuration for Cloudflare Workers, ASSETS bindings, and Hono routing

04117 GitHub stars

05Built-in prevention for common CORS, 404, and SSE heartbeat timeout issues

06Comprehensive support for MCP SDK 1.25.x and Zod 4 migration patterns

사용 사례

01Deploying low-latency, stateless AI integrations using Cloudflare Workers and Hono

02Developing custom ChatGPT tools with interactive data visualizations or UI widgets

03Migrating legacy ChatGPT plugins to the modern Model Context Protocol ecosystem

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jezweb/claude-skills openai-apps-mcp

For use in Claude.ai and ChatGPT

Download Skill