# ChatGPT App Builder

Build ChatGPT widget apps with mcp-use; superseded by mcp-app-builder.

- Repository: https://github.com/Shubhamsaboo/awesome-llm-apps (143670 stars)
- Category: AI and agents
- License: Apache-2.0
- Last updated: 2026-10-22
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add Shubhamsaboo/awesome-llm-apps --skill chatgpt-app-builder -g -a claude-code -y`
Codex: `npx skills add Shubhamsaboo/awesome-llm-apps --skill chatgpt-app-builder -g -a codex -y`
Cursor: `npx skills add Shubhamsaboo/awesome-llm-apps --skill chatgpt-app-builder -g -a cursor -y`
Gemini CLI: `npx skills add Shubhamsaboo/awesome-llm-apps --skill chatgpt-app-builder -g -a gemini-cli -y`

## Description

DEPRECATED: This skill has been replaced by `mcp-app-builder`. Check if `mcp-app-builder` is available in the skills folder. If not, install it: `npx skills install mcp-use/mcp-use --skill mcp-app-builder` Use `mcp-app-builder` instead of this skill. Build ChatGPT apps with interactive widgets using mcp-use and OpenAI Apps SDK. Use when creating ChatGPT apps, building MCP servers with widgets, defining React widgets, working with Apps SDK, or when user mentions ChatGPT widgets, mcp-use widgets, or Apps SDK development.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# ChatGPT App Builder

Build ChatGPT apps with interactive widgets using mcp-use. Zero-config widget development with automatic registration and built-in React hooks.

The app is consumed by **two users at once**: the **human** and the **ChatGPT LLM**. They collaborate through the widget -- the human interacts with it, the LLM sees its state. The widget is your shared surface.

## Before You Code

- **Clarify what to build** → [discover.md](references/discover.md): when starting a new app, validating an idea, or scoping features
- **Design tools and widgets** → [architecture.md](references/architecture.md): when deciding what needs UI vs tools-only, designing UX flows

## Setup

- **Scaffold and run** → [setup.md](references/setup.md): when creating a new project, starting dev server, connecting to ChatGPT/Claude

## Implementation

- **Server handlers + widget creation** → [server-and-widgets.md](references/server-and-widgets.md): when writing server.tool() with widgets, widget() helper, React widget files
- **Widget state and LLM context** → [state-and-context.md](references/state-and-context.md): when persisting state, triggering LLM from widget, managing ephemeral vs persistent data
- **Display modes, theme, layout** → [ui-guidelines.md](references/ui-guidelines.md): when adapting to inline/fullscreen/PiP, handling theme, device, locale
- **Component API** → [components-api.md](references/components-api.md): when using McpUseProvider, Image, ErrorBoundary, useWidget
- **CSP and metadata** → [csp-and-metadata.md](references/csp-and-metadata.md): when configuring external domains, dual-protocol metadata
- **Advanced patterns** → [widget-patterns.md](references/widget-patterns.md): when building complex widgets with tool calls, state, theming

## Quick Reference

The rest: https://github.com/Shubhamsaboo/awesome-llm-apps/blob/HEAD/generative_ui_agents/ai-mcp-app-builder/apps/mcp-use-server/.agent/skills/chatgpt-app-builder/SKILL.md