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Build Chatgpt App Skill for Codex

by openai

Use when the user explicitly wants a ChatGPT App, Apps SDK project, MCP server plus widget UI, ChatGPT-compatible tool UI, or submission/deployment work for that surface. Build, scaffold, refactor, or troubleshoot those projects from Cursor, consult openai-docs before generating code, and use openai-platform-api-key before any app path that requires live OpenAI API credentials.

433 tokens
context cost
the whole folder, loaded on every use
1
files
instructions only
0
copies elsewhere
how many repositories repackaged it
2
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/openai/openai-developers-for-cursor --skill build-chatgpt-app

The instruction itself

4 sections, as written by the author

Build ChatGPT App

Use this skill for Apps SDK projects that combine an MCP server with a ChatGPT-facing tool or widget experience.

Before You Build

  • Use openai-docs first for current Apps SDK guidance.
  • If the requested app or verification flow calls the OpenAI API, use openai-platform-api-key before API-backed implementation, execution, or smoke tests.
  • Inspect the target repo before choosing architecture.

Workflow

  • Classify the app:
  • tool-only
  • widget-backed
  • submission-ready
  • Plan the tool surface before code:
  • tool names
  • input schemas
  • read/write behavior
  • annotations and expected outputs
  • Choose the smallest repo shape that fits the request.
  • Register the MCP server surface and widget resources deliberately.
  • Keep structured data, UI metadata, and side effects clear and reviewable.
  • Add local run instructions and basic verification steps when implementation is requested.

Rules

  • Prefer current OpenAI Apps SDK docs over stale examples.
  • Keep tool annotations and widget metadata aligned with actual behavior.
  • Treat CSP, domains, and submission-readiness as explicit design inputs when the app is meant for review or launch.
  • Use chatgpt-app-submission when the user needs submission-specific review preparation.

How to use it

Copy the folder

Take openai/openai-developers-for-cursor-build-chatgpt-app from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.