OpenAI Developers for Claude Code is a Claude Code plugin bundle that connects OpenAI developer documentation and workflow guidance to Claude Code. It helps users build AI applications, agents, and ChatGPT Apps from Claude Code, including setup, troubleshooting, Agents SDK development, and app submission. The catalogue entries are the plugin's skills, plugin metadata, and documentation MCP integration.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add openai/openai-developers-for-claude --skill build-chatgpt-appgit clone --depth 1 https://github.com/openai/openai-developers-for-claudeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/openai/openai-developers-for-claude/build-chatgpt-app)<a href="https://agentmods.dev/skills/openai/openai-developers-for-claude/build-chatgpt-app"><img src="https://agentmods.dev/badge/skills/openai/openai-developers-for-claude/build-chatgpt-app/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/openai/openai-developers-for-claude/build-chatgpt-app"><img src="https://agentmods.dev/badge/skills/openai/openai-developers-for-claude/build-chatgpt-app.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.00359 |
| Opus 5 | $0.00039 | $0.00179 |
| Sonnet 5 | $0.00016 | $0.00072 |
| Haiku 4.5 | $0.00008 | $0.00036 |
Grade A, and why
build-chatgpt-app scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
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-docsfirst for current Apps SDK guidance. - If the requested app or verification flow calls the OpenAI API, use
openai-platform-api-keybefore 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-submissionwhen the user needs submission-specific review preparation.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 37 lines · 79 tokens per session scan A 4e7b2c98672a
build-chatgpt-app is a skill published in the GitHub repository openai/openai-developers-for-claude (23 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 79 tokens to every session and 359 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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