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ChatGPT Developer Mode MCP Apps
by OpenAI
Developer Mode lets ChatGPT connect to any Model Context Protocol server as a first-class MCP client with support for both read and write tools. You register a server by its URL, and ChatGPT can then call its tools to take action in your systems — effectively turning ChatGPT into a programmable automation hub for internal APIs and third-party services.
Works with
Custom GPTs, Actions, MCP connectors, and Apps.
When to use it
- You already run (or want to build) an MCP server and want ChatGPT to drive it
- You need ChatGPT to take write actions in an internal system, not just read
- You're prototyping a ChatGPT app against a live backend
When not to
- Non-technical, casual use — Developer Mode carries real risk from write-enabled tools
- Untrusted MCP servers — full write access magnifies prompt-injection and data-exfiltration risk
What it does
- Connect ChatGPT to any MCP server by URL
- Use both read and write tools (full MCP client support, not read-only)
- Test and iterate on MCP-powered apps before publishing them
- Reuse the same MCP servers that work with Claude, Cursor, and other hosts
How to install
Setup steps with copy-paste config. Sources are cited under each method.
Enable Developer Mode and add a server
ChatGPTRequires: An eligible ChatGPT plan with Developer Mode available · A reachable MCP server URL
Turn on Developer Mode
In ChatGPT, open Settings, then enable Developer mode (a beta feature).
Add your MCP app
From the apps/connectors settings, choose to create a developer-mode app and paste your MCP server URL, then authorize it.
urlhttps://your-server.example.com/mcpReview the tools it exposes
Inspect the read and write tools the server advertises before you let ChatGPT call them — write tools can change real data.
- Developer mode and MCP apps in ChatGPT — documentation · OpenAI · Documentation · accessed 2026-07-24
- Building MCP servers for ChatGPT — documentation · OpenAI · Documentation · accessed 2026-07-24
How to prompt it
Copy-paste prompts written to exercise this plugin, with what to expect.
Act on an internal system
Your MCP server exposes a ticketing tool.
Using the connected tools, find open tickets tagged 'billing', summarize them, and create a follow-up ticket for the oldest one. Show me the plan before creating anything.
What to expect: ChatGPT calls the MCP read tools to list and summarize tickets, then proposes the write action for your approval before executing it.
- Ask for a dry run first; only approve write actions once you've reviewed the plan.
Tips for getting the most out of it
- Only connect MCP servers you trust — write-capable tools can be abused by injected instructions in fetched content.
- Scope server credentials to the minimum the task needs; ChatGPT can only do what the server's tools allow.
- The same MCP server is portable — test it once and reuse it in Claude, Cursor, or Cline.
Prompts to pair with it
Real prompts from the IterPrompt library you can copy or run.
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Frequently asked questions
Is Developer Mode read-only?+
No — it provides full MCP client support for both read and write tools. That power is exactly why OpenAI documents it as a beta feature with security caveats.
Did OpenAI rename connectors?+
The product terminology has shifted toward 'apps' for these MCP integrations. Existing functionality remains; check the current help center for the latest naming.
Pairs well with
Related guides
Alternatives to ChatGPT Developer Mode MCP Apps
Sources & verification
The facts on this page and where they come from. Anything unverified is labeled — we'd rather say "unknown" than guess.
- Developer mode and MCP apps in ChatGPT — official page · OpenAI · Help center · accessed 2026-07-24
Install steps, pricing, and availability change often. Always confirm on the official page before relying on setup details.