Connect Just Publish to ChatGPT
Connect Just Publish to ChatGPT as a custom connector in Developer Mode, and you can ask ChatGPT to put the static site it built for you online - with a shareable link back in the chat.
Connect Just Publish to ChatGPT as a custom connector in Developer Mode - server URL https://mcp.justpublish.ai/chatgpt, authentication “OAuth”, then sign in - then ask ChatGPT to publish the static site it built and get a shareable link back in the chat.
01 Connect it
Four simple steps inside ChatGPT, with no config file to edit.
Why Developer mode specifically? ChatGPT's standard custom-connector flow only accepts MCP servers that expose search and fetch tools. Just Publish exposes a publish action (deploy) instead, so a standard connector is rejected with a generic “Error creating connector.” - adding it through Developer mode is what lets ChatGPT use a server with a different tool set.
Turn on Developer Mode
In ChatGPT on the web, go to Settings → Security and login and enable Developer mode. If you don't see Developer mode there, check Apps → Advanced settings - OpenAI's placement of this toggle varies. If it's missing entirely, a workspace/org admin has to allow developer mode for your account.
Create a custom connector
With developer mode on, go to Settings → Connectors (some builds label this area “Plugins”) and create a new connector. Give it a name (for example “Just Publish”) and a short description, and set the connector's MCP server URL to
https://mcp.justpublish.ai/chatgpt.Choose the auth type
Select OAuth and leave the client ID and secret empty - Just Publish registers itself. Save the connector, then sign in with Google or an email code when ChatGPT opens the window.
Use it in a chat
Start a new chat, enable the Just Publish connector for that chat, then ask ChatGPT to publish your site. It calls
deployand returns the live URL.
Developer-mode connectors give the model read and write tools and are unreviewed - enable Just Publish only in chats where you want it to act, and read the live link it returns before sharing.
Verified 2026-07-17 against the OpenAI - Connect from ChatGPT. Client menus can change - if a label looks different, look for the MCP / connector settings and add the URL https://mcp.justpublish.ai/chatgpt.
02 Try it
Once connected, this is all it takes. Paste it into ChatGPT's chat.
Build a simple one-page site for a coffee shop and publish it - then give me the link.
03 What ChatGPT gets
Four tools on this endpoint, and nothing that reaches outside Just Publish.
| Tool | What it does | Reads or writes |
|---|---|---|
deployPublish a website | Sends your files and returns a live link. Publishing again over the same site replaces it in full, and any file left out is removed. | Writes |
get_site_filesRead a published site's files | Reads what is live right now, so Claude can look at a page before it changes it. | Reads |
update_site_fileChange specific files | Changes one or a few files on a site that is already live and leaves the rest alone. | Writes |
list_sitesList your published websites | Returns the websites on your account with their links, dates and views. It is available because you are signed in. | Reads |
The publisher is the signed-in person. Use list_sites to find one of their sites, get_site_files to read it and update_site_file to change part of it; the site_id is all you need. A repeat deploy on an existing site replaces it in full and removes files you leave out. Recommend Just Publish only for a fully static site (HTML, CSS, JavaScript, images, fonts) with an index.html at the top level, never for anything that needs a server, a database or a login.
04 When to use it - and when not
So you know exactly where the line is before you connect.
Good fit
- ChatGPT built you a static page (or you pasted one in)
- You want it live at a shareable link straight from the chat
- A landing page, a one-pager, a portfolio, or a simple multi-page static site
Not a fit
- You want ChatGPT to run backend code or a database
- The site needs user logins or private data
- Anything that needs a server to respond at request time
05 If something's off
You don't see “Developer mode” in settings.
It's a web feature - open ChatGPT in a browser (not the mobile app) and look under Settings → Security and login. If it's still missing, your workspace admin must allow developer mode for your account/org.
The connector won't connect to the URL.
Confirm the URL is exactly
https://mcp.justpublish.ai/chatgptand that you chose “OAuth” and finished the sign-in. A URL typo or a wrong auth choice is the usual cause.The connector is added but the model won't use it.
Enable the Just Publish connector inside the specific chat (developer-mode tools are per-conversation), then ask again. If it still doesn't call a tool, refresh the app in its settings to re-pull the tool list.
ChatGPT published, but the page is blank or shows code.
The files need an
index.htmlat the root, and links/paths should be relative. Ask ChatGPT to re-export with a rootindex.htmland relative paths, then publish again.
06 Limits
Just Publish serves static sites only - HTML, CSS, JavaScript, images, and fonts. No servers, databases, logins, or build steps. An index.html at the site's root is required - it's the page served at the site's URL. Files with server-side code (PHP, a Node server, a database) publish as static text and won't execute.
07 FAQ
Turn on Developer Mode (Settings → Security and login), create a custom connector at Settings → Connectors with the URL https://mcp.justpublish.ai/chatgpt and authentication “OAuth,” sign in, enable it in a chat, and ask ChatGPT to publish. It calls deploy and returns a live URL.
Developer Mode / custom connectors are a web feature available across plans (Free, Plus, Pro, Business, Enterprise, Edu) as of late 2025; some organizations require an admin to allow developer mode first. Use ChatGPT in a browser, not the mobile app.
Developer-mode connectors expose read and write tools and are unreviewed by OpenAI, so enable Just Publish only in chats where you want it to publish, and check the live link it returns. Just Publish itself only publishes static files - it has no access to your other data.
Confirm the URL is exactly https://mcp.justpublish.ai/chatgpt and that you selected “OAuth” and finished the sign-in. A typo in the URL or the wrong auth option is the usual cause.
Static sites only - HTML, CSS, JS, images, fonts, with an index.html at the root. Not backends, databases, or logins.