Not able to add ChatGPT App/MCP Server to ChatGPT

ChatGPT Apps SDK
,
1

I am developing a ChatGPT App using the ChatGPT Apps SDK. I previously added my MCP server without issues, but I can no longer add it.

When attempting to add the MCP server, no error message appears. On the server side, I can see requests coming from OpenAI:

POST /mcp → 200 OK
POST /mcp → 200 OK
POST /mcp → 202 Accepted
POST /mcp → 200 OK
POST /mcp → 200 OK
GET /.well-known/openid-configuration → 404
GET /.well-known/oauth-authorization-server → 404
GET /mcp/.well-known/openid-configuration → 404
GET /.well-known/openid-configuration/mcp → 404
GET /.well-known/oauth-authorization-server/mcp → 404
GET /.well-known/oauth-protected-resource → 404
GET /.well-known/oauth-protected-resource/mcp → 404
GET / → 404

After these requests, the interface returns to the Apps & Connectors menu, and my app does not appear. I also cannot use the “+” button to add the app/MCP server to a chat.

I tested the same MCP server using a ChatGPT Business account, and it successfully adds. However, the Business account cannot render widgets, so I cannot continue development.

This issue is blocking my development. Any guidance or fixes would be appreciated.

Thank you.
Jake

6 Likes
2

Plus 1 - these kind of issues are cropping up overnight repeatedly

1 Like
3

Same - all my previous connectors have dissapeared and unable to create any new connectors

4

Any solutions to this? I’m having the problem now.

5

Same thing, and no way to debug.

6

Hi everyone! Sorry we missed this. Are you all still blocked here?

1 Like
7

same problem in free versions of chatgpt but no problem in plus version.
in free version after saving the mcp connector nothing happens, and we can see the request with 200 response in our server log

9

Team can someone take a look, new apps are not showing up

10

Yes, we are still blocked. I can’t add an MCP server. I’m using a free account.

After I add the MCP server, it says it’s “now connected” but it still doesn’t show up on that page.

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1 Like
11

Thank you all for the reports!

It looks like it’s currently expected (and intentional) that workspace-published MCPs don’t show up in search, though they should show up in the App view. Confirming that you don’t see your app when you go to https://chatgpt.com/apps and try visually finding it (not using search)?

1 Like
12

Yes.
Same error today, free account.
I cannot see my app either here: /apps#settings/Connectors or here /apps

13

Same here. It says “now connected”, but the MCP server doesn’t show up in the list and not under /apps either.

The provided tools also raren’t used in prompts.

14

It appears that in order to test your app you need to be in ChatGPT Developer Mode. And for ChatGPT Developer mode, you need a Pro, Plus, Business, Enterprise or Education account.

https://platform.openai.com/docs/guides/developer-mode#how-to-use

15

So, the problem still exists and is not resolved.

I am in developer mode, with a free account, yes, this seems to be possible. I can connect to my MCP app sucessfully with the oAuth flow. And I get a success notification in ChatGPT. But it does not appear in the chat nor in the apps list. Nowhere.

@OpenAI_Support Can you confirm that you still working on this? It is really hard (actually impossible) to develop an App for ChatGPT this way. It works flawlessly with Claude and Mistral..

1 Like
17

@OpenAI_Support I couldnt able to add mcp server to chatgpt , i was able to add the mcp server feb 4 , but now same implentation from my side, gpt is saying

any udpates happened in the chatgpt side?

Error: MCP server url does not implement OAuth

18

Same here! I was able to connect tour MCP server 2 or 3 days ago. I removed it for testing purposes and now if I want to connect it again I am getting Error: MCP server url does not implement OAuthand nothing else. Our server has oAuth 2.1 implement and I can see in the server log that chatgpt is sucessfully fetching from the .well-known endpoint!

19

@OpenAI_Support Please Help us with Query we are getting the Error: MCP server url does not implement OAuth, But i have checked log , the .well-known endpoint is able to fetch by chatgpt, what is the issue?

20

The issue still persists for both free and pro accounts as described by @AldiPower

It would be better to at least find some debugging information, why the app is not connected or not listed. The dx is terrible right now.

21

Hi! In case this is related, Pro/Plus (individual) accounts must enable Developer Mode in their ChatGPT settings to create or install MCP connectors.

Once you’ve enabled Developer Mode you’ll regain the ability to add and test custom MCP connectors. If you still don’t see it after enabling Developer Mode, check that you’re in the correct plan and reach out to us at support@openai.com.

1 Like