Published ChatGPT App widget fails with Failed to fetch template / ecosystem/widget 404 — ongoing since late May

Case Number: 09279117

I found what appears to be the root cause, and it confirms this is a backend ingestion / widget snapshot issue on OpenAI’s side rather than an issue with our MCP server.

First, to clarify your earlier questions:

The failure was observed on ChatGPT web/desktop as well, not only on mobile. I understand that interactive MCP apps may not be supported on mobile, but this issue is not limited to mobile behavior.

Also, I have not re-published the app yet because the app is already Published and visible in the directory, and I do not want to risk losing the app’s Published status. If refreshing or re-publishing from my side is safe and will not affect the Published status, please confirm and I can do it immediately.

I exported and compared the configs of our Published version and our older Rejected version. The widget template’s sediment_id — OpenAI’s stored snapshot of the widget HTML — is empty in the Published version:

PUBLISHED / live version:

• App version ID: asdk_app_v_69c5fe38431081918f0af247e22e648b

• Status: Published / Released

• Template resource URI: ui://widget/kfortune-20260510-7.html

• sediment_id: ""

REJECTED / older version:

• App version ID: asdk_app_v_69b0d7fc8de48191a38b8a34bb518125

• Status: Rejected

• Template resource URI: ui://widget/index.html

• sediment_id: "file_00000000709471f59e9aef7156ea74cd"

Because the Published version’s sediment_id is empty, OpenAI’s backend appears to have no stored copy of the widget template for the live version. This fully explains the symptoms:

• ChatGPT’s frontend requests the widget from:

[https://chatgpt.com/backend-api/ecosystem/widget?...&template_pointer=ui://widget/kfortune-20260510-7.html](https://chatgpt.com/backend-api/ecosystem/widget?...&template_pointer=ui://widget/kfortune-20260510-7.html)

and receives 404 Not Found.

• No resources/read request ever reaches our /mcp server, because the widget lookup fails before it gets that far.

• Our MCP server is healthy. The open_kfortune_ui tool call reaches our /mcp endpoint and returns HTTP 200 with the correct template pointer.

• Our resources/read handler returns HTTP 200 and the template HTML for any ui://widget/kfortune-*.html URI, but the request never reaches us.

Could you please re-ingest / re-snapshot the widget template for the Published version so its sediment_id is populated?

Important: I would prefer not to re-publish the app myself unless you confirm it is safe, because I do not want to risk losing the app’s Published status. If a refresh or re-publish on our side is required to trigger the ingestion, please confirm that doing so will preserve the Published status, and I will do it immediately.

Attachments for reference:

• “Your Apps” screenshot confirming the app is Published, version 1.0.0, with “View in Directory”, alongside the older Rejected 1.0.0 version.

• The two exported configs, Published and Rejected, showing the sediment_id difference.

• Server-side log excerpt showing open_kfortune_ui -> HTTP 200.

• Affected ChatGPT session transcript and “Failed to fetch template” screenshots, sent earlier.