I’m migrating a ChatGPT app UI from the OpenAI bridge (window.openai) to the MCP Apps bridge (ui/* over postMessage). In the OpenAI bridge, we relied on window.openai.toolResponseMetadata for UI-only data and it worked. After moving to MCP Apps, we expect the same data to be available as top-level…

Hello, this bug has been fixed now and visible in last changelog. Confirmed that its working on my side

This is still happening, what workaround did you use?

As a workaround you can read the metadata from the window.openai.toolResponseMetadata when receiving the even ui/notifications/tool-result But we have seen an issue here : when we receive the notification, the metadata are sometimes not available in window.openai.toolResponseMetadata This is a bug…

Cross-posting here: [image] MCP Apps in ChatGPT are fundamentally broken - 2 critical bugs ChatGPT Apps SDK Hey all, sorry this took so long–to be frank, it took me a bit of time personally to understand why this was an issue (I spend more time on the top-leve…

MCP Apps: ui/notifications/tool-result missing _meta in ChatGPT

ChatGPT Apps SDK

casey-chow May 1, 2026, 7:25pm 4

Cross-posting here:

If it doesn’t work for you by mid-next week please post again!

Topic		Replies	Views
ChatGPT MCP Apps bridge drops custom _meta from tool results in ui/notifications/tool-result ChatGPT Apps SDK	6	425	May 2, 2026
MCP Apps in ChatGPT are fundamentally broken - 2 critical bugs ChatGPT Apps SDK bug , mcp , apps-sdk	22	1603	May 28, 2026
Bug Report: ChatGPT strips _meta from tool results and breaks MCP Apps viewUUID state persistence pattern ChatGPT Apps SDK chatgpt , bug , apps-sdk , chatgpt-apps	2	248	May 1, 2026
Chat GPT App - not reading the mcp tool's metadata anymore ChatGPT Apps SDK chatgpt-app , apps-sdk	7	1575	December 2, 2025
ChatGPT toolOutput spec mismatch in MCP and Apps SDK Bugs chatgpt	1	162	October 12, 2025

MCP Apps: ui/notifications/tool-result missing _meta in ChatGPT

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