We migrated our ChatGPT App from the OpenAI Apps SDK to the MCP Apps standard, following the MCP Apps compatibility guide . The migration went fine. Tools, resources, ontoolresult, callServerTool, sendMessage, and app-only tool visibility all work correctly. However, when implementing the documented…

We could just pass the viewUUID in structuredContent, but I wonder if it’s a bug or if _meta from tool results is not meant to be used? @coreyching @OpenAI_Support

Bug Report: ChatGPT strips _meta from tool results and breaks MCP Apps viewUUID state persistence pattern

casey-chow May 1, 2026, 7:24pm 4

Bug Report: ChatGPT strips _meta from tool results and breaks MCP Apps viewUUID state persistence pattern