When using the MCP Apps SDK (@modelcontextprotocol/ext-apps), the ontoolresult notification is only fired once when the tool initially completes. If the user refreshes the page, the iframe reloads and reconnects to the host, but the host never re-sends the last tool-result notification. Th…

Hey everyone, Thanks for raising this. I reviewed the behavior and this looks like expected SDK/host behavior, not a platform bug. ontoolresult is emitted as part of the tool execution flow. After a page refresh/iframe reconnect, the host does not guarantee replay of the last prior tool-result even…

Bug Report: `ontoolresult` not re-sent to MCP App after page refresh

ChatGPT Apps SDK

nico9 March 10, 2026, 12:52pm 2

Is this a bug or is it meant to be this way? @coreyching @OpenAI_Support

Widgets not rendering (New this week)

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Bug Report: `ontoolresult` not re-sent to MCP App after page refresh

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