MCP App Spec Update #1135

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khandrew1 wants to merge 1 commit into main from khandrew1/mcp-app-spec-update

+3 −3

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khandrew1 commented Jan 3, 2026 •

edited

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Changed sandbox-ready to sandbox-proxy-ready
Prefers border was implemented in Add prefersBorder in MCP apps #1137
ui/tool-cancelled needs to be implemented
width needs to be implemented
ui/notifications/tool-input-partial needs to be implemented (?)
ui/resource-teardown needs to be implemented
missing styles in host context though this is optional.
MIME type should be strict


          chore: change sandbox-ready to sandbox-proxy-ready

5f97574

khandrew1 self-assigned this

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matteo8p commented Jan 3, 2026 •

edited

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@khandrew1 Looking at this old PR, I actually think prefersBorder belongs to MCP Apps, not ChatGPT apps. See the official MCP apps spec.

EDIT: Oops, I found openai/widgetPrefersBorder. Also does exist in ChatGPT apps.

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