modelcontextprotocol / modelcontextprotocol/ext-apps
Re-usable views
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@idosal is already working on this.
Since Feb 3, 2026.
enhancement
protocol
v2
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Description
Currently, the spec assumes a new view is rendered per tool call. Hosts may decide to implement variations of their own layout (e.g., a persistent side panel), but each invocation would still create a new instance under the hood. This approach was chosen to simplify the model for the MVP (#62).
Now that the spec is stable, we can examine deferred approaches, such as referencing previously rendered instances using viewSessionId (#295).
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