modelcontextprotocol / modelcontextprotocol/ext-apps
Sandbox origin-based state
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@idosal is already working on this.
Since Jan 27, 2026.
enhancement
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Description
Current test environments often use a static sandbox origin which might create assumptions around localStorage and other origin-based forms of state.
Should the spec make some kind of statement on persistence and/or state leaks between different apps?
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