modelcontextprotocol / modelcontextprotocol/ext-apps
SEP: ui/message user consent
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@idosal is already working on this.
Since Dec 1, 2025.
v1
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Description
The ui/message UI action allows apps to send messages on behalf of the user, which may be a sensitive operation.
While the ability to inject context from an MCP server already exists, this (potentially) new attack surface may warrant user consent.
Raised by @PederHP (see SEP PR) and @ochafik.
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