modelcontextprotocol / modelcontextprotocol/ext-apps

SEP: ui/message user consent

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#60 1 comment 0 reactions 1 assignee View on GitHub

@idosal is already working on this.

Since Dec 1, 2025.

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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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