modelcontextprotocol / modelcontextprotocol/ext-apps

Standardizing Host CSS Variables

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#382 2 comments 0 reactions 1 assignee View on GitHub

@liady is already working on this.

Since Jan 28, 2026.

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Description

Hey team,
Wanted to understand the future of CSS variables https://github.com/modelcontextprotocol/ext-apps/blob/main/src/spec.types.ts better. Given that there aren't a lot of globally agreed upon conventions for these variables (names & intent) - do you see them stabilising in the future across different hosts or should app builders consider all of them as optional and handle it accordingly?

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