Individual skill
mcp-host-styling-integration
Integrates MCP App UI with host theming system. Applies host CSS variables, handles onhostcontextchanged, safe area insets, display mode detection, and fullscreen configuration.
library/specializations/ai-agents-conversational/skills/mcp-host-styling-integration/SKILL.md
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- Last checked
- Nov 9, 2026
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- Repository last updated
- Nov 1, 2026
- License
- MIT
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# mcp-host-styling-integration
Integrate MCP App UIs with the host application's theming system so apps look native in Claude Desktop, ChatGPT, VS Code, Goose, Postman, and other MCP-enabled hosts.
## Overview
MCP Apps render in sandboxed iframes inside host applications. Each host has its own visual theme (colors, fonts, border radii, spacing). The MCP Apps SDK provides:
- **CSS variables** (`--color-*`, `--font-*`, `--border-radius-*`) injected by the host
- **SDK helpers** (`applyDocumentTheme`, `applyHostStyleVariables`, `applyHostFonts`) to apply them
- **React hooks** (`useHostStyles`, `useHostStyleVariables`, `useHostFonts`) for React apps
- **`onhostcontextchanged` event** fired when theme changes (e.g., dark mode toggle)
The key principle is: always use CSS variable fallbacks so the app looks correct both as an MCP App (host provides variables) and standalone (fallback values apply).
