Individual skill
single-file-bundling
Configure Vite with vite-plugin-singlefile for mandatory single-file HTML bundling of MCP Apps. All assets (JS, CSS, images, fonts) must be inlined into a single HTML file for sandboxed iframe compatibility.
library/specializations/ai-agents-conversational/skills/single-file-bundling/SKILL.md
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# single-file-bundling
Configure Vite with vite-plugin-singlefile to produce a single self-contained HTML file for MCP Apps running in sandboxed iframes.
## Overview
MCP Apps run in sandboxed iframes with no same-origin server. This means:
- **No relative asset URLs** -- `<script src="./main.js">` will not resolve
- **No CSS file imports** -- `<link href="./styles.css">` will not load
- **No image/font paths** -- relative paths to assets will fail
- The **entire UI must be a single HTML file** with all JS, CSS, images, and fonts inlined
`vite-plugin-singlefile` handles this by inlining all assets into one HTML file during the Vite build. This is **mandatory** for MCP Apps -- without it, the app will show a blank iframe.
