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Add Claude Code plugin with "Create MCP App" skill (#256)

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Add a Claude Code plugin (`plugins/mcp-apps/`) for distribution via the
plugin marketplace. The plugin provides the "Create MCP App" skill that
guides the agent through building MCP Apps with interactive UIs.

The skill includes:
- Instructions to clone SDK repo for reference templates
- Framework selection guidance (React, Vanilla JS, Vue, Svelte, etc.)
- Tool visibility configuration (`_meta.ui.visibility`)
- Host styling integration patterns
- Testing workflow using `basic-host`
- Common mistakes to avoid

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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Jonathan Hefner 2026-01-13 18:50:18 -06:00 • committed by GitHub
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@ -85,3 +85,7 @@ Uses npm workspaces. Examples in `examples/` are separate packages:
- `basic-server-*` - Starter templates (vanillajs, react, vue, svelte, preact, solid). Use these as the basis for new examples.
- `basic-host` - Reference host implementation
- Other examples showcase specific features (charts, 3D, video, etc.)
## Claude Code Plugin
The `plugins/mcp-apps/` directory contains a Claude Code plugin distributed via the plugin marketplace. It provides the "Create MCP App" skill (`plugins/mcp-apps/skills/create-mcp-app/SKILL.md`) that guides users through building MCP Apps with interactive UIs.