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ra-mcp-apps

Guide development and debugging of MCP Apps with FastMCP and Svelte.

Updated Feb 2, 2026
Search Tags:#security#svelte#ui development#interactive apps#fastmcp#mcp apps
One-click install
npx skills add https://github.com/Borg93/mcp-apps-viewer --skill ra-mcp-apps-borg93
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ra-mcp-apps
Source: https://github.com/Borg93/mcp-apps-viewer/tree/main/.claude/skills/ra-mcp-apps
Command: npx skills add https://github.com/Borg93/mcp-apps-viewer --skill ra-mcp-apps-borg93

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides comprehensive guidance and architectural patterns for developing interactive user interfaces within the MCP (Model Context Protocol) framework, enabling rich application experiences directly within chat environments.

Core Features & Use Cases

  • Architecture Guidance: Understand the roles of Server, Host, and View in MCP Apps.
  • Development Patterns: Learn how to handle data flow, tool visibility, security (CSP, sandboxing), and communication protocols.
  • Use Case: Develop a real-time data visualization dashboard that appears directly in a chat interface, allowing users to interact with charts and data without leaving the conversation.

Quick Start

Use the ra-mcp-apps skill to understand how to set up a FastMCP server for an interactive UI.

Frequently Asked Questions about ra-mcp-apps

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build interactive UIs within MCP hosts like Claude or ChatGPT?▼

To build interactive MCP Apps, you set up a FastMCP server to serve a Svelte frontend, which is then rendered directly within chat environments. This architecture allows users to interact with rich UI components without leaving the conversation.

How does data flow work when developing MCP Apps?▼

Data flow in MCP Apps is handled through content and structuredContent patterns. The Skill guides you through routing data between the FastMCP server, the MCP host, and the Svelte frontend to ensure proper rendering and state synchronization.

What security policies do I need to configure for MCP Apps?▼

MCP Apps require strict Content Security Policy (CSP) and sandboxing configurations. The Skill provides architectural patterns to enforce these security measures, ensuring interactive UIs rendered within chat hosts remain isolated and secure.

Can I use Svelte for frontend architecture in MCP Apps?▼

Yes, Svelte is used for the frontend architecture in MCP Apps. The Skill covers how to structure Svelte components and manage inter-component communication via postMessage to create interactive user interfaces within the MCP framework.

Why do I need to use postMessage for inter-component communication in MCP Apps?▼

postMessage is required for inter-component communication because MCP Apps run inside sandboxed environments within chat hosts. This protocol allows the Svelte frontend to securely exchange messages and trigger actions with the FastMCP server.

How do I set up a FastMCP server for an interactive UI dashboard?▼

You can set up a FastMCP server for an interactive UI by following the Skill's quick start guidance. It covers configuring tool visibility and establishing the server-host-view architecture needed to render real-time data visualizations directly in chat.

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