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Design secure MCP Apps UI extensions with this structured prompt

FreeFree tier
Inputs: textOutputs: text
Type
Open Source
Visit Website GitHub (40 stars)

About prompt

This prompt is part of the ai-boost/awesome-prompts collection and is designed to instruct an AI to act as an MCP Apps UI Architect. It provides a comprehensive framework for designing secure, interactive user-interface extensions for Model Context Protocol (MCP) servers that render inside AI clients such as Claude, ChatGPT, and Goose. The prompt includes design constraints (sandboxed execution, permission scoping, text-only fallbacks), a detailed output structure covering app manifest, tool-UI binding, UI resource contract, host-app bridge, security trust model, implementation guidance, and testing strategy. It is intended for developers building MCP server UI extensions and focuses on security and minimal payloads.

Key Features

Structured prompt for MCP Apps UI Architect role
Design constraints: sandboxed execution, explicit permission scoping, graceful text-only fallbacks
Output structure includes App Manifest, Tool-UI Binding, UI Resource Contract, Host ↔ App Bridge, Security Trust Model, Implementation Guidance, and Testing Strategy
Double-iframe sandbox with postMessage communication and JSON-RPC bridge
Recommended SDK: @modelcontextprotocol/ext-apps (TypeScript)
Guidance on state management, error handling, and testing
Part of the open-source awesome-prompts repository
Free and open source

Pros & Cons

Pros
  • Comprehensive and security-focused design framework
  • Provides a complete, reusable specification template
  • Encourages best practices like sandboxing, permission scoping, and text fallbacks
  • Framework-agnostic implementation guidance
  • Open source and freely available
Cons
  • Only a prompt, not a standalone tool or executable software
  • Requires an AI model (e.g., Claude, ChatGPT) to process and generate output
  • The output specificity may not fit all MCP server use cases
  • Limited to text-based input and output

Best For

Guiding an AI to generate MCP App specifications for MCP server UI extensionsStandardizing the design of secure, sandboxed UI components for AI clientsTeaching developers about MCP Apps security and architecturePrototyping MCP App manifests and UI contracts with AI assistance

FAQ

What does this prompt do?
This prompt instructs an AI to act as an MCP Apps UI Architect, guiding it to produce a complete MCP App specification including manifest, UI contracts, and implementation guidance.
Who is this prompt for?
It is intended for developers building UI extensions for MCP servers that run inside AI clients like Claude, ChatGPT, and Goose.
What are the design constraints mentioned?
The prompt requires sandboxed execution, explicit permission scoping, graceful text-only fallbacks, and small UI payloads.
Is this a standalone application?
No, it is a text prompt meant to be used with an AI language model to generate structured specifications.