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build-mcp-app

Build interactive MCP app widgets with sandbox-safe HTML and host-mediated messaging.

Updated Apr 8, 2026
Search Tags:#mcp#claude-code#widgets#mcp-server#chat-ui#interactive-ui#apps-sdk
One-click install
npx skills add https://github.com/NGTPTE/TuriX-MarketPlace --skill build-mcp-app-ngtpte
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: build-mcp-app
Source: https://github.com/NGTPTE/TuriX-MarketPlace/tree/main/plugins/mcp-server-dev/skills/build-mcp-app
Command: npx skills add https://github.com/NGTPTE/TuriX-MarketPlace --skill build-mcp-app-ngtpte

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps you add interactive user interfaces to MCP tools when plain text responses are not enough. It solves the gap between simple server actions and richer in-chat experiences such as forms, pickers, confirmations, dashboards, and visual previews.

Core Features & Use Cases

  • Widget-enabled MCP tools: Define a tool that points to a UI resource so the host can render an inline interface beside the conversation.
  • Sandbox-safe browser widgets: Build HTML interfaces that work inside the restricted MCP iframe environment using the App runtime and host-mediated actions.
  • Practical scenarios: Use it for contact pickers, selection lists, confirmation dialogs, progress displays, charts, and other tasks where the user needs to see or choose something visually.
  • Deployment flexibility: Support both remote streamable HTTP servers and locally packaged MCP applications, depending on whether the widget drives a hosted service or a local app.

Quick Start

Use this skill to turn an existing MCP tool into an interactive widget by defining its UI resource, returning structured tool data, and serving sandbox-compatible HTML for chat rendering.

Frequently Asked Questions about build-mcp-app

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

FAQPage Schema
How do I add interactive UI widgets to an MCP server?▼

To add interactive UI widgets to an MCP server, you define a tool that points to a UI resource, return structured tool data, and serve sandbox-compatible HTML for the host to render inline beside the conversation.

When should I use interactive chat widgets instead of plain text in MCP tools?▼

You should use interactive chat widgets in MCP tools when plain text responses are insufficient for tasks requiring forms, pickers, confirmations, charts, or visual previews where users need to see or choose something visually.

How do I build sandbox-safe HTML for MCP app widgets?▼

You build sandbox-safe HTML for MCP app widgets by using the App runtime and host-mediated actions to ensure the interfaces work correctly inside the restricted MCP iframe environment within the conversation.

Can I deploy MCP app widgets on both remote servers and local applications?▼

Yes, you can deploy MCP app widgets on both remote streamable HTTP servers and locally packaged MCP applications, supporting either hosted services or local apps depending on your widget's driving context.

Do I need separate tool and resource registration for MCP widgets?▼

Yes, building MCP widgets requires separate tool and resource registration alongside the App runtime with host-mediated messaging, linking, and state updates to render the sandboxed widget inside the conversation.

What is the best way to turn an existing MCP tool into a visual widget?▼

The best way to turn an existing MCP tool into a visual widget is to define its UI resource, return structured tool data, and serve sandbox-compatible HTML for chat rendering using the App runtime.

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