MCP App Testbench

Name: MCP App Testbench
Availability: InStock
Author: khandrew1

Supports UI

by khandrew1

Comprehensive test suite and workbench for developing and validating MCP Apps with React UIs.

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Works in:claude

Exposes:ToolsResources

View on GitHub

What it does

MCP App Testbench provides a sandbox environment for developers to build and test MCP Apps. It renders interactive React UIs linked to MCP tools, allowing developers to validate tool registration, UI resource loading, and app-to-host communication APIs.

Key features

Tool-to-UI linking: Validates the rendering of HTML resources when tools are invoked.
API Testing: Exercises callServerTool, sendMessage, and sendLog functions.
Permissions Testing: Dedicated views to verify MCP app permission boundaries.
Multi-tool support: Tests complex interactions involving multiple tools and UI components.

Installation

This is a development testbench. To run it locally:

Clone the repo
Run npm install
Run npm run dev

To integrate the server part into Claude Desktop:

{
  "mcpServers": {
    "mcp-app-testbench": {
      "command": "bun",
      "args": ["server.ts"],
      "cwd": "/path/to/mcp-app-testbench"
    }
  }
}

Supported hosts

Claude Desktop

Quick install

npm install

Information

Pricing: free
Published: 4/25/2026
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Related Apps

Choose your AI client and follow the steps below.

Claude Desktop

{
  "mcpServers": {
    "mcp-app-testbench": {
      "command": "bun",
      "args": ["server.ts"],
      "cwd": "/path/to/mcp-app-testbench"
    }
  }
}