Summary

A readable reference client for testing servers against several models.

Its value is as a bench: point it at a few servers and a few backends and watch what a tool call actually does, with a codebase small enough to modify. The author has since started a restructured successor, TUUI, so treat this one as the compact original rather than the actively growing app.

What it is

An MCP client, not a server. An Electron desktop app built to keep the code small enough to read, so the mechanics of MCP - connecting clients, listing tools, running a tool call - stay visible rather than buried.

What you get

One app on Linux, macOS and Windows, buildable into your own packaged desktop application
Model configuration by JSON file, against any endpoint that speaks the OpenAI SDK shape and supports function calls
Several clients configured at once, each connected to a different MCP server
A UI layer that can be lifted out for web use, so desktop and browser behave the same
Apache-2.0, so you can fork it into your own product

Requirements

Node.js. Clone the repository, edit config.json in src/main so the command and args point at servers that exist on your machine, then npm install and npm start. Building a packaged app is npm run build-app. Model access needs an API key in the interface configuration file you supply.