Belgie lets Python developers build React MCP apps without installing Node.js

TheRealMrMatt · reddit · 2026-07-21

Belgie

Belgie is an open-source toolkit for building React-based MCP apps in Python without installing Node.js.

It bundles Deno, lets you attach React widgets to Python tools with belgie.tool(widget=...), and supports a single-project workflow instead of the usual split between a Python MCP server and a separate Node/Vite UI app.

How it works

• declare JS dependencies in pyproject.toml
• run uv add, belgie lock, belgie install
• use BelgieExtension to serve the Vite page in development
• cache the built HTML for production
• connect widgets to the MCP host via u/belgie/mcp

Examples

The repo includes minimal, shadcn, and TanStack + FastAPI examples. The author is asking how other people structure MCP apps with Python backends.

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