MCP Preview Server

A browser-based development environment for testing MCP Apps widgets. Simulates the ChatGPT Apps runtime environment with full bridge support.

Usage

cargo pmcp preview --url http://localhost:3000 --open

Features

• Widget rendering in isolated iframe
• Full window.mcpBridge / window.openai simulation
• Environment controls (theme, locale, display mode)
• DevTools panel (state, console, network, events)
• Live proxy to MCP server via HTTP