Phantom.App.Preview (phantom_mcp v0.5.0)

Development preview plug for MCP App resources.

Lists registered MCP Apps and interact with them in the browser.

Usage

Mount in your router during development

Phoenix Router

if Mix.env() == :dev do
  forward "/dev/mcp-apps", Phantom.App.Preview,
    router: MyApp.MCPRouter
end

Plug Router

if Mix.env() == :dev do
  forward "/dev/mcp-apps",
    to: Phantom.App.Preview,
    init_opts: [router: MyApp.MCPRouter]
end

Then visit /mcp-apps to see a list of registered apps, and click one to render it in a sandboxed iframe that simulates how MCP hosts display apps.