wehub-resource-sync
60e0ffc959
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QR Code MCP App
An MCP App server that generates QR codes with an interactive viewer UI. Ported from the ext-apps QR server example to demonstrate FastMCP's MCP Apps support.
What it demonstrates
- Linking a tool to a
ui://resource viaAppConfig - Serving embedded HTML with the
@modelcontextprotocol/ext-appsJS SDK from CDN - Declaring CSP resource domains via
ResourceCSP - Returning
ImageContent(base64 PNG) from a tool
Setup
cd examples/apps/qr_server
uv sync
Usage
uv run python qr_server.py
Or install it into an MCP client:
fastmcp install stdio fastmcp.json
How it works
The server registers one tool (generate_qr) and one resource (ui://qr-server/view.html). The tool generates a QR code as a base64 PNG image. The resource serves an HTML page that uses the MCP Apps JS SDK to receive the tool result and display the image in a sandboxed iframe.
The HTML loads the ext-apps SDK from unpkg, so the resource declares csp=ResourceCSP(resource_domains=["https://unpkg.com"]) to allow the host to set the appropriate Content-Security-Policy.