Implementing MCP UI apps

MCP UI apps are interactive React visualizations that render alongside tool results in MCP clients (e.g. Claude Desktop). They're built with the Mosaic component library and served via Cloudflare Workers Static Assets.

Full reference: services/mcp/CONTRIBUTING.md.

Quick workflow

# 1. Create view components in your product's mcp/apps/ directory
#    (see "View components" below)

# 2. Add ui_apps entries to your product's mcp/tools.yaml
#    (see "YAML configuration" below)

# 3. Link tools to apps with ui_app: <key> in the tools section