/claim #1301

Summary

Implements MCP UI support in Archestra Chat UI, allowing tools to render interactive web UIs via the MCP Apps protocol.

Changes

• New MCPUIRenderer component (mcp-ui-renderer.tsx)

  • Implements full MCP Apps postMessage contract (intent, notify, tool, prompt, link, data, size)
  • Supports text/html, text/uri-list, and application/vnd.mcp-ui.remote-dom content types
  • Handles iframe lifecycle, blob URLs, and size updates
  • Includes security sandbox for iframe content

• Updated chat-messages.tsx

  • Integrated MCPUIRenderer into MessageTool component
  • Added extractUIResource and isMCPUIResource detection utilities
  • Tool outputs containing UIResources now render as interactive iframes

Testing

• Manual testing with MCP UI test server
• Integration with MCP Gateway (passes UIResources unchanged)
• Integration with LLM Gateway
• Test with 2 real vendor MCPs

Requirements Addressed

1. ✅ MCP UI support in Archestra Chat UI
2. 🔄 Third-party UI via MCP Gateway (UIResources pass through unchanged)
3. 🔄 Third-party UI via LLM Gateway
4. 🔄 Test with 2 vendor MCPs and add to catalog

Demo

Will provide demo video showing all four requirements once testing is complete.

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