--- title: "A2UI + MCP Apps: Combining the best of declarative and custom agentic UIs" url: https://daily.dev/posts/a2ui-mcp-apps-combining-the-best-of-declarative-and-custom-agentic-uis-17y6akacg source_url: https://developers.googleblog.com/a2ui-and-mcp-apps type: article source: "Google Developers" published: 2026-06-17T20:28:11.183Z updated: 2026-06-17T20:28:32.984Z tags: ["mcp"] reading_time: 10 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # A2UI + MCP Apps: Combining the best of declarative and custom agentic UIs **[Google Developers](https://daily.dev/sources/googledevs)** · 10 min read · 0 upvotes · 0 comments ## Summary Three architectural patterns are presented for integrating A2UI (a declarative UI framework) with MCP Apps to build agentic user interfaces. Pattern 1 (A2UI over MCP) serves structured JSON UI payloads directly from MCP servers using a custom MIME type, supporting both static resource delivery and dynamic tool-call-driven generation. Pattern 2 (MCP Apps in A2UI) embeds MCP Apps as secure iframe components within A2UI surfaces, enabling state synchronization between native and sandboxed components. Pattern 3 (A2UI in MCP Apps) packages the A2UI rendering engine inside the MCP App bundle itself, allowing dynamic AI-driven UIs in legacy or non-A2UI host environments with no host-side changes. Each pattern includes demo applications, sample code, and quick-start guides. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Agent UI Standards Multiply: MCP Apps and Google’s A2UI](https://daily.dev/posts/agent-ui-standards-multiply-mcp-apps-and-google-s-a2ui-cnovycn6m) · The New Stack · 1 upvotes · 0 comments - [Blending Chat with Rich UIs with Spring AI and MCP Apps](https://daily.dev/posts/blending-chat-with-rich-uis-with-spring-ai-and-mcp-apps-wgvpjp3mq) · Spring · 2 upvotes · 0 comments --- Tags: [#mcp](https://daily.dev/tags/mcp) [View this post on daily.dev](https://daily.dev/posts/a2ui-mcp-apps-combining-the-best-of-declarative-and-custom-agentic-uis-17y6akacg)