novuhq/novu
Novu is an open-source communication infrastructure that unifies notification delivery across various channels for both products and AI agents, offering a single API for multi-channel messaging, wo...
Awesome AI Agents › Communication Protocols
a2ui-project/a2ui
A2UI (Agent-to-User Interface) is an open-source protocol and set of client libraries that lets an AI agent "speak UI" without sending executable code. Instead of generating HTML/JS directly, the agent emits a declarative JSON payload describing the intended UI tree -- components and a bound data model -- drawn only from a catalog of components the client application has pre-approved (Card, Button, TextField, and so on). The client's A2UI renderer maps that abstract description onto its own native widgets, so the same payload can render as Flutter widgets, Angular, Lit or React web components, or SwiftUI/Jetpack Compose views, making agent-generated interfaces safe even when the agent is remote or on the other side of a trust boundary. The format is designed to be easy for an LLM to generate incrementally: a flat list of ID-referenced components supports progressive rendering and incremental updates as a conversation continues, rather than regenerating a whole UI each turn. An open registry pattern lets developers map server-side component types to custom client implementations, including sandboxed iframes for legacy content, keeping security decisions in the developer's hands. A2UI composes with transport protocols such as A2A and AG-UI and can be produced by any model capable of emitting JSON. Typical use cases include dynamic data-collection forms generated for a specific conversation, a remote specialized sub-agent returning a UI to render inside a host chat window, and enterprise agents building approval dashboards or charts on the fly. The project ships renderers and SDKs for several frameworks, a visual composer and a theater demo for stepping through example payloads, and is written primarily in TypeScript and Dart.
https://github.com/a2ui-project/a2ui
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