Module a2ui 

A2UI — Agent-to-UI protocol support for UAR.

A2UI allows agents to declare UI surfaces in their UAR-AGENT-MD spec (§06) and emit interactive artifacts during a run. The system resolves a2ui_schema_id values from this registry, emits agui.artifact_input_request SSE events to the browser, renders the appropriate form/confirm/select widget, and routes the user’s response back to the paused agent run as a tool result.

Key types

• schema::ArtifactSchema — definition of one A2UI surface type
• registry::A2uiRegistry — in-memory store of all registered schemas
• routes — REST endpoints for schema listing and user response ingestion

Modules

design_systems

A2UI design-system bridge — component catalog, design-token import, and semantic-search embeddings for A2UI surfaces.

presentation_selection

Client rendering negotiation is an output restriction, never resource authority.

presentations

Reusable, owner-scoped Presentation templates and safe surface instantiation.

realtime

A2UI live-update backbone (Change 20, a2ui-realtime-backbone-from-flint-realtime-fabric).

registry

A2UI schema registry — in-memory store of all registered artifact schemas.

routes

A2UI REST routes.

schema

A2UI artifact schema definitions.