A2UI Atomic Catalog — Webhooks & Event Delivery

Developer & Agent Documentation

Event delivery, webhook integration, and streaming documentation for the A2UI Atomic Catalog.

Event Delivery Architecture

A2UI uses modern streaming and push transports designed for AI agents and chat surfaces:

• MCP Streamable HTTP / JSON-RPC — live streaming tool invocations over /mcp
• Server-Sent Events (SSE) — live incremental streaming on /ask (pass Accept: text/event-stream)
• Google Chat Webhooks — server-side rendering of cardsV2 messages directly posted to incoming webhook URLs

Developer Resources

• API Documentation — endpoint schemas and transport contracts
• OpenAPI 3.1 Specification — machine-readable spec
• MCP Server Endpoint — live streamable JSON-RPC 2.0 interface
• Developers Guide — deployment and integration guides