Events and streaming

Use server-sent events (SSE) to follow agent output and replay persisted events. WebSocket notifications signal that related resources changed; they do not carry the same token stream.

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Live transport

Conversation streams return text/event-stream for AG-UI execution. Clients render text, tool calls, tool results, reasoning, and terminal state while the run is active.

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Durable event log

The durable mirror converts stream chunks into persisted run events. Later reads can replay the event log or continue following a run. Veryfront uses the AG-UI events specification for streamed agent output.

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SSE run stream

The durable run stream returns text/event-stream from the persisted event log. Reconnect with Last-Event-ID to continue after a received event. The stream emits heartbeats while following work and closes after a terminal run event.

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AG-UI event reference

The public stream forwards these AG-UI event types.

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Custom event names

CUSTOM events use a constrained public name set.

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WebSocket notification events

WebSocket notifications are lightweight invalidation events. They do not carry AG-UI token deltas. Clients use project event notifications to refresh child-run and message data.