> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agenticenv.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# AG-UI Protocol

> Enable AG-UI event streaming for CopilotKit and other AG-UI-compatible web frontends

Agent stream events follow the [AG-UI open protocol](https://docs.ag-ui.com), making your agents natively compatible with AG-UI frontends — CopilotKit, custom React clients, and other SDKs — without extra integration work.

Events like `RUN_STARTED`, `TEXT_MESSAGE_CONTENT`, `TOOL_CALL_START`, and `REASONING_MESSAGE_CONTENT` are emitted in the correct AG-UI sequence during every [`Stream`](/getting-started/streaming) call.

## Basic integration

Enable streaming, then forward serialized events to your frontend over SSE, WebSocket, or Redis:

```go theme={null}
a, err := agent.NewAgent(
    agent.WithLLMClient(llmClient),
    agent.WithStream(true),
)

eventCh, err := a.Stream(ctx, prompt, nil)
if err != nil {
    return err
}

for ev := range eventCh {
    if ev == nil {
        continue
    }
    jsonBytes, err := ev.ToJSON()
    if err != nil {
        continue
    }
    // Forward jsonBytes to SSE/WebSocket client
    _ = jsonBytes
}
```

Call `event.ToJSON()` on any [`AgentEvent`](https://pkg.go.dev/github.com/agenticenv/agent-sdk-go/pkg/agent#AgentEvent) to get AG-UI-compatible JSON.

## Reference app

[Agent Chat](/reference-apps/agent-chat) — production-shaped split API/worker app with Postgres, SSE streaming, and CopilotKit UI.

## Example

<CardGroup cols={2}>
  <Card title="AG-UI" icon="play" href="/examples/agui">
    Go SSE server + CopilotKit UI
  </Card>
</CardGroup>

## Related

<CardGroup cols={2}>
  <Card title="Streaming" icon="wave-pulse" href="/getting-started/streaming">
    Stream API and event types
  </Card>

  <Card title="Approvals" icon="shield-check" href="/features/approvals">
    CUSTOM events and OnApproval
  </Card>

  <Card title="Sub-agents" icon="sitemap" href="/features/sub-agents">
    Event fan-in from delegated agents
  </Card>

  <Card title="Agent Chat" icon="comments" href="/reference-apps/agent-chat">
    Full-stack reference application
  </Card>
</CardGroup>