---
title: "Overview"
description: "Core concepts in the Agent User Interaction Protocol Go SDK"
---

# Package Import

```go

```

## Types Overview

The core package provides the fundamental types and interfaces that power the AG-UI protocol in Go. These types represent the building blocks for agent-to-frontend communication through a strongly typed, event-driven architecture.

Key types include:

- **Event Interface** - The base interface implemented by all AG-UI events
- **BaseEvent** - Common fields shared across all event types
- **Event Type Constants** - Strongly typed event identifiers
- **Validation Methods** - Built-in event validation

## Events Overview

The events package (`core/events`) forms the foundation of the SDK, providing a comprehensive event-driven system for real-time communication between agents and frontends. The architecture is built around Server-Sent Events (SSE) for efficient streaming.

The event system includes:

- **Text Message Events** - Streaming assistant responses with start, content, and end markers
- **Tool Call Events** - Function execution lifecycle from invocation through result
- **Run Lifecycle Events** - Tracking agent execution states and errors
- **State Management Events** - Synchronizing agent state with snapshots and deltas
- **Thinking Events** - Supporting reasoning phases with dedicated event streams

All events implement the common `Event` interface, enabling consistent handling patterns while maintaining type safety through Go's type system.

## Navigation Cards

<Card
  title="Events Reference"
  icon="cube"
  href="/sdk/go/core/events"
  color="#3B82F6"
  iconType="solid"
>
  Complete documentation of all events in the core/events package
</Card>

<Card
  title="Types Reference"
  icon="cube"
  href="/sdk/go/core/types"
  color="#3B82F6"
  iconType="solid"
>
  Complete documentation of all types in the core package
</Card>
