Overview

The Agent User Interaction Protocol SDK uses a streaming event-based architecture with strongly typed data structures. This package provides the foundation for connecting to agent systems.

<dependency>
  <groupId>com.ag-ui</groupId>
  <artifactId>core</artifactId>
  <version>0.0.1</version>
</dependency>

Types

Core data structures that represent the building blocks of the system:

• RunAgentInput — Input parameters for running agents
• Message — User/assistant communication and tool usage
• Context — Contextual information provided to agents
• Tool — Defines functions that agents can call
• State — Agent state management

Events

Events that power communication between agents and frontends:

• Lifecycle Events — Run and step tracking
• Text Message Events — Assistant message streaming
• Tool Call Events — Function call lifecycle
• State Management Events — Agent state updates
• Special Events — Raw and custom events