CreateAgent vs CreateReactAgent

LangGraphGo provides two ways to build prebuilt agents: CreateAgent and CreateReactAgent. While both create ReAct-based agents, they differ in flexibility and configuration options.

1. CreateReactAgent

Introduction

CreateReactAgent is the most basic builder. It is designed to quickly start a ReAct Agent with minimal configuration.

Features

• Simple to use: Only requires LLM model and tool list.
• Zero configuration: Does not support custom system prompts or state modification logic.
• Rapid prototyping: Suitable for testing tools or building simple demos.

Code Example

// Only requires model and tools
agent, err := prebuilt.CreateReactAgent(model, tools)

2. CreateAgent

Introduction

CreateAgent is a more advanced and flexible builder. It uses the Option pattern common in Go, allowing fine-grained control over Agent behavior.

Configuration Options

• WithSystemMessage(string): Set the System Prompt to define the Agent's role and guidelines.
• WithStateModifier(func): Allows custom modification of message history before sending to the model (e.g., filtering out old history or adding specific context).
• WithCheckpointer(CheckpointStore): Set a checkpointer to enable state persistence and memory.

Use Cases

• Production applications.
• Scenarios requiring specific roles (e.g., "You are a helpful assistant...").
• Scenarios requiring management of long conversation history or persistent state.

Code Example

// Configure using Option pattern
agent, err := prebuilt.CreateAgent(
    model, 
    tools,
    prebuilt.WithSystemMessage("You are a professional Golang programming assistant."),
    prebuilt.WithCheckpointer(checkpointer),
)

3. Comparison Summary